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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Assessment of the nutritional status of field-caught larval Pacific bluefin tuna by RNA/DNA ratio based on a starvation experiment of hatchery-reared fish
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Assessment of the nutritional status of field-caught larval Pacific bluefin tuna by RNA/DNA ratio based on a starvation experiment of hatchery-reared fish

机译：基于孵化场养鱼饥饿实验的RNA / DNA比值评估田间捕捞的太平洋蓝鳍金枪鱼幼鱼的营养状况

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摘要

RNA/DNA ratio is a useful and reliable indicator of the nutritional status of fish larvae and juveniles. In order to assess the nutritional status of field-caught larval Pacific bluefin tuna Thunnus orientalis (Temminck et Schlegel), starvation experiments of hatchery-reared larvae were conducted and changes in the RNA/DNA ratio of fed and starved larvae were analyzed. Starvation experiments were conducted every 3 days after first feeding. The survival rate of Pacific bluefin tuna larvae ranged 10-50% after 1 day of starved conditions and growth retardation was observed immediately. These results suggest that Pacific bluefin tuna larvae have a very low tolerance to starvation. The RNA/DNA ratios of fed larvae were approximately 2.0-4.0. On the other hand, the value of starved larvae significantly decreased to 1.0-3.0. The nutritional status of 3 cohorts of field-caught tuna larvae collected in the northwestern Pacific Ocean was examined based on the value of the RNA/DNA ratio of the 1 day starved larvae. 4.35-25.77% of the cohorts were regarded as the "starving condition", which was negatively correlated to the ambient prey densities. These findings suggest that the nutritional condition of larval Pacific bluefin tuna was influenced by the ambient prey density, and starvation itself and starvation-induced predation could greatly contribute to mortality in the larval period of Pacific bluefin tuna.
机译：RNA / DNA比率是鱼幼体和幼鱼营养状况的有用且可靠的指标。为了评估田间捕捞的幼体太平洋蓝鳍金枪鱼（Temminck等人）的营养状况，进行了孵化场孵化的幼虫的饥饿实验，并分析了喂养和饥饿的幼虫的RNA / DNA比率的变化。第一次喂食后每三天进行一次饥饿实验。饥饿1天后，太平洋蓝鳍金枪鱼幼虫的存活率为10-50％，并立即观察到生长迟缓。这些结果表明，太平洋蓝鳍金枪鱼幼虫对饥饿的耐受性很低。喂食的幼虫的RNA / DNA比约为2.0-4.0。另一方面，饥饿的幼虫的价值显着降低至1.0-3.0。根据1天饥饿的幼虫的RNA / DNA比值，对在西北太平洋收集的3个田间捕捞金枪鱼幼虫的营养状况进行了检查。 4.35-25.77％的人群被视为“饥饿状态”，与周围的猎物密度呈负相关。这些发现表明，太平洋蓝鳍金枪鱼幼体的营养状况受环境猎物密度的影响，饥饿本身和饥饿诱发的捕食可能极大地影响太平洋蓝鳍金枪鱼幼体期的死亡率。

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