东太平洋金枪鱼延绳钓兼捕鲨鱼种类及其渔获量分析  

Analysis on shark species and catch by tuna longline fishery in the Eastern Pacific Ocean

作　　者：戴小杰[1] 许柳雄[1] 宋利明[1] 刘一淳[1] 

机构地区：[1]上海水产大学海洋学院,上海200090

出　　处：《上海水产大学学报》2006年第4期509-511,512,共4页Journal of Shanghai Fisheries University

基　　金：上海水产大学校长基金资助课题(02-48);上海市重点学科建设项目资助(项目编号:T1101)

摘　　要：2003年7月-11月份期间,对东太平洋公海海域(03°S^17°S,96°W^146°W)的超低温金枪鱼延绳钓兼捕鲨鱼进行调查。发现共兼捕到9种鲨鱼,分别是尖吻鲭鲨、长鳍鲭鲨、鳄鲨、人眼长尾鲨、路氏双鲨、长鳍真鲨、镰状真鲨、大青鲨和黑异鳞鲨,隶属于3目6科。共钓获鲨鱼24 711 kg,其中大青鲨是优势种类,占鲨鱼渔获尾数的50.4%,占鲨鱼渔获总重量的76.5%,平均个体重量达到64.9 kg。调查获得9种大洋性鲨鱼的渔获率,其中以大青鲨的最高,达到0.964尾数/千钩,鳄鲨次之为0.497尾数/千钩,其它鲨鱼的CPUE均在0.200尾数/千钩以下,此外估计了东太平洋海域金枪鱼延绳钓兼捕鲨鱼总渔获量,约在4.0~5.9万吨。During July-November, 2003, pelagic fish survey was conducted by tuna longliner covering areas of 03°S -17°S, 96°W - 146°W. Sampling gear was longline fishing. Nine shark species, which belong to 3 order and 6 family, were identified as following- shortfin mako （ Isurus oxyinchus ）, longfin mako （ Isurus paucus ）, crocodile shark （Pseudocarcharias kamoharai ）, bigeye thresher （Alopias sttperciliosus ）, scalloped hammerhead shark （Sphyrna lewini ） , ocean whitetip shark （Carcharhinus longimanus ）, silky shark （Carcharhinus falciform ）, blue shark （ Prionace giauca ） and velvet dogfish Zaraeus squamulosus ）. The total shark catch was 24711 kg. Blue shark was dominant species, accounting for 50.4% of the total number of shark catch and for 76.5% of the total weight of shark catch. Average individual weight was 64.9 kg. The CPUEs of nine shark species are calculated. The highest CPUE was 0. 964 per thousand hooks for blue shark and the second highest CPUE was 0.479 per thousand hooks for crocodile shark. The CPUE was betow 0. 200 per thousand hooks for other shark species. In addition, the total shark catch by long, line fishery in the Eastern Pacific Ocean was estimated about 40 000 - 59 000 T.

关 键 词：东太平洋公海 金枪鱼 延绳钓 鲨鱼 

分 类 号：S932.4[农业科学—渔业资源] S972[农业科学—水产科学]