News Release

大块头雌鱼的生殖量也会成比例地增大

Peer-Reviewed Publication

American Association for the Advancement of Science (AAAS)

Big Mamma Fish Give Proportionally Bigger Reproductive Outputs (1 of 1)

image: This infographic shows how the scaling of reproductive-energy output in marine fishes affects our understanding of fisheries management, the efficacy of marine protected areas, and the impacts of climate change on fish stocks. This material relates to a paper that appeared in the 11 May 2018 issue of Science, published by AAAS. The paper, by D.R. Barneche at Monash University in Clayton, VIC, Australia, and colleagues was titled, "Fish reproductive-energy output increases disproportionately with body size." view more 

Credit: © Centre for Geometric Biology (Monash University)

一项新的研究揭示,即使考虑到体型比例等特征,那些体型较大的雌鱼也会比体型小的鱼生下更多的后代。这些结果对渔业管理人员具有意义,因为气候变化预计会令全球许多地区的鱼类体型缩小(并因而会减少它们孵出的后代数量)。有关繁殖规模是否随体型大小而变一直是激辩的问题。理论和渔业模型假设,一条2千克(kg)的鱼的生殖产量等于两条1kg的鱼的生殖产量;然而,进行实地考察的生物学家多次提出,鱼的生殖力会随着体重的增大而不成比例地增加。为了更详细地探索这一问题,Diego R. Barneche等对342种海鱼的生殖能量总产出进行了分析。他们的确发现,大多数种类的鱼存在着按比例缩放的模式,即体型较大的母鱼会以指数增加形式生下更多的后代。例如,一条30公斤(kg)重的雌鱼所产的卵要比~28条2-kg的雌鱼(其总体重量为56 kg)还要多;同样地,来自一条30 kg的雌鱼一次所产卵的总能量则是2 kg雌鱼一次所产卵总能量的37倍。作者说,这些结果强调了在海洋鱼群中补充较大体型鱼的重要性。根据大西洋鲭鱼(Scomber scombrus)在面临气候变化时预计发生的体型缩小的估计,作者提出,这将会导致各鱼种中每条鱼的繁殖量减少50%。好消息是,在受到保护的海洋区发现,那里的鱼的体型有所增加,它至少指出了一种未来渔业可持续性发展的解决方案。

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