期刊
JOURNAL OF FISH BIOLOGY
卷 99, 期 2, 页码 425-436出版社
WILEY
DOI: 10.1111/jfb.14734
关键词
larval fishes; morphometry; ontogeny; PCA; Percidae
资金
- European Maritime and Fisheries Fund [MV-II.1-LM-011]
The study analyzed growth patterns of Eurasian perch and found fluctuating growth rates before and after hatching. Larvae exhibited large size variations post-hatching, indicating potential cannibalistic behavior.
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.
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