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  • Biology  (6,737)
  • Aquaculture  (3,517)
  • 2020-2022  (9,483)
  • 1
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    Ex-ante impact evaluation: case studies from Malawi, Bangladesh and Ghana (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/10990 | 115 | 2013-03-18 12:53:47 | 10990 | WorldFish Center
    Details
    Publication Date: 2021-06-25
    Description: This document presents ex-ante impact evaluations of research for development projects related to aquaculture in Bangladesh, Malawi and Ghana. The Ghana chapter also includes an ex-ante evaluation of a fisheries project. The case studies utilized preliminary versions of guidelines developed specifically for ex-ante evaluations of aquaculture and fisheries projects. The guidelines, found in A Practical Guide for Ex-Ante Impact Evaluations in Fisheries and Aquaculture, are designed to provide an approach for a qualitative examination of the potential for a project to deliver impacts. Using a conceptual framework based on the outcome focus of results-based management, the guidelines stress careful examination of the setting, internal consistency, a sound theory of change, and an examination of stakeholders’ interests and potential partnerships. The case study reports illustrate the variability with which the guidelines may be interpreted and applied. The different teams, operating with limited time and budget that constrained the collection of new data, were forced to utilize existing secondary data and information and consult with key stakeholders to complete their analyses. The varying levels of reporting reflect the differences among the cases in the amounts of existing information and variety of stakeholders potentially involved in the projects being examined.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Aquaculture ; Aquaculture ; Impact assessment ; Malawi ; Bangladesh ; Ghana
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Ictiólogos de la Argentina: Alberto Espinach Ros (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11019 | 196 | 2013-03-18 20:05:12 | 11019 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina.The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible,personal pictures and additional material.The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions.This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances.I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: LÓPEZ, H. L.; G. FABIANO; S. B. SVERLIJ; A. DOMÁNICO; C. FUENTES & J. PONTE GÓMEZ. 2012. Ictiólogos de la Argentina: Alberto Espinach Ros. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 14(40): 1-55. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; Biography ; Biografía ; Ichthyologists ; Ictiólogos ; Alberto Espinach Ros
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    Ictiólogos de la Argentina: Camilo Antonio Daneri (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  http://aquaticcommons.org/id/eprint/11015 | 196 | 2013-03-18 20:21:01 | 11015 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina.The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible,personal pictures and additional material.The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions.This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historicalcircumstances.I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.
    Keywords: Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Ictiólogos de la Argentina: Enrique Darío Permingeat (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11016 | 196 | 2013-03-18 20:10:00 | 11016 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina.The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible,personal pictures and additional material.The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions.This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances.I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: LÓPEZ, H. L; G. G. GARRIDO & J. PONTE GÓMEZ. 2012. Ictiólogos de la Argentina: Enrique Darío Permingeat. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 14(37): 1 34. ISSN 1515-9329
    Keywords: Biology ; Argentina ; Biography ; Biografía ; Ichthyologist ; Ictiólogos ; Enrique Darío Permingeat
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    Ictiólogos de la Argentina: Aurelio Juan Santiago Pozzi (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11017 | 196 | 2013-03-18 20:08:30 | 11017 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina.The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible,personal pictures and additional material.The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions.This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances.I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: LÓPEZ, H. L; HUGO CASTELLO & J. PONTE GÓMEZ. 2012. Ictiólogos de la Argentina: Aurelio Juan Santiago Pozzi. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 14(38): 1-47. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; Biography ; Biografía ; Ichthyologysts ; Ictiólogos ; Aurelio Juan Santiago Pozzi
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    Type: monograph
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  • 6
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    SAMUDRA Report No. 60, November 2011 (2021)
    International Collective in Support of Fishworkers | Chennai, India
    In:  http://aquaticcommons.org/id/eprint/11174 | 25 | 2013-06-02 15:32:33 | 11174 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-28
    Description: Contents: ITQs in New Zealand.Finfish Farming in Atlantic Canada.Sustainable Small-scale Fisheries.Salmon Aquaculture in Chile.South Africa’s Fisheries Policy.Voluntary Guidelines for SSF
    Description: ISSN 0973-1121
    Keywords: Aquaculture ; Fisheries
    Repository Name: AquaDocs
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  • 7
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    Eighth Deep-Sea Biology Symposium, Monterey, California 1997: abstracts (2021)
    Monterey Bay Aquarium Research Institute | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/10614 | 8 | 2015-04-29 21:11:23 | 10614
    Details
    Publication Date: 2021-06-27
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: book
    Format: application/pdf
    Format: application/pdf
    Format: 161
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  • 8
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    The Dorado-Iconografía (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11008 | 196 | 2013-03-18 20:26:33 | 11008 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: Prosiguiendo con la tarea de rescate de documentos realizada por ProBiota, tomamos la iniciativa de editar en este número la iconografía de la obra The dorado de J. W. Hills y G. H. Harrison ya que a nuestro entender posee un indiscutible valor histórico además de ilustrativo.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: LÓPEZ, H. L. & J. PONTE GÓMEZ (Recopiladores) 2012. The dorado – Iconografía. Tomado de: Hills, J. W. & G. H.Harrison. 1932. The dorado. Impreso por R. MacLehase & Co. Ltd, The University Press, Glasgow; publicado por Philip Allan & Company Ltd. en Quality House, London, W.CA, Great Britain, 190 pp. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Documentos 17: 1-23. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; Ichthyology ; Ictiología ; Iconography ; Iconografía
    Repository Name: AquaDocs
    Type: monograph
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  • 9
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    El Naturalista. (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11011 | 196 | 2013-03-18 20:22:41 | 11011 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: Continuando con el rescate de los diferentes documentos de naturalistas argentinos, se reproduce el presente relato escrito por el Dr. Emiliano Mac Donagh y que fuera publicado en el diario La Nación en la edición del 5 de mayo de 1929.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: MAC DONAGH, E. 2012. El Naturalista. Tomado del diario La Nación, edición del 5 de mayo de 1929. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 16: 1-10. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; Narration ; relato ; Naturistic ; Naturalista
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    Type: monograph
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  • 10
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    Ictiólogos de la Argentina: Mariano Narciso Antonio José Castex (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11031 | 196 | 2013-03-18 20:03:25 | 11031 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: This series will include all those people who, by means of their contributions, great and small, played a part in the consolidation of ichthyology in Argentina.The general plan of this work consists of individual factsheets containing a list of works by each author, along with reference bibliography and, whenever possible,personal pictures and additional material.The datasheets will be published primarily in chronological order, although this is subject to change by the availability of materials for successive editions.This work represents another approach for the recovery and revalorization of those who set the foundations of Argentine ichthyology while in diverse historical circumstances.I expect this to be the beginning of a major work that achieves the description of such a significant part of the history of natural sciences in Argentina.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: LÓPEZ, H. L & J. PONTE GÓMEZ. 2013. Ictiólogos de la Argentina: Mariano Narciso Antonio José Castex. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 14(42): 1-30. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; Biography ; Biografía ; Ichthñyologists ; Ictiólogos ; Mariano Narciso Antonio José Castex
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  • 11
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    Lista de los peces de la provincia de Catamarca (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  danifuchs1@yahoo.com.ar | http://aquaticcommons.org/id/eprint/11012 | 196 | 2013-03-18 20:18:55 | 11012 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-26
    Description: Esta serie tiene como finalidad dar a conocer las especies presentes en los diferentes estados provinciales. Tomando como base los trabajos de López et al., (2003); Reis et al., (2003); Liotta (2006) y Ferraris (2007) actualizamos el elenco ictiofaunístico de cada territorio provincial. No se realizan, con excepción del nombre vulgar y localidad tipo, comentarios y/o observaciones de las especies señaladas ya que estos se encuentran en la bibliografía adjunta. Se incluyen dos tablas que contienen información sobre especies introducidas y de aquellas de presencia dudosa o que requieran confirmación en el territorio provincial. Paraéstas últimas se cita el trabajo que las menciona por vez primera.Consideramos que este modesto aporte contribuirá a precisar el conocimiento ictiofaunístico regional ya que además de la lista de especies, presentamos el marco biogeográfico e hídrico correspondiente.Por otra parte entendemos que la participación de autores involucrados en la región considerada, le da un verdadero sentido federal a esta contribución, además de reforzar vínculos en los protagonistas de nuestra especialidad.En este nuevo número presentamos la provincia de Catamarca que se encuentra enclavada en el centro-oeste de nuestro territorio, limitada por Salta, Tucumán, Santiago del Estero, Córdoba y La Rioja.Uno de los grupos mas representativos del sistema hidrográfico de Catamarca es el de los Trichomycteridae (López, 1992). Esta familia es un ejemplo de altadiversificación en áreas restringidas. Presentan una extensa distribución latitudinal y altitudinal, algunas especies viviendo en el Altiplano boliviano, a más de 4000 m s.n.m., y otras en ambientes de llanura. Las especies de estafamilia poseen alta sensibilidad a cualquier alteración del medio en que viven.Por ello, los cambios que se pudieran producir en su hábitat provocarían efectos directos sobre sus poblaciones (López et al., 1996; Monasterio de Gonzo et al., 2011).Podemos afirmar que el conocimiento de la ictiofauna de la provincia de Catamarca comienza a tomar forma a partir de fines del siglo XX ya que se produce un incremento en los relevamientos de su red hidrográfica, dando como resultado una ampliación del número de especies presentes en su territorio, sumándose desde el trabajo de Berg (1895), 24 especies de las cuales 5 son endémicas.
    Description: Programa para el estudio y uso sustentable de la biota austral (ProBiota)
    Description: Debe citarse: FERNÁNDEZ, L.; D. V. FUCHS; D. O. NADALIN & H. L. LÓPEZ. 2012. Lista de los peces de la provincia de Catamarca. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 17: 1-11. ISSN 1515-9329
    Keywords: Biology ; Argentina ; Catamarca province ; Provincia de Catamarca ; List ; Lista ; Ichthyology ; Ictiología ; Biogeography ; Biogeografía
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    Type: monograph
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  • 12
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    SAMUDRA Report No. 59, July 2011 (2021)
    International Collective in Support of Fishworkers | Chennai, India
    In:  http://aquaticcommons.org/id/eprint/11173 | 25 | 2013-06-02 15:46:04 | 11173 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-28
    Description: Contents: Catch Shares in Fisheries.South Africa’s Small-scale Fishing Policy.WFFP General Assembly.Ecolabels and Sustainable Seafood in the UK.MPAs in Costa Rica.Indigenous Fishing Rights in Chile
    Description: ISSN 0973-1121
    Keywords: Aquaculture ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 13
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    Yemaya, No. 41, November 2012 (2021)
    International Collective in Support of Fishworkers (ICSF) | Chennai, India
    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/11184 | 25 | 2015-09-24 08:22:47 | 11184 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-29
    Description: ISSN 0973-1156
    Keywords: Aquaculture ; Fisheries ; Sociology
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    Type: monograph
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  • 14
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    Yemaya, No. 42, March 2013 (2021)
    International Collective in Support of Fishworkers (ICSF) | Chennai, India
    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/11185 | 25 | 2015-09-24 08:21:49 | 11185 | International Collective in Support of Fishworkers
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    Publication Date: 2021-06-29
    Keywords: Aquaculture ; Fisheries ; Sociology
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  • 15
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    Yemaya, No. 37, July 2011 (2021)
    International Collective in Support of Fishworkers | Chennai, India
    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/11180 | 25 | 2015-09-24 08:24:52 | 11180 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-29
    Description: ISSN 0973-1156
    Keywords: Aquaculture ; Fisheries ; Sociology
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  • 16
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    Yemaya, No. 40, July 2012 (2021)
    International Collective in Support of Fishworkers (ICSF) | Chennai, India
    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/11183 | 25 | 2015-09-24 08:23:16 | 11183 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-29
    Keywords: Aquaculture ; Fisheries ; Sociology
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  • 17
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    Yemaya, No. 39, March 2012 (2021)
    International Collective in Support of Fishworkers | Chennai, India
    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/11182 | 25 | 2015-09-24 08:23:48 | 11182 | International Collective in Support of Fishworkers
    Details
    Publication Date: 2021-06-29
    Description: ISSN 0973-1156
    Keywords: Aquaculture ; Fisheries ; Sociology
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  • 18
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    Benthic marine Amphipoda of southern California: families Aoridae, Photidae, Ischyroceridae, Corophiidae, Podoceridae (2021)
    In:  library@mlml.calstate.edu | http://aquaticcommons.org/id/eprint/11193 | 8 | 2013-06-06 23:58:52 | 11193 | Beaudette Foundation for Biological Research
    Details
    Publication Date: 2021-06-29
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: article
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  • 19
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    Uganda aquaculture value chains: strategic planning mission report (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/11218 | 115 | 2013-06-14 14:13:17 | 11218 | WorldFish Center
    Details
    Publication Date: 2021-06-29
    Description: This report presents the findings and recommendations of a strategic planning mission to reevaluate the feasibility of WorldFish implementing a fish value chain research program in Uganda under the CGIAR Research Program on Livestock and Fish (L&F). The over-arching goal of L&F is to increase productivity of small-scale livestock and fish systems so as to increase availability and affordability of meat, milk and fish for poor consumers and, in doing so, to reduce poverty through greater participation by the poor along animal source food value chains. This will be achieved by making a small number of carefully selected animal source food value chains function better, for example by identifying and addressing key constraints and opportunities (from production to consumption), improving institutional arrangements and capacities, and supporting the establishment of enabling pro-poor policy and institutional environments.
    Description: CGIAR Research Program 3.7 Livestock & Fish
    Keywords: Aquaculture ; Aquaculture ; Uganda
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  • 20
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    Semblanzas Ictiológicas: Leandro Andrés Miranda (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11276 | 196 | 2015-05-30 00:30:22 | 11276 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
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    Publication Date: 2021-06-30
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota: Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: LÓPEZ, H. L. & J. PONTE GÓMEZ. 2013. Semblanzas Ictiológicas: Leandro Andrés Miranda. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(09): 1-11. ISSN 1515-9329
    Keywords: Biology ; Argentina ; Biogeographical sketchs-Semblanzas ; Leandro Andrés Miranda
    Repository Name: AquaDocs
    Type: monograph
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    Solomon Islands: Essential aspects of governance for Aquatic Agricultural Systems in Malaita Hub (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/11256 | 115 | 2013-07-23 09:58:18 | 11256 | WorldFish Center
    Details
    Publication Date: 2021-06-30
    Description: In late 2012, a governance assessment was carried out as part of the diagnosis phase of rollout of the CGIAR Aquatic Agricultural Systems Program in Malaita Hub in Solomon Islands. The purpose of the assessment was to identify and provide a basic understanding of essential aspects of governance related to Aquatic Agricultural Systems in general, and more specifically as a case study in natural resource management. The underlying principles of the approach we have taken are drawn from an approach known as “Collaborating for Resilience” (CORE), which is based on bringing all key stakeholders into a process to ensure that multiple perspectives are represented (a listening phase), that local actors have opportunities to influence each other’s understanding (a dialogue phase), and that ultimately commitments to action are built (a choice phase) that would not be possible through an outsider’s analysis alone. This report begins to address governance from an AAS perspective, using input from AAS households and other networked stakeholders. We attempt to summarize governance issues that are found not only within the community but also, and especially, those that are beyond the local level, both of which may need to be addressed by the AAS program.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Agriculture ; Aquaculture ; Aquatic Agricultural Systems ; Governance
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    River Dart Biological Survey 10th June - 15th July 1968 (2021)
    Devon River Authority
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10879 | 1256 | 2013-03-26 13:40:17 | 10879 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-01
    Description: This is the River Dart Biological Survey from 10th June to 15th July 1968 by the Devon River Authority. This survey was undertaken to investigate the invertebrate bottom fauna of the river and to assess the condition of the river with regard to pollution. It describes the environmental conditions of the River Dart and the biological sampling method used, plus a brief conclusion of the survey. It also contains tables with the different species present and abundance on each sampling stations.
    Description: Environment Agency Archives South West
    Keywords: Biology ; Fisheries ; Limnology ; England ; South West ; River Dart ; Inland waters ; Population structure ; Population dynamics ; Water quality
    Repository Name: AquaDocs
    Type: monograph
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    Semblanzas Ictiológicas: Daniel Enrique Figueroa (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11278 | 196 | 2015-05-30 00:22:53 | 11278 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-30
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temasde trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota: Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: LÓPEZ, H. L. & J. PONTE GÓMEZ. 2013. Semblanzas Ictiológicas: Daniel Enrique. Figueroa. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(11): 1-14. ISSN 1515-9329
    Keywords: Biology ; Argentina ; Biogeographical sketchs-Semblanzas ; Daniel Enrique Figueroa
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    Semblanzas Ictiológicas: Juan Martín Díaz de Astarloa (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/11273 | 196 | 2015-05-30 00:29:40 | 11273 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-30
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temasde trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota: Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: LÓPEZ, H. L. & J. PONTE GÓMEZ. 2013. Semblanzas Ictiológicas: Juan Martín Díaz de Astarloa. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(06): 1-12. ISSN 1515-9329
    Keywords: Biology
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    The role of substrate, flow and larval supply to recruitment of the red abalone (Haliotis rufescens) (2021)
    University of California, Santa Barbara, Biology
    In:  jessie.altstatt@gmail.com | http://aquaticcommons.org/id/eprint/11330 | 29 | 2013-08-26 17:25:52 | 11330
    Details
    Publication Date: 2021-07-01
    Description: Precipitous declines in wild populations of the red abalone Haliotis rufescens and the eventual closure of the commercial and southern recreational fishery have led to renewed interest in supplementing wild stocks with hatchery-raised individuals. Most work to date has focused on releasing small juveniles and has had limited success. Although much is known about larval settlement, juvenile survivorship and growth of abalone, there is scanty information on natural processes in the field. The failure of many regulated fisheries worldwide suggests that both the larval and juvenile stages may be important in determining the future population, and that early juvenile mortality is more important than previously believed. This paper presents a series of experiments designed to examine factors and mechanisms that could affect settlement, survivorship, and growth of larvae and early post-settlers in the field.Laboratory trials under different flow regimes showed that red abalone larvae settled preferentially on substrates encrusted with coralline algae, and that settlement was rapid when exposed to crusts compared to other surfaces. Urchin grazing of films appeared to facilitate abalone settlement but only when urchins were removed. Initial field experiments showed that released larvae settled on natural cobble rock, and that settlement was at least one order of magnitude greater when settlement habitats were tented. I then examined post-settlement survivorship at one and two days after settlement, and found that although there was a large amount of variation, on average 10% of released larvae were found as newly-settled recruits after 1 day. Survivorship and growth of recruits were followed over at least one month in both Spring and Fall. Abalone settled at higher densities, survived better and grew faster in the warmer Fall months than in the Spring. The density of month-old abalone recruits was correlated with density of naturally-occurring gastropods in the Spring, but not in the Fall. These results suggest that settlement and survivorship can be extremely variable across space and time, and that oceanographic and local biotic conditions play a role and should be considered when planning larval seeding.
    Description: Masters
    Description: Copyright permission signed by the author is on file with the IAMSLIC archive. PDF contains 116 pages (front matter + 109 pp.).
    Keywords: Biology ; Ecology ; Fisheries
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    Type: thesis
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    Estimating biomass of Macrocystis in the Hopkins Marine Life Refuge (edited by James M. Watanabe) (2021)
    Stanford University | Pacific Grove, CA
    In:  http://aquaticcommons.org/id/eprint/10920 | 29 | 2013-02-26 14:46:10 | 10920
    Details
    Publication Date: 2021-07-02
    Description: Copyright permission signed by the author is on file with the IAMSLIC archive.
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
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    Indications of compensatory growth in the striped bass, Roccus saxatilis Walbaum, as revealed by a study of the scales. (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12401 | 130 | 2014-02-08 01:09:54 | 12401 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: Analysis of scale samples from 87 striped bass from the 1940 year class of the Chesapeake Bay, and 39 samples from the 1938 year class of the Hudson River, indicated that the smaller yearling individuals made a more rapid growth in their second year than the larger ones. Compensation was not complete, since the growth advantage of the larger individuals is maintained to a considerable degree.
    Keywords: Biology ; Fisheries
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    Ovarian growth and ovulation in the mature blue crab, Callinectes sapidus Rathbun (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12399 | 130 | 2014-02-08 01:07:00 | 12399 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: Introduction.Observations: structure of the ovary during the periods of growth and ovulation in the mature crab (stages 1-5).Discussion and conclusions.
    Keywords: Aquaculture ; Biology ; Fisheries
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    The larval stages of the calanoid copepod Eurytemora hirundoides (Nordquist) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12402 | 130 | 2014-02-08 01:09:02 | 12402 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: Most Copepoda pass through, first, a series of nauplius stages, and then through a series of copepodid stages (or cyclops stages), in which the general form of the adult is assumed. ... In the first place, the differentiation between the larvae of the various copepod species to be found in the plankton, both marine and fresh water, greatly augments the value and accuracy of quantitative and qualitative plankton analyses, because many species spend a large portion of their life span in an immature condition. In the second place, the taxonomy of the Copepoda is admittedly not completely satisfactory ...
    Keywords: Biology ; Fisheries
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    Fütterungsversuche an Regenbogenforellen (2021)
    In:  SF@ti.bund.de | http://aquaticcommons.org/id/eprint/12411 | 1240 | 2014-03-03 19:49:17 | 12411 | Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
    Details
    Publication Date: 2021-06-30
    Description: “Institut für Küsten- und Binnenfischerei” was an independent Institute. Later, it was transferred to the „Institut für Seefischerei“.
    Keywords: Fisheries ; feeding experiments ; Aquaculture ; Salmo gairdnerii ; Rainbow Trout ; penicillin residues ; fish feeding ; Vitamin T ; growth
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    Ecological factors related to the distribution of Bankia gouldi Bartsch in Chesapeake Bay (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12430 | 130 | 2014-02-08 03:56:16 | 12430 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: Organisms were collected on test panels, six inch lengths of dressed two by four inch pine, suspended in the water in a vertical position as described by Turner (1947). The panels were usually located at some convenient structure such as a dock-piling or sea-wall. Except where otherwise indicated by the data, the samples were collected from each station once a month between May 1950 and May 1953. During the three year period, seven hundred and nineteen panels were submerged in Chesapeake Bay. Approximately 14,000 organisms were encountered on these panels of which 20% or approximately 3,000 organisms could be identified from the dried pallets. Preliminary notes on the extent of fouling were made in the field after which the samples were removed to the laboratory for further study.
    Keywords: Biology ; Ecology ; Fisheries ; fouling
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    The food habits of hatchery-produced pond-cultured shad (Alosa sapidissima) reared to a length of two inches (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12428 | 130 | 2014-02-08 03:58:43 | 12428 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: The present study was aimed at determining the food habits of hatchery-produced, pond-cultured shad (Alosa sapidissima) reared to a total length of approximately two inches. More specifically, the objectives were to determine: (1) That point in life at which young shad start to consume food; (2) What type or types of food the young shad consume at the onset of feeding; (3) Food changes, if any, which occur with age and growth in size up to the arbitrarily designated total length of two inches. The plan was that the shad larvae be introduced into an outdoor rearing pond previously fertilized, and that the larvae be dependent upon the plankton for food as they would be under natural conditions.
    Keywords: Aquaculture ; Fisheries
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    Preliminary Observations on spawning potential in the striped bass (Roccus saxatilis Walbaum) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12426 | 130 | 2014-02-08 04:04:47 | 12426 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: This study was initiated during the summer of 1940 with the following objectives: (1) To determine at what age sexual maturity begins in striped bass of the Chesapeake Bay. (2) To determine whether the potential of reproduction declines with increasing age in Chesapeake Bay fish. (3) To determine whether striped bass in northern waters have a spawning cycle similar to that found in the Chesapeake Bay fish.
    Keywords: Biology ; Ecology ; Fisheries
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  • 34
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    A five-year study of the striped bass fishery of Maryland, based on analyses of the scales (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12578 | 130 | 2014-02-08 04:06:54 | 12578 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: The striped bass, or rock as the species is called in the Chesapeake area, ranks high in value and volume among the commercially important fish taken in Maryland waters and, in addition, is highly prized as a game fish by sportsmen. Interest in the marked fluctuations characteristic of the species stimulated the investigation begun in October, 1941.
    Description: University of Maryland Graduate School
    Description: U.S. Fish and Wildlife Service
    Description: Maryland Department of Research and Education
    Keywords: Biology ; Fisheries
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    The life history of the silverside, Menidia menidia (Linnaeus) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12580 | 130 | 2014-02-08 01:03:40 | 12580 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: This paper is based on an attempt to assemble the existing knowledge of the silverside, Menidia menidia, and to contribute to what is known about the life history of this species. A vast amount of work is needed on the ecological relationships between the food fish and the forage fish. One of the most important forage fishes on the Atlantic Coast is the silverside. To understand the inter-relationships between the food fish and the forage fish it is necessary first to understand the life histories of both. For this reason it is important that the life history of this species be studied.
    Keywords: Biology ; Ecology ; Fisheries
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    An ecological study of seasonal distribution of Ostracoda, Solomons Island, Maryland, region (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12579 | 130 | 2014-02-10 02:22:35 | 12579 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: The determination of the distribution and seasonal fluctuations of ostracodes living in the littoral zone directly in front of the Chesapeake Biological Laboratory has been attempted in the present study. Samples taken in other parts of the Chesapeake Bay and around Solomons harbor, show that other species of ostracodes exist but these forms have not been considered in the two-year study here reported. The seasonal distribution of the species was compared with hydrographical records furnished for the same period by the Chesapeake Biological Laboratory in order to determine the correlation between ecological factors and seasonal fluctuations in numbers and species of Ostracoda.
    Keywords: Biology ; Ecology ; Fisheries
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    Muskrats on tidal marshes of Dorchester County (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12581 | 130 | 2014-02-10 02:24:59 | 12581 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: This bulletin reports, in a non-technical manner, investigations on the Virginia muskrat, prevalent in Maryland, from July, 1949 to June, 1951.
    Description: International Health Division of the Rockefeller Foundation
    Description: Maryland Game and Inland Fish Commission
    Keywords: Biology ; Ecology
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    Status of coral reefs of Little Cayman, Grand Cayman and Cayman Brac, British West Indies in 1999 and 2000. (Part 1: Stony corals and algae) (2021)
    In:  http://aquaticcommons.org/id/eprint/12583 | 9 | 2014-03-25 18:35:11 | 12583 | Central Caribbean Marine Institute
    Details
    Publication Date: 2021-06-30
    Description: In: Lang, J.C.(ed.) (2003) Status of coral reefs in the western Atlantic: results of initial surveys, Atlantic & Gulf Rapid Reef Assessment (AGRRA) Program.
    Keywords: Biology ; Environment
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    First record of the basslet Gramma dejongi outside of Cuba (2021)
    In:  http://aquaticcommons.org/id/eprint/12582 | 9 | 2014-03-25 18:25:52 | 12582 | Central Caribbean Marine Institute
    Details
    Publication Date: 2021-06-30
    Description: Coral Reefs, Articles Online, 07 November 2013
    Keywords: Biology ; Fisheries
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  • 40
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    Assessment of the carp seeds value chain in southern Bangladesh (final draft) (2021)
    WorldFish | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12702 | 115 | 2013-12-04 08:17:43 | 12702 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The Aquaculture for Income and Nutrition (AIN) project implemented by World Fish and funded by USAID, aims at increasing aquaculture production in 20 districts of Southern Bangladesh (Greater Khulna, Greater Barisal, Greater Jessore and Greater Faridpur) to reduce poverty and enhance nutritional status. As part of its initial scoping activities World Fish commissioned this value chain assessment on the market chains of carp fish seed (spawn, fry and fingerlings) in the southern region of Bangladesh. The purpose of this study is to obtain a clearer understanding of the volumes of fish produced and consumed in Southern Bangladesh and their origin (by system and location), their destination (by type of market, type of consumer and location), and to gain a clearer understanding of potential market based solutions to farmer’s problems, which the project could implement.
    Description: CGIAR Research Program Livestock and Fish
    Keywords: Aquaculture ; Aquaculture ; Nutrition ; Value chain ; Marketing ; Fishery product
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  • 41
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    Feed the future aquaculture project: annual report October 2011-Sept 2012 (2021)
    WorldFish | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12700 | 115 | 2013-12-04 08:13:26 | 12700 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The Feed the Future Aquaculture project is a five year transformative investment in aquaculture focused on 20 southern districts in Barisal, Khulna and Dhaka divisions, Bangladesh. This report describes the achievements of FtF-Aquaculture project activities implemented during FY12. Some of the targets for production and associated income have not been achieved yet as a large share of the fish will be harvested after closing of the reporting period. However, on the basis of growth monitoring, indications are that production is on track to achieve the targets.
    Description: CGIAR Research Program Livestock and Fish
    Keywords: Aquaculture ; Aquaculture ; Research ; Food security ; Livelihoods
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  • 42
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    Value chain analysis: shrimp, prawn and tilapia from the southern region of Bangladesh & feasibility analysis: brackish water sea-bass in the southern region in Bangladesh (2021)
    WorldFish | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12703 | 115 | 2013-12-03 12:57:19 | 12703 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The WorldFish Center is implementing the FtF Aquaculture Project in 20 southern districts in Bangladesh. The project is implemented under USAID’s Feed the Future initiative in collaboration with the Government of Bangladesh. The project contributes to achieving the ‘Feed the Future’ goals through four objectives: (i) dissemination of improved quality fish and shrimp seed, (ii) improving the nutrition and income status of farm households, (iii) increasing investment, employment and fish production through commercial aquaculture and (iv) policy and regulatory reform and institutional capacity building to support sustainable aquaculture growth. The project commissioned this study to gather insights into the value chains of shrimp, prawn and tilapia in the project region and the feasibility of promoting culture of brackish water sea-bass in the region. The findings and recommendations are expected to provide the foundation for the project to design its interventions for achieving its goals.
    Description: CGIAR Research Program Livestock and Fish
    Keywords: Aquaculture ; Aquaculture ; Seed (aquaculture) ; Policies ; Shrimp culture
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    2012 Annual report (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12704 | 115 | 2013-12-03 13:03:36 | 12704 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The CGIAR Research Program on Aquatic Agricultural Systems is a multi-year research initiative launched in July 2011. It is designed to pursue community-based approaches to agricultural research and development that target the poorest and most vulnerable rural households in aquatic agricultural systems. Led by WorldFish, a member of the CGIAR Consortium, the program is partnering with diverse organizations working at local, national and global levels to help achieve impacts at scale.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Agriculture ; Aquaculture ; Agriculture ; Aquaculture ; Development projects ; research
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    Synthesis of aquaculture policy and development approaches in Africa (2021)
    WorldFish | Zomba, Malawi
    In:  http://aquaticcommons.org/id/eprint/12705 | 115 | 2013-12-04 01:31:27 | 12705 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The WorldFish Center was tasked to undertake a study to access, collate and develop background materials to produce an internationally linked and Africa-wide perspective on sectorally relevant policy issues. The specific objective of the study was to assess and define conditions and impact pathways, in Africa or elsewhere, where markets, policies, resources and technologies have combined to promote steady and sustainable growth of aquaculture, and where have been clear direct impacts on food supply, income, employment and consumption opportunities, as well as increase in supply that has led to stabilised prices. The study was also aimed at providing guidelines for scaling up the implementation of the synthesis study via Afri-FishNet (CAADP Fish Expert Pools) at the national and regional levels.
    Description: Submitted to: The NEPAD Aquaculture Working Group, NEPAD Programme on African Fisheries. NEPAD Fish Node, Bunda College, Lilongwe
    Keywords: Aquaculture ; Sociology ; Aquaculture ; Policies ; Governance ; Africa
    Repository Name: AquaDocs
    Type: monograph
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    Feed the future aquaculture project: draft quarterly progress report, Jan-March 2013 (2021)
    WorldFish | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12701 | 115 | 2013-12-04 08:15:49 | 12701 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: The Feed the Future Aquaculture project is a five year transformative investment in aquaculture focused on 20 southern districts in Barisal, Khulna and Dhaka divisions, Bangladesh, which started in October 2011. This report describes the achievements of FtF-Aquaculture project activities implemented during the 6th quarter (January to March 2013) along with cumulative progress on FtF indicators. Due to the seasonality of fish and shrimp production, which is out of sync with the project year, final harvesting of aquaculture production was completed in this quarter. The achievements summarized below relate to progress of project activities. Progress against the FtF indicators that were not reported on previously are now included in this report.
    Description: CGIAR Research Program Livestock and Fish
    Keywords: Aquaculture ; Aquaculture ; Research ; Food security ; Livelihoods
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    Genetic improvement of freshwater prawn, Macrobrachium rosenbergii (de Man) in India. Phase two: annual report for period January to December 2012 (2021)
    WorldFish | Bhubaneswar, India
    In:  http://aquaticcommons.org/id/eprint/12749 | 115 | 2013-12-03 13:46:30 | 12749 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: Macrobrachiurn rosenbergii is one of the widely cultured freshwater prawn species globally. India was the third largest producer of this species in 2007 and its aquaculture production rose to 43,000 metric tons (t) in 2005 froin less than 500 t in 1995. However, since then production has been declining and in 2008-09 it was 12,856 t, a reduction of more than 70% compared to 2005. There are several contributing factors to this decline, such as slow growth rate, poor survival, disease outbreaks, increase in cost of production, and availability of low risk alternative fish species. However, there is a consensus that poor seed quality leading to unsatisfactory growth and survival rates in ponds is one of the major reasons. Hence, the development of a systematic selective breeding program aimed at improving growth rate and ensuring high survival rate of this species was deemed a high priority. The Central Institute of Freshwater Aquaculture (CIFA), Bhubaneswar, India in collaboration with the WorldFish Center, Malaysia initiated a selective breeding program for this species in 2007.
    Description: CIFA - WorldFish Project on Genetic Improvement of Freshwater Prawn, Macrobrachium rosenbergii (de Man) in India (Phase Two)
    Keywords: Aquaculture ; Prawn culture ; Genetics ; Seed production ; Selective breeding ; Freshwater aquaculture ; India •Livestock and Fish
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    Community-based marine resource management in Solomon Islands: a facilitators guide (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12751 | 115 | 2013-12-03 13:58:51 | 12751 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: This guide was developed to document the process and activities that WorldFish staff have used and adapted as facilitators working with communities interested in marine resource management in Solomon Islands. It draws on the experiences from work conducted with FSPI and MFMR through ACIAR funded projects, with communities that had a primary interest in the management of coral reef fisheries. Since 2011 the process has been trialed and adapted further with communities interested in mangrove ecosystem management (through the MESCAL project). This guide is based on lessons about the process of a community developing, writing and implementing a management plan. This guide does not cover lessons about the outcomes of that management.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Description: Based on lessons from implementing CBRM with rural coastal communities in Solomon Islands (2005-2013)
    Keywords: Aquaculture ; Fisheries ; Ecology ; Marine resources ; Resource management ; Participatory approach ; Solomon Islands
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    Institutional, policy and regulatory framework for sustainable development of the Egyptian aquaculture sector (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12756 | 115 | 2013-12-04 08:34:48 | 12756 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: This report presents the findings of a mission to critically review the institutional, policy and regulatory framework for sustainable development of the Egyptian aquaculture sector. The study was undertaken by an International Expert on Aquaculture Policy, and a National Expert on Institutions, on behalf of the Project “Improving Employment and Income through the Development of Egypt’s Aquaculture Sector“, implemented by WorldFish and CARE, and funded by the Swiss Agency for Development and Cooperation(SDC). The objective of the mission was to assess the current status of the Egyptian aquaculture sector, in terms of the policy, legal and institutional environment, with a view to suggesting the major issues to be addressed within a future policy dialogue.
    Description: Swiss Agency for Development and Cooperation
    Description: Improving Employment and Income through the Development of Egypt’s Aquaculture Sector (IEIDEAS) Project
    Keywords: Aquaculture ; Aquaculture ; Policy ; Governance ; Aquaculture development ; Egypt
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    Food and nutrition security in Timor-Leste (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12757 | 115 | 2013-12-04 08:29:50 | 12757 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: This report is a literature review on Food and Nutrition Security in Timor-Leste based on data from surveys conducted by the Timor-Leste National Statistics Directorate, as well as from national and international organizations working in Timor-Leste. This review was supported by the Australian Centre for International Agricultural Research (ACIAR)-funded project “Strategy for Investment in Fisheries in East Timor”. This report describes the current food and nutrition situation in Timor-Leste for the purpose of planning and implementing interventions aimed at improving food and nutrition security, especially within aquatic agricultural systems. The potential role of aquaculture in improving food and nutrition security is considered, with reference to the recently endorsed Timor-Leste National Aquaculture Development Strategy (2012-2030) developed by the National Directorate of Fisheries and Agriculture, Ministry of Agriculture and Fisheries.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Aquaculture ; Aquaculture ; Nutrition ; Food security ; Gender
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    Type: monograph
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    Solomon Islands Aquatic Agricultural Systems Program design document (2021)
    WorldFish | Solomon Islands
    In:  http://aquaticcommons.org/id/eprint/12753 | 115 | 2013-12-03 14:16:27 | 12753 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: WorldFish is leading the CGIAR Research Program on Aquatic Agricultural Systems together with two other CGIAR Centers; the International Water Management Institute (IWMI) and Bioversity. In 2012 and 2013 the AAS Program rolled out in Solomon Islands, Zambia, Bangladesh, Cambodia and the Philippines. Aquatic Agricultural Systems are places where farming and fishing in freshwater and/or coastal ecosystems contribute significantly to household income and food security. The program goal is to improve the well-being of AAS-dependent people. A hub is a geographic location that provides a focus for learning, innovation and impact through participatory action research. In Solomon Islands AAS works in Malaita Hub (Malaita Province) and Western Hub (Western Province). In each hub we identify a ‘Development Challenge’ that the Program will address to give us focus and motivation.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Agriculture ; Aquaculture ; Aquatic Agricultural Systems ; Research ; Development projects ; Solomon Islands
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    Tonle Sap scoping report (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12823 | 115 | 2016-03-01 06:59:01 | 12823 | WorldFish Center
    Details
    Publication Date: 2021-07-06
    Description: The scoping mission team was composed of 14 people representing research institutions (RUPP), government (FiA, IFReDI), NGOs (ANKO, ADIC) and CGIAR institutions (WorldFish and Bioversity). The scoping trip was carried out over a 7-day period from April 28 to May 4 within eight (8) communities in Kampong Thom, Siem Reap, Battambang, Pursat and Kampong Chhnang. In addition, panel discussions were held with local government, fishery, agriculture and water management institutions, NGOs, the private sector and communities, and were convened in Siem Reap, Battambang and Pursat. The AAS scoping team focused their enquiries on five themes, and the findings of this report are presented in sections that highlight the opportunities, challenges and knowledge gaps related to each theme. The sections have been lightly edited to maintain the style and intention of the authors. The themes are: 1) AAS production systems--fish, rice, aquaculture. 2) Livelihoods, poverty, and gender equity . 3) Value chains and markets. 4) Institutions and governance. 5) Knowledge management and partnerships.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Agriculture ; Aquaculture ; Policies ; Aquatic Agricultural Systems ; Development projects ; Research ; Aquaculture ; Fisheries ; Agriculture ; Value chains ; Livelihoods ; Governance ; Gender ; Poverty reduction ; Cambodia ; Tonle Sap L.
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    Study of the Deep Water Benthos of the Northwestern Gulf of Mexico (2021)
    Texas A&M University
    In:  http://aquaticcommons.org/id/eprint/14155 | 9596 | 2020-08-31 18:04:49 | 14155 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: The purpose of this study is to provide some insight into the nature of the bottom fauna of the deep water of the northwestern Gulf of Mexico. Deep water, in this case, is considered to be from 100 fathoms to a maximum depth of over 2000 fathoms. The samples considered in this study were collected during three cruises of the R/V Alaminos at depths within the above range. The positions and depths of the sampling stations of these cruises are listed in Table I. The lack of published material on the benthos from these depths in the northwestern Gulf of Mexico is evidenced in the following review.
    Description: Masters
    Keywords: Biology ; benthos ; deep water
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    Type: thesis
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    Study of the Juvenile Shrimp Populations, Penaeus aztecus and Penaeus setiferus, of Galveston Bay (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14198 | 9596 | 2020-08-31 20:31:32 | 14198 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: One hundred and twenty-three samples were collected producing 3085 white shrimp and 3703 brown shrimp. Juvenile brown shrimp entered the bay in three waves in April, July, and August. Young whites entered in three waves in July, August, and September. The brown shrimp was the more abundant species. Samples produced about one-third as many brown and white shrimp as those of 1961 and about one-tenth as many as those of 1960. Temperatures followed the normal seasonal trend, except for the freeze in January, and a six degree centigrade decline in March. The reduced amount of rainfall and river flow this year resulted in the higher bay salinities than in 1960-61.
    Keywords: Aquaculture ; Fisheries ; penaeid shrimp ; Penaeus aztecus ; Penaeus setiferus ; juveniles ; population dynamics
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    Computation, Analysis and Preparation of Coastwide Oyster Population Data - Survey of Oyster Population and Associated Organisms (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14201 | 9596 | 2020-08-31 20:32:13 | 14201 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Galveston Bay, Matagorda Bay, San Antonio Bay, Aransas Bay and South Bay areas were sampled at a total of nineteen stations to determine the population characteristics and fluctuations of oysters on the Texas coast. Population samples taken at monthly intervals from these stations showed heavy spat setting occurred in June 1962 and continued in moderation through December 1962. Survival of spat and seed class oysters ranged from moderate in Galveston Bay to excellent in the lower coastal bays. No extensive natural moralities were noted in any of the bay areas and the number of market-sized oysters increased in nearly all the bays. Dermocystidium marinum incidence maintained a high level, but no moralities were associated with the fungus. Oyster populations in Aransas Bay have recovered from the 1959 die-off and are once again approaching an overcrowded conditions for lack of harvesting. Artificial reefs, built in Aransas and Matagorda Bays, have been extremely successful and have attained the characteristics of natural oyster reefs.
    Keywords: Biology ; Fisheries ; oysters ; marine molluscs ; population dynamics ; oyster reefs ; artificial reefs ; growth ; mortality
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    Chemical Analysis of Sinclair Refinery's Waste Waters, Pasadena, Texas - Industrial Waste Control in Region MP-1 (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14233 | 9596 | 2020-08-23 21:38:45 | 14233 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Sinclair Refinery is located on the Houston Ship Channel approximately 2.5 miles above the Washburn Tunnel in Pasadena, Texas. Sinclair employs 2000 personnel and processes over 150,000 barrels of crude per day. Five thousand gallons per minute of waste waters from the refinery enter the Houston Ship Channel after being run through old, outdated, oil skimmers. Samples of this discharge were analyzed for the presence of potentially harmful chemical constituents. It is believed that with the completion of the new retention basin and acid pond with pH control a substantial improvement in water quality should be achieved.
    Keywords: Aquaculture ; Pollution ; wastewater ; chemical analysis ; water analysis ; water quality ; oil pollution ; industrial wastes ; oil refineries ; GBIC
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    Application of an acoustic–trawl survey design to improve estimates of rockfish biomass (2021)
    In:  dana.hanselman@noaa.gov | http://aquaticcommons.org/id/eprint/14482 | 403 | 2014-02-27 17:12:09 | 14482 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-25
    Description: Biomass estimates of several species of Alaskan rockfishesexhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in the spatial distribution of rockfishes that is not well accounted for by the survey design currently used. We evaluated the performance of an experimental survey design, the Trawl and Acoustic Presence/Absence Survey (TAPAS), to reduce the variability in estimated biomass for Pacific ocean perch (Sebastes alutus). Analysis of archived acoustic backscatter data produced an acoustic threshold for delineating potential areas of high (“patch”) and low (“background”) catch per unit of effort (CPUE) in real time. In 2009, we conducted a 12-day TAPAS near Yakutat, Alaska. We completed 59 trawls at 19 patch stations and 40 background stations. The design performed well logistically, and Pacific ocean perch (POP) accounted for 55% of the 31 metric tons (t) of the catch from this survey. The resulting estimates of rockfish biomass were slightly less precise than estimates from simple random sampling. This difference in precision was due to the weak relationship of CPUE to mean volume backscattering and the relatively low variability of POP CPUE encountered. When the data were re-analyzed with a higher acoustic threshold than the one used in the field study, performance was slightly better with this revised design than with the original field design. The TAPAS design could be made more effective by establishing a stronger link between acoustic backscatter and CPUE and by deriving an acoustic threshold that allows better identification of backscatter as that from the target species.
    Keywords: Biology ; Ecology ; Fisheries
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    Temporal trends (2000–2011) and influences on fishery-independent catch rates for loggerhead sea turtles (Caretta caretta) at an important coastal foraging region in the southeastern United States (2021)
    In:  arendtm@dnr.sc.gov | http://aquaticcommons.org/id/eprint/14489 | 403 | 2014-02-13 04:28:13 | 14489 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Seasonal trawling was conducted randomly in coastal (depths of 4.6–17 m) waters from St. Augustine, Florida, (29.9°N) to Winyah Bay, South Carolina (33.1°N), during 2000–03, 2008–09, and 2011 to assess annual trends in the relative abundance of sea turtles. A total of 1262 loggerhead sea turtles (Caretta caretta) were captured in 23% (951) of 4207 sampling events. Capture rates (overall and among prevalent 5-cm size classes) were analyzed through the use of a generalized linear model with log link function for the 4097 events that had complete observations for all 25 model parameters. Final models explained 6.6% (70.1–75.0 cm minimum straight-line carapace length [SCLmin]) to 14.9% (75.1–80.0 cm SCLmin) of deviance in the data set. Sampling year, geographic subregion, and distance from shore were retained as significant terms in all final models, and these terms collectively accounted for 6.2% of overallmodel deviance (range: 4.5–11.7% of variance among 5-cm size classes). We retained 18 parameters only in a subset of final models: 4 as exclusively significant terms, 5 as a mixture of significant or nonsignificant terms, and 9 as exclusively nonsignificant terms. Four parameters also were dropped completely from all final models. The generalized linear model proved appropriate for monitoring trends for this data set that was laden with zero values for catches and was compiled for a globally protected species. Because we could not account for much model deviance, metrics other than those examined in our study may better explain catch variability and, once elucidated, their inclusion in the generalized linear model should improve model fits.
    Keywords: Biology ; Ecology ; Fisheries
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    Reactions of fishes to two underwater survey tools, a manned submersible and a remotely operated vehicle (2021)
    In:  tom.laidig@noaa.gov | http://aquaticcommons.org/id/eprint/14494 | 403 | 2014-02-13 04:22:14 | 14494 | United States National Marine Fisheries Service
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    Publication Date: 2021-06-26
    Description: We examined the reactions of fishes to a manned submersible and a remotely operated vehicle (ROV) during surveys conducted in habitats of rock and mud at depths of 30–408 m off central California in 2007. We observed 26 taxa for 10,550 fishes observed from the submersible and for 16,158 fishes observed from the ROV. A reaction was defined as a distinct movement of a fish that, for a benthic or hovering individual, was greater than one body length away from its initial position or, for a swimming individual, was a change of course or speed. Of the observed fishes, 57% reacted to the ROV and 11% reacted to the submersible. Aggregating species and those species initially observed off the seafloor reacted most often to both vehicles. Fishes reacted more often to each vehicle when they were 〉1 m above the seafloor (22% of all fishes 〉1 m above the seafloor reacted to the submersible and 73% to the ROV) than when they were in contact with the seafloor (2% of all reactions to the submersible and 18% to the ROV). Fishes reacted by swimming away from both vehicles rather than toward them. Consideration of these reactions can inform survey designs and selection of survey tools and can, thereby, increase the reliability of fish assemblage metrics (e.g., abundance, density, and biomass) and assessments of fish and habitat associations.
    Keywords: Biology ; Ecology ; Fisheries
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    A new species of western Atlantic lizardfish (Teleostei: Synodontidae: Synodus) and resurrection of Synodus bondi Fowler, 1939, as a valid species from the Caribbean with redescriptions of S. bondi, S. foetens (Linnaeus, 1766), and S. intermedius (Agassiz, 1829) (2021)
    In:  frableb@si.edu | http://aquaticcommons.org/id/eprint/14499 | 403 | 2014-02-13 04:18:37 | 14499 | United States National Marine Fisheries Service
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    Publication Date: 2021-06-26
    Description: Western Atlantic synodontid species were studied as part of an ongoing effort to reanalyze Caribbean shorefish diversity. A neighbor-joining tree constructed from cytochrome c oxidase I (COI) data revealed 2 highly divergent genetic lineages within both Synodus intermedius (Agassiz, 1829) (Sand Diver) and S. foetens (Linnaeus, 1766) (Inshore Lizardfish). A new species, Synodus macrostigmus, is described for one of the S. intermedius lineages. Synodus macrostigmus and S. intermedius differ in number of lateral-line scales, caudal pigmentation, size of the scapular blotch, and shape of the anterior-nostril flap. Synodus macrostigmus and S. intermedius have overlapping geographic and depth distributions, but S. macrostigmus generally inhabits deeper water (〉28 m) than does S. intermedius and is known only from coastal waters of the southeastern United States and the Gulf of Mexico, in contrast to those areas and the Caribbean for S. intermedius. Synodus bondi Fowler, 1939, is resurrected from the synonymy of S. foetens for one of the S. foetens genetic lineages. The 2 species differ in length and shape of the snout, number of anal-fin rays, and shape of theanterior-nostril flap. Synodus bondi and S. foetens co-occur in the central Caribbean, but S. bondi otherwise has a more southerly distribution than does S. foetens. Redescriptions are provided for S. intermedius, S. foetens, and S. bondi. Neotypes are designated for S. intermedius and S. foetens. A revised key to Synodus species in the western Atlantic is presented.
    Keywords: Biology ; Ecology ; Fisheries
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    Quantifying intrapopulation variability in stable isotope data for Spotted Seatrout (Cynoscion nebulosus) (2021)
    In:  fulford.richard@epa.gov | http://aquaticcommons.org/id/eprint/14498 | 403 | 2014-02-13 04:19:23 | 14498 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Stable isotope (SI) values of carbon (δ13C) and nitrogen (δ15N) are useful for determining the trophic connectivity between species within an ecosystem, but interpretation of these data involves important assumptions about sources of intrapopulation variability. We compared intrapopulation variability in δ13C and δ15N for an estuarine omnivore, Spotted Seatrout (Cynoscion nebulosus), to test assumptions and assess the utility of SI analysis for delineation of the connectivity of this species with other species in estuarine food webs. Both δ13C and δ15N values showed patterns of enrichment in fish caught from coastal to offshore sites and as a function of fish size. Results for δ13C were consistent in liver and muscle tissue, but liverδ15N showed a negative bias when compared with muscle that increased with absolute δ15N value. Natural variability in both isotopes was 5–10 times higher than that observed in laboratory populations, indicating that environmentally driven intrapopulation variability is detectable particularly after individual bias is removed through sample pooling. These results corroborate the utility of SI analysis for examination of the position of Spotted Seatrout in an estuarine food web. On the basis of these results, we conclude that interpretation of SI data in fishes should account for measurable and ecologically relevant intrapopulation variability for each species and system on a case by case basis.
    Keywords: Biology ; Ecology ; Fisheries
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    Shifts in the estuarine demersal fish community after a fishery closure in Puget Sound, Washington (2021)
    In:  essing@uw.edu | http://aquaticcommons.org/id/eprint/14504 | 403 | 2014-02-13 18:26:57 | 14504 | United States National Marine Fisheries Service
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    Publication Date: 2021-06-26
    Description: Puget Sound is one of the largest and most ecologically significant estuaries in the United States, but the status and trends of many of its biological components are not well known. We analyzed a 21-year time series of data from standardized bottom trawl sampling at a single study area to provide the first assessment of population trends of Puget Sound groundfishes after the closure of bottom trawl fisheries. The expected increase in abundance was observed for only 3 of 14 species after this closure, and catch rates of most (10) of the abundant species declined through time. Many of these changes were stepwise (abrupt) rather than gradual, and many stocks exhibited changes in catch rate during the 3-year period from 1997 through 2000. Nodetectable change was recorded for either temperature or surface salinity over the entire sampling period. The abrupt density reductions that were observed likely do not reflect changes in demographic rates but may instead represent distributional shifts within Puget Sound.
    Keywords: Biology ; Ecology ; Fisheries
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    Migratory and within-estuary behaviors of adult Summer Flounder (Paralichthys dentatus) in a lagoon system of the southern mid-Atlantic Bight (2021)
    In:  kcapossela@dnr.state.md.us | http://aquaticcommons.org/id/eprint/14503 | 403 | 2014-02-13 18:09:48 | 14503 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: We monitored the movements of 45 adult Summer Flounder (Paralichthys dentatus) between June 2007 and July 2008 through the use of passive acoustic telemetry to elucidate migratory and within-estuary behaviors in a lagoon system of the southern mid-Atlantic Bight. Between 8 June and 10 October 2007, fish resided primarily in the deeper (〉3 m) regions of the system and exhibited low levels of large-scale (100s of meters) activity. Mean residence time within this estuarine lagoon system was conservatively estimated to be 130 days (range: 18–223 days), which is 1.5 times longer than the residence time previously reported for Summer Flounder in a similar estuarine habitat ~250 km to the north. The majority of fish remained within the lagoon system until mid-October, although some fish dispersed earlier and some of them appeared to disperse temporarily (i.e., exited the system for at least 14 consecutive days before returning). Larger fish were more likely to disperse before mid-October than smaller fish and may have moved to other estuaries or the inner continental shelf. Fish that dispersed after mid-October were more likely to return to the lagoon system the following spring than were fish that dispersed before mid-October. In 2008, fish returned to the system between 7 February and 7 April. Dispersals and returns most closely followed seasonal changes in mean water temperature, but photoperiod and other factors also may have played a role in large-scale movements of Summer Flounder.
    Keywords: Biology ; Ecology ; Fisheries
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    Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey (2021)
    In:  nate.bacheler@noaa.gov | http://aquaticcommons.org/id/eprint/14505 | 403 | 2014-02-13 18:36:35 | 14505 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Catch rates from fishery-independent surveys often are assumed to vary in proportion to the actual abundance of a population, but this approach assumes that the catchability coefficient (q) is constant. When fish accumulate in a gear, the rate at which the gear catches fish can decline, and, as a result, catch asymptotes and q declines with longer fishing times. We used data from long-term trap surveys (1990–2011) in the southeastern U.S. Atlantic to determine whether traps saturated for 8 reef fish species because of the amount of time traps soaked or the level of fish accumulation (the total number of individuals of all fish species caught in a trap). We used a delta-generalized-additive model to relate the catch of each species to a variety of predictor variables to determine how catch was influenced by soak time and fish accumulation after accounting for variability in catch due to the other predictor variables in the model. We found evidence of trap saturation for all 8 reef fish species examined. Traps became saturated for most species across the range of soak times examined, but trap saturation occurred for 3 fishspecies because of fish accumulation levels in the trap. Our results indicate that, to infer relative abundance levels from catch data, future studies should standardize catch or catch rates with nonlinear regression models that incorporate soak time, fish accumulation, and any other predictor variable that may ultimately influence catch. Determination of the exact mechanisms that cause trap saturation is a critical need for accurate stock assessment, and our results indicate that these mechanisms may vary considerably among species.
    Keywords: Biology ; Ecology ; Fisheries
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    Semblanzas Ictiológicas: Andrea Cecilia Hued (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), UNLP | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/14518 | 196 | 2015-05-30 00:20:56 | 14518 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-27
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota -Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: López, H. L. & J. Ponte Gómez. 2013. Semblanzas Ictiológicas: Andrea Cecilia Hued. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(15): 1-12. ISSN 1515 9329.
    Keywords: Biology ; Argentina ; Ichthyology - Ictiología ; Biographical sketchs - Semblanzas ; Andrea Cecilia Hued
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    Semblanzas Ictiológicas: Ricardo Jorge Casaux (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), UNLP | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/14517 | 196 | 2015-05-30 00:38:14 | 14517 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-27
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota -Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: López, H. L. & J. Ponte Gómez. 2013. Semblanzas Ictiológicas: Ricardo Jorge Casaux. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(13): 1-11. ISSN 1515 9329.
    Keywords: Biology ; Argentina ; Ichthyology - Ictiología ; Biographical sketchs - Semblanzas ; Argentina ; Ichthyology - Ictiología ; Biographical sketchs - Semblanzas ; Ricardo Jorge Casaux
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    Semblanzas Ictiológicas: Diego Oscar Nadalin (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), UNLP | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/14522 | 196 | 2015-05-30 00:24:41 | 14522 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-27
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota -Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: López, H. L. & J. Ponte Gómez. 2013. Semblanzas Ictiológicas: Diego Oscar Nadalin. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(19): 1-15. ISSN 1515 9329.
    Keywords: Biology ; Argentina ; Ichthyology - Ictiología ; Biographical sketchs - Semblanzas ; Diego Oscar Nadalin
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    Semblanzas Ictiológicas: Alicia Haydée Escalante (2021)
    Facultad de Ciencias Naturales y Museo (FCNyM), UNLP | La Plata, Argentina
    In:  hlopez@fcnym.unlp.edu.ar | http://aquaticcommons.org/id/eprint/14528 | 196 | 2015-05-30 00:20:21 | 14528 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Details
    Publication Date: 2021-06-27
    Description: A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”.El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos.Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.
    Description: ProBiota -Programa para el estudio y uso sustentable de la biota austral
    Description: Debe citarse: López, H. L. & J. Ponte Gómez. 2013. Semblanzas Ictiológicas: Alicia Haydée Escalante. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 21(25): 1-10. ISSN 1515 9329.
    Keywords: Biology ; Argentina ; Ichthyology - Ictiología ; Biographical sketchs - Semblanzas ; Alicia Haydée Escalante
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    Multiscale analysis of factors that affect the distribution of sharks throughout the northern Gulf of Mexico (2021)
    In:  mdrymon@disl.org | http://aquaticcommons.org/id/eprint/14532 | 403 | 2014-02-14 20:00:41 | 14532 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Identification of the spatial scale at which marine communities are organized is critical to proper management, yet this is particularly difficult to determine for highly migratory species like sharks. We used shark catch data collected during 2006–09 from fishery-independent bottom-longline surveys, as well as biotic and abiotic explanatory data to identify the factors that affect the distribution ofcoastal sharks at 2 spatial scales in the northern Gulf of Mexico. Centered principal component analyses (PCAs) were used to visualize the patterns that characterize shark distributions at small (Alabama and Mississippi coast) and large (northern Gulf of Mexico) spatial scales. Environmental data on temperature, salinity, dissolved oxygen (DO), depth, fish and crustacean biomass, and chlorophyll-a (chl-a) concentration were analyzed with normed PCAs at both spatial scales. The relationships between values of shark catch per unit of effort (CPUE) and environmental factors were then analyzed at each scale with co-inertia analysis (COIA). Results from COIA indicated that the degree of agreement between the structure of the environmental and shark data sets was relatively higher at the small spatial scale than at the large one. CPUE of Blacktip Shark (Carcharhinus limbatus) was related positively with crustacean biomass at both spatial scales. Similarly, CPUE of Atlantic Sharpnose Shark (Rhizoprionodonterraenovae) was related positively with chl-a concentrationand negatively with DO at both spatial scales. Conversely, distribution of Blacknose Shark (C. acronotus) displayed a contrasting relationship with depth at the 2 scales considered. Our results indicate that the factors influencing the distribution of sharks in the northern Gulf of Mexico are species specific but generally transcend the spatial boundaries used in our analyses.
    Keywords: Biology ; Ecology ; Fisheries
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    Population genetics of Cobia (Rachycentron canadum): implications for fishery management along the coast of the southeastern United States (2021)
    In:  dardent@dnr.sc.gov | http://aquaticcommons.org/id/eprint/14536 | 403 | 2014-02-14 22:10:01 | 14536 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Cobia (Rachycentron canadum) is a pelagic, migratory species with a transoceanic distribution in tropical and subtropical waters. Recreational fishing pressure on Cobia in the United States has increased substantially during the last decade, especially in areas of its annual inshore aggregations, making this species potentially susceptible to overfishing. Although Cobia along the Atlantic and Gulf coasts of the southeastern United States are currently managed as a single fishery, the genetic composition of Cobias in these areas is unclear. On the basis of a robust microsatellite data set from collections along the U.S. Atlantic coast (2008–09), offshore groups were genetically homogenous. However, the 2 sampled inshore aggregations (South Carolina and Virginia) were genetically distinct from each other, as well as from the offshore group. The recapture of stocked fish within their release estuary 2 years after release indicates that some degree of estuarine fidelity occurs within these inshore aggregations and supports the detection of their unique genetic structure at the population level. These results complement the observed high site fidelity of Cobias in South Carolina and support a recent study that confirms that Cobia spawn in the inshore aggregations. Our increased understanding of Cobia life history will be beneficial for determining the appropriate scale of fishery management for Cobia.
    Keywords: Biology ; Ecology ; Fisheries ; Management
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    Leaf growth of the seagrass Syringodium filiforme in outer Florida Bay, Florida (2021)
    In:  arthur@virginia.edu | http://aquaticcommons.org/id/eprint/14908 | 403 | 2014-03-11 22:34:30 | 14908 | United States National Ocean Service
    Details
    Publication Date: 2021-06-28
    Description: Leaf growth of the seagrass Syringodium filiforme (Kütz., 1860) was determined using a new technique based on the growth of emergent leaves (EL method) and compared to the more labor intensive repeated measurements (RM) and demographic allometric age reconstruction techniques (DA). All three techniques were used to compare leaf growth dynamics of plants with different morphologies at two sites, a shallow water (0.5 m) banktop and an adjacent deeper water (1.5 m) environment in outer Florida Bay, Florida. Leaf formation rates (Leaf Plastochrone Interval or PI) determined using the EL and RM methods were nearly identical, with means of 20 and 21 d leaf–1 at both sites, significantly faster than the 30 d leaf–1 calculated using the DA method. The EL method produced the highest estimate of leaf growth, 1.8 and 1.9 cm d–1 at the 0.5 m and 1.5 m sites, respectively, followed by the RM method (1.3 and 1.3 cm d–1) and the DA method (1.0 and 1.1 cm d–1). None of the methods detected differences in leaf PI, leaf growth or leaf fragmentation rates between sites. However, leaves at the 1.5 m site typically retained intact leaf tips longer than those at the 0.5 m site, and total leaf lifespan was longer at the 1.5 m site. Based on these results and the amount of field and laboratory work required by each of the methods, the new EL method is the preferred technique for monitoring leaf growth in S. filiforme.
    Keywords: Biology ; Ecology ; Management
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    The effects of size-selective fisheries on the stock dynamics of and sperm limitation in sex-changing fish (2021)
    In:  http://aquaticcommons.org/id/eprint/15027 | 403 | 2014-06-01 19:06:20 | 15027 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-01
    Description: Fisheries models have traditionally focused on patterns of growth, fecundity, and survival of fish. However, reproductive rates are the outcome of a variety of interconnected factors such as life-history strategies, mating patterns, population sex ratio, social interactions, and individual fecundity and fertility. Behaviorally appropriate models are necessary to understand stock dynamics and predict the success of management strategies. Protogynous sex-changing fish present a challenge for management because size-selective fisheries can drastically reduce reproductive rates. We present a general framework using an individual-based simulation model to determine the effect of life-history pattern, sperm production, mating system, and management strategy on stock dynamics. We apply this general approach to the specific question of how size-selective fisheries that remove mainly males will impact the stock dynamics of a protogynous population with fixed sex change compared to an otherwise identical dioecious population. In this dioecious population, we kept all aspects of the stock constant except for the pattern of sex determination (i.e. whether the species changes sex or is dioecious). Protogynous stocks with fixed sex change are predicted to be very sensitive to the size-selective fishing pattern. If all male size classes are fished, protogynous populations are predicted to crash even at relatively low fishing mortality. When some male size classes escape fishing, we predict that the mean population size of sex-changing stocks will decrease proportionally less than the mean population size of dioecious species experiencing the same fishing mortality. For protogynous species, spawning-per-recruit measures that ignore fertilization rates are not good indicators of the impact of fishing on the population. Decreased mating aggregation size is predicted to lead to an increased effect of sperm limitation at constant fishing mortality and effort. Marine protected areas have the potential to mitigate some effects of fishing on sperm limitation in sex-changing populations.
    Keywords: Biology ; Ecology ; Fisheries
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    Temporal and spatial aspects of bottlenose dolphin occurrence in coastal and estuarine waters near Charleston, South Carolina (2021)
    NOAA/National Ocean Service | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14611 | 403 | 2014-02-20 21:40:04 | 14611 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The spatial and temporal occurrence of Atlantic bottlenose dolphins (Tursiops truncatus) in the coastal and estuarine waters near Charleston, SC were evaluated. Sighting and photographic data from photo-identification (ID), remote biopsy, capture-release and radio-tracking studies, conducted from 1994 through 2003, were analyzed in order to further delineate residence patterns of Charleston area bottlenose dolphins. Data from 250 photo-ID, 106 remote biopsy, 15 capture-release and 83 radio-tracking surveys were collected in the Stono River Estuary (n = 247), Charleston Harbor (n = 86), North Edisto River (n = 54), Intracoastal Waterway (n = 26) and the coastal waters north and south of Charleston Harbor (n = 41). Coverage for all survey types was spatially and temporally variable, and in the case of biopsy, capture-release and radio-tracking surveys, data analyzed in this report were collected incidental to other research. Eight-hundred and thirty-nine individuals were photographically identified during the study period. One-hundred and fifteen (13.7%) of the 839 photographically identified individuals were sighted between 11-40 times, evidence of consistent occurrence in the Charleston area (i.e., site fidelity). Adjusted sighting proportions (ASP), which reflect an individual’s sighting frequency in a subarea relative to other subareas after adjusting for survey effort, were analyzed in order to evaluate dolphin spatial occurrence. Forty-three percent (n = 139) of dolphins that qualified for ASP analyses exhibited a strong subarea affiliationwhile the remaining 57% (n = 187) showed no strong subarea preference. Group size data were derived from field estimates of 2,342 dolphin groups encountered in the five Charleston subareas. Group size appeared positively correlated with degree of “openness” of the body of water where dolphins were encountered; and for sightings along the coast, group size was larger during summer months. This study provides valuable information on the complex nature of bottlenose dolphin spatial and temporal occurrence near Charleston, SC. In addition, it helps us to better understand the stock structure of dolphins along the Atlantic seaboard.
    Keywords: Biology ; Ecology ; Fisheries ; Management
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    Producción de juveniles del patao Eugerres brasilianus (Pisces, Gerreidae) en Santa Cruz del Sur, Camagüey. (2021)
    In:  alajonchere@gmail.com | http://aquaticcommons.org/id/eprint/14960 | 1545 | 2014-04-05 21:35:14 | 14960
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    Publication Date: 2021-06-29
    Keywords: Aquaculture
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    Time series analyses of biological and environmental variables for Suisun Bay and the Sacramento and San Joaquin rivers (2021)
    In:  http://aquaticcommons.org/id/eprint/15564 | 8 | 2014-11-06 00:57:26 | 15564
    Details
    Publication Date: 2021-07-08
    Description: EXTRACT (SEE PDF FOR FULL ABSTRACT):Arima analysis was used to compute cross-correlations between principal component axes that described environmental variables, chlorophyll concentration and zooplankton density for the Sacramento and San Joaquin rivers and Suisun Bay. ... Cross-correlations among the time series may provide information about links between environmental and biological variables within the estuary and the possible influence of climate.
    Keywords: Biology ; Environment ; Limnology ; Oceanography ; PACLIM
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    Impact of hatchery releases on the recreational fishery for Pacific threadfin (Polydactylus sexfilis) in Hawaii (2021)
    In:  http://aquaticcommons.org/id/eprint/15104 | 403 | 2014-05-28 03:41:12 | 15104 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: The Pacific threadfin (Polydactylus sexfilis) is considered one of the premier Hawaiian food fishes but even with catch limits, seasonal closures, and size limits, catches have declined dramatically since the 1960s. It was identified as the top candidate species for stock enhancement in Hawaii, based on the decline in stocks, high market value, and importance of the fishery.In the stock enhancement program for Pacific threadfin, over 430,000 fingerlings of various sizes were implanted with coded wire tags and released in nursery habitats along the windward coast of Oahu between 1993 and 1998. Because few Pacific threadfin were present in creel surveys conducted between 1994 and 1998, Oahu fishermen were offered a $10 reward for each threadfin that was caught (for both hatchery-reared and wild fish). A total of 1882 Pacific threadfin were recovered from the reward program between March 1998 and May 1999, including 163 hatchery-reared fish, an overall contribution of 8.7% to the fishery. Hatchery-reared fish accounted for as high as 71% of returns in the release areas. Hatchery-reared fish were recovered on average 11.5 km (SD=9.8 km) from the release site, although some had moved as far away as 42 km. Average age for recovered hatchery-reared fish was 495 days; the oldest was 1021 days.Cultured Pacific threadfin juveniles survived and recruited successfully to the recreational fishery, accounting for 10% of fishermen’s catches on the windward side of Oahu. Recruitment to the fishery was highest for the 1997 release year; few juveniles from earlier releases were observed. Presence of a few large, fully developed females in the recreational fishery suggested that hatchery-reared fish can survive, grow, and reproductively contribute to the population. Implementation of an enhancement program that is focused on juveniles and perhaps large females, as part of an integrated fishery management strategy, could speed the recovery of this fish population.
    Keywords: Aquaculture ; Fisheries ; Management
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    Biology and population dynamics of cowcod (Sebastes levis) in the southern California Bight (2021)
    In:  http://aquaticcommons.org/id/eprint/15122 | 403 | 2014-05-28 03:59:40 | 15122 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: Cowcod (Sebastes levis) is a large (100-cm-FL), long-lived (maximum observed age 55 yr) demersal rockfish taken in multispecies commercial and recreational fisheries offsouthern and central California. It lives at 20–500 m depth: adults (〉44 cm TL) inhabit rocky areas at 90–300 m and juveniles inhabit fine sand and clay at 40–100 m. Both sexes have similar growth and maturity. Both sexes recruit to the fishery before reaching full maturity. Based on age and growth data, the natural mortality rate is about M =0.055/yr, but the estimate is uncertain. Biomass, recruitment, and mortality during 1951–98 were estimated in a delay-difference model with catch data and abundance indices. The same model gave less precise estimates for 1916–50 based on catch data and assumptions about virgin biomass and recruitment such as used in stock reduction analysis. Abundance indices, based on rare event data, included a habitat-area–weighted index of recreationalcatch per unit of fishing effort (CPUE index values were 0.003–0.07 fish per angler hour), a standardizedindex of proportion of positive tows in CalCOFI ichthyoplankton survey data (binomial errors, 0–13% positivetows/yr), and proportion of positive tows for juveniles in bottom trawl surveys (binomial errors, 0–30% positive tows/yr). Cowcod are overfished in the southern California Bight; biomass during the 1998 season was about 7% of the virgin level and recent catches have been near 20 metric tons (t)/yr. Projections based on recent recruitment levels indicate that biomass will decline at catch levels 〉 5 t/yr. Trend data indicate that recruitment will be poor inthe near future. Recreational fishing effort in deep water has increased and has become more effective for catchingcowcod. Areas with relatively high catch rates for cowcod are fewer and are farther offshore. Cowcod die after captureand cannot be released alive. Two areas recently closed to bottom fishing will help rebuild the cowcod stock.
    Keywords: Biology ; Fisheries
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    Effects of blood extraction on horseshoe crabs (Limulus polyphemus) (2021)
    In:  http://aquaticcommons.org/id/eprint/15139 | 403 | 2014-05-23 00:04:39 | 15139 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: Horseshoe crabs (Limulus polyphemus) are caught by commercial fishermen for use as bait in eel and whelk fisheries (Berkson and Shuster, 1999)—fisheries with an annual economic value of $13 to $17 million (Manion et al.1). Horse-shoe crabs are ecologically important, as well (Walls et al., 2002). Migratory shorebirds rely on horseshoe crab eggs for food as they journey from South American wintering grounds to Arctic breeding grounds (Clark, 1996). Horse-shoe crabs are also essential for public health (Berkson and Shuster, 1999). Biomedical companies bleed horse-shoe crabs to extract a chemical used to detect the presence of endotoxins pathogenic to humans in injectable and implantable medical devices (Novitsky, 1984; Mikkelsen, 1988). Bled horseshoe crabs are returned to the wild, subject to the possibility of postbleeding mortality. Recent concerns of overharvesting have led to conflicts among commercial fishermen, environmentalists acting on behalf of the shorebirds, and biomedical companies (Berkson and Shuster, 1999; Walls et al., 2002).
    Keywords: Biology ; Chemistry ; Fisheries
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  • 78
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    Reproduction in the protogynous black grouper Mexico (Mycteroperca bonaci (Poey)) from the southern Gulf of Mexico (2021)
    In:  http://aquaticcommons.org/id/eprint/15140 | 403 | 2014-05-29 06:58:43 | 15140 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: An analysis was made of sexual pattern, spawning season, sizes at sexual maturation, and sex change in black grouper (Mycteroperca bonaci) from the southern Gulf of Mexico.Samples were taken between 1996 and 2000, from industrial and small-craft commercial fi sheries, in offshore andinshore waters of the continental shelf of the Yucatan Peninsula (Campeche Bank), including the shallow waters ofNational Marine Park Alacranes Reef. For all collected specimens (n=1229), sex and maturation condition weredetermined by histological analysis of the gonads. The offshore sample consisted of 75.1% females, 24.3% males,and 0.6% transitional-stage fish. All individuals collected from inshore waters were females. Gonadal structure and population structure characteristics for Campeche Bank black grouper were consistent with the characteristicsof monandric protogynous hermaphrodism for a serranid fish. Sexually active males and females were observed year-round,although ripening females, with stage-III, -IV, and -V vitellogenic oocytes in the ovaries, dominated in samplestaken between December and March. In addition, peak occurrence of ripe-running females with hyaline oocytesor postovulatory follicles (or both) in the ovaries was recorded in January and February. A few precocious femalesbegan spawning in October and November, and others were still in spawning condition in May and June. Fifty percentmaturity of females was attained at 72.1 cm fork length (FL). Median size at sexual inversion was 103.3 cm FL, and 50% of the females measuring 111.4 cm FL had transformed into males. The southern Gulf of Mexico grouper fisherywas considered deteriorated and lacked a well-defined management strategy. Results of the present study providehelpful information on black grouper reproduction in this area and could help Mexican authorities choose appropriatemanagement strategies for this fishery, such as minimum size limit, closed fishing season, and protection of spawning aggregations.
    Keywords: Biology ; Fisheries
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  • 79
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    Diets of thornback ray (Raja clavata) and tope shark (Galeorhinus galeus) in the bottom longline fishery of the Azores, northeastern Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/15149 | 403 | 2014-05-29 07:05:38 | 15149 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: Tope shark (Galeorhinus galeus) and thornback ray (Rajaclavata) are the two most captured elasmobranch species by the Azorean bottom longline fishery. In order to better understand the trophic dynamics of these species in the Azores, the diets of thornback ray and tope shark caught in this area during 1996 and 1997 were analyzed to describe feeding patterns and to investigate the effect of sex, size, and depth and area of capture on diet. Thornback rays fed mainly upon fishes and reptants, but also upon polychaetes, mysids, natant crustaceans, isopods, and cephalopods. In the Azores, this species preyed moreheavily upon fish compared with the predation patterns described in other areas. Differences in the diet may bedue to differences in the environments (e.g. in the Azores, seamounts and oceanic islands are the major topographicfeatures, whereas in all other studies, continental shelves have been the major topographic feature). No differenceswere observed in the major prey consumed between the sexes or between size classes (49−60, 61−70, 71−80, and 81−93 cm TL). Our study indicates that rays inhabiting different depths and areas (coastal or offshore banks) prey upon different resources. This appears to be related to the relative abundance of prey with habitat. Tope sharks werefound to prey almost exclusively upon teleost fish: small shoaling fish, mainly boarfish (Capros aper) and snipefish(Macroramphosus scolopax), were the most frequent prey. This study illustrates that thornback rays and tope sharks are top predators in waters off the Azores.
    Keywords: Biology ; Ecology ; Fisheries
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  • 80
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    Spawning cycles and habitats for ballyhoo (Hemiramphus brasiliensis) and balao (H. balao) in south Florida (2021)
    In:  http://aquaticcommons.org/id/eprint/15148 | 403 | 2014-05-29 07:05:04 | 15148 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: Two halfbeak species, ballyhoo (Hemiramphus brasiliensis) and balao (H. balao), are harvested as bait in south Florida waters, and recent changes in fishing effort and regulations prompted this investigation of the overlap of halfbeak fishing grounds and spawning grounds. Halfbeaks were sampled aboard commercial fishing vessels, and during fishery-independent trips, to determine spatial and temporalspawning patterns of both species. Cyclic patterns of gonadosomatic indices (GSIs) indicated that both species spawned during spring and summer months. Histological analysis demonstrated that specific stages of oocyte development can be predicted from GSI values; for example, female ballyhoo with GSIs 〉6.0 had hydrated oocytes that were 2.0−3.5 mm diameter. Diel changes in oocyte diameters and histological criteria demonstrated that final oocyte maturation occurred over a 30- to 36-hour period and that ballyhoo spawned at dusk. Hydration of oocytes began in the morning, and ovulation occurred at sunset of that same day;therefore females with hydrated oocytes were ready to spawn within hours. We compared maps of all locations where fish were collected to maps of locations where spawning females (i.e. females with GSIs 〉6.0) were collected to determinethe degree of overlap of halfbeak fishing and spawning grounds. We also used geographic information system (GIS) data to describe the depth and bottom type of halfbeak spawning grounds. Ballyhoo spawned all along the coral reef tract of the Atlantic Ocean, inshore of the reef tract, and in association with bank habitats within Florida Bay. In the Atlantic Ocean, balao spawned along the reef tract andin deeper, more offshore waters than did ballyhoo; balao were not found inshore of the coral reef tract or in FloridaBay. Both halfbeak species, considered together, spawned throughout the fishing grounds of south Florida.
    Keywords: Biology ; Ecology ; Fisheries
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  • 81
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    Genetic analysis of juvenile coho salmon (Oncorhynchus kisutch) off Oregon and Washington reveals few Columbia River wild fish (2021)
    In:  http://aquaticcommons.org/id/eprint/15153 | 403 | 2014-05-29 07:09:24 | 15153 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: Little is known about the ocean distributions of wild juvenile coho salmon off the Oregon-Washington coast. In this study we report tag recoveries and genetic mixed-stock estimates of juvenile fish caught in coastal waters near the Columbia River plume. To support the genetic estimates, we report an allozyme-frequency baseline for 89 wild and hatchery-reared coho salmon spawning populations, extending from northern California to southern British Columbia. The products of 59 allozyme-encoding loci were examined withstarch-gel electrophoresis. Of these, 56 loci were polymorphic, and 29 loci had P0.95 levels of polymorphism. Average heterozygosities within populations ranged from 0.021 to 0.046 and averaged 0.033. Multidimensional scaling of chord genetic distances between samples resolved nine regional groups that were sufficiently distinct for geneticmixed-stock analysis. About 2.9% of the total gene diversity was due to differences among populations within these regions, and 2.6% was due to differences among the nine regions. This allele-frequency data base was used to estimate the stock proportions of 730 juvenile coho salmon in offshore samples collected from central Oregon to northern Washington in June and September-October 1998−2000. Genetic mixed-stock analysis, together with recoveries of tagged or fin-clipped fish, indicates that about one half of the juveniles came from Columbia River hatcheries. Only 22% of the ocean-caught juveniles were wild fish, originating largely from coastal Oregon and Washington rivers (about 20%). Unlike previous studies of tagged juveniles, both tag recoveries and genetic estimates indicate the presence of fish from British Columbia andPuget Sound in southern waters. The most salient feature of genetic mixed stock estimates was the paucity of wildjuveniles from natural populations in the Columbia River Basin. This result reflects the large decrease in the abundances of these populations in the last few decades.
    Keywords: Biology ; Ecology ; Fisheries
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  • 82
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    Diving behavior of immature Steller sea lions (Eumetopias jubatus) (2021)
    In:  http://aquaticcommons.org/id/eprint/15147 | 403 | 2014-05-29 07:04:06 | 15147 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: Understanding the ontogenetic relationship between juvenileSteller sea lions (Eumetopias jubatus) and their foraging habitat is key to understanding their relationship toavailable prey and ultimately their survival. We summarize dive and movement data from 13 young-of-the-year (YOY) and 12 yearling Steller sea lions equipped with satellite dive recorders in the Gulf of Alaska and Aleutian Islands (n=18), and Washington (n=7) from 1994 to 2000. A total of 1413 d of transmission (x =56.5 d, range: 14.5–104.1 d) were received. We recorded 222,073 dives, which had a mean depth of 18.4 m (range of means: 5.8−67.9 m; SD=16.4). Alaska YOY dived for shorter periods and at shallower depths (mean depth=7.7 m, mean duration=0.8 min, mean maximum depth=25.7 m, and maximum depth=252 m) than Alaskayearlings (x =16.6 m, 0=1.1 min, x = 63.4 m, 288 m), whereas Washington yearlings dived the longest and deepest (mean depth=39.4 m, mean duration=1.8 min, mean maximumdepth=144.5 m, and maximum depth=328 m). Mean distance for 564 measured trips was 16.6 km; for sea lions ≤10 months of age, trip distance (7.0 km) was significantly less than for those 〉10 months of age (24.6 km). Mean trip duration for 10 of the 25 sea lions was 12.1 h; for sea lions ≤10 months of age, trip duration was 7.5 h and 18.1 h for those 〉10 months of age.We identified three movements types: long-range trips (〉15 km and 〉20 h), short-range trips (〈15 km and 〈20 h) during which the animals left and returned to the same site, and transits to other haul-out sites. Long-range trips started around 9 months of age and occurred most frequently aroundthe assumed time of weaning, whereas short-range trips happened almost daily (0.9 trips/day, n=426 trips). Transitsbegan as early as 7 months of age, occurred more often after 9 months of age, and ranged between 6.5 and 454 km. The change in dive characteristics coincided with the assumed onset of weaning. These yearling sea lion movementpatterns and dive characteristics suggest that immature Steller sea lions are as capable of making the same typesof movements as adults.
    Keywords: Biology ; Fisheries
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  • 83
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    The effects of docks on seagrasses, with particular emphasis on the threatened seagrass, Halophila johnsonii (2021)
    NOAA/Center for Coastal Fisheries and Habitat Research | Beaufort, NC
    In:  http://aquaticcommons.org/id/eprint/15156 | 403 | 2014-06-13 00:05:25 | 15156 | United States National Ocean Service
    Details
    Publication Date: 2021-07-03
    Description: In March of 2005, the National Oceanic and Atmospheric Administration's Special Projects Office released "Population Trends along the Coastal United States: 1980-2008." This report includes population changes and trends between 1980 and 2003 and projected changes in coastal populations by 2008. Given the findings, pressure on coastal resources around the country will continue to rise, particularly in Florida. ... One of our most valuable coastal resources is seagrass, but human desire and need to live on the coast means that our habitat overlaps with suitable seagrass habitat. Seagrasses can be found in coastal areas around the world but are limited to relatively shallow, relatively clear water because of their reliance on light for photosynthesis. Seagrasses provide food for both small and large marine organisms, larval and adult stage. They provide shelter and habitat to a variety of commercially important fish and invertebrates. They baffle the water column and inhibit the resuspension of sediments. They prevent erosion and fix and recycle nutrients. The physical and ecological benefits of seagrasses make them very important to human welfare, but their light-limited coastal distribution makes them highly susceptible to anthropogenic influences.
    Description: Report submitted to Protected Resources Division, National Marine Fisheries Service.
    Keywords: Biology ; Conservation ; Management
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    Type: monograph
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  • 84
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    Age and growth of the blue shark (Prionace glauca) in the North Atlantic Ocean (2021)
    In:  http://aquaticcommons.org/id/eprint/15152 | 403 | 2014-05-29 07:08:12 | 15152 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: Age and growth estimates for the blue shark (Prionace glauca) were derived from 411 vertebral centra and 43 tag-recaptured blue sharks collected in the North Atlantic, ranging in length from 49 to 312 cm fork length (FL). The vertebrae of two oxytetracycline-injected recaptured blue sharks support an annual spring deposition of growth bands in the vertebrae in sharks up to 192 cm FL. Males andfemales were aged to 16 and 15 years, respectively, and full maturity is attained by 5 years of age in both sexes.Both sexes grew similarly to age seven, when growth rates decreased in males and remained constant in females.Growth rates from tag-recaptured individuals agreed with those derived from vertebral annuli for smaller sharks but appeared overestimated for larger sharks. Von Bertalanffy growth parameters derived from vertebral length-at-age data are L∞ = 282 cm FL, K = 0.18, and t0 = –1.35 for males, andL∞ = 310 cm FL, K = 0.13, and t0 = −1.77 for females. The species grows faster and has a shorter life span than previously reported for these waters.
    Keywords: Biology ; Ecology ; Fisheries
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  • 85
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    Larvae of Dactylopsaron dimorphicum (Perciformes: Percophidae) from oceanic islands in the southeast Pacific (2021)
    In:  http://aquaticcommons.org/id/eprint/15158 | 403 | 2014-05-29 07:16:04 | 15158 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: Percophids are a family of small marine benthic fishes common over soft bottoms from inshore to the outer slopesin tropical to temperate regions of the Atlantic and in the Indo-West and southeast Pacific (Reader and Neira, 1998; Okiyama, 2000). Five species belonging to four genera have been recorded around the Salas y Gómez Ridge in the southeast Pacific, all of which are endemic to the area except for Chrionema chryseres, a species which also occurs off the Hawaiian Islands and Japan (Parin, 1985, 1990;Parin et al., 1997). Of these five species, larval stages have been described only for Osopsaron karlik and Chrionemapallidum (Belyanina 1989, 1990).
    Keywords: Biology ; Ecology ; Fisheries
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  • 86
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    Allozyme and RAPD variation in the eastern Pacific yellowfin tuna (Thunnus albacares) (2021)
    In:  http://aquaticcommons.org/id/eprint/15167 | 403 | 2014-05-29 07:25:02 | 15167 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Stock structure of eastern Pacific yellowfin tuna was investigated by analyzing allozymes and random amplified polymorphic DNAs (RAPDs) from 10 samples of 20–30 individuals each, collected between 1994 and 1996 from fishing vessels operating in the Inter-American Tropical Tuna Commission (IATTC) yellowfin regulatory area (CYRA). Allozyme analysis resolved 28 loci, eight of which were polymorphic under the 0.95 criterion: Aat-S*, Glud, Gpi-F*, Gpi-S*, La, Lgg, Pap-F*, and 6-Pgd, resulting in a mean heterozygosity over all allozyme loci of H = 0.052. Four polymorphic RAPD loci were selected for analysis, resulting in a mean heterozygosity of H = 0.43. Eight of 45 pairwise comparisons of allozyme allele frequencies among the ten samples showed significant differences after correction for multiple testing (P〈0.0001), all of which involved comparisons with the Gulf of California sample. Confirmation of this signal of population structure would have management implications. No significant divergence in RAPD allele frequencies was observed among samples. Weir and Cockerham θ estimated for allozyme loci (θ=0.048; P〈0.05) and RAPD loci (θ=0.030; P〉0.05) revealed little population structure among samples. Mantel tests demonstrated that the genetic relationships among samples did not correspond to an isolation-by-distance model for either class of marker. Four of eight comparisons of coastal and offshore samples revealed differences of allele frequencies at the Gpi-F* locus (P〈0.05), although none of these differences was significant after correction for multiple testing (P〉0.001). Results are consistent with the hypothesis that the CYRA yellowfin tuna samples comprise a single genetic stock, although gene flow appears to be greater among coastal samples than between coastal and offshore samples.
    Keywords: Biology ; Fisheries
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  • 87
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    Estimates of survival probabilities for oceanic-stage loggerhead sea turtles (Caretta caretta) in the North Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/15163 | 403 | 2014-05-29 07:21:13 | 15163 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Description: Estimates of instantaneous mortality rates (Z) and annual apparent survival probabilities (Φ) were generated from catch-curve analyses for oceanic-stage juvenile loggerheads (Caretta caretta) in the waters of the Azores. Two age distributions were analyzed: the “total sample” of 1600 loggerheads primarily captured by sighting and dipnetting from a variety of vessels in the Azores between 1984 and 1995 and the “tuna sample” of 733 loggerheads (a subset of the total sample) captured by sighting and dipnetting from vessels in the commercial tuna fleet in the Azores between 1990 and 1992. Because loggerhead sea turtles begin to emigrate from oceanic to neritic habitats at age 7, the best estimates of instantaneous mortality rate (0.094) and annual survival probability (0.911) not confounded with permanent emigration were generated for age classes 2 through 6. These estimates must be interpreted with caution because of the assumptions upon which catch-curve analyses are based. However, these are the first directly derived estimates of mortality and survival probabilities for oceanic-stage sea turtles. Estimation of survival probabilities was identified as “an immediate and critical requirement” in 2000 by the Turtle Expert Working Group of the U.S. National Marine Fisheries Service.
    Keywords: Biology ; Fisheries ; Management
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  • 88
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    Age and growth of blue rockfish (Sebastes mystinus) from central and northern California (2021)
    In:  http://aquaticcommons.org/id/eprint/15170 | 403 | 2014-05-29 07:32:32 | 15170 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Otoliths from blue rockfish (Sebastes mystinus), were aged by using a combination of surface and break-and-burn methods. The samples were collected between 1978 and 1998 off central and northern California. Annual growth increments in the otoliths were validated by using edge analysis for females up to age 23 and for males to age 25.The first annual growth increment was identified by comparing the diameter of the otolith from fish known to be one year old collected in May (when translucent zone formation was completed) to the mean diameter of the first translucent zone in the otoliths from older fish. Our estimated maxi-mum ages of 44 years for males and 41 years for females were much older than those reported in previous studies. Von Bertalanffy growth models were developed for each sex. Females grew faster and reached larger maximum length than males. The growth models were similar to those generated in other studies of this species in southern and central California. Fish from northern and central California had similar maximum sizes, maximum ages, and growth model parameters.
    Keywords: Biology ; Ecology ; Fisheries
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  • 89
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    Fecundity and spawning season of striped mullet (Mugil cephalus L.) in South Carolina estuaries (2021)
    In:  http://aquaticcommons.org/id/eprint/15172 | 403 | 2014-05-29 07:39:49 | 15172 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Fecundity in striped mullet (Mugil cephalus) from South Carolina correlated highly with length and weight, but not with age. Oocyte counts ranged from 4.47 × 105 to 2.52 × 106 in 1998 for fish ranging in size from 331 mm to 600 mm total length, 2.13 × 105to 3.89 × 106in 1999 for fish ranging in size from 332 mm to 588 mm total length, and 3.89 × 105 to 3.01 × 106 in 2000 for fish ranging in size from 325 mm to 592 mm total length. The striped mullet in this study had a high degree of variability in the size-at-age relation-ship; this variability was indicative of varied growth rates and compounded the errors in estimating fecundity at age. The stronger relationship of fecundity to fish size allowed a much better predictive model for potential fecundity in striped mullet. By comparing fecundity with other measures of reproductive activity, such as the gonadosomatic index, histological examination, and the measurement of mean oocyte diameters, we determined that none of these methods by themselves were adequate to determine the extent of reproductive development. Histological examinations and oocyte diameter measurements revealed that fecundity counts could be made once developing oocytes reached 0.400 μm or larger. Striped mullet are isochronal spawners; therefore fecundity estimates for this species are easier to determine because oocytes develop at approximately the same rate upon reaching 400 μm. This uniform development made oocytes that were to be spawned easier to count. When fecundity counts were used in conjunction with histological examination, oocyte diameter measurements, and gonadosomatic index, a more complete measure of reproductive potential and the timing of the spawning season was possible. In addition, it was determined that striped mullet that recruit into South Carolina estuaries spawn from October through April.
    Keywords: Biology ; Ecology ; Fisheries
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  • 90
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    The early life history of swordfish (Xiphias gladius) in the western North Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/15168 | 403 | 2014-05-29 07:25:58 | 15168 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Lengths and ages of sword-fish (Xiphias gladius) estimated from increments on otoliths of larvae collected in the Caribbean Sea, Florida Straits, and off the southeastern United States, indicated two growth phases. Larvae complete yolk and oil globule absorption 5 to 6 days after hatching (DAH). Larvae 〈13 mm preserved standard length (PSL) grow slowly (~0.3 mm/d); larvae from 13 to 115 mm PSL grow rapidly (~6 mm/d). The acceleration in growth rate at 13 days follows an abrupt (within 3 days) change in diet, and in jaw and alimentary canal structure. The diet of swordfish larvae is limited. Larvae 〈8 mm PSL from the Caribbean, Gulf of Mexico, and off the southeastern United States eat exclusively copepods, primarily of one genus, Corycaeus. Larvae 9 to 11 mm eat copepods and chaetognaths; larvae 〉11 mm eat exclusively neustonic fish larvae. This diet indicates that young larvae 〈11 mm occupy the near-surface pelagia, whereas, older and longer larvae are neustonic. Spawning dates for larvae collected in various regions of the western North Atlantic, along with the abundance and spatial distribution of the youngest larvae, indicate that spawning peaks in three seasons and in five regions. Swordfish spawn in the Caribbean Sea, or possibly to the east, in winter, and in the western Gulf of Mexico in spring. Elsewhere swordfish spawn year-round, but spawning peaks in the spring in the north-central Gulf of Mexico, in the summer off southern Florida, and in the spring and early summer off the southeastern United States. The western Gulf Stream frontal zone is the focus of spawning off the southeastern coast of the United States, whereas spawning in the Gulf of Mexico seems to be focused in the vicinity of the Gulf Loop Current. Larvae may use the Gulf of Mexico and the outer continental shelf off the east coast of the United States as nursery areas. Some larvae may be transported northward, but trans-Atlantic transport of larvae is unlikely.
    Keywords: Biology ; Fisheries
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  • 91
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    Reproductive biology of the blue swimmer crab (Portunus pelagicus, Decapoda: Portunidae) in five bodies of water on the west coast of Australia (2021)
    In:  http://aquaticcommons.org/id/eprint/15165 | 403 | 2014-05-29 07:23:08 | 15165 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-04
    Description: Portunus pelagicus was collected at regular intervals from two marine embayments and two estuaries on the lower west coast of Australia and from a large embayment located approximately 800 km farther north. The samples were used to obtain data on the reproductive biology of this species in three very different environments. Unlike females, the males show a loosening of the attachment of the abdominal flap to the cephalothorax at a prepubertal rather than a pubertal molt. Males become gonadally mature (spermatophores and seminal fluid present in the medial region of the vas deferentia) at a very similar carapace width (CW) to that at which they achieve morphometric maturity, as reflected by a change in the relative size of the largest cheliped. Logistic curves, derived from the prevalence of mature male P. pelagicus, generally had wider confidence limits with morphometric than with gonadal data. This presumably reflects the fact that the morphometric (allometric) method of classifying a male P. pelagicus as mature employs probabilities and is thus indirect, whereas gonadal structure allows a mature male to be readily identified. However, the very close correspondence between the CW50’s derived for P. pelagicus by the two methods implies that either method can be used for management purposes. Portunus pelagicus attained maturity at a significantly greater size in the large embayment than in the four more southern bodies of water, where water temperatures were lower and the densities of crabs and fishing pressure were greater. As a result of the emigration of mature female P. pelagicus from estuaries, the CW50’s derived by using the prevalence of mature females in estuaries represent overestimates for those populations as a whole. Estimates of the number of egg batches produced in a spawning season ranged from one in small crabs to three in large crabs. These data, together with the batch fecundities of different size crabs, indicate that the estimated number of eggs produced by P. pelagicus during the spawning season ranges from about 78,000 in small crabs (CW=80 mm) to about 1,000,000 in large crabs (CW=180 mm).
    Keywords: Biology ; Fisheries
    Repository Name: AquaDocs
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  • 92
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    Reproduction and recruitment of white mullet (Mugil curema) to a tropical lagoon (Margarita Island, Venezuela) as revealed by otolith microstructure (2021)
    In:  http://aquaticcommons.org/id/eprint/15171 | 403 | 2014-05-29 07:39:21 | 15171 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: The reproductive activity and recruitment of white mullet (Mugil curema) was determined by observations of gonad development and coastal juvenile abundance from March 1992 to July 1993. Adults were collected from commercial catches at three sites in northeastern Venezuelan waters. Spawning time was determined from the observation of macroscopic gonadal stages. Coastal recruitment was determined from fish samples collected biweekly by seining in La Restinga Lagoon, Margarita Island, Venezuela. The examination of daily growth rings on the otoliths of coastal recruits was used to determine their birth date and estimate the period of successful spawning. Fish with mature gonads were present throughout the year but were less frequent between September and January when spawning individuals migrated offshore. In both years, juvenile recruitment to the lagoon was highest between March and June when high densities of 25–35 mm juveniles were observed. Back-calculated hatching-date frequency distributions revealed maximum levels of successful spawning in December–January that were significantly correlated with periods of enhanced upwelling. The relation between the timing of successful spawning and the intensity of coastal recruitment in white mullet was likely due to variations in food availability for first-feeding larvae as well as to variations in the duration of the transport of larvae shoreward as a result of varying current conditions associated with upwelling.
    Keywords: Biology ; Fisheries ; Management
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  • 93
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    The physiological effects of multiple forced submergences in loggerhead sea turtles (Caretta caretta) (2021)
    In:  http://aquaticcommons.org/id/eprint/15177 | 403 | 2014-05-29 07:45:12 | 15177 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Sea turtles are subjected to involuntary submergence and potential mortality due to incidental capture by the commercial shrimp fishing industry. Despite implementation of turtle excluder devices (TEDs) to reduce at-sea mortality, dead stranded turtles continue to be found in near-record numbers along the coasts of the western Atlantic Ocean and northern Gulf of Mexico. Although this mortality may be due to an increase in the number of turtles available to strand, one alternative explanation is that sea turtles are repetitively submerged (as one fishing vessel follows the path of another) in legal TEDs. In the present study, laboratory and field investigations were undertaken to examine the physiological effects of multiple submergence of loggerhead sea turtles (Caretta caretta). Turtles in the laboratory study were confined during the submersion episodes, whereas under field conditions, turtles were released directly into TED-equipped commercial fishing nets. Under laboratory and field conditions, pre- and postsubmergence blood samples were collected from turtles submerged three times at 7.5 min per episode with an in-water rest interval of 10, 42, or 180 min between submergences. Analyses of pre- and postsubmergence blood samples revealed that the initial submergence produced a severe and pronounced metabolic and respiratory acidosis in all turtles. Successive submergences produced significant changes in blood pH, Pco2, and lactate, although the magnitude of the acid-base imbalance was substantially reduced as the number of submergences increased. In addition, increasing the interval between successive submergences permitted greater recovery of blood homeostasis. No turtles died during these studies. Taken together, these data suggest that repetitive sub-mergence of sea turtles in TEDs would not significantly affect their survival potential provided that the animal has an adequate rest interval at the surface between successive submergences.
    Keywords: Biology ; Fisheries ; Management
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  • 94
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    Quantitative determination of the timing of otolith ring formation from marginal increments in four marine teleost species from northwestern Australia (2021)
    In:  http://aquaticcommons.org/id/eprint/15178 | 403 | 2014-05-29 07:46:20 | 15178 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: The sectioned otoliths of four fish species from a tropical demersal trawl fishery in Western Australia revealed a series of alternating trans-lucent and opaque zones in reflected light. The translucent zones, referred to as growth rings, were counted to determine fish ages. The width of the opaque zone on the periphery of the otolith section as a proportion of the width of the previous opaque zone (index of completion) was used to determine the periodicity of growth-ring formation.This article describes a method for modeling changes in the index of ring completion over time, from which a parameter for the most probable time of growth-ring formation (with confidence intervals) can be determined. The parameter estimate for the timing of new growth-ring formation for Lethrinus sp. 3 was from mid July to mid September, for Lutjanus vitta from early July to the end of August, for Nemipterus furcosus from mid July to late September, and for Lutjanus sebae from mid July to mid November. The confidence intervals for the timing of formation of growth rings was variable between species, being smallest for L. vitta, and variable between fish of the same species with different numbers of growth rings.The stock assessments of these commercially important species relies on aging information for all the age classes used in the assessment. This study demonstrated that growth rings on sectioned otoliths were laid down annually, irrespective of the number of growth rings, and also demonstrated that the timing of ring formation for these tropical species can be determined quantitatively (with confidence intervals.
    Keywords: Biology ; Ecology ; Fisheries
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    Application of DNA-based techniques for the identification of whaler sharks (Carcharhinus spp.) caught in protective beach meshing and by recreational fisheries off the coast of New South Wales (2021)
    In:  http://aquaticcommons.org/id/eprint/15179 | 403 | 2014-05-29 07:48:40 | 15179 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Keywords: Biology ; Chemistry ; Fisheries ; Management
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  • 96
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    Local distribution and abundance of swimming crabs (Callinectes spp. and Arenaeus cribrarius) on a tropical arid beach (2021)
    In:  http://aquaticcommons.org/id/eprint/15185 | 403 | 2014-05-30 07:02:11 | 15185 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Distribution, abundance, and several population features were studied in Ensenada de La Vela (Venezuela) between 1993 and 1998 as a first step in the assessment of local fisheries of swimming crabs. Arenaeus cribrarius was the most abundant species at the marine foreshore. Callinectes danae prevailed at the estuarine location. Callinectes bocourti was the most abundant species at the offshore. Abundances of A. cribrarius and C. danae fluctuated widely and randomly. Ovigerous females were almost absent. Adults of several species were smaller than previously reported. This study suggests that fisheries based on these swimming crabs probably will be restricted to an artisanal level because abundances appear too low to support industrial exploitation.
    Keywords: Biology ; Ecology ; Fisheries
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  • 97
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    The use of agreement measures and latent class models to assess the reliability of classifying thermally marked otoliths (2021)
    In:  http://aquaticcommons.org/id/eprint/15184 | 403 | 2014-05-29 07:55:35 | 15184 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: Otolith thermal marking is an efficient method for mass marking hatchery-reared salmon and can be used to estimate the proportion of hatchery fish captured in a mixed-stock fishery. Accuracy of the thermal pattern classification depends on the prominence of the pattern, the methods used to prepare and view the patterns, and the training and experience of the personnel who determine the presence or absence of a particular pattern. Estimating accuracy rates is problematic when no secondary marking is available and no error-free standards exist. Agreement measures, such as kappa (κ), provide a relative measure of the reliability of the determinations when independent readings by two readers are available, but the magnitude of κ can be influenced by the proportion of marked fish. If a third reader is used or if two or more groups of paired readings are examined, latent class models can provide estimates of the error rates of each reader. Applications of κ and latent class models are illustrated by a program providing contribution estimates of hatchery-reared chum and sockeye salmon in Southeast Alaska.
    Keywords: Biology ; Chemistry ; Fisheries
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  • 98
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    Estimated ages of red porgy (Pagrus pagrus) from fishery-dependent and fishery-independent data and a comparison of growth parameters (2021)
    In:  http://aquaticcommons.org/id/eprint/15192 | 403 | 2014-05-30 07:12:21 | 15192 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: The red porgy, Pagrus pagrus, is an important reef fish in several offshore fisheries along the southeastern United States. We examined samples from North Carolina through southeast Florida from recreational (headboat) and commercial (hook and line) fisheries, as well as samples from a fishery-independent source. Red porgy attain a maximum age of at least 18 years and 733 mm total length. The weight-length relationship is represented by the ln-ln transformed equation: W = 8.85 × 10–6(L)3.06, where W = whole weight in grams, and L = total length in mm. The von Bertalanffy growth equation fitted to the most recent, back-calculated lengths from all the samples is Lt = 644(1 – e –0.15(t + 0.76)). Our study revealed a difference in mean length at age of red porgy from the three sources. Red porgy in fishery-independent collections were smaller at age than specimens examined from fishery-dependent sources. The difference in length-at-age may be related to gear selectivity and have important consequences in the assessment of fish stocks.
    Keywords: Biology ; Fisheries ; Management
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  • 99
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    Population status, seasonal variation in abundance, and long-term population trends of Steller sea lions (Eumetopias jubatus) at the South Farallon Islands, California (2021)
    In:  http://aquaticcommons.org/id/eprint/15189 | 403 | 2014-05-30 07:07:59 | 15189 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: We examined seasonal and annual variation in numbers of Steller (northern) sea lions (Eumetopias jubatus) at the South Farallon Islands from counts conducted weekly from 1974 to 1996. Numbers of adult and subadult males peaked during the breeding season (May–July), whereas numbers of adult females and immature individuals peaked during the breeding season and from late fall through early winter (September–December). The seasonal pattern varied significantly among years for all sexes and age classes. From 1977 to 1996, numbers present during the breeding season decreased by 5.9% per year for adult females and increased by 1.9% per year for subadult males. No trend in numbers of adult males was detected. Numbers of immature individuals also declined by 4.5% per year during the breeding season but increased by 5.0% per year from late fall through early winter. Maximum number of pups counted declined significantly through time, although few pups were produced at the South Farallon Islands. The ratio of adult females to adult males averaged 5.2:1 and declined significantly with each year, whereas no trend in the ratio of pups to adult females was discernible. Further studies are needed to determine if reduced numbers of adult females in recent years have resulted from reduced survival of juvenile or adult females or from changes in the geographic distribution of females.
    Keywords: Biology ; Fisheries ; Management
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  • 100
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    Abundance of horseshoe crabs (Limulus polyphemus) in the Delaware Bay area (2021)
    In:  http://aquaticcommons.org/id/eprint/15182 | 403 | 2014-05-29 07:51:48 | 15182 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-04
    Description: In recent years, increasing commercial landings of horseshoe crabs (Limulus polyphemus) along the Atlantic coast of the United States have raised concerns that the present resource is in decline and insufficient to support the needs of its user groups. These concerns have led the Atlantic States Marine Fisheries Commission (ASMFC) to implement a fishery management plan to regulate the harvest (ASMFC1). In order to properly manage any species, specific management goals and objectives must be established, and these goals depend on the resource users involved (Quinn and Deriso, 1999). Horseshoe crabs present a distinct resource management challenge because they are important to a diverse set of users (Berkson and Shuster, 1999).
    Keywords: Biology ; Ecology ; Fisheries
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    Format: 933-938
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