Water surface tension-related deaths in prelarval red-spotted grouper
Water surface tension-related deaths in prelarval red-spotted grouper
复制标题
与水表面张力相关的幼体红斑石斑鱼死亡
DOI：
10.1016/s0044-8486(00)00354-9
复制
发表时间：
2000
期刊：
影响因子：
4.5
通讯作者：
A. Kusaka
中科院分区：
文献类型：
--
作者：
K. Yamaoka;T. Nanbu;M. Miyagawa;T. Isshiki;A. Kusaka
针对红点石斑鱼幼体前期大规模地表死亡发生的环境变化的影响，进行了三组实验。第一个实验是关于光强度的，结果表明光源强烈地吸引幼虫并朝它冲去。强度为 2000 lx 时死鱼数量最多。第二个实验表明，水面上的油膜完全阻止了大规模水面死亡的发生。第三个实验表明，水流的存在减少了死鱼的数量。这些结果表明水表面张力是发生表面死亡的关键环境因素。当幼虫被来自上方的光吸引到水面时，幼虫体表分泌的粘液起到胶水的作用。油膜剥夺了水面的表面张力，这似乎是防止石斑鱼前期幼体出现大规模水面死亡的关键。在鱼鳔充气之前必须停止使用油膜。
Three sets of experiments were conducted on environmental changes affecting the occurrence of mass surface deaths in the prelarval stage of the red-spotted grouper, Epinephelus akaara. The first experiment, which was on light intensity, showed that a light source attracted the larvae intensely and they dashed toward it. The maximum number of dead fish was at the intensity of 2000 lx. The second experiment showed that an oil film on the water surface completely prevented the occurrence of mass surface deaths. The third experiment showed that the presence of a water current decreased the number of dead fish. These results suggest that water surface tension is a key environmental factor in the occurrence of surface deaths. Mucus secreted on the body surface of prelarvae functions as a glue when larvae are attracted to the water surface by light coming from above. The oil film deprives the water surface of surface tension, which seems to be the key to prevent the occurrence of mass surface deaths in the prelarval stage of groupers. The use of an oil film must be discontinued prior to swim bladder inflation.