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首页> 外文期刊>Marine ecology progress series >Using oocyte essential fatty acid composition to assess spawner reproductive potential under hypersaline conditions
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Using oocyte essential fatty acid composition to assess spawner reproductive potential under hypersaline conditions

机译：利用卵母细胞必需脂肪酸成分评估高盐条件下产卵繁殖能力

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摘要

Inversion of estuaries in the dry tropics (i.e. salinity increases upstream) against the backdrop of a globally changing climate is forcing migratory clupeid fish species to adapt quickly to modifications in their spawning habitats to ensure reproductive success. Hatching success and survival probabilities of marine fish eggs and early life stages are prone to impairment under high temperature and elevated salinity conditions. Essential fatty acids affect osmoregulation in marine fish early life stages, and deficiencies can therefore be expected to cause elevated offspring mortality under hyperosmotic conditions, ultimately modifying a stock's reproductive potential. Here we show that oocytes spawned by bonga shad Ethmalosa fimbriata inside a hypersaline estuary exhibited significantly higher 20:4 (n-6) proportions (1.6 +/- 0.7% of total fatty acids) than oocytes spawned under marine conditions (0.6 +/- 0.2%). Further, oocyte proportions in 20: 4 (n-6), 20: 5 (n-3), and 20:6 (n-3) were positively correlated with water temperature, water salinity, and female reproductive investment (relative batch fecundity, gonado-somatic index, oocyte dry weight). Oocytes spawned during high temperature/high salinity conditions inside the estuary are therefore likely to develop normally under the prevailing conditions. Reproductive potential was determined to be highest in females spawning inside the estuary at the end of the wet season, when temperatures are high and salinities are less stressful due to freshwater input. Results lead to the conclusion that migratory clupeid fishes can maintain their reproductive potential in hypersaline estuaries and lagoons, which potentially allows for sustainable stock sizes.
机译：在全球气候变化的背景下，干旱热带地区的河口反转（即上游盐度增加）正迫使迁徙的cl类鱼类迅速适应其产卵栖息地的变化，以确保繁殖成功。在高温和高盐度条件下，海水鱼卵和早期生命阶段的孵化成功率和存活率容易受到损害。必需脂肪酸会影响海水鱼类早期生命阶段的渗透调节作用，因此，在高渗条件下，缺乏脂肪酸可导致后代死亡率升高，最终改变种群的繁殖潜力。在这里，我们显示，在高盐河口内，由邦加sha鱼Ethmalosa fimbriata产卵的卵母细胞比在海洋条件下产卵的卵母细胞（0.6 +/-）的比例高出20：4（n-6）（占总脂肪酸的1.6 +/- 0.7％） 0.2％）。此外，卵母细胞比例在20：4（n-6），20：5（n-3）和20：6（n-3）与水温，水盐度和女性生殖投资呈正相关（相对于繁殖力） ，性腺体细胞指数，卵母细胞干重）。因此，在河口内高温/高盐度条件下产卵的卵母细胞很可能在主要条件下正常发育。在湿季结束时，当温度较高且盐分因淡水输入而压力较小时，在河口内产卵的雌性的生殖潜力最高。结果得出结论，迁徙的斜纹鱼类可以在高盐度河口和泻湖中维持其繁殖潜力，这有可能实现可持续的种群规模。

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