Variation in individual feed consumption rates of intensively reared pikeperch (Sander lucioperca L. 1758) under feeding hierarchy

IF 3.9 1区农林科学 Q1 FISHERIES

Aquaculture Pub Date : 2025-09-02 DOI:10.1016/j.aquaculture.2025.743119

Tamás Molnár , Gábor Beliczky , András Bognár , Béla Urbányi , Ildikó Benedek

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引用次数: 0

Abstract

The final stage of pikeperch (Sander lucioperca L. 1758) domestication, which includes the implementation of selective breeding programs, has only recently started. Beyond growth rate, feed intake and efficiency are also significant economic aspects of the species during selective breeding. Quantifying them on an individual level is challenging, and it is further complicated by the biasing effect of the feeding hierarchy. Our results demonstrate that measuring the individual feed intake over seven consecutive days already achieves a correlation of 0.95 with total intake over the entire period. However, 14 days are required for ICC-based repeatability of the trait to reach 0.95. In our study, we observed 23 feeding hierarchies in 13 of the 18 tanks, resulting in 25 % dominants, 22 % subordinates, and 53 % intermediate individuals for a total of 72 pikeperch fingerlings. The feeding hierarchy influenced all production parameters (feed intake, body weight gain, SGR, FCR) except RFI and survival rate. This resulted in lower and more fluctuating daily feed intake and poorer growth, but similar feed conversion in the subordinate individuals. Since RFI was not influenced by hierarchy formation, it may prove to be a good metric for implementing a selection program for feed efficiency.

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饲养等级下集养大鼠饲料消耗率的变化

猪鲈（Sander lucioperca L. 1758）驯化的最后阶段，包括选择性育种计划的实施，最近才开始。在选择性育种过程中，除了生长率之外，采食量和效率也是该物种重要的经济方面。在个体层面上量化它们是具有挑战性的，并且由于饲养等级的偏差效应而进一步复杂化。我们的研究结果表明，连续7天测量个体采食量与整个时期的总采食量的相关性为0.95。然而，该性状基于icc的重复性需要14天才能达到0.95。在我们的研究中，我们在18个鱼缸中的13个鱼缸中观察到23个摄食等级，结果显示，72只梭鲈鱼种中有25%为优势个体，22%为从属个体，53%为中间个体。饲喂等级对采食量、增重、SGR、FCR等生产参数（RFI和成活率除外）均有影响。这导致日采食量更低，波动更大，生长更差，但下属个体的饲料转化率相似。由于RFI不受等级结构的影响，它可能被证明是实施饲料效率选择计划的一个很好的指标。

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来源期刊

Aquaculture 农林科学-海洋与淡水生物学

CiteScore

8.60

自引率

17.80%

发文量

1246

审稿时长

56 days

期刊介绍： Aquaculture is an international journal for the exploration, improvement and management of all freshwater and marine food resources. It publishes novel and innovative research of world-wide interest on farming of aquatic organisms, which includes finfish, mollusks, crustaceans and aquatic plants for human consumption. Research on ornamentals is not a focus of the Journal. Aquaculture only publishes papers with a clear relevance to improving aquaculture practices or a potential application.