Effects of temperature and delayed initial feeding on the survival and growth of Japanese flounder larvae
Effects of temperature and delayed initial feeding on the survival and growth of Japanese flounder larvae
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DOI：
10.1111/j.0022-1112.2005.00601.x
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发表时间：
2005-02-01
影响因子：
2
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Dou, SZ;Masuda, R;Tsukamoto, K
在控制条件下，研究了初始投喂时间（卵黄耗尽后0、1、2、3和4 d）和温度（15、18和21 ℃）对实验室养殖的牙鲆仔鱼的不归点（PNR）、存活和生长的影响。7（.）7、5（.）2和4（.）分别在15、18和2V C下孵化后2天（dph）。在每个温度下，幼虫的生长没有显着差异之间的延迟初始喂养前1天PNR，但在第一次喂养后，显着下降。在初始摄食同样延迟的处理中，幼虫在18和21摄氏度下的生长速度明显快于15摄氏度。幼虫在15 ℃和18 ℃下的存活率明显高于21 ℃下，当初始摄食同样延迟时。在每个温度下，在PNR之前第一次喂食的幼虫的存活率没有明显差异，而在此之后延迟初始喂食明显降低了它们的存活率。这些结果表明，牙鲆幼鱼的PNR存在负的温度依赖性。幼虫的存活和生长强烈依赖于温度以及初始摄食的时间。高温加速了仔鱼的卵黄耗竭和生长，降低了仔鱼的饥饿耐受力和存活率。为了避免潜在的饥饿死亡，并获得良好的生长，日本比目鱼幼虫必须在15 ℃下在卵黄耗尽后2天内建立成功的初始摄食，在18和21 ℃下均在1天内建立成功的初始摄食。(C)2005年，不列颠群岛渔业协会。
The effects of the timing of initial feeding (0, 1, 2 3 and 4 days after yolk exhaustion) and temperature (15, 18 and 21degrees C) on the point-of-no-return (PNR), survival and growth of laboratory-reared Japanese flounder Paralichthys olivaceus larvae were studied under controlled conditions. The larvae reached PNR on 7(.)7, 5(.)2 and 4(.)2 days-post-hatching (dph) at 15, 18 and 2 V C, respectively. At each temperature, larval growth did not differ significantly among the delayed initial feedings 1 day before PNR but decreased significantly in larvae first fed after that. In the treatments where initial feeding was equally delayed, larvae grew significantly faster at 18 and 21degrees C than at 15degrees C. The larvae survived apparently better at 15 and 18degrees C than at 21degrees C when initial feeding was equally delayed. At each temperature, survival of the larvae first fed before PNR did not differ noticeably, while delayed initial feeding after that apparently reduced their survival. These results indicated that there existed a negatively temperature-dependent PNR in the Japanese flounder larvae. Survival and growth of the larvae strongly depended on temperature as well as the timing of initial feeding. High temperature accelerated the yolk exhaustion and growth of the larvae and thus reduced their starvation tolerance and survival. To avoid potential starvation mortality and obtain good growth, the Japanese flounder larvae must establish successful initial feeding within 2 days after yolk exhaustion at 15degrees C and within 1 day at both 18 and 21degrees C. (C) 2005 The Fisheries Society of the British Isles.