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Registros recuperados: 6
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Estudios sobre la edad y crecimiento de la Palma Calamus brachysomus (Lockington) (Pisces: Sparidae) en aguas ecuatorianas OceanDocs
Martínez, J..
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.
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Age; Growth; Growth curves; Otoliths; Otolith reading; Demersal fisheries; Growth; Otoliths; Age; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 1985 URL: http://hdl.handle.net/1834/3226
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Las pesquerías artesanales de la costa del Ecuador y sus capturas en el año 1982 OceanDocs
Herdson, D.; Rodríguez, W.; Martínez, J..
A study was carried out the white fish landings made by the artisanal fisheries in mainland Ecuador in 1982. There were four main groups of landings: the fishery for large pelagic fish, the demersal longline fishery on hard grounds; the set net fisheries for corvina and other medium and large bottom fish and the landings of shrimp by-catch. The fishes caught and their nomenclature; the gears used, the vessels and the fishing communities are briefly described. The landings of with fish by these fisheries in 1082 are given and discussed. The total landings were between 15.000 t and 20.000 t. Of this about 40% was large pelagic fish; 20-30% shrimp by-catch, 20% good quality demersal fish and 10% shark. It should be possible to increase the landings in some...
Tipo: Journal Contribution Palavras-chave: Artisanal fishing; Catch composition; Pelagic fisheries; Catch composition; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_1384; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 1985 URL: http://hdl.handle.net/1834/3225
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Los recursos de peces demersales de la Plataforma Continental del Ecuador. Parte uno. Distribución, abundancia y variaciones OceanDocs
Herdson, D.; Rodríguez, W.; Martínez, J..
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...
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Geographical distribution; Abundance; Biomass; Demersal fisheries; Geographical distribution; Biomass; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 1985 URL: http://hdl.handle.net/1834/3228
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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 OceanDocs
Herdson, D.; Rodríguez, W.; Martínez, J..
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...
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Continental shelves; Yield predictions; Exploitation; Demersal fisheries; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_32413.
Ano: 1985 URL: http://hdl.handle.net/1834/3227
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Ocurrencia de gallineta con joroba, Prionotus stephanophrys Lockington (Pisces: Triglidae) en aguas ecuatorianas, y aspectos de su comportamiento, biología y utilización OceanDocs
Herdson, D.M.; Martínez, J..
The occurrence of gurnard Prionotus stephanophrys was studied in the course of a series of fisheries research cruises on the Ecuadorian continental shelf between 1980 and 1985. The species is common in coastal waters south of 1°S . Its abundance is very variable, possibly associated with sea temperatures. Normally densities are between 0.8 and 1.6 t.km-2. The standing stock varies between 13,000 and 150,000 t wich it is estimated can sustain catches of around 4,000 t pet year, and up to 40,000 t in times of great abundance. P. stephanophyrs is found in large shoals on the bottom during the day but a night moves up into mid-water to feed on euphausids. The fish caught had size range of 12 cm to 37 cm, but the majority were between 16 cm and 21 cm in total...
Tipo: Journal Contribution Palavras-chave: Biomass; Abundance; Catch composition; Natural mortality; Biomass; Catch composition; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1384.
Ano: 1985 URL: http://hdl.handle.net/1834/3157
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Una nota sobre la importancia de la pesca acompañante del camarón en el Golfo de Guayaquil OceanDocs
Martínez, J..
Reporte del estudio de la pesca acompañante del camarón para el Golfo de Guayaquil, para los meses de mayo, junio y julio de 1986. Se dan a conocer las diferentes familias y/o especies para las categorías camarón, pescado bueno y basura; con sus respectivas tasas de captura y porcentajes de ocurrencia. La razón fue 1:2.18:13.84 kg.h-1 variando 1:2.75:12.60 kg.h-1 determinándose que entre 13%-17% es aprovechado para consumo humano directo y entre 77%-81% es aprovechado. Hipotéticamente se calculó para el total de la flota camaronera (240 barcos), que apróximadamente de 11,000 y 36,000 t son aprovechadas anualmente y entre 70,000 y 190,000 t son devueltas al mar.
Tipo: Journal Contribution Palavras-chave: By catch; Shrimp fisheries.
Ano: 1986 URL: http://hdl.handle.net/1834/3150
Registros recuperados: 6
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