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  • Demersal fisheries  (8)
  • Cell & Developmental Biology
  • Fisheries
  • General Chemistry
  • INP (Ecuador)  (10)
  • 2005-2009  (10)
  • 1975-1979
  • 1950-1954
  • 1
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    Los recursos de peces demersales de la Plataforma Continental del Ecuador. Parte uno. Distribución, abundancia y variaciones (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: A survey of demersal fish resources of the Continental Shelf of Ecuador was carried out between October 1980 an July 1985 by the National Fisheries Institute of Ecuador, with British Technical Cooperation. This report deals with the stock assessment part of the work. In the course of seven cruises, 366 valid diurnal hauls were made with a high-opening bottom trawl. The demersal fish resources were estimated by swept area methods and the results are presented. The overall average standing stock of demersal fish was 78 000 t of which 22 000 t was good fish, but 36 000 t were gurnards (Triglidae) and 3 000 t of unusable fish. The main stocks were gurnards, grunts and croakers, sharks and corvinas Cynoscion spp. The southern areas especially the Gulf of Guayaquil had the highest densities of fish (9,6 t.Km-2 or 4,0 t.Km-2 excluding gurnards). There was a massive abundance of the gurnard, Prionotus stephanophys in 1984 and 1985. There was a general decrease and other changes in the demersal stocks due to the effects of the ”El Niño” in 1983.
    Description: Published
    Keywords: Demersal fisheries ; Geographical distribution ; Biomass ; Demersal fisheries ; Geographical distribution ; Abundance ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 2
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    Evaluación acústica de recursos pesqueros pelágicos frente a la costa sur ecuatoriana durante septiembre de 1995 (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: Nineteen lightday rectangular transects were made 16 in the area of the Gulf of Guayaquil (Ecuador), and 3 in an oceanic area at the west of the Gulf of Guayaquil, this was the second part of research cruise, oriented to the evaluation of the small pelagic fish stocks, it was made between september 14th and 27th, 1995. The SIMRAD EK-500 acoustic system was used, installed on board of the National Research Institute (INP) R/V Tohallí. At the same time, people from the INP's Fisheries Observer Program were on four private enterprises vessels, while they were fishing in the same Gulf's area. They also made the biological sample of the commercial catch, for future relation with the results from the acoustic evaluation. The V/R Tohallí principal catch was jack makarell (Trachurus murphy), with a length range of 30-34 cm FL, caught over the continental talud associated with 20º C SST area. There was estimated a total of ca., 280 000 t/km2 of small pelagic, with an average density of 30,8 t/km2; and a ca., 250 000 t of small pelagic with an average density of 27,1 t/km2, in the oceanic area.
    Description: Published
    Keywords: Geographical distribution ; Demersal fisheries ; Fishery resources ; Continental shelves ; Geographical distribution ; Abundance ; Demersal fisheries ; Fishery resources ; Continental shelves ; Echo surveys
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 1-26
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  • 3
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    Distribución y abundancia de los recursos demersales en la plataforma continental del Ecuador durante octubre de 1995 (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: The demersal phase (from 18th to November 01th, 1995) of cruise T95/10/04 DO, covered an area of 15632,6 km2 between 00º36'0”N-80º34'3”O and 03º22'8”S-80º49'5”O, of the Ecuadorian Continental Plataform, the depth range from 14 to 115 meters. 120 species were recorded, divided into 85 osseous fish species, three sharks, 11 ray, 18 crustaceans, two molluscan and one holothurid (sea cucumber). Total biomass was estimated as 95297,5 t; with 97,3% of this biomass distributed between 01º00'0”S and 03º23'S. The most abundant species were: barriga juma (Larimus spp) (11153 t), corvina (Cynoscion spp) (4523 t), gallineta (Prionotus spp) (55651 t), perela (Palabrax callaensis) (3774 t) and ravi junco (Centrithmus signifer) (2407 t).
    Description: Published
    Description: Prionotus; Larimus; Cynoscion; Paralabrax callaensis; Centristhmus signifer
    Keywords: Demersal fisheries ; Geographical distribution ; Fishery resources ; Continental shelves ; Fishery resources ; Demersal fisheries ; Continental shelves ; Abundance ; Geographical distribution
    Repository Name: AquaDocs
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  • 4
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    Los recursos demersales de la Plataforma Continental del Ecuador. Parte dos. Producción potencial y recomendaciones para la utilización del recurso de pesca blanca en el Ecuador (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: The stock estimates obtained during the demersal fish resources survey in 1980-1985 were used to estimate the potential yields of demersal stocks of the Ecuadorian Continental Shelf. The difficulties of predicting yields for multispecies fisheries are discussed and modified version of the Gulland model was adopted. The potential realizable yields for multispecies fisheries are discussed and a modified version of the Gulland model was adopted. The potential realizable yield was calculated to be between 15,000 t and 20,000 t per year, of which 2,000 t is good quality fish, 5,000 t per year of small and medium fish and 8,000 t of gurnards. The majority of these resources are at present being fished at around their optimum levels and any further developments that would increase the fishing effort on demersal resources which are at present being exploited should be approached with caution. The national fisheries, especially the artisanal sector play a valuable role in the country and care should be taken to see that these are not adversely affected.
    Description: Published
    Keywords: Demersal fisheries ; Continental shelves ; Demersal fisheries ; Continental shelves ; Yield predictions ; Exploitation
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 5
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    Un estudio de histamina en Dorado MAHI-MAHI Coryphaena hippurus y su relación con la calidad de producto de la pesca ecuatoriana (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo llama la atención a las recientes epidemias de intoxicación histamínicas reportadas en los Estados Unidos, debido al consumo del dorado (Coryphaena hippurus) o Mahi-Mah, contaminado. Esto dió como resultado la prohición de las importaciones de esta especie, proveniente de varios países entre ellos el Ecuador, y siendo el dorado una especie de relativa importancia económica en este país, dicha prohibición ha preocupado al sector pesquero. Los estudios llevados a cabo muestran claramente la susceptibilidad de esta especie a desarrollar histamina. Esto se debe principalmente a la temperatura a la que está expuesta, pues la demora antes de enhielar el pescado es la etapa crítica. Los resultados muestran un aumento exponencial de los niveles de histamina, en ciertos casos después de tan solo 9 horas de almacenaje a temperaturas ambientales entre 25-30°C. Los niveles de histamina en pescado muestreado en el mercado local fueron tan altos como 250 mg/100g de muestra. Se demuestra que el problema se debe fundamentalmente al mal manejo de la captura por parte de la flota artesanal, y la subsecuente falta de infraestructura adecuada para conservarla, es decir, no se enfría el pescado. Sin embargo, el estudio muestra que una reducción de la temperatura del pescado de solo 15° menos, podría dar como resultado un producto de mayor calidad. En el presente trabajo se hacen recomendaciones para establecer un nivel máximo permitido para la exportación de 10 mg%, y se comparan dos métodos rápidos de análisis.
    Description: Published
    Keywords: Fisheries ; Histamines ; Quality control ; Fisheries
    Repository Name: AquaDocs
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  • 6
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    Distribución y abundancia de los recursos demersales en la plataforma continental del Ecuador durante junio de 1995 (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: The demersal phase (from june 24th to 09th, 1995) of cruise T95/06/02 DO, covered an area of 23833,6 km2 between 01° 04'1”N - 79° 59'6”O and 03° 22'7”S - 80° 48'0”O, of the Ecuadorian Continental Plataform, the deph range from 13 to 111 meters. 161 species were recorded, divided into 106 oseum fish species, five sharks, nine ray, 37 crustaceans, three molluscan and one holothurid (sea cucumber). Total biomass was estimated as 91685, 5 t, with 68,72% of this biomass distributed between 02° 15'1”S - 03°22'7”S, opposite to Guayaquil Gulf. The most abundant species were: Gallineta (Prionotus stephanophrys) (37283,7 t), Barriga juma (Larimus spp) (16146,2 t), Perela (Paralabrax spp) (14053,4 t), Palometa (Peprilus medius)(9865,3 t) and Cabezudo (Caulolatilus cabezon)(4435,9 t).
    Description: Published
    Keywords: Demersal fisheries ; Biomass ; Geographical distribution ; Population density ; Demersal fisheries ; Biomass ; Geographical distribution ; Population density
    Repository Name: AquaDocs
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  • 7
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    Estudio sobre la calidad y utilización de algunas especies de pescado demersal de tamaño pequeño en el Ecuador (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: In the paper presented, comparisons are made between 12 species of small demersal fish (less than 30 cm O.L.) commonly found in the shrimp by-catch. Each species is described, estimates are made as to their relative abundance and fishery and complete data are presented on processing: filets, deboned minces. Taste panel work was carried out on cooked fillets as well as products made from the deboned mince and chemical analyses were made on all the species. The possibility of future increased utilization of these species is discussed.
    Description: Published
    Keywords: Demersal fisheries ; Organoleptic properties ; Demersal fisheries ; By catch ; Shrimp fisheries ; Processing fishery products ; Organoleptic properties
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 8
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    Un estudio de la factibilidad del uso de trampas para peces como un nuevo método de pesca en las Islas Galápagos (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: 153 experimental sets were made with stackable Antillean fish traps in depths of 5 to 30 m in the waters around the Galápagos Island (Ecuador), between Octobre and April 1983. 1,885 fish were caught of 18 species mainly of the families Pomadasyidae, Acanthuridae, Sparidae and Serranidae. The mean catch rate was 5,5 Kg per lift or 0,4 Kg.h-1, and the mean weight of the fish caught was 0,45 Kg. The optimum set duration was found to be between 2 and 18 hours (possibly indicating a high rate of escape). This study took place during the period of the ”El Niño”, when catches of fish in this area generally were low, and it is not known what effect this had. The catches were good compared with other shallow areas, but the fishes caught were mainly of medium quality. It is thought that significant increases in the quantity and quality of the catch could be obtained with commercial traps in deeper areas, but the efficient use of these would require new vessels and equipment, and the resulting increase in fishing effort could lead to overfishing of the most acceptable species of reef fish. Hence the development of fishery using fish traps is not recommended for Galápagos. A study of the biology of the fish caught was carried out. A bibliography of references on fish traps and their use was compiled and is included.
    Description: Published
    Keywords: Fisheries ; Trap fishing ; Fisheries ; Catch statistics ; Trap fishing
    Repository Name: AquaDocs
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  • 9
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    Estudios sobre la edad y crecimiento de la Palma Calamus brachysomus (Lockington) (Pisces: Sparidae) en aguas ecuatorianas (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: 342 specimens of sparid Calamus brachysomus ”Palma”, collected during a demersal trawl survey by the R. V. Tohallí in April and May1983, were examined. The different techniques used to prepare scales and otoliths for ageing are described and analysed. The otoliths were determined to be the most reliable for ageing studies; 87% of otoliths were readable. The rings observed were assumed to be annual. The mean lengths at age were used to determine the parameters of the Von Bertalanffy growth formula, giving: Lt=50.13(1-e-0.1473(t+2.0704)). The growth curve obtained must be considered provisional due to possible biases in the interpretation of the otoliths, and also due to those arising from the selectivity of the fishing gear.
    Description: Published
    Keywords: Demersal fisheries ; Growth ; Otoliths ; Age ; Demersal fisheries ; Age ; Growth ; Growth curves ; Otoliths ; Otolith reading
    Repository Name: AquaDocs
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  • 10
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    Áreas de distribución y abundancia de los recursos demersales en la plataforma continental del Golfo de Guayaquil. (2009)
    INP (Ecuador)
    Details
    Publication Date: 2021-05-19
    Description: In the Dermersal Fishing period of the Cruise T94/11/05 D-O (15/11/94-23/11/94) an area of 12,520.9 km2 was covered, that is. The Ecuadorean Shelf between the 02°10'0”S - 80°0'0”W and 14 to 115 meters deep throughout th Ecuadorean Continental Shelf of the Guayaquil Gulf area. A total of 78 species was identified as follows: 74 of this 95%, two of crustaceans, one of molluscan and one of holothurid (Sea cucumber). The estimated total biomass of demersal fish was of 78, 384.9 t, from which the 52% was concentrated between the 02°48'9”S and 03°15'8”S. The most abundant species were: Gallineta (Prionotus stephanophrys)(48,776.0 t), Corvina (Cynoscion spp.) (11,241.7 t), Barriga juma (Larimus spp) (4,111.8 t), Cabezudo (Caulolatilus spp) (2,554.2 t) and Torno (Micropogonias altipinis) (2,750.3 t).
    Description: Published
    Keywords: Geographical distribution ; Demersal fisheries ; Fishery resources ; Geographical distribution ; Demersal fisheries ; Fishery resources
    Repository Name: AquaDocs
    Type: Journal Contribution
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