Association behavior of young striped jack Pseudocaranx dentex to a shade of flotsam

Takayuki Kogane, S. Shiozawa, M. Arimoto, Y. Mizuta, K. Tsukamoto
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引用次数: 6

Abstract

Behaviors of the striped jack Pseudocaranx dentex to the shade of flotsam were observed in experimental tanks to determine whether or not the shade would act as a factor to trigger association behavior of fishes to a flotsam.During the daytime, 20 fish of 23cm TL preferred to distribute under the cover which was set on the right half side of a 90m3 outdoor tank, while there was no difference in fish distribution between the right and left sides in a control tank without cover. During the nighttime, however, there was no difference in horizontal distribution between the test and the control tanks. Fish in the test tank tended to distribute at shallower depths than those in the control tank during the daytime, while both fish distributed at the surface during almost all of the nighttime. When the light intensity was increased by more than 10, 000 lx in an outdoor 60m3 tank with a 90×180cm plywood board at the surface, 21 striped jack of 24cm TL distributed in the shade of the plywood board, while they went out of the shade and swam around the tank when the decrease in light intensity exceeded 10, 000 lx. These data suggested that the shade might attract the striped jack and trigger the association behavior. It was also suggested that in marine ranching of the striped jack in coastal waters the feeding station should provide fish with shade to enhance their association behavior and to keep fish at a fixed area in the sea.
幼条短叶假萼花齿对浮体阴影的结合力
在实验池中观察了条纹鲹对漂浮物阴影的行为,以确定阴影是否会成为触发鱼类对漂浮物联想行为的因素。白天,23cm TL的20条鱼倾向于分布在90m3室外水箱右半边设置的盖子下,而在没有盖子的对照水箱中,左右两侧的鱼分布没有差异。然而,在夜间,测试箱和控制箱之间的水平分布没有差异。在白天,试验池中的鱼比对照池中的鱼更倾向于分布在较浅的深度,而在几乎所有的夜间,两种鱼都分布在水面上。室外60m3水箱表面铺有90×180cm胶合板,当光强增加1万lx以上时,21只24cm TL的条纹jack分布在胶合板的阴影处,当光强减少超过1万lx时,它们就会走出阴影,在水箱周围游动。这些数据表明,阴影可能会吸引条纹杰克并引发联想行为。建议在近海放养斑马鱼时,饲养站应提供荫蔽,以增强斑马鱼的结社行为,并使斑马鱼保持在固定的海域内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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