期刊
JOURNAL OF FISH BIOLOGY
卷 96, 期 6, 页码 1463-1474出版社
WILEY
DOI: 10.1111/jfb.14322
关键词
behavioural tests; early life stages; freshwater fish; predatory behaviour; Sander lucioperca
资金
- European Union's Seventh Framework Programme for research, technological development and demonstration [KBBE-2013-07, GA 603121]
- University of Lorraine
The onset of piscivory in fish, resulting in a shift from zooplankton or invertebrate to fish prey, was studied on pikeperch (Sander lucioperca) larvae displaying and not displaying piscivorous behaviour at different ages (23, 30, 37, 44 and 52 days post-hatching) using behavioural (attack, capture and swimming activity), morphological (allometry) and digestive enzymatic (trypsin, alpha-amylase and pepsin) analyses. The shift from zooplanktonic food items (Artemia nauplii) to a piscivorous diet did not occur at the same time for all individuals within the same cohort. Predation tests, conducted under controlled conditions (20 degrees C; ad libitum feeding), showed that some larvae attacked fish prey as early as the age of 3 weeks [11.0 +/- 1.3 mm total length (TL)], whereas others did not start until the age of 6 weeks (16.6 +/- 1.9 mm TL). Piscivorous individuals were bigger, with larger heads, longer tails, higher acid protease and lower alkaline protease activities, than non-piscivorous conspecifics. In conclusion, high interindividual variability in morphological and digestive system developments linked to the development of predatory abilities could induce cannibalism in fish.
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