Reduction in size-at-age of black sea bream (Acanthopagrus schlegelii) following intensive releases of cultured juveniles in Hiroshima Bay, Japan
Reduction in size-at-age of black sea bream (Acanthopagrus schlegelii) following intensive releases of cultured juveniles in Hiroshima Bay, Japan
复制标题
DOI：
10.1016/j.fishres.2009.04.013
复制
发表时间：
2009-08-01
影响因子：
2.4
通讯作者：
Umino, Tetsuya
中科院分区：
文献类型：
--
作者：
Gonzalez, Enrique Blanco;Murakami, Tomoya;Umino, Tetsuya
自20世纪80年代初开始渔业增殖以来，广岛湾已释放了2000多万条黑鲷幼鱼。大部分（90%）的黑鲷收获发生在4月至6月之间。在最密集的释放之后（1985-1996年），单位努力量渔获量大幅度增加。然而，2000年的年龄大小明显低于1983年。此外，到2000年，许多被释放的鱼已经成熟为雌性。改变了这只雄性先熟雌雄同体的性别比例这些变化被认为与海湾中孵化场饲养的幼鱼的密集释放有关，尽管也有证据表明，该物种的市场价格较低，导致捕捞努力量减少，也促成了这些影响。我们的研究结果突出了潜在的负面影响，密集的股票增加对当地渔业的人口结构。他们还强调了评估种群状况和监测目标物种栖息地承载能力的重要性。以决定应释放多少（如有的话）养殖幼鱼，以达到管理目标。(C)2009 Elsevier B. V.保留所有权利。
More than 20 million black sea bream (Acanthopagrus schlegelii) juveniles have been released in Hiroshima Bay since stock enhancement of the fishery began in the early 1980s. The majority (90%) of the black sea bream harvest occurs between April and June. Catch per unit effort (CPUE) increased substantially following the most intensive releases (1985-1996). However, the size-at-age in 2000 was significantly lower than in 1983. In addition, by 2000 many of the released fish had matured as females. changing the sex ratio of this protandrous hermaphrodite. These changes are thought to be related to the intensive release of hatchery-reared juveniles in the bay, although there is also evidence to suggest that a lower market price for the species, resulting in reduced fishing effort, also contributed to these effects. Our results highlight the potential negative impact of intensive stock enhancement on the population structure of a local fishery. They also emphasise the importance of assessing the status of the stock, and monitoring the carrying capacity of the habitat for the target species. to determine how many, if any, cultured juveniles should be released to achieve management objectives. (C) 2009 Elsevier B.V. All rights reserved.