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

自给自足的两个主要目标是最大限度地增长和减少食物浪费。早些时候的研究报告称，自我喂养的触发器(控制食物传递)可能被少数人垄断，他们的胃口可能不能反映整个群体的需求。我们假设，如果我们将不同鱼群的自食性系统结合在一起，这些问题可能会被绕过。18组虹鱼(n=10组)被允许独立接触自食者14-28天。当水箱之间配对自给系统(n=9对，总共12-24天)时，对整个群体日粮没有不利影响。有趣的是，在5个案例中，每对中的一组减少或停止了触发器的启动，并开始依赖其配对的卫星组的触发器触动来运送食物(尽管这并没有导致每日集体配给的减少)。当停止混合自喂并恢复独立接触喂食器时，75%的组几乎立即达到组合前的摄食水平，其余组在10天内达到该水平。在研究的最后一年(H15)，我们扩大了初始实验的规模，使用更大的组(每组50条鲑鱼)和更大的水箱。由于感染问题和相关的死亡，我们不得不暂停补助金，直到疾病问题得到控制。当实验恢复时，我们比较了联合自饲和独立自饲的日粮、生长和食物浪费。与独立的自我喂养制度下的小组相比，联合自我喂养制度下的小组消耗了显著更多的食物，并且表现出显著更好的生长。食物浪费很低(1%)，与喂养制度无关。这些结果表明，组合的自投喂方式是一种成功的大群鱼投喂方法。

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.