海洋环境变化对北太平洋柔鱼个体生长的影响
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S 931

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国家自然科学基金(41876141);上海市科技创新行动计划(10DZ1207500)


Effects of marine environment variation on the growth of neon flying squid (Ommastrephes bartramii) in the north Pacific Ocean
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    摘要:

    海洋环境变化会对海洋生物个体大小及其生长产生影响,特别是短生命周期的种类。为此根据2009—2012、2015—2016年8—10月采集的6091尾北太平洋柔鱼样本,对其渔业生物学特征进行了研究,并分析海洋环境因子对其个体生长的影响。结果显示,雌雄个体生物学特征在不同海洋环境年均存在显著差异。柔鱼胴长与太平洋年代际涛动指数(Pacific decadal oscillation index,PDOI)呈滞后1年的正相关。PDO冷期厄尔尼诺年(2009年)柔鱼个体较同期拉尼娜年(2010和2011年)柔鱼个体大,但超强厄尔尼诺年(2015年)柔鱼个体明显偏小。同时,超强厄尔尼诺年(2015年)出现低SST和Chl. a浓度的现象,不利于柔鱼生长,并抑制性腺发育。而较高SST和Chl. a浓度为柔鱼提供良好的生存环境,有利于性腺发育,柔鱼个体相对较大。研究表明,不同海洋环境年柔鱼生物学特征存在一定的差异,同时PDO、厄尔尼诺/拉尼娜事件、SST和Chl. a浓度的综合作用是影响个体大小的主要因素。

    Abstract:

    The neon flying squid (Ommastrephes bartramii) is a dominate economic species in the north Pacific Ocean. Marine environment variation has a profound impact on the marine organisms and their growth. As a short lifespan oceanic cephalopod, O. bartramii is highly susceptible to the climate change in different degrees, such as the Pacific Decadal Oscillation (PDO), El Niño and La Niña. Consequently, investigation on growth of O. bartramii affected by variable marine environment becomes an important and basic part for cephalopod research. Based on 6091 samples of O. bartramii collected in fishing season (from August to October) from 2009 to 2012 and 2015 to 2016 in the north Pacific Ocean, the growth of O. bartramii was studied combined with the marine environmental factors in the present study. The results indicated that significant difference of fishery biological characteristics was found between different gender and marine environment years. Viewed from the difference of the dominated mantle length (ML) and body weight (BW) group, maximum values of both ML and BW occurred in 2016, while minimum values occurred in 2010 and 2015. The b values of ML-BW relationship in all sampling years were significantly different with 3, which showed allometric growth. The mature stage of both female and male squids concentrated in stage II, and the proportion of mature female squid was less than that of male squids. The maturation of ML of O. bartramii was positively correlated with the Pacific Decadal Oscillation index with one-year lag. Samples in El Niño years were greater than those in La Niña years, and individuals in El Niño year with very strong intensity were the smallest. The El Niño event with very strong intensity caused low sea surface temperature (SST) and low Chlorophyll a (Chl. a) concentration which was not beneficial to the growth and their gonad development of O. bartramii. Higher SST and Chl. a concentration provided favorable environment for O. bartramii, resulting in a greater body size and early maturation. The present study suggested that the growth and gonad development had significant difference among different marine environment years, and the synthetic actions of PDO, El Niño/La Niña, SST and Chl. a concentration were the dominate factors that affected the growth of O. bartramii.

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WANG Yan, CHEN Xinjun, FANG Zhou. Effects of marine environment variation on the growth of neon flying squid (Ommastrephes bartramii) in the north Pacific Ocean[J]. Journal of Fisheries of China,2022,46(4):569~582

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  • 收稿日期:2020-10-22
  • 最后修改日期:2020-11-30
  • 录用日期:2020-12-03
  • 在线发布日期: 2022-04-15
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