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  • Inorganic Chemistry  (83,670)
  • Fisheries  (13,756)
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  • 101
    Publication Date: 2018-03-15
    Description: The fisheries and coastal resources policy of Indonesia requires a specific operational and regulatory framework to ensure the the protection of traditional small-scale fishers
    Keywords: Fisheries
    Repository Name: Aquatic Commons
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  • 102
    Publication Date: 2018-03-15
    Description: A critical look at Towards Gender-equitable Small-scale fisheries Governance and Development: A Handbook by Nilanjana Biswas, published by the FAO, in 2017
    Keywords: Fisheries
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  • 103
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    Publication Date: 2018-03-15
    Keywords: Fisheries
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  • 104
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    Publication Date: 2018-03-19
    Keywords: Fisheries
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  • 105
    Publication Date: 2018-03-19
    Description: Taking a road less travelled is not easy. Sometimes the whole of society stands against you. But no such fear deterred Rekha K.C. of Koorkenchery, a village in the Thrissur district of Kerala, India, the first woman in the country to go fishing in the deep waters of the outer sea. Amidst prevailing social stigmas, 45-year-old Rekha has been fishing in these waters with her husband Karthikeyan for ten years. “Although the sea is considered mother and goddess, our society forbids a woman from entering the sea,” she says. “I faced strong opposition...they even said it would destroy the sea. There were even times when our nets were damaged,” she adds.
    Keywords: Fisheries ; Sociology
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  • 106
    Publication Date: 2018-03-19
    Keywords: Fisheries ; Sociology
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  • 107
    Publication Date: 2018-03-19
    Description: A newly established network of women fish processors and traders promises to improve the prospects of women in Africa’s post-harvest sector
    Keywords: Fisheries
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  • 108
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    Publication Date: 2018-03-19
    Description: The Caribbean Network of Fisherfolk Organisations works on the implementation of the SSF Guidelines with a special focus on gender
    Keywords: Fisheries ; Sociology
    Repository Name: Aquatic Commons
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  • 109
    Publication Date: 2018-03-19
    Keywords: Fisheries ; Information Management
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  • 110
    Publication Date: 2018-03-19
    Description: Women and men in fishing communities in South India work together to generate important beach related data
    Keywords: Fisheries
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  • 111
    Publication Date: 2018-03-19
    Description: Twenty-five years after the introduction of the quota system, significant challenges confront women in Norway’s fisheries
    Keywords: Fisheries ; Sociology
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  • 112
    Publication Date: 2018-03-19
    Description: Twenty years of organising by women in Europe’s fisheries have led to important gains, challenges and opportunities.
    Keywords: Fisheries ; Sociology
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  • 113
    Publication Date: 2018-03-19
    Description: The Indian poet, Bhupen Hazarika’s soul-stirring composition ‘O Ganga Boicho Keno (Oh Ganges, why do you flow?),’ inspired by Paul Robeson’s “Ol’ Man River”, plays as we see footage of communities facing irrecoverable loss of their homes, lands and assets by an aggressively advancing river.Women at the Water’s Edge is a film shot on Mousuni, one of the 54 inhabited islands of the Sundarbans delta in West Bengal, India.
    Keywords: Fisheries ; Sociology
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  • 114
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    International Collective in Support of Fishworkers
    Publication Date: 2018-09-10
    Description: Between 29 November and 3 December, 2017, Cyclone Ockhi devastated hundreds of lives and livelihoods of coastal fishing communities in Kerala and Tamil Nadu, India. This study assesses the impacts of the cyclone on fishing communities and the mechanisms in place at the local, national and international levels to address disaster risks and sea safety in small-scale fisheries, using a human rights-based approach. In line with the Sendai Framework 2015-2030 and the Voluntary Guidelines for Securing Sustainable Small-scale Fisheries, the study recommends applying “relief-development continuum” and “build back better” concepts to the management of disaster risks in order to save lives and to reduce damage to fisheries assets and livelihoods.
    Keywords: Environment ; Fisheries ; Sociology
    Repository Name: Aquatic Commons
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  • 115
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    Publication Date: 2018-10-11
    Description: As the implementation of the SSF Guidelines gets under way, it is imperative to lobby for policies and processes that will empower small-scale fishing communities. The Thirty-third Session of the Committee on Fisheries (COFI) of the Food and Agriculture Organization of the United Nations (FAO), held in Rome in July 2018, proved to be a watershed for small-scale fisheries.
    Keywords: Fisheries ; Policies ; Sociology
    Repository Name: Aquatic Commons
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  • 116
    Publication Date: 2018-10-19
    Description: The purpose of this study was to find some important biological aspects of Thunnus tonggol in coastal waters of Hormozgan Province (Persian Gulf and Oman Sea). A total monthly data of 4383 individuals ranging from 25 to 124 cm fork length were collected from April 2015 to March 2016. The data were analyzed with FiSAT II software using the ELEFAN1 package to estimate the population parameters. The length-weight relationship was TW=0.00002 FL^2.87 (R^2 =0.97) showing an isometric growth for T. tonggol. Growth parameters were computed as L∞=129.6 cm, K=0.39 year^-1 and t0=−0.28 with the growth performance index, φ’ of 8.7. The total mortality (Z) was estimated 1.58 year^-1 using catch curve method. The natural (M) and fishing mortality (Fcurr) were obtained 0.49 and 1.09 year^-1, respectively. The exploitation ratio was 0.69. Length at first capture (Lc) was estimated as 60.2 cm fork length. The yield per recruit (Y/R) maximized in maximum fishing mortality rate 0.85 year^-1. The biomass per recruit decreased to 17.2% of unexploited biomass (virgin biomass) at Fcurr. The current fishing mortality exceeds optimum fishing mortality (Fopt) and limit fishing mortality (F limit) as biological reference points. The results indicated that population of T. tonggol is overexploited in the Persian Gulf and Oman Sea and there no further scope for improving the exploitation of this species.
    Keywords: Fisheries
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  • 117
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    Publication Date: 2019-01-08
    Description: The Regional Plan of Action for Small-scale Fisheries in the Mediterranean and the Black Sea is a model for other regional fisheries management organizations. For the first time since the endorsement of the Voluntary Guidelines for Securing Sustainable Small-scale Fisheries in the context of Food Security and Poverty Eradication (the SSF Guidelines) in Rome in June 2014, a regional fisheries body has adopted a plan of action for sustainable small-scale fisheries that draws upon these Guidelines and other instruments.
    Keywords: Fisheries
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  • 118
    Publication Date: 2018-10-19
    Description: In this study, the effects of Tarragon and Savory essential oils on oxidative stability of ready-to-eat shrimp (Metapenaeus stebbingi) during three months at frozen storage were investigated. Samples were treated with Tarragon and Savory essential oils and cooked by different cooking methods (frying, oven baking and steaming). Butylated hydroxytoluene (BHT) was used as a reference to compare antioxidant activities. During frozen storage, fat hydrolysis was evaluated through measuring free fatty acid value and oxidation products were measured via peroxide value and thiobarbutiric resistance substance. At the end of storage, the highest amount of free fatty acids (following the control) was observed in steamed savory treated samples (3.2% oleic acid) and the lowest amount in Savory and Ttarragon fried samples (1.11 and 1.75% oleic acid). Following BHT, the lowest amount of peroxide value was obtained from steamed shrimps treated with tarragon (0.92 meq/kg of fat). Also, thiobarbutiric acid values in fried and oven baked samples containing Savory essential oil (0.55 and 0.42 mg MA/kg of fat) was higher than samples containing Tarragon essential oil (0.44 and 0.38 mg MA/kg of fat). The results of the present study indicated that Tarragon and Savory essential oils retarded the oxidation and samples treated with Tarragon essential oil showed slower hydroperoxide and malonaldehyde formation than those of Savory-treated or the untreated samples. The best storage period of the fried, oven baked and steamed products treated with Tarragon and Savory were 1, 2 and 3 months, respectively.
    Keywords: Fisheries
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  • 119
    Publication Date: 2019-01-08
    Description: Cambodia’s community fisheries initiative is the most extensive and well-developed system of community fisheries in the world. The current fishery rights system in Cambodia is the most extensive and well-developed system of community fisheries in the world”, said the European Union (EU) Representative to Cambodia at the FAO/UN User Rights 2015 Conference held in Siem Reap, Cambodia. Defining tenurial boundaries and proving rights in an aquatic milieu is a daunting task. This is further confounded when dealing with a dynamic land-water interface marked by significant seasonal fluctuations.
    Keywords: Aquaculture ; Fisheries
    Repository Name: Aquatic Commons
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  • 120
    Publication Date: 2019-01-08
    Description: Can the Ministerial declaration and regional plan of action signed recently in Malta turn the tide of fortune for small-scale fisheries in the Mediterranean and Black Sea?. On 26 September in Malta, 18 Mediterranean and Black Sea coastal states committed themselves to developing “objectives, principles and concrete actions” to be applied across the region through a regional plan of action (RPOA) and thus “to ensure the long-term environmental, economic and social sustainability of small-scale fisheries”.
    Keywords: Fisheries
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  • 121
    Publication Date: 2019-03-27
    Description: New research exploring women’s roles in fishing families officially got going in August 2018, with the launch of the new Women in Fisheries project website. This research examines how women contribute to the survival of both fishing families and the fishing industry, and will shed light on women’s roles, identities and well-being.
    Keywords: Fisheries
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  • 122
    Publication Date: 2019-03-26
    Description: A World Bank-funded project for 12 countries in the East African and Indian Ocean regions attempts to allow fishers to maximize revenue but not deplete stocks. This interview took place on the sidelines of the Second Regional Workshop on Monitoring, Control and Surveillance, organized by the Bay of Bengal Programme, Inter- Governmental Organisation in Chennai during 3 - 4 October 2018.
    Keywords: Fisheries
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  • 123
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    Publication Date: 2019-03-27
    Description: A review of the documentary film about women fishers living in the floating villages of Tonle Sap Lake, Cambodia, considered the world’s most productive inland fishery. Produced by Conservation International and Fintrac; filmed and edited by Dominique Tardy, scripted by Olivier Joffre and narrated by Susan Novak. Duration 12 min 29 sec; Language: English.
    Keywords: Environment ; Fisheries
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  • 124
    Publication Date: 2019-03-27
    Description: Meet Alejandra and Maria Elena, women fishers from Mexico’s Lake Chapala region, whose work contradicts the belief that fishing is something that only men can do
    Keywords: Environment ; Fisheries
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  • 125
    Publication Date: 2019-04-24
    Keywords: Biology ; Ecology ; Fisheries
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  • 126
    Publication Date: 2018-10-11
    Description: An FAO project examines global occupational health and safety policies, practices, standards, problems and challenges in aquaculture occupational safety and health (AOSH).
    Keywords: Aquaculture ; Fisheries ; Policies
    Repository Name: Aquatic Commons
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  • 127
    Publication Date: 2018-10-11
    Description: The Guaranis, indigenous people of Morro dos Cavalos in Brazil, are being displaced from their lands to satisfy the interests of politicians and businesses.
    Keywords: Fisheries ; Policies ; Sociology
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  • 128
    Publication Date: 2018-10-19
    Description: The aim of this study was to determine the qualitative characteristics of ready-made fish paste made from minced meat (Clupeonella cultriventris) and silver carp (Hypophthalmichthys molitrix) and its shelf-life at a refrigerated temperature.This compilation was performed in five treatments including amounts 100, 75, 50 and 25 percent of processed fish meat were cured. The treatments were packed in heat-resistant glass after pasteurization. Samples were stored at 4oC for 40 days.The amount of TVB-N in the experimental treatments during the course of the change was increased that this factor varied between15.25-31.25 mg/100 g of meat in experimental treatments. This factor was in the 100% rolled silver carp treatment until the end of the shelf life in the standard range. The amount of tybarbibacteric acid increased during storage period varied between 0.13- 2.11mg malondialdehyde/1000g in experimental treatments, but this factor was in the 100% treatment of silver carp paste after the end of the maintenance period in the standard range (less than 1.8 mg/100gr), in other treatments, after 30 days, was more than standard limitation. The pH changes in treatments did not significantly decrease (P〉0.05), this factor varied between 5.05 to 5.93 in the experimental period. Total bacterial counts, psychrophilic bacteria and coliform and molds were not observed in experimental treatments during storage period. Microbial contamination was not observed during the storage period in the refrigerator in the experimental treatments. The taste and texture in silver carp treatment (100%) were better than other treatments. The ash, protein and fat in 5 treatments did not significantly change during storage (p〉0.05). The moisture content was not significantly increased in all five treatments during storage (p〉0.05). Results showed treatment of processed carp (100%) was better than other treatments (p〈0.05).
    Keywords: Aquaculture ; Fisheries
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  • 129
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    Ministère de la Pêche et de l’Economie Maritime. Direction de la Pêche Continentale
    Publication Date: 2018-10-22
    Description: Le sous-secteur de la pêche continentale est une composante essentielle de l’activité halieutique et revêt une importance capitale pour l’économie des régions continentales (Source importante de protéine et de revenues). La Pêche continentale est pratiquée aussi bien au niveau des principaux fleuves qu’au niveau des mares et autres plans d’eau aménagés. Elle est une activité artisanale qui cherche à s’améliorer de jour en jour avec l’aide de l’Etat à travers des aménagements d’infrastructure et autres donations et subvention d’équipements. La Production de la continentale varie d’une région à une autre du fait de la configuration hydrographique, des écosystèmes et du professionnalisme des acteurs.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 130
    Publication Date: 2019-01-08
    Description: Lamakera, a tiny village in Indonesia, is a centre for the global trade in manta rays, which are listed as vulnerable by the International Union for Conservation of Nature (IUCN)
    Keywords: Conservation ; Fisheries
    Repository Name: Aquatic Commons
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  • 131
    Publication Date: 2019-01-08
    Description: A recent Consultation Workshop discussed awareness and policy support to protect ecosystems, reduce illegal fishing and promote co-management in the central coastal region of Vietnam.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
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  • 132
    Publication Date: 2019-03-27
    Description: While women in fisheries cope with the challenges of changing market systems, persistent gender inequities threaten to impact livelihoods and food security.
    Keywords: Fisheries
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  • 133
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    Publication Date: 2019-03-27
    Keywords: Fisheries
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  • 134
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    Woods Hole Oceanographic Institution
    Publication Date: 2018-04-19
    Description: This description of the small-scale sector of the Southern New England (Massachusetts, Rhode Island and Connecticut) fishery includes information on the fishermen (their ages, education, experience, occupational training, family involvement and reasons for fishing) and the physical characteristics of the fleet (the boats and gear). Fishing patterns are analyzed by species, geographical areas and seasons. The economic structure of small-scale fishing is described in terms of investment, net and gross earnings, fuel costs, crew payments systems and marketing arrangements. Management implications of this information and analyses are included.
    Description: Prepared for the Pew Memorial Trust, for the Department of Commerce, NOAA, Office of Sea Grant, under Grants 04-8-M01-149, also NA 79AA-D-00102, and for Woods Hole Oceanographic Institution's Marine Policy and Ocean Management Program .
    Keywords: Fisheries ; Fishery management
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 135
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    Woods Hole Oceanographic Institution
    Publication Date: 2018-05-23
    Description: Development of shrimp-export industry brought about the underdevelopment of Pacific Mexico's inshore fisheries. The rural fishery of south Sinaloa provides a case in point, as well as a point of departure for considering fisheries development and management policy for similar fisheries in certain other less developed countries.
    Description: Prepared with funds from the Pew Memorial Trust and by the Department of Commerce, NOAA Office of Sea Grant under Grant #04-8-M01-149, and the Institution's Marine Policy and Ocean Management Program.
    Keywords: National Sea Grant Program (U.S.) ; Fishery policy ; Fishery management ; Fisheries
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 136
    Publication Date: 2018-04-24
    Description: This bibliography of social and economic studies of the fisheries of the Northeast United States (Maine to North Carolina) includes annotated listings for each entry and an index of key words for cross-referencing. We have attempted to include all studies published since 1970, and a selected group of particularly significant studies done earlier. The major focus has been on commercial fisheries, but recreational fishing studies have also been included when possible. In addition to studies of the Northeast United States fisheries, studies of Canadian fishing subsidies, European and other markets, have been included because of their relevance to the regional industry. All stages of the fishing industry's operation - harvesting, processing, distribution, marketing - are included, along with management and policy oriented material.
    Description: Prepared for the National Marine Fisheries Service Contract NA-81-FA-C-00018 and for The Pew Memorial Trust, also for the Department of Commerce, NOAA Office of Sea Grant under NA-80AA-D-0077 (E/L-1) and the Institution's Marine Policy and Ocean Management Program.
    Keywords: Fisheries
    Repository Name: Woods Hole Open Access Server
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  • 137
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    Woods Hole Oceanographic Institution
    Publication Date: 2018-05-22
    Description: The New England fishing industry is examined in terms of the capacity of the fishing fleet, of the processing plants, and of the transportation system. Limitations on the capacity of the industry, and its capability and flexibility, are explored in terms of social, economic and technical aspects. The study is based on interviews with fishermen, buyers, processors and distributors, and on data made available by the National Marine Fisheries Service. Although the fisheries is in a state of expansion and both vessels and plants have a greater capacity than is now being used, the major problems that may restrict expansion in both fishing and processing are quality control, species selection and market development.
    Description: This document is the final report for NOAA Contract #03-6-043-35165, which supported most of the research. Research was also supported with funds from the Pew Memorial Trust and from the Department of Commerce, NOAA Office of Sea Grant under Grant #04-8-M01-149, and was sponsored by the Woods Hole Oceanographic Institution's Marine Policy and Ocean Management Program.
    Keywords: Fisheries ; Fishery processing industries
    Repository Name: Woods Hole Open Access Server
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  • 138
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    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Publication Date: 2018-11-02
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2018
    Description: Highly migratory marine fishes support valuable commercial fisheries worldwide. Yet, many target species have proven difficult to study due to long-distance migrations and regular deep diving. Despite the dominance of oceanographic features, such as fronts and eddies, in the open ocean, the biophysical interactions occurring at the oceanic (sub)mesoscale (〈 100 km) remain poorly understood. This leads to a paucity of knowledge on oceanographic associations of pelagic fishes and hinders management efforts. With ever-improving oceanographic datasets and modeling outputs, we can leverage these tools both to derive better estimates of animal movements and to quantify fish-environment interactions. In this thesis, I developed analytical tools to characterize the biophysical interactions influencing animal behavior and species’ ecology in the open ocean. A novel, observation-based likelihood framework was combined with a Bayesian state-space model to improve geolocation estimates for archival-tagged fishes using oceanographic profile data. Using this approach, I constructed track estimates for a large basking shark tag dataset using a high-resolution oceanographic model and discovered a wide range of movement strategies. I also applied this modeling approach to track archival-tagged swordfish, which revealed affinity for thermal front and eddy habitats throughout the North Atlantic that was further corroborated by synthesizing these results with a fisheries-dependent conventional tag dataset. An additive modeling approach applied to longline catch-per-unit effort data further highlighted the biophysical interactions that characterize variability in swordfish catch. In the final chapter, I designed a synergistic analysis of high-resolution, 3D shark movements and satellite observations to quantify the influence of mesoscale oceanography on blue shark movements and behavior. This work demonstrated the importance of eddies in structuring the pelagic ocean by influencing the movements of an apex predator and governing the connectivity between deep scattering layer communities and deep-diving, epipelagic predators. Together, these studies demonstrate the breadth and depth of information that can be garnered through the integration of traditional animal tagging and oceanographic research with cutting-edge analytical approaches and high-resolution oceanographic model and remote sensing datasets, the product of which provides a transformative view of the biophysical interactions occurring in and governing the structure of the pelagic ocean.
    Description: Supported by the NASA Earth and Space Science Fellowship, the MIT John S. Hennessy Fellowship, the MIT Martin Family Society of Fellows for Sustainability Fellowship, the WHOI Ocean Venture, Grassle, and James Stratton Fellowships and the WHOI Academic Programs Office. This research and its dissemination was supported by funds from National Geographic, Amazon Web Services, the Explorers Club, Rolex, Sigma Xi, the MIT Center for International Studies, WHOI Access to the Sea and Coastal Ocean Institute Funds, MIT Graduate Student Council, MIT Student Assistance Fund, WHOI Biology Department, American Fisheries Society, WHOI Academic Programs Office
    Keywords: Fishes ; Fisheries ; Pelagic fishes ; Eddies ; Animal marking
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
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  • 139
    Publication Date: 2019-06-05
    Description: Fish samples of Otolithes ruber (Bloch & Schneider, 1801) of various lengths (cm) and weight (g) were collected from Damb Fish Landing Centre at Sonmiani, Balochistan during 15th August 2009 to 15th April 2010. Total (56) fish samples were collected during the two major seasons Northeast Monsoon and Southwest Monsoon. The concentrations of Fe, Mn, Zn, Cu, Pb, and Cd were recorded in fish muscles. The mean concentration of Fe (4.23±1.38 μg/g), Mn (0.28±0.18 μg/g) and Cd (0.46±0.06 μg/g) were recorded in NE-monsoon. However Zn (3.34±1.19 μg/g), Cu (0.33±1.14 μg/g), and Pb (0.02±0.01 μg/g) showed highest concentration in SW-monsoon season. The results indicated that Fe concentrations were higher than other metals. Analysis of Variances (ANOVA) were performed in between seasons and metals, the significant difference was observed in Mn (P〉0.01 at 0.05) and Pb (P〉0.006 at 0.05) between seasons. The order of the metals in the fish samples based on concentrations in the tissues analyzed, as follows: Fe〉Zn〉Cu〉Mn〉Pb〉Cd. Results concluded that the concentration of metals did not exceed the permissible limit of the food regulations of international standards. Hence there is no health hazards to humans consuming of O. ruber.
    Keywords: Biology ; Fisheries
    Repository Name: Aquatic Commons
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  • 140
    Publication Date: 2019-06-05
    Description: Thukri net is basically a bottom set drift net, widely operated for shrimp catching along the coastal waters of Sindh and Balochistan provinces, creeks of Indus delta, Sonmiani bay and nearby shallow coastal areas. The field investigation was done for two fishing seasons) from 15th August, 2008 to 15th April 2009, and from 15th August 2009 to 15th April 2010. The catch rate of shrimp varied from 0.50kg/net/day to 7.50kg/net/day. Maximum catch 7.50kg/net/day was recorded in September 2008 and minimum 0.50kg/net/day in April 2009. The maximum catch of fishes (by-catches) was (3700kg/net/day) in September, 2008 and minimum was (12kg/net/day) in April, 2009. The average catch was 462.2kg/month and 4159.8kg/year in 2008-2009. The Thukri net catch of shrimp were about 779.40kg/boat/year and about 830kg/boat/year during 2008-2009 and 2009-2010 respectively and the finfishes were 4160kg/boat/year and 4779 kg/boat/year during the same period.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 141
    facet.materialart.
    Unknown
    New Haven, CT: Yale University, Economic Growth Center
    Publication Date: 2019-06-14
    Description: Attempts to curb illegal activity by enforcing regulations gets complicated when agents react to the new regulatory regime in unanticipated ways to circumvent enforcement. We present a research strategy that uncovers such reactions, and permits program evaluation net of such adaptive behaviors. Our interventions were designed to reduce over-fishing of the critically endangered Pacific hake by either (a) monitoring and penalizing vendors that sell illegal fish or (b) discouraging consumers from purchasing using an information campaign. Vendors attempt to circumvent the ban through hidden sales and other means, which we track using mystery shoppers. Instituting random monitoring visits are much more effective in reducing true hake availability by limiting such cheating, compared to visits that occur on a predictable schedule. Monitoring at higher frequency (designed to limit temporal displacement of illegal sales) backfires, because targeted agents learn faster, and cheat more effectively. Sophisticated policy design is therefore crucial for determining the sustained, longer-term effects of enforcement. Data collected from fishermen, vendors, and consumers allow us to document the upstream, downstream, spillover, and equilibrium effects of enforcement on the entire supply chain. The consumer information campaign generates two-thirds of the gains compared to random monitoring, but is simpler for the government to implement and almost as cost-effective.
    Keywords: K42 ; O1 ; L51 ; ddc:330 ; Enforcement ; Regulation ; Law and Economics ; Fisheries
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
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  • 142
    Publication Date: 2019-06-15
    Description: This study conducted to evaluate the toxic effects of a widely used oxadiazon herbicide,on common carp (Cyprinus carpio) fingerling (15 g). The 96-h LC_50 was determined, and the growth performance, serum biochemical and hematological parameters, DNA damage of erythrocytes cells, as well as histopathological changes were also determined in fish exposed to sublethal concentrations (1, 1.5 and 2 ppm) of the herbicide for 30 days. The 96-h LC_50 to C. carpio was found to be 3.9 ppm. Weight gain (WG), specific growth rate (SGR) and condition factor (CF) were decreased, while food conversion ratio (FCR) increased in the exposed fish groups (P〈 0.05). Erythrocytes cells of fish exposed to 1, 1.5 and 2 ppm of oxadiazon showed DNA damage (21.3%, 22.9%, and 28.4%, respectively), significantly higher than control group (p 〈 0.05). Moreover, exposure to oxadiazon significantly decreased WBC, RBC, Hb, Hct as well as serum albumin, glucose, and total protein levels, while serum ALP was significantly increased in the exposed fish groups (
    Keywords: Biology ; Fisheries ; Pollution
    Repository Name: Aquatic Commons
    Type: Thesis , NonPeerReviewed
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  • 143
    Publication Date: 2019-06-17
    Description: Alburnus chalcoides is a member of the Cyprinidae, which is considered as biologically, ecologically and economically important fish. Sampling of this fish was done randomly from the first day after hatching to pre-puberty at different intervals. The growth of this fish was investigated morphologically and histologically by Hematoxylin-Eosin staining method, and the secretion of gastrointestinal mucosal layers of the cells from carbohydrates was studied by histochemical analysis by periodic acid scavenging. To study the physiology of fish, its digestive enzymes were studied. Anatomical study on this fish showed that its digestive system consists of two major parts of the esophagus and intestines. In the early days of the digestive tract, it was a simple and simple tube in which mucosal secretions were not observed, but after the appearance of the Goblet cells, this activity began and a layer of neutral polysaccharide compounds was observed on the gastrointestinal tract. The presence of neutral polyunsaccharide secretions in the gastrointestinal mucosa has shown that it plays a role in the digestion and absorption of food and is important in protecting the epithelial layer of the digestive tract and passing food. In enzymatic studies, it was found that all enzymes had a significant difference in the level (p 〈0.05). The trypsin, chymotrypsin, and amino-peptidase enzymes have been shown to be more prominent in the two active start-ups, and the third and fourth weeks (entering the infant's age and adolescence). The alkaline phosphatase enzyme has a relatively stable trend and increased on the fifth day (mouth opening) and decreased slightly from week 4. Lipase and amylase also have a decrease trend, which is likely to be linked to a high protein diet of the animal. The start of active nutrition was increased, evolutionary characteristics of this fish were somewhat similar to other fish of the carp species, but there were also some differences.
    Keywords: Biology ; Fisheries
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  • 144
    Publication Date: 2019-09-12
    Description: Portunus pelagicus (Linnaeus, 1758) known as the blue swimming crab, ranks 4th major fishery export of the Philippines. The Visayan Sea is considered as the major crab fishing ground of the country to which 25 out of 53 crab picking stations are located in Region 6. The study was conducted in the year 2011 to 2012 in ten crab fishing municipalities of the Western Visayan Sea conducting catch and effort, reproductive biology, and biological sampling. Results showed that a decreasing CPUE is observed compared in 1995 at 0.34 kg/ panel to 0.19 kg/panel in 2011 and 0.26 kg/panel in 2012, with 17 to 20 gillnet-panels per boat per day. Surplus production models showed that MSY at 13,150 MT and fMSY at 19,473 gillnet-panels of the Fox model is achieved prior to the year 1999. In 2011 and 2012, yield decreases as a setback of increasing fishing effort. Population parameters results showed growth overfishing where the L∞ value obtained at 19.10 cm for this study was lower compared to 19.95 to 21.77 cm in previous studies. Computed E value at 0.68year-1 is higher than the threshold at E = 0.5year-1 and at optimum E10 = 0.56year-1. Recruitment overfishing is also apparent from the size catches of major crab fishing gears to length at first maturity of 11.5 cm. Bottomset gillnet catches premature sizes by 57%, crab pot by 62%, and otter trawl by 95%. Seasonality of crab catching peaks in July and January coincides with the peak spawning in August and January, and recruitment in October and January.
    Keywords: Conservation ; Fisheries ; Policies
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  • 145
    Publication Date: 2019-09-12
    Description: An analysis of the ten-year data on catch, effort, and length frequency of small pelagic caught from ring net fishery in the Camotes Sea was made. Length frequency data were used to estimate growth, mortality (total, natural, and fishing mortalities) and exploitation levels using the FAO-ICLARM Fish Stock Assessment Tools (FISAT) program developed by FAO/ICLARM. Generally, the sizes of the major species caught from ring net fishery are smaller than the maximum size they can attain and were harvested before reaching maturity lengths. The probability of capture at L50, however, was higher in 2003-2012 than in 1983-1987 assessment. Analysis of the recruitment pattern in the Camotes Sea reveals a dual recruitment mode per year starting from April to June which conforms to the findings of Jabat and Dalzell (1988) of which bimodal pattern of recruitment was observed for most of the small pelagic species in the catch of the ring net fishery from the Camotes Sea and in the Philippines in general. Exploitation rate (E=F/Z) estimates of three dominant pelagic species, Decapterus macrosoma (L∞=27.56 and present E=0.71), Selar crumenophthalmus (L∞=30.03 cm and present E=0.68), and Decapterus kurroides (L∞= 41.64 and present E=0.51) revealed they are vulnerable to ring net fishery as exhibited by high E values exceeding the 0.5 threshold. The present exploitation levels suggest growth overfishing of these pelagic species which will eventually lead to unsustainable ring net fishery in the Camotes Sea.
    Keywords: Conservation ; Fisheries
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  • 146
    Publication Date: 2019-09-12
    Description: This study aimed to generate and assess the 10-year (2003-2012) data on estimated annual yield of tuna, the catch per unit effort (CPUE) of dominant fishing gears, catch composition, seasonality, and size composition of tuna species in Zambales Coast. This is in support to the implementation of the National Tuna Management Plan. Results were based on the landed catch recorded at the identified sampling site in major fish landing centers in Zambales. The tuna catch in Zambales showed an increasing trend from 2005 to 2011,the highest catch was observed in 2011 with 12,968 MT. The major tuna fishing gears observed in the area were purse seine, multiple handline, and ring net. The CPUE of the three dominant tuna fishing gears showed that purse seine, a commercial fishing gear, has the highest average CPUE with 1,678.52 kg/day, followed by ring net with 222.07 kg/day, and multiple handline, which is a municipal fishing gear, with 62.94 kg/day. There were eight species of tuna being caught in Zambales Coast. The most dominant species caught were skipjack tuna (Katsuwonus pelamis), followed by yellowfin tuna (Thunnus albacares), and bigeye tuna (Thunnus obesus). The monthly seasonal distribution of the three dominant tuna species was also assessed. Peak in the catch of Katsuwonus pelamis was recorded in the first quarter of the year. For Thunnus albacares, the highest catch was observed during the second and third quarter. The bulk of catch for Thunnus obesus appeared on every first and second quarter of the year. All of these species were observed to have almost consistent production in the remaining quarters of every year. Data on size composition of tuna revealed that most of the tuna species landed in Zambales were caught before they reach the length at first maturity. Among species caught, Thunnus albacares and Thunnus obesus recorded the highest percentage of small tuna.
    Keywords: Conservation ; Fisheries
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  • 147
    Publication Date: 2019-09-12
    Description: Assessment of fisheries in Taal Lake was conducted from 1996-2000 and 2008-2011 to know the status of the commercially important fishes with emphasis on the endemic freshwater sardine, Sardinella tawilis. Results of the fish landed catch survey in 11 coastal towns of the lake showed a decreasing fish harvest in the open fisheries from 1,420 MT to 460 MT in 1996 to 2011. Inventory of fisherfolk, boat, and gear also decreased to 16%, 7%, and 39%, respectively from 1998 to 2011. The most dominant gear is gill net which is about 53% of the total gear used in the lake with a declining catch per unit effort (CPUE) of 11kg/day to 4 kg/day from 1997 to 2011. Active gear such as motorized push net, ring net, and beach seine also operated in the lake with a CPUE ranging from 48 kg/day to 2,504 kg/day. There were 43 fish species identified in which S. tawilis dominated the catch for the last decade. However, its harvest also declined from 744 to 71 mt in 1996 to 2011. The presence of alien species such as jaguar fish, pangasius, and black-chinned tilapia amplified in 2009. Population parameters of S. tawilis from 2009 to 2011 were estimated using the FiSAT (FAO-ICLARM Stock Assessment Tool) software. The analysis of length frequency data showed an estimated L∞ of 15.40 to 16.36 cm and K value ranged from 0.53 to 0.73. The total mortality (Z) ranged from 3.01 to 5.03, natural mortality (M) from 1.44 to 1.75, fishing mortality (F) from 1.57 to 3.28 and exploitation rate (E) from 0.52 to 0.65. The high values of fishing mortality and exploitation rates indicate unsustainable fishing practices. Conservation and management measures of the fishery resources in the lake were recommended for appropriate action of the Protected Area Management Board (PAMB)
    Keywords: Conservation ; Fisheries ; Policies
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  • 148
    Publication Date: 2019-09-12
    Description: This technical paper discusses the results of the 10-year assessment (January 2004 to December 2013) of the fisheries of Tayabas Bay to determine the current status and level of exploitation and measure the effects of interventions introduced and implemented in the Bay and adjacent waters of Quezon and Batangas provinces. The trend of catch, effort and catch per unit effort from 2004 to 2013 showed an increase in catch attained by increasing effort, with fluctuating CPUE. The highest catch (24,622.9 MT) was attained in 2012. In 2013 the total production was 22,595.8 MT, an increase of 6.9% from the 2004 production. The fisherman’s density of 20/km for Tayabas Bay is low compared to other major fishing grounds like Lingayen Gulf, Guimaras Strait, and Manila Bay, but slightly higher than the estimates for Honda Bay and Ormoc Bay. The number of observed boat landings of all gears ranged from 13,746 MT in 2013 to 33,842 MT in 2005. The standardized annual estimated effort of the bottom set gillnet ranged from 2,199,589 MT to 7,194,394 MT. Most of the artisanal or municipal gears such as multiple hook and line (7 kg to 6 kg), drift gillnet (53 kg to 7 kg), and hook and line (9 kg to 5 kg) showed declining catch rates (CPUE). The bottom set gillnet, spear gun and surface gillnet, however, showed an increasing trend. Out of 16 species of fish analyzed, Cypselurus naresii, Rastrelliger faughni, Rastrelliger kanagurta, Decapterus tabl, Siganus canaliculatus and Upeneus sulphureus exhibited an E-value exceeding 0.5, which indicates overexploitation. As to the recruitment, nine species showed bimodal recruitment while seven species showed unimodal recruitment. There are seven species that have a mean length greater than their length at first maturity, which indicates that they have contributed to the recruitment process of their stocks before they are caught.
    Keywords: Conservation ; Fisheries
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  • 149
    Publication Date: 2019-09-12
    Description: Decatopecten radula is highly sought for its shell meat making it as a source of food and income for local shellfish gatherers in Guiuan, Eastern Samar. This study provides biological information for future conservation and management. Data were obtained monthly in the three selected sites within coastal waters of Guiuan, Eastern Samar from January 2016 to December 2016. These scallops were distributed at shallow areas of Trinidad Tubabao Island, Kamandag Reef, and Magluto Reef in depths of approximately 1-5 meters throughout the sampling period. Scallops are abundant in Kamandag reef where the site is characterized by its rocky area and mainly composed of a sandy bottom. Scallops were found on the surface of the sediment, attached to rocks or hard elements, hidden in a seagrass and seaweed. Physico-chemical parameters were observed within a narrow and normal range. Water temperature did not vary widely from 28°C to 30°C while salinity, pH, and dissolved oxygen ranged from 33-34, 8.2-8.7, and 3.4–4.8 mg/L respectively. The results from the 825 scallops showed that D. radula is dioecious species with four gonad stages (developing, mature, spawning, spent) based on the histological examination and calculation of gonadosomatic index (GSI). The spawning period of the species is protracted and spawning peaks occur from August to November with a male-female sex ratio of 1:1.24. Size at sexual maturity reached 55 mm shell height (SH) in males and 60 mm SH in females. Thus, the collection of scallop should be limited to individuals 〉60 mm shell height.
    Keywords: Biology ; Conservation ; Fisheries
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  • 150
    Publication Date: 2019-09-12
    Description: The Lagonoy Gulf is one of the largest and most important fishing grounds in the Bicol Region. It is endowed with commercially important finfish and is characterized by a multi-species and a multi-gear fishery. Assessment of marine fishery resources was done to determine the status of the gulf and to evaluate the effects of fishing activities in support to fisheries management. The data used were from 1998 to 2012. Consolidated results from the National Stock Assessment Program (NSAP) of Region V were collected along the determined landing sites in the provinces of Albay and Camarines Sur. The results showed that catch composition was dominated by small pelagics (43.83%), followed by large pelagics (42.18%), and demersal fishes (13.94%). It is also noted that 89-98% of the small pelagic species were caught below the length at first maturity and their vulnerability to several fishing gears resulted in growth overfishing. Analysis of the growth parameters indicated that the species were relatively fast-growing and short-lived – L∞ ranges from 24.92 for Indian scad (Decapterus russelli) to 52.81 for Frigate tuna (Auxis thazard); and a k value of 0.85 for the same species (A. thazard) to 1.34 for Indian mackerel (Rastrelliger kanagurta). The total mortality rate is high, ranging from 7.02, as manifested in Bigeye scad (Selar crumenophthalmus), to 13.13 for the Island mackerel (R. faughni). Lagonoy Gulf also suffers from overexploitation, in which computed E values were far beyond the optimum level of exploitation (E ranges from 0.69 to 0.84), which is the result of heavy fishing pressure in the area.
    Keywords: Conservation ; Fisheries ; Management
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  • 151
    Publication Date: 2019-09-12
    Description: Davao Gulf houses diverse marine ecosystems that support the fisheries activities of the entire Region XI. A study through the National Stock Assessment Program from 2004-2013 was conducted to provide baseline information on the stock condition and the level of exploitation of the commercially important small pelagic fishes in Davao Gulf. The results showed that commercial fishing contributes to about 88% of the annual average landed catch in the region. Ring net (in payao or free-school) and bag net are the only commercial types of fishing gears operating in Davao Gulf with average production per year of 3,069.62 MT, 199.25 MT, 122.21 MT respectively. Moreover, RNp is the major gear catching Selar crumenopthalmus which is 32% of the total landed catch followed by Decapterus macarellus at 16%. Similarly, Mene maculata dominated the catch of RNf by 41% while most catch of BN is composed of Auxis rochei, Rastrelliger faughni and D. tabl. Species composition data indicated the bulk catch of these commercial gears is small pelagic fishes. However, the average CPUE of these gears showed a decreasing trend. The most evident decline occurred in 2013 with a drop of almost 70% in the CPUE of BN. Heavy fishing pressure is manifested since the annual harvest and the relative abundance of the small pelagic fishes generally decreased. Likewise, L50 declined in which smaller sizes of fish are being caught as commercial gears are exploiting the juveniles. Most of the commercial fish catch has not attained maturity. The length frequency data also showed that E-values of these small pelagic fishes range from 0.51-0.86/year, an indication of exploitation above the optimum level. Consequently, the potential yield estimates already surpassed the allowable catch limit and fishing effort in both Schaefer and Fox models. The study suggests that Davao Gulf is in the state of over exploitation due to intensified fishing operations. This calls for intervention and policy implementation to conserve and manage the fishery resources in Davao Gulf.
    Keywords: Conservation ; Fisheries
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  • 152
    Publication Date: 2019-09-12
    Description: Babuyan Channel is one of the major fishing grounds in the country providing livelihood, income, and employment particularly to fisherfolk living in the coastal areas of the Northern Philippines thus, there is a need to assess the status of the area to determine strategies and policies to sustain its production and livelihood of the fisherfolk. The study determined the types of fishing boat and gear operating in the area, the annual fish catch estimates to include commercial and municipal production, the catch per unit effort of various gears,the seasonality of dominant species, the relative abundance and population parameters of some commercially important species to include Decapterus macrosoma, Coryphaena hippurus, and Trichiurus lepturus using data collected from 2009 to 2013, and the methods used by the National Stock Assessment Program. Most of the fishing boats and gears operating in the Babuyan Channel are under the municipal fisheries sector. However, production is higher in the commercial sector suggesting higher fishing effort and catch rate was exerted by commercial fishing boats and gears in the fishing ground. The trend of annual fish production in the fishing ground is fluctuating as reflected by the changing production in both municipal and commercial sector during the study period. The fluctuating production may be due to environmental, social, and economic factors such as increasing operation cost due to increasing fuel price, conflict, and livelihood shifting on elvers gathering in the earlier part of 2011-2012. The noted increase in 2013 was mainly due to the strict implementation of FAO 242, banning elvers gathering, and policies formulated at the local level. Drift Filter Net dominated the commercial and municipal fisheries, respectively. There were 256 species belonging to 69 families caught in the fishing ground indicating a high diversity in the area. N. tennuipes topped the production in Babuyan Channel caught by the Drift Filter Net and Pair Trawl in the mouth of Cagayan River in Aparri, Cagayan. As observed, the fishing mortality values were higher than the natural mortality, an indication that high fishing pressure is being experienced on the fishing ground.
    Keywords: Conservation ; Fisheries
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  • 153
    Publication Date: 2019-09-12
    Description: Historically, the waters of Sarangani Bay have rich fishing grounds. Fisherfolks depend mostly on fishing and have been the primary source of living. The study covered two municipal landing sites in Sarangani Province and one site in General Santos City, with its fishing ground in Sarangani Bay, to have information on the status of pelagic resources. Results show a decreasing trend in catches of pelagic species from 92% in 2008 to 86% in 2012. The same decreasing trend can be seen in the number of species recorded compared to the previous study, from 401 species to 249. With regards to fishing gears used in the bay, there are five commonly used: multiple hook and line, scoop net, surface gill net, encircling gill net, and troll line. Analysis of data was made using different analytical models contained in FiSAT II software. Growth parameters like maximum length (Lmax), K-values, total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation ratio were computed using the length data. Recruitment pattern analysis, virtual population analysis, and yield per recruit were also analyzed.
    Keywords: Conservation ; Fisheries
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  • 154
    Publication Date: 2019-09-12
    Description: This paper discusses the status of fisheries resources of Honda Bay from January 2003 to December 2013. The eleven years annual production data shows a fluctuating trend. There was an increase in the annual number of boat landings of all gear from 95,284 in 2003 to 259,383 in 2011. The highest production was recorded in 2010 with 2,761.83 MT and the lowest in 2007 with 1,555.94 MT. Municipal fisheries contribute a large share of production with 86.03% dominated by Leoignathus splendens with 9.58%, while commercial fisheries share 13.97% dominated by Amblygaster irm which shares 38.95%. The seasonality of fishing operation for municipal fisheries is not pronounced as almost all of the different gears surveyed operate year-round, while the trend of production for commercial fishing operation is influenced by southeast monsoon or “habagat” and northeast monsoon or “amihan”. Selar crumenopthalmus and Rastrelliger kanagurta exhibited only one pulse per year while the Siganus canaliculatus and Lethrinus miniatusshowed two pulses per year. Population parameter estimates showed that of the 10 species analyzed 93% have an exploitation ratio above 0.5, which means that a majority of the common species caught were beyond their regenerative capacity.
    Keywords: Conservation ; Fisheries
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  • 155
    Publication Date: 2019-09-12
    Description: Data collection was conducted in four (4) pre-identified fish landing sites in Zamboanga City. Sampling was conducted every other two days of the month with the third day as a rest day. The strategies used included interviews with fishers and/or boat captains to determine fishing grounds, type of gear used, total catch, and the number of fishing days. Two data collectors per site determine the species, length (total length if small, and fork length on larger fish), and the weight measurements from the one kilo of samples extracted from the total catch. Results show that the CPUE for the whole commercial fisheries subsector averaged 10,890.5 kg/day while the purse seine, which is the most prevalent gear employed, had a higher average CPUE of 14,142 kg/day. Its monthly CPUE was highest in April at 19,800.28 kg/day and lowest in December at 9,624.83 kg/day. The total catch of the commercial subsector for 2013 was 22,855,452.85 kg with April registering the highest at 4,116,650.9 kg and lowest in December at 313,980 kg. Overall, Sardinella lemuru constituted 45.89% of the total commercial sector production for 2013, followed by Amblygaster sirm at 13.19%, Selar crumenophthalmus at 8.93%, Rastrelliger kanagurta at 8.81% and Decapterus macrosomaat 8.17%. The most exploited species was Decapterus macrosoma caught by Purse Seine with an E value of 0.71, followed by Sardinella lemuru with 0.59, Amblygaster sirm with 0.57, and Rastrelliger kanagurta with 0.51. The species Selar crumenophthalmus has the lowest E value at 0.38. The maximum length (Lmax) of S. lemuru, A. sirm, R. kanagurta, and D. macrosoma are much higher than the published values of length at first maturity of subject species. Decapterus macrosoma, S. lemuru, A. sirm, and R. kanagurta all have higher fishing mortality than natural mortality suggestive of overexploitation. Amblygaster sirm and Rastrelliger kanagurta caught by purse seine were both captured before maturity with L25 values of 15.0 cms and 19.0 cm respectively while Sardinella lemuru and Decapterus macrosoma were already matured when captured with values of 15.0 cm and 19.0 cm, respectively. Fishing pressure on the most dominant species, S. lemuru, is high and its maximum length has gone down by as much as 23% over the past decade.
    Keywords: Conservation ; Fisheries
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  • 156
    Publication Date: 2019-09-12
    Description: The purpose of this study is to provide a general information of fisheries in the provinces of Basilan, Sulu, and Tawi-Tawi, of the Autonomous Region in Muslim Mindanao (ARMM) covering the period from CY 2008 to 2012 which can be a basis for the formulation of fisheries management geared towards protection, preservation, utilization, and development of ARMM waters as embodied in Section 2 of the Implementing Rules of the ARMM Muslim Mindanao Autonomy Act (MMAA) No. 86. The number of boats and gears were obtained from the monitored data of NSAP. Catch and CPUE were analyzed using MS Excel. Seasonality of species was processed by extracting information on landed catch from the NSAP data and the high and low catch by month were then analyzed. Tunas and oceanic pelagic are abundant finfishes in the Sulu Sea. The catch composition was dominated by neritic and oceanic tunas with Euthynus affinis representing 35.20% of the total catch, followed by Katsuwonus pelamis with 29.22%, and Auxis thazard with 5.44%. Five small pelagic species such as Selar crumenophthalmus, Sardinella lemuru, Rastrelliger kanagurta, Auxis thazard, and Decapterus macrosoma were analyzed for seasonality and the results showed that these species commonly peaked in terms of catch during the 1st and 2nd quarters of every year from CY 2008 to CY 2012. Population parameter values (K and L∞) of the selected species were found to be within the values given in FishBase. The length frequency distribution of selected small pelagic species shows a situation of growth overfishing since they were caught at sizes before their length at first maturity (Lm). Estimates of fishing mortality and exploitation rates for most of the species analyzed were found to have exceeded the Eopt level.
    Keywords: Conservation ; Fisheries
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  • 157
    Publication Date: 2019-09-12
    Description: Leyte Gulf is among the major fishing grounds in the Philippines with a shelf area of 13, 147 km2 covering the islands of Samar and Leyte. For this reason, it was chosen as the study area in Eastern Visayas under the National Stock Assessment Program (NSAP) which aims to assess the status of fisheries resources. This paper presents the fishery stock assessment results from CY 2001-2011. The annual fish catch from 2001-2011 showed a declining trend. The lowest was in 2008 with 12, 483.52 MT while the highest was in 2003 with 26,367.32 MT. The municipal fisheries had a high catch contribution except in 2001 where commercial catch was higher by 30%. Thirty eight (38) types of fishing gears were identified operating in Leyte Gulf. Danish seine (commercial, DSC) had the highest yield in the commercial fisheries sector while for the municipal fisheries sector it was gillnet (GN). The highest catch of DSC was observed in 2004 (4,243.30 MT) and the lowest in 2010 (1,203.05 MT). The highest catch per unit of effort (CPUE) for DSC was in 2004 (288.66 kg/boat landings) and the lowest was in 2010 (167.09 kg/boat landings). For GN, the highest catch and CPUE were in 2004 (3, 010.72 MT) and 2003 (8.27 kg/boat landings) respectively; while the lowest in catch and CPUE were in 2001 (339.37 MT, 4.05 kg/boat landings). The top ten (10) species caught belong to the families Leiognathidae, Carangidae, Nemipteridae, Scombridae, Gerreidae, Engraulidae, Mullidae, Synodontidae, Clupeidae, and Portunidae. The selected five (5) major stocks, which are Rastrelliger kanagurta, Leiognathus bindus, Gazza minuta, Selar crumenophthalmus, and Nemipterus hexodon were mostly abundant in the second half of the year. The percentage of catch at which they were caught before their length at maturity were as follows: 60% for R. kanagurta, 85% for L. bindus, 13% for G. minuta, 45% for S. crumenophthalmus, and 51% for N. hexodon.
    Keywords: Conservation ; Fisheries
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  • 158
    Publication Date: 2019-09-12
    Description: This study was carried out to increase information on the status of small pelagic fish species status in Lingayen Gulf. The information includes the catch per unit of effort of fishing gears catching small pelagic and the current status of the dominant small pelagic fish species using the National Stock Assessment Program (NSAP) standard data gathering of fisheries catch and effort. The results showed that almost 50% of the total fish harvest in Lingayen Gulf are small pelagics and the commercial fisheries sector contributed the largest catch. The commercial fishing gears that mostly catch small pelagics are the Danish seine and Trawl with an annual catch per unit of effort ranging from 899 to 1,186 kg/day and 65.98 to 119.77 kg/day, respectively. The municipal fishing gears, bottom set gillnet and bottom set longline had an annual catch per unit of effort ranging from 7.04-42.95 and 7.19-13.30 kg/day, respectively. The dominant small pelagic species are Decapterus maruadsi, Decapterus macrosoma, Selar crumenophthalmus, Rastrelliger brachysoma, and Rastrelliger kanagurta. The dominant species caught by commercial fishing gears are mostly juveniles while the dominant species caught by municipal fishing gears attained maturity before they are caught. Exploitation ratio (E-values) of the dominant small pelagic species in this study exceed the optimum level of 0.5, an indication of overexploitation due to high fishing pressure.
    Keywords: Aquaculture ; Ecology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
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  • 159
    Publication Date: 2019-09-13
    Description: First of all, I would like to share some personal background of my involvement with this noble advocacy of sardine fishery conservation in the Zamboanga Peninsula. I have been with the commercial fishery sector for about 46 years to date, spent 28 years in the tuna fishing sector, started as a fisherman onboard, rose from the ranks, and was eventually assigned in land-based functions. Presently, I am connected with the SOPHIL Fishing Association, Inc. in Zamboanga City, for about 18 years already. (extract)
    Keywords: Fisheries ; Policies
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 160
    Publication Date: 2019-09-13
    Description: This study evaluated the growth and cost efficiency of tilapia (Oreochromis niloticus) and milkfish (Chanos chanos) fed three feed types used in cage farming in Taal Lake, Batangas, Philippines to serve as baseline information for cage aquaculture regulations. O. niloticus and C. chanos were reared in net cages fed three feed treatments: extruded floating feed (EFF), slow-sinking feed (SSF), and sinking feed (SF). Growth performance, feed conversion ratio (FCR), yield, and cost efficiency were compared at harvest. Results of the study showed that EFF had significantly higher mean weight gain, absolute growth and specific growth rate, biomass harvest, percentage good size fish, and FCR than SF in both O. niloticus and C. chanos (P〈0.05), but had no significant difference with SSF in terms of growth parameters (P〉0.05). FCR and biomass harvest were significantly higher in EFF than SF in O. niloticus (P〈0.05) but were not statistically different in C. chanos (P〉0.05). Survival rate was not significantly different among feed types (P〉0.05) in both species. Net profit was significantly higher in EFF than the other feed types (P〈0.05). At the same volume of fish production in the lake, the use of extruded floating feeds in cages lessened the feed cost by 17.91-29.44% for higher net returns and decreased feeds use by 19.64-30.0%, which could minimize negative impacts on the lake water environment. The results of the study revealed the comparative advantage of floating feeds over slow-sinking feeds and sinking feeds and is therefore recommended as the ideal feed type for cage farming in the lake.
    Keywords: Aquaculture ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 161
    Publication Date: 2019-09-13
    Description: Technical information on the mesh size selectivity for tawilis fishery in Taal Lake is presently unknown or undocumented and different mesh sizes of gillnets are employed to exploit the species at various sizes. The study investigated the mesh size selectivity involving gillnet fishery for Sardinella tawilis using four different mesh sizes: 3.39 cm (10k), 3.05 cm (11k), 2.77 cm (12k), and 2.65 cm (12.5k). Fishing trials were conducted in Taal Lake, Philippines from October 2014 to September 2015. A total of 4,456 pieces of S. tawilis were caught with the length ranges from 8.5 cm to 14.5 cm mid-length. The seasonal changes in the gonadosomatic index (GSI) showed that S. tawilis spawns between March-May and August. Length at 50% maturity (L50) was estimated at 11.66 cm and used as the criterion for selecting the appropriate mesh size. The optimal length for each mesh size was estimated employing the Baranov-Holt method. The estimated optimal lengths of S. tawilis were estimated at 10.6 cm, 11.08 cm, 13.07 cm, and 14.53 cm for the mesh sizes of 12.5k, 12k, 11k, and 10k, respectively. Hence, the appropriate gillnet mesh size for S. tawilis corresponding to length at 50% maturity was 3.05 cm (11k).
    Keywords: Conservation ; Fisheries ; Policies
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 162
    Publication Date: 2019-09-13
    Description: As part of the conservation efforts to address the declining population of the only freshwater Sardinella (Family Clupeidae) endemic to Lake Taal, a two-year study was conducted to determine the possible spawning grounds of Sardinella tawilis (Herre, 1927) by identifying the spatial and temporal distribution of its larvae. Fish larval samples were sorted from ichthyoplankton samples collected monthly in selected sampling stations in the lake. The morphologically identified Clupeidae larvae were determined to be S. tawilis genetically. They appeared only during March to May, with maximum abundance reaching from 700 to 1,700 ind 100m-3 during April 2015. Among the 10 water, 5 weather, and 11 biological parameters analyzed using Redundancy Analysis (RDA), temperature and other weather parameters largely influenced the temporal distribution of tawilis larvae. In terms of spatial distribution, the stations on the eastern bay of the lake showed an abundant and consistent presence of tawilis larvae for two years. Other stations which showed the presence of tawilis larvae include the southern portion of the lake, as well as in stations south to southwest area of Volcano Island. The seasonal and site-specific occurrence of tawilis larvae confirmed its spawning season and potential spawning grounds, which can serve as a scientific basis in the establishment of a Tawilis Reserve Area, as stipulated in the Unified Rules and Regulations for Fisheries in the Taal Volcano Protected Landscape Management Plan (TVPL-MP 2011).
    Keywords: Conservation ; Ecology ; Fisheries ; Policies
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 163
    Publication Date: 2019-09-13
    Description: Blue swimming crab (BSC) industry contributes considerably to the region’s economy. Despite the extensive harvesting and marketing activities, there is no information on the people who make a living out of the BSC resource. This study provides suggestions to improve the management of BSC fishery by looking into the crabbers’ socio-demographic profile, crabbing gears, crabbing practices, and awareness of regulatory measures regarding BSC fishery management. Semi-structured interviews were conducted from April to August 2014 in selected crabbing municipalities in five major fishing grounds of Eastern Visayas. Generally, the income of the crabbers and their family is way below the poverty threshold indicated for Eastern Visayas. This condition is aggravated by the lack of formal education among the crabbers and their members, which limits them from engaging in other livelihood opportunities. The marginal contribution from other livelihood sources to the household income is still insufficient to support other needs, particularly education. To increase the daily catch, crabbers resorted to unsustainable and destructive crabbing practices, which depletes further the resources. To address these issues, LGUs in partnership with other concerned organizations should formulate and implement programs and projects that will alleviate the living conditions of the crabbers. Moreover, the LGUs should implement national plans along with local legislation to ensure the regulation of BSC catching and selling. Crabbers must practice sustainable, cost-effective, and non-destructive crabbing activity to improve BSC production. Further studies into the biology, seasonality, and stock assessment are needed to craft appropriate science-based management framework.
    Keywords: Ecology ; Fisheries ; Policies
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 164
    Publication Date: 2019-09-13
    Description: The Philippines is a major supplier of marine ornamental fish in the world but the understanding of the overall local industry is limited. This study assessed the marine ornamental fish industry in the Philippines using the value chain analysis approach aimed to describe the market chain and key actors, species collected and traded, cost distribution in each of the stakeholders involved, and value addition across actors. Survey interview using purposive sampling was conducted in major collection areas in the country and data gathered was analyzed through a mixed-methods approach and validated by focus group discussions. The results identified the actors in the chain as diver-gatherer, middleman-trader, and exporter. There were 1,431 stakeholders directly dependent on the industry. The annual trade approximately involved a total of 8,554,729 pieces comprised of 1,200 marine species belonging to 144 families contributing PHP 235,496,302.50 to the country’s economy. The bulk of the supply came from Region 4A (61.06%), Region 3 (26.63%), and Region 7 (5.32%). The value chain of the industry was mapped out, revealing a gross value addition of PHP 88.27 per marine ornamental fish. Cost-return analysis showed the last node actors having the highest monthly net return while the lowest in the first node actors. Appropriate programs, policy, and institutional reforms needed to maximize the benefits of the business across key actors and ensure the sustainability of fish resources in the wild were presented.
    Keywords: Aquaculture ; Fisheries ; Policies ; Sociology
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 165
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    Unknown
    Copenhagen: University of Copenhagen, Department of Food and Resource Economics (IFRO)
    Publication Date: 2019-09-25
    Description: In this study, we investigate whether neoclassical economic theory, capital market frictions or preference-based theory can explain investment behaviour in the Dutch beam trawler fishery in the North Sea. By presenting a number of estimations, we show that vessels conducting pulse fishing invest substantially more than similar vessels undertaking conventional fishing, even after controlling for differences in such variables as capital stock, prices, profits and quotas. One possible explanation for this result is that vessel owners may obtain a separate benefit from investing in pulse fishing.
    Keywords: Q22 ; Q55 ; C23 ; ddc:330 ; Fisheries ; Investments ; Conventional Fishing ; Pulse Fishing
    Repository Name: EconStor: OA server of the German National Library of Economics - Leibniz Information Centre for Economics
    Language: English
    Type: doc-type:workingPaper
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  • 166
    Publication Date: 2018-10-11
    Description: The process of smoking squid (Sepioteuthis lessoniana) locally known as “Bakag” was enhanced. Chilling and marinating of squid mantle before smoking was introduced to improve taste and texture. The acceptable product was determined through sensory evaluation using a 5 -point hedonic scale rating. Chemical and microbial properties were determined using the standard method of analysis. Smoked squid which was chilled before smoking and those flavoured with Sprite soda was the most acceptable. The microbiological test revealed levels within acceptable limits.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 167
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    Unknown
    Kish International Campus, Tehran University
    Publication Date: 2017-04-27
    Description: Antennablennius variopunctatus, the Orange-dotted blenny, is a species of combtooth blenny found in coral reefs in the western Indian Ocean. A. variopunctatus is unique to the intertidal area and would be overlooked in conventional reef surveys. Maximum length is 8 cm in Persian Gulf (Iran, Kish Island). There are insufficient algae on the rocks, it is important to feed more frequently and supplement with algae rich food. A. variopunctatus is oviparous, their eggs are demersal and adhesive, and are attached to the substrate via a filamentous, adhesive pad or pedestal. Larvae are planktonic, often found in shallow, coastal waters. A. variopunctatus use the intertidal zone to varying degrees, at different times of tide and/or life cycle. Usage of the intertidal zone can be divided into three main categories: permanent residents - those that spend their entire life history (from juvenile through adult) in the intertidal; temporary (opportunistic/secondary) residents - those that spend only part of their lives in the intertidal (often as juveniles); transients - those that are only occasionally present in low-tide pools (likely trapped by an outgoing tide while foraging).
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Other , NonPeerReviewed
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  • 168
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    Unknown
    Kish International Campus, Tehran University
    Publication Date: 2017-04-27
    Description: Blenniella periophthalmus is a species of combtooth blenny found in coral reefs. It is commonly known as the blue-dashed rockskipper, bullethead rockskipper, false rockskipper, or the peppered blenny. B. periophthalmus is a marine, reef-associated species that occurs in tropical climates with a depth range of 0-5 m. We report for the first time from Persian Gulf (Kish Island, Iran).  This species inhabit exposed outer intertidal reef flats, where it can hide in cracks and holes. It is commonly observed clinging to rocks as the water recedes below them during the low cycle of the swell and this species is often confused with mudskipper gobies. Maximum length is 10 cm in Persian Gulf (Iran, Kish Island). B. periophthalmus has an oviparous life cycle, exhibits distinct pairing, eggs are demersal and adhesive, and are attached to the substrate via a filamentous, adhesive pad or pedestal. Larvae are planktonic, often found in shallow, coastal waters.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Other , NonPeerReviewed
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  • 169
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    Unknown
    Kish International Campus, Tehran University
    Publication Date: 2017-04-27
    Description: Pseudochromis nigrovittatus or Dottybacks are common inhabitants of coral reefs throughout the tropical Indo-West Pacific. P. nigrovittatus inhabits equally frequently mixed communities of macroalgae and hard corals and sparse hard coral communities on rock platform, including those dominated by Acropora, Porites, Galaxea. P. nigrovittatus was recorded from a depth range of 4–20 m. Maximum length is 8 cm in Persian Gulf (Iran, Kish Island). All dottybacks are hermaphrodites. The sexes are separate. There is a possibility of sexual dimorphism in P. nigrovittatus, such that males are usually bigger than females. Color and caudal fin morphology differences have also been observed. Dottybacks lay a demersal spherical egg of approximately 2–2.5 cm (300–500 embryos) in diameter, which is guarded by the male on the substrate until hatching. Reproductive behavior has been observed in pairs; before spawning, the male accompanies the female to the nest site. The spawning event takes between one to three hours depending on the species. Then, parental care is exclusively performed by the male until hatching. If appropriate tank conditions are maintained, spawning occurs every six days. Embryo development for both species lasts 96 h at 27°C. Newly hatched larvae are large (3.6–3.8 cm) and they start feeding the morning after hatching.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Other , NonPeerReviewed
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  • 170
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    Unknown
    Kish International Campus, Tehran University
    Publication Date: 2017-04-27
    Description: Chaetodon nigropunctatus or Black-spotted Butterflyfish inhabits shallow coral reefs and sandy lagoons rich in stony coral growth at depths between 3 - 15 m and feeds mainly on stony coral polyps. We report for the first time from Persian Gulf (Kish Island, Iran). Maximum length is 15 cm in Persian Gulf (Kish Island, Iran). C. nigropunctatus is indicator species for specific coral-feeding. The butterfly fish are found to be living both in groups and as an individual. They are found swimming in groups and sometimes they swim alone until they get a partner. C. nigropunctatus is oviparous breeders and monogamous, they form pairs during breeding. Spawning usually occurs at dusk. Females are often visibly distended with eggs when they are ready to spawn. The male swims behind and below the female, and here he uses his snout to nudge her abdomen. A common element among species seems to be an ascent into the water column to release gametes (eggs and sperm). After a few “false starts” the pair rises up into the water, the male’s snout against the female’s abdomen. They release a white cloud of gametes and rush back toward the bottom.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Other , NonPeerReviewed
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  • 171
    facet.materialart.
    Unknown
    Publication Date: 2017-06-14
    Description: Labour shortage has improved work conditions for women in seafood processing in Kerala, India, although gender equality in employment is still a distant dream.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
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  • 172
    facet.materialart.
    Unknown
    Publication Date: 2017-06-14
    Description: Implementation of the Sustainable Development Goals can be guided by the kind of innovative, holistic thinking found in the SSF Guidelines.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
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  • 173
    Publication Date: 2017-06-14
    Description: The implementation of the SSF Guidelines in Brazil will need to be nested in local and territorial realities, with the participation of fishers and their communities as the main agents of change.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
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  • 174
    Publication Date: 2017-06-14
    Description: Through need based training and capacity development, the Fiji based Women in Fisheries Network hopes to aid women’s value-added participation in the fisheries sector.
    Keywords: Fisheries ; Sociology
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
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  • 175
    Publication Date: 2017-06-14
    Description: Women play a key role in the running of Mercado del Mar, one of Mexico’s largest fish markets.
    Keywords: Fisheries ; Sociology
    Repository Name: Aquatic Commons
    Type: Article , NonPeerReviewed
    Format: application/pdf