Cannibalism in Japanese flounder juveniles, Paralichthys olivaceus, reared under controlled conditions
Cannibalism in Japanese flounder juveniles, Paralichthys olivaceus, reared under controlled conditions
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DOI：
10.1016/s0044-8486(99)00256-2
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发表时间：
2000-02
期刊：
影响因子：
4.5
通讯作者：
Shuozeng Dou;T. Seikai;K. Tsukamoto
中科院分区：
文献类型：
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作者：
Shuozeng Dou;T. Seikai;K. Tsukamoto
在实验室条件下研究了沙底质、光照、饥饿、鱼密度和个体大小对牙鲆幼鱼同类相食行为的影响。同类相食的行为（咬和吞咽）显着增加饥饿，除了在黑暗中，在那里少年无法找到和攻击他们的猎物。同类相食发生更频繁地在异质比均匀的大小组。在每个饥饿水平下，光下的同类相食比黑暗中的同类相食更频繁。有足够的食物存在，沙子没有显着影响同类相食的大小少年，但发挥了重要作用，劝阻捕食成员之间的异质大小组。有足够的食物，同类相食的比率普遍较低，有没有显着差异，同类幼鱼的鱼密度水平之间的同类相食。饥饿状态下，高密度组的同类相食率显著高于低密度组。我们的研究结果表明，大小的变化，饥饿和光是影响同类相食的比目鱼少年的主要因素，而沙子和鱼类密度只有有限的影响同类相食，这取决于其他因素的性质。
Laboratory experiments were conducted to determine the effects of sand substratum, light, starvation, fish density and size variation on cannibalism among Japanese flounder juveniles, Paralichthys olivaceus. Cannibalistic behavior (biting and swallowing) increased significantly with starvation except in darkness, where juveniles could not find and attack their prey. Cannibalism occurred more frequently in heterogeneous than in the homogeneous size groups. Cannibalism was more frequent in light than in darkness at each starvation level. With sufficient food present, sand had no significant effect on cannibalism among homogeneous size juveniles, but played an important role in discouraging predation among members of the heterogeneous size groups. With sufficient food present, the rate of cannibalism was generally low and there were no significant differences in cannibalism among fish density levels of the homogeneous juveniles. With starvation, the cannibalism rate was significantly higher in high density groups than in the lower ones. Our results indicate that size variation, starvation and light are the major factors affecting cannibalism in flounder juveniles, while sand and fish density only have a limited effect on cannibalism, depending on the nature of other factors.