A test of the individual feeding activity and food size preference in rainbow trout using demand feeders
A test of the individual feeding activity and food size preference in rainbow trout using demand feeders
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使用按需喂食器测试虹鳟鱼的个体进食活动和食物大小偏好
DOI：
10.1007/bf00692663
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发表时间：
1993
影响因子：
2.9
通讯作者：
E. Brännäs
中科院分区：
文献类型：
--
作者：
A. Alanärä;E. Brännäs
研究人员对三组初始体重为 200 至 1000 克的虹鳟鱼的摄食活动和食物大小偏好进行了调查。鱼可以选择从包含 6 毫米或 9 毫米食物颗粒的两个按需喂食装置中的任何一个释放食物。使用专门设计的无源集成应答器（PIT 标签）持续监测个体的咬合活动（以激活食物的释放）。在每个组中，咬合活动受到三个个体的强烈影响，占总数的 70-85%。因此，少数个体的高咬合活动表明社会统治等级的发展。咬伤次数和生长率之间没有统计学上显着的相关性，这表明操作需求喂食器的鱼没有获得任何生长优势。在中型和大型鱼类中都发现了主导喂食器驱动的鳟鱼。没有证据表明主动选择食物大小，并且最常操作喂食器的鱼会保护水箱的某一区域，而不是更喜欢触发能够提供最佳大小食物的触发器。
Feeding activity and food size preferences were investigated in three groups of rainbow trout with initial weights ranging from 200 to 1000 g. Fish were given the option of releasing food from either of two demand feeding devices that contained either 6 mm or 9 mm food pellets. Individual biting activity (to activate release of food) was continuously monitored using specially designed passive integrated transponders (PIT-tags). In each of the groups, biting activity was strongly influenced by three individuals, which accounted for 70–85% of the total. Thus, high bite activity by few individuals indicates the development of social dominance hierarchies. There was no statistically significant correlation between number of bites and growth rate, indicating that the fish that operated the demand feeders did not gain any growth advantage. Trout that dominated the actuation of the feeders were found among both medium- and large-sized fish. There was no evidence of active food size selection, and the fish that most frequently operated the feeders defended one area of the tank rather than preferring the trigger that would have delivered food of the optimal size.