The development of sensory organs and changes of behaviour in larvae of Patin, Pangasius hypophthalmus

Diyana Ramli, (2007) The development of sensory organs and changes of behaviour in larvae of Patin, Pangasius hypophthalmus. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This study was conducted to examine the development of the sensory organs and changes of behaviour with the larval growth in Patin, Pangasius hypophthalmus for the purpose of understanding its ecology as well as to improve the larval rearing techniques. Eggs were collected from Borneo Marine Researched Institute and the larvae of Patin were reared from hatching to juvenile stage, sampled every day and observed under light microscope for the development of the sensory organs. The larvae were fed with artemia and artificial powder feed. Newly hatched larvae were 4.66±0.02mm (mean ± S.D) in total length (TL), eyes were not yet pigmented, and they lay at the bottom of the tank. At I day-old (TL. 5.60±0.02mm), they have pigmented eyes and the retina had differentiated into a few layers. They already responded to mechanical stimuli and swam vertically. At 2-day-old (TL. 6.79±0.03mm), the retina layers appeared more clearly. They showed positive rheotaxis and they swam horizontally. At 3-day old (TL. 7.19±0.04mm), they showed positive phototaxis and swam very actively. 7-day-old larvae (TL. 9.84±0.038mm), showed negative phototaxis. At 15-day-old (TL. 13.31±0.123mm), the eyes development were completed. At 30-day-old (TL. 21.82±0.3758mm), Patin already reached the juvenile stage. The few neuromasts, taste buds and olfactory pits started to develop at 1-day-old and they were increasing from day to day. The development of those sensory organs and changes of behaviour contributed importantly to the larvae on its ecology at the river and improvement of its larval rearing

Item Type: Academic Exercise
Uncontrolled Keywords: sensory organ, changes of behaviour, larval growth, Patin, Pangasius hypophthalmus, ecology, larval rearing technique
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 21 Nov 2013 04:11
Last Modified: 11 Oct 2017 02:56
URI: http://eprints.ums.edu.my/id/eprint/7623

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