Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions

The present study was conducted to elucidate the relationship between the larval feeding behavior of African catfish, Clarias gariepinus and their sensory organs. We also sought to reduce the cannibalism and improve larval rearing methods for this species. The feeding behavior of intact and strepto...

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Main Authors:	Mukai, Yukinori, Leong, Seng Lim
Format:	Article
Language:	English
Published:	Academic Journals 2011
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/3/Larval_Rearing_and_Feeding_Behavior_of_African_Catfish.pdf

id	iium-2061
recordtype	eprints
spelling	iium-20612013-12-18T03:23:43Z http://irep.iium.edu.my/2061/ Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions Mukai, Yukinori Leong, Seng Lim SH Aquaculture. Fisheries. Angling The present study was conducted to elucidate the relationship between the larval feeding behavior of African catfish, Clarias gariepinus and their sensory organs. We also sought to reduce the cannibalism and improve larval rearing methods for this species. The feeding behavior of intact and streptomycin-treated larvae was examined under light and dark conditions using Artemia nauplii. The ingestion rates under light versus dark conditions did not vary significantly; furthermore, no difference was observed between intact and streptomycin-treated larvae. These results showed that the feeding behavior of C. gariepinus depends on chemo-sensory senses rather than visual or mechanical senses. In addition, the larvae were reared under normal light conditions (following a diurnal cycle) and continuous dark conditions from the hatching day until they were 20 days old. Although there was no significant difference, the trials under continuous dark conditions tended to have higher survival rates than those under light conditions. Moreover, the larvae reared under dark conditions showed the same growth rate as those under light conditions. The observations of larval behavior in the present study showed that larval activity increased under dim light conditions; the number of fish resting on the bottom of the aquaria decreased, and fewer larvae were bitten by other individuals than under light conditions. The results of this study suggest that higher activity of C. gariepinus under dark conditions reduced the rate of cannibalism and resulted in higher rates of survival compared to light conditions. This study suggests that the survival rate of C. gariepinus larvae can be improved under dark or dim light conditions with low larval densities and adequate access to food. Academic Journals 2011-03-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/2061/3/Larval_Rearing_and_Feeding_Behavior_of_African_Catfish.pdf Mukai, Yukinori and Leong, Seng Lim (2011) Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions. Journal of Fisheries and Aquatic Science, 6 (3). pp. 272-278. ISSN 1816-4927 http://scialert.net/archivedetails.php?issn=1816-4927&issueno=32 10.3923/jfas.2011
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	SH Aquaculture. Fisheries. Angling
spellingShingle	SH Aquaculture. Fisheries. Angling Mukai, Yukinori Leong, Seng Lim Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
description	The present study was conducted to elucidate the relationship between the larval feeding behavior of African catfish, Clarias gariepinus and their sensory organs. We also sought to reduce the cannibalism and improve larval rearing methods for this species. The feeding behavior of intact and streptomycin-treated larvae was examined under light and dark conditions using Artemia nauplii. The ingestion rates under light versus dark conditions did not vary significantly; furthermore, no difference was observed between intact and streptomycin-treated larvae. These results showed that the feeding behavior of C. gariepinus depends on chemo-sensory senses rather than visual or mechanical senses. In addition, the larvae were reared under normal light conditions (following a diurnal cycle) and continuous dark conditions from the hatching day until they were 20 days old. Although there was no significant difference, the trials under continuous dark conditions tended to have higher survival rates than those under light conditions. Moreover, the larvae reared under dark conditions showed the same growth rate as those under light conditions. The observations of larval behavior in the present study showed that larval activity increased under dim light conditions; the number of fish resting on the bottom of the aquaria decreased, and fewer larvae were bitten by other individuals than under light conditions. The results of this study suggest that higher activity of C. gariepinus under dark conditions reduced the rate of cannibalism and resulted in higher rates of survival compared to light conditions. This study suggests that the survival rate of C. gariepinus larvae can be improved under dark or dim light conditions with low larval densities and adequate access to food.
format	Article
author	Mukai, Yukinori Leong, Seng Lim
author_facet	Mukai, Yukinori Leong, Seng Lim
author_sort	Mukai, Yukinori
title	Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
title_short	Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
title_full	Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
title_fullStr	Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
title_full_unstemmed	Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions
title_sort	larval rearing and feeding bahaviour of african catfish, clarias gariepinus under dark conditions
publisher	Academic Journals
publishDate	2011
url	http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/ http://irep.iium.edu.my/2061/3/Larval_Rearing_and_Feeding_Behavior_of_African_Catfish.pdf
first_indexed	2023-09-18T20:09:36Z
last_indexed	2023-09-18T20:09:36Z
_version_	1777407388406513664

Larval rearing and feeding bahaviour of African catfish, Clarias gariepinus under dark conditions

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