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- W3159725997 abstract "The culture of African catfish ( Clarias gariepinus ) faces a number of challenges which have to be addressed in view of the growing economic importance of this fish. The captive larvae and early juveniles are aggressive and cannibalistic, resulting in considerable economic losses and shortage of seed to meet demands of the farmers. Improving larval survival and health while the fish is held in captivity is a subject of great interest. C. gariepinus generates a weak electric discharge during the aggressive interactions with the conspecifics and their electroreceptors are highly sensitive. While very little is known on the role of electroreception in the aggressive behaviour, we attempted a sensory control of the cannibalism in the larvae by applying an excess direct current (DC) stimulus (0.67 V/cm or 2.65 V/cm) and ablated the function of the electroreceptors. The number of surviving individuals and those which were lost were compared between the control and the treated groups. Six trials were conducted involving larvae at the different initial ages, from 4 to 9 days after hatching, and with different observation periods ranging from 5 to 11 days. The electric treatment resulted in higher survival in five trials and the number of fish lost to cannibalism was significantly lower in the treated group than in the control in one trial. While the electrically-ablated electroreceptors might regenerate, the ablation seemed to be effective during whole larval phase. • A sensory control of cannibalism of the African catfish larvae was attempted. • Highly sensitive electroreceptors were selectively ablated by an excess DC stimulus. • The number of survivals was significantly higher in treated groups than control. • The number of missing fish was significantly lower in a treated group than control. • Electroreception is possibly involved in cannibalistic behaviour of this species." @default.
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- W3159725997 date "2021-09-01" @default.
- W3159725997 modified "2023-10-17" @default.
- W3159725997 title "Possible sensory control of cannibalism in the African catfish (Clarias gariepinus) larvae by electrical ablation of electroreceptors" @default.
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- W3159725997 doi "https://doi.org/10.1016/j.aquaculture.2021.736870" @default.
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