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Herdson, D.; Pesantes, J.. |
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... |
Tipo: Journal Contribution |
Palavras-chave: Fisheries; Catch statistics; Trap fishing; Fisheries; Trap fishing; Http://aims.fao.org/aos/agrovoc/c_2934; Http://aims.fao.org/aos/agrovoc/c_7875. |
Ano: 1985 |
URL: http://hdl.handle.net/1834/3222 |
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Bostock, T.; Herdson, D.. |
Los tiburones son muy abundantes en las aguas ecuatorianas. Son capturados tanto por embarcaciones artesanales como por barcos industriales junto con peces pelágicos grandes (dorado, picudo, atún) y como pesca acompañante en los arrastreros. No existe una pesquería dedicada específicamente a la captura del tiburón. Sin embargo, se capturan grandes cantidades como parte de la pesca acompañante de varias otras pesquerías. Los tiburones más comunes en las capturas son los de la familia Carcharhinidae, los carcharhinidos. Se tiene que considerar que no todos los tiburones capturados se comercializan. A más de la captura de la flota artesanal, una porción muy apreciable del total es realizada por barcos industriales, los atuneros y los palangreros, éstos... |
Tipo: Journal Contribution |
Palavras-chave: Shark fisheries; Shark utilization. |
Ano: 1985 |
URL: http://hdl.handle.net/1834/3163 |
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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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