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Studies of external ＆ internal factors affecting to the fish demand-feeding.

影响鱼类摄食的外部和内部因素的研究。

基本信息

批准号：
11660200
负责人：
TABATA Mitsuo
金额：
$ 2.3万
依托单位：
Teikyo University of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

To demonstrate the factors affecting to fish appetite, studies of external (light) and internal factor (biological clock) were performed using demand-feeding rhythms of rainbow trout in the initial year, 1999. Based on the results obtained in the previous year, another external factor, food availability, was added. Then, factors affecting to the fish feeding rhythms were analyzed.1. In the first experiment, 24 rainbow trout were used (B.W.105.52±4.04 g). Fish were kept in tanks (46L) individually in which each demand-feeder being set. Experimental regimes were as follows : (1) light-dark cycle (12hr light : 12hr dark) + constant meal (MM), and (2) food cycle (12hr meal : 12 fast) + constant light (LL). Demand-feeding was recorded and compared under these conditions of (1) followed by (2). The results showed that rainbow trout synchronized to LD and food cycle. They displayed higher activity at either light phase or mealtime. However, activity patterns of demand-feeding were different, showing distinct synchronization to light-dark cycle rather than meal-fast cycle. This result suggests that food is also an important external factor as the same as light-dark cycle despite showing different way of synchronization.2. Involvement of biological clock for the expression of demand-feeding rhythms, free-running rhythms was studied under LL and MM conditions. The results demonstrated higher appearance rate of free-running rhythms in the rainbow trout (95%). The results suggest the existence of biological clock synchronizing to food cycle.3. These results demonstrate that daily cycles of both external factors (light and food availability) and circadian internal factor (biological clock) are affecting to the expression of demand-feeding rhythms in the rainbow trout.

为了阐明影响虹鳟鱼食欲的因素，本研究于1999年以虹鳟鱼的摄食节律为研究对象，研究了外界（光照）和内部（生物钟）因素对虹鳟鱼食欲的影响。在前一年取得的结果的基础上，增加了另一个外部因素，即粮食供应。分析了影响鱼类摄食节律的因素.在第一个实验中，使用24条虹鳟鱼（B.W.105.52 ± 4.04g）。将鱼单独保存在水箱（46 L）中，每个需求喂食器都设置在水箱中。实验方案如下：（1）光暗周期（12小时光照：12小时黑暗）+恒餐（MM）;（2）食物周期（12小时进餐：12小时禁食）+恒光（LL）。在（1）和（2）的条件下记录和比较需求喂养。结果表明，虹鳟鱼对LD和食物循环具有同步性。它们在光照期或进餐期表现出更高的活性。然而，需求-摄食的活动模式不同，表现出明显的同步化的光-暗周期，而不是用餐-禁食周期。这一结果表明，食物也是一个重要的外部因素，同样的光暗周期，虽然表现出不同的同步方式.在LL和MM条件下，研究了生物钟参与需求摄食节律和自由奔跑节律表达的情况。结果表明，虹鳟鱼自由游动节律的出现率较高（95%）。结果表明，存在与食物周期同步的生物钟.这些结果表明，日周期的外部因素（光和食物的可用性）和昼夜内部因素（生物钟）的虹鳟鱼的需求-摄食节律的表达。