Prediction of cannibalism in juvenile black rockfish,Sebastes schlegelii (Hilgendorf, 1880), based on morphometric characteristics and paired trials |
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| Authors: | Dan Xi Xiumei Zhang Hongjian Lü Zhixin Zhang |
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| Institution: | 1. Lab of Marine Stock Enhancement Ecology, College of Fisheries, Ocean University of China, Qingdao, China;2. Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, College of Animal Science and Technology, Southwest University, Chongqing, China |
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| Abstract: | To predict the occurrence of cannibalism in the culture of larval black rockfish, Sebastes schlegelii, we developed a regression model based on morphometric measurements. First, 156 black rockfish were measured to obtain a theoretical model, that is LT prey = 0.624 LT cannibal + 0.835. Then, 202 trials of paired fish, together with 31 pairs of cannibalistic fish, were used to revise this model, and the practical model was constructed: LT prey = 0.522 LT cannibal + 4.908 (R² = 0.99). According to this equation, the threshold of size ratio was deduced, that is 1.30–1.69, which could be used to grade black rockfish by size and remove potential cannibals. |
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| Keywords: | cannibalism
Sebastes schlegelii
morphometric characteristics paired trials |
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