Institute for Muscle Biology and Growth, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany.
Department of Cytology and Evolutionary Biology, Zoological Institute and Museum, University of Greifswald, Greifswald, Germany.
J Fish Biol. 2021 Aug;99(2):425-436. doi: 10.1111/jfb.14734. Epub 2021 Apr 9.
Sander lucioperca is an organism of growing importance for the aquaculture industry. Nonetheless, the rearing of S. lucioperca larvae is proving to be a difficult task as it is facing a high mortality rate during hatching and the change to exogenous feeding. To gain insight into growth patterns during this period, the authors analysed pikeperch embryos and larvae from 9 days before hatching to 17 days after hatch. Hereby they were able to describe a natural development by using close to natural conditions based on using a direct flow-through supply of lake fresh water on specimens from a local wild population. The results show that between the early embryonic stages a steady growth was visible. Nonetheless, in between hatching and the start of exogenous feeding, a phase of growth stagnation took place. In the following larval stages, an increased growth with large size variations between individual specimens appeared. Both factors are conspicuous as they can indicate a starting point for cannibalism. With this analysis, the authors can provide a fundament to support the upcoming research on S. lucioperca and aid to optimize size-sorting procedures for a higher survival of pikeperch stock in aquaculture.
梭鲈是水产养殖业中日益重要的生物。然而，由于在孵化和转变为外源性摄食期间死亡率很高，因此养殖梭鲈幼鱼被证明是一项艰巨的任务。为了深入了解这一时期的生长模式，作者分析了孵化前 9 天到孵化后 17 天的梭鲈胚胎和幼鱼。他们通过使用来自当地野生种群的标本，基于直接流动供应湖水的接近自然的条件，描述了一种自然发育。结果表明，在早期胚胎阶段可见稳定的生长。然而，在孵化和开始外源性摄食之间，生长停滞阶段发生。在随后的幼鱼阶段，个体之间的生长差异增大。这两个因素都很明显，因为它们可能表明开始发生同类相食现象。通过这项分析，作者可以为即将开展的梭鲈研究提供基础，并有助于优化大小分拣程序，以提高水产养殖中梭鲈种群的存活率。
