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Vicuña, H.; Chalén, X.; Mendieta, E.; Aguilar, F.. |
A research survey was carried out in the southeast of the San Cristóbal island of the Galápagos Province (Galápagos Islands, Ecuador), between the 6th and 23th of december 1994; a 9 637 km2 was covered, from ca., 100 m depth waters. The Simrad EK-500 (38 kHz) acoustic equipment was used on board the I/V Tohallí of the National Fisheries Institute. The catch was compounded of 98% of makarell (Scomber japonicus) and 2% of south sardine (Sadinops sagax). The estimated results for biological and acoustic parameters for S. sagax were: sex ratio (male and female): 36% y 64%; furcal length range: 21-32 cm; mean legth: 26,6 cm; mean weith: 0,254 kg; theoreticals target strength and weight target strength (TS, TSkg): -38,9 dB and -33,0 dB. Mictofid catches were not... |
Tipo: Journal Contribution |
Palavras-chave: Pelagic fisheries; Length-weight relationships; Biomass; Biological data; Biomass; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5659. |
Ano: 1995 |
URL: http://hdl.handle.net/1834/3019 |
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Vicuña, H.; Chalén, X.. |
The document presents results from the pelagic acoustic research survey, executed at the East zone of the Galápagos Islands, between April and May 1995. A total of ca., 15 500 km² was covered. The following species were identified in the catch: mackarel (Scomber japonicus), south sardine (Sardinops sagax), mictophids (Lampanyctus spp.), and small specimens of giant squid (Dosidicus gigas). Mean legth and weight for mackarel and south sardine were 26,3 cm FL/0,251 kg and 18,6 cm TL/0,051 kg respectively. The estimated density for small pelagic fish of comercial interest (mackarel and sardine) was of 10,5 km². The estimated biomass for mackarel was ca., 125 000 t whereas for sardine was ca., 36 000 t. The current results coincide with those of March-April... |
Tipo: Journal Contribution |
Palavras-chave: Pelagic fisheries; Length-weight relationships; Biomass; Stock assessment; Echo surveys; Biomass; Stock assessment; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659. |
Ano: 1995 |
URL: http://hdl.handle.net/1834/3022 |
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Chalen, X.; Vicuña, H.. |
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... |
Tipo: Journal Contribution |
Palavras-chave: Geographical distribution; Abundance; Demersal fisheries; Fishery resources; Continental shelves; Echo surveys; Geographical distribution; Demersal fisheries; Fishery resources; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_32413. |
Ano: 1996 |
URL: http://hdl.handle.net/1834/2962 |
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