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Effects of density, starvation and size difference on aggressive behaviour in juvenile yellowtails ( Seriola quinquevadiata )
Author(s) -
Sakakura Y.,
Tsukamoto K.
Publication year - 1998
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1998.tb00607.x
Subject(s) - juvenile , biology , aggression , starvation , fish <actinopterygii> , significant difference , zoology , abiotic component , fishery , ecology , medicine , endocrinology , psychology , developmental psychology
Summary The effects of density, starvation and size difference on aggressive behaviour in juvenile yellowtails. Seriola quinqueradiatu (Temminck and Schlegel), were investigated. When fish were acclimated to densities of 1, 2, 4. 8, and 16 fish L ‐1 , the frequency of aggressive behaviour per fish decreased significantly. Following starvation for 0, 4, 8, 12 and 24 h, the highest aggression was observed at 24 h, while levels of aggression were equal between 0 and 8 h. According to a pair match test from one batch among three groups of different size (total length mni: 16.6 ± 2.0, 21.1 ± 2.1, and 29.7 ± 4.9), the highest aggression was observed in the group with the largest size difference. Therefore, in view of the three parameters investigated, aggressive behaviour in the yellowtail was concluded to be positively starvation‐ and size‐dependent, but negatively density‐dependent. Synthesizing all relevant results, including abiotic factors such as the light condition, a practical method is presented to reduce mortality caused by aggressive behaviour in yellowtail cultures.