Development of sensory organs and changes of behavior in larvae of the sutchi catfish, Pangasianodon hypophthalmus

Mukai, Yukinori and Tuzan, Audrey Daning and Muhamad Shaleh, Sitti Raehanah and Manjaji-Matsumoto, Bernardette Mabel (2010) Development of sensory organs and changes of behavior in larvae of the sutchi catfish, Pangasianodon hypophthalmus. Fisheries Science, 76 (6). pp. 921-930. ISSN 0919-9268 (P), 1444-2906 (O)

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Abstract

Abstract Larvae of the sutchi catfish Pangasianodon hypophthalmus hatch with morphologically immature features, but sensory organs develop rapidly as the fish grow. By 1 day old, yolk-sac larvae showed notochord flexion, and by 2 days old larvae were observed to have consumed a large part of the yolk sac. At this stage, larvae had welldeveloped eyes, olfactory organs with ciliated receptor cells, inner ears with semicircular canals, and numerous taste buds, and they commenced ingestion of rotifers, Artemia nauplii, and artificial compound feed. Two-dayold larvae had many free neuromasts on the surface of the head and flanks and clearly showed rheotaxis. By 20 days old, free neuromasts in postflexion larvae had sunk under the skin. At this later stage, larvae swam against a water current and schooled along the side of the fish tank. Rapid development of sensory organs and notochord flexion would be an adaptation for survival in conditions of flowing water, as in the Mekong River. In this study, we show that development of the lateral line in the postflexion stage seems to be closely related to larval behavior, suggesting that these developments could be essential for sutchi catfish larvae survival.

Item Type:	Article (Journal)
Additional Information:	6616/2093
Uncontrolled Keywords:	Cannibalism, Larvae, Pangasianodon hypophthalmus, Sensory organs, Sutchi catfish
Subjects:	Q Science > QL Zoology S Agriculture > SH Aquaculture. Fisheries. Angling
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Biotechnology Kulliyyah of Science > Institute of Oceanography and Maritime Studies
Depositing User:	Dr. Yukinori Mukai
Date Deposited:	09 Nov 2011 13:05
Last Modified:	09 Nov 2011 13:05
URI:	http://irep.iium.edu.my/id/eprint/2093

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