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Studies on the improvement of self-feeding system to fasten feeding for cultured fish.

改进养殖鱼类自投食系统加快投食的研究

基本信息

批准号：
14560164
负责人：
TABATA Mitsuo
金额：
$ 1.98万
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：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Two of the primary aims of self-feeding are to maximize growth and minimize food wastage. Earlier work has reported that the self-feeding trigger (which controls food delivery) can be monopolised by a few individuals, whose appetite may not reflect the needs of the whole group. We hypothesized that these problems may be circumvented if we combined the self-feeding systems of different groups of fish.Eighteen groups of rainbow trout (n = 10 group^<-1>) were allowed independent access to self-feeders for 14-28 days. When the self-feeding systems were paired between tanks (n = 9 pairs, for a total of 12-24 days) there was no detrimental effect on overall group ration. Interestingly, in 5 cases, one group from each pair decreased or ceased actuating the trigger, and became dependent on the trigger actuations of its paired 'satellite' group for food delivery (although this did not lead to a reduction in daily group ration). When the combination self-feeding was terminated and independent access to the feeders resumed, 75% of groups attained the pre-combination ration level almost immediately, with the remaining groups reaching the level within 10 days.In the final year of the study (H15), we scaled-up the initial experiment by using larger groups (50 trout per group) and bigger tanks. Due to infection problems and associated mortalities, we had to suspend the Grant-in-Aid until disease problems were brought under control. When experiments were resumed, we compared ration, growth, and food wastage of the combined self-feeding regime versus an independent self-feeding regime. Groups under the combined self-feeding regime consumed significantly more food and exhibited significantly better growth than groups under the independent self-feeding regime. Food wastage was low (< 1%) irrespective of feeding regime. These results suggest that the combined self-feeding regime is a successful method for feeding large groups of fish.

自我喂养的两个主要目标是最大化生长和最小化食物浪费。早期的研究报告称，自我进食触发器（控制食物输送）可以由少数人垄断，他们的胃口可能无法反映整个群体的需求。我们假设，如果我们将不同鱼群的自我进食系统结合起来，这些问题可能会得到解决。十八组虹鳟鱼（n = 10组^<-1>）被允许独立使用自我进食系统14-28天。当自喂食系统在水箱之间配对时（n = 9 对，总共 12-24 天），对整体组配给量没有不利影响。有趣的是，在 5 个案例中，每对中的一组减少或停止启动触发器，并开始依赖其配对“卫星”组的触发器启动来提供食物（尽管这并没有导致每日组配给量的减少）。当组合自喂食终止并恢复独立进入喂食器时，75%的组几乎立即达到组合前的日粮水平，其余组在10天内达到该水平。在研究的最后一年（H15），我们通过使用更大的组（每组50条鳟鱼）和更大的水箱扩大了最初的实验。由于感染问题和相关的死亡率，我们不得不暂停援助资金，直到疾病问题得到控制。当实验重新开始时，我们比较了组合自我喂养方案与独立自我喂养方案的配给、生长和食物浪费。与独立自我喂养制度下的群体相比，联合自我喂养制度下的群体消耗了更多的食物，并且表现出明显更好的生长。无论喂养方式如何，食物浪费都很低（< 1%）。这些结果表明，组合的自我喂食方式是喂养大群鱼类的成功方法。