Biology and population dynamics of the long-finned squid Loligo plei (Cephalopoda: Loliginidae) in southern Brazilian waters
Biology and population dynamics of the long-finned squid Loligo plei (Cephalopoda: Loliginidae) in southern Brazilian waters
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巴西南部水域长鳍鱿鱼 Loligo plei（头足类：Loliginidae）的生物学和种群动态
DOI：
10.1016/s0165-7836(01)00397-6
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发表时间：
2002
影响因子：
2.4
通讯作者：
Uirandé Oliveira
中科院分区：
文献类型：
--
作者：
J. A. A. Perez;D. Aguiar;Uirandé Oliveira
对1995年4月至1998年2月在巴西南部圣卡塔琳娜海岸的长鳍鱿鱼的种群结构和繁殖模式进行了分析。该文对1995年4月至1998年2月在伊塔哈ı́港上岸的商业渔获物的生物样本进行了分析。这些物种是以130 mm套长度(ML)被招募到拖网渔业的，雄性平均比雌性大近1.3倍。男性和女性ML-体重关系的指数分别为1.89和2.07，且在成熟期之间存在显著差异。两种性别的受精卵都没有持续到第二年，这一特征，再加上耗尽的动物的稀缺性，为半平等提供了证据，寿命接近一年。延长的季节性繁殖和产卵模式的特点是大型繁殖活动集中在夏季的几个月，延续到秋季和冬季。建议夏季产卵鱼在夏季-初秋孵化，春季投放渔场，次年夏季成熟，年龄近1岁。在冬季产卵的鱿鱼将在冬季-早春孵化，在夏季和秋季招募到渔场，并在第二个冬季产卵。在夏季和冬季产卵事件之间，持续的产卵活动产生了在拖网渔船渔获量中检测到的几个微群。夏季产卵者维持着最重要的商业密度。讨论了巴西南部海域的种群结构、季节丰度和环境条件的动态变化之间的关系。
Population structure and reproductive patterns of the long-finned squid Loligo plei off the coast of Santa Catarina, southern Brazil, were analysed from the biological samples of commercial catches landed in the Itajaı́ harbour from April 1995 to February 1998. The species were recruited to the trawl fishery at 130mm mantle length (ML) and males were, on average, nearly 1.3 times larger than females. The exponents of males and females ML–weight relationships were 1.89 and 2.07, respectively, and differed significantly between maturity stages. Cohorts of both sexes did not persist into their second year, a feature that, coupled with the scarcity of spent animals, provided evidence for semelparity with nearly 1 year life span. An extended seasonal breeding and spawning pattern was characterised with a large reproduction event concentrated during the summer months extending through autumn and winter. It is suggested that the summer spawners hatch during the summer–early autumn, recruit to the fishery in the spring and reach maturity in the following summer, at the age of nearly 1 year. Squid spawned during the winter will hatch during winter–early spring, recruit to the fishery during the summer and autumn and spawn in their second winter. Between summer and winter spawning events, continuous spawning activity produce several microcohorts detected in trawlers catch. Summer spawners sustain the most important commercial concentrations. The relationship between L. plei population structure, seasonal abundance and the dynamics of environmental conditions off southern Brazil is discussed.