首页> 外文OA文献 >Atlantic menhaden, Brevoortia tyrannus, Purse Seine Fishery, 1972-84, with a brief discussion of age and size compositionudof the Landings
【2h】

Atlantic menhaden, Brevoortia tyrannus, Purse Seine Fishery, 1972-84, with a brief discussion of age and size compositionudof the Landings

机译:大西洋鲱,Brevortia tyrannus,塞纳河渔业,1972-84,简要讨论了年龄和大小组成 ud着陆场

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

This report summarizes (I) annual purse seine landings of Atlantic menhaden, Brevoortia tyrannus, for 1972-84, (2) estimated numbers of fish caught by fishing area. (3) estimates of nominal fishing effort and catch-per-unit-effort, (4) mean fish length and weight, and (5) major changes in the fishery. During the 1970s stock size and recruitment increased and the age composition broadened. reversing trends witnessed during the fishery's decline in the 1960s. Landings steadily improved and by 1980 the total coast wide landings exceeded 400,000 metric tons.udNevertheless, the character of the fishery changed considerably. Eleven reduction plants processed fish at seven ports in 1972, but in 1984 only eight plantsudoperated at live ports. Beginning in the mid-1960s the center of fishing aclivity shifted from the Middle Atlantic area to the Chesapeake Bay area, which has continued to dominate the fishery in landings and effort through the 1970s and 1980s. During this period the average size and age of fish in the catches declined. (PDF file contains 30 pages.)
机译:该报告总结了(I)1972-84年间大西洋捕蝇器(Brevaortia tyrannus)每年大西洋围网捕捞的围网上岸量,(2)估计捕鱼区捕捞的鱼类数量。 (3)估算名义捕捞努力量和单位捕捞量;(4)平均鱼类长度和重量;(5)渔业的重大变化。在1970年代,种群规模和招募人数增加,年龄构成扩大。 1960年代渔业衰退期间出现的逆转趋势。着陆情况稳步改善,到1980年,整个海岸的总着陆量超过40万吨。 ud尽管如此,渔业的性质还是发生了很大变化。 1972年,有11个还原工厂在七个港口加工了鱼类,但在1984年,只有8个植物在活港口加工了鱼。从1960年代中期开始,捕鱼倾向中心从中大西洋地区转移到切萨皮克湾地区,直到1970年代和1980年代,该地区在登陆和努力方面一直占主导地位。在此期间,渔获物中鱼的平均大小和年龄下降。 (PDF文件包含30页。)

著录项

相似文献

  • 外文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号