The relationship between the development of sensory organ and changes of swimming behavior and optomotor reaction in larvae of patin (Pangasius hypopthalmus) and seabass (Lates calcarifer)

Wong, Stanley Vun Yee (2007) The relationship between the development of sensory organ and changes of swimming behavior and optomotor reaction in larvae of patin (Pangasius hypopthalmus) and seabass (Lates calcarifer). Universiti Malaysia Sabah. (Unpublished)

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Abstract

This experiment was conducted to study the development of sensory organs and the swimming behavior shown by Patin (Pangasius hypopthalmus) larvae and Asian Seabass (Lates calcarifers) larvae. Fish show positive rheotactic swimming behavior when they swim against water flow. Optomotor reaction is the ability of fish to response to pattern of stimulation moving over the eyes. All of the larvae used in this experiment were hatched in UMS hatchery. Swimming pattern, rheotactic behavior, optomotor reaction were observed both in larvae rearing tank and in experimental tanks. Histological observation was carried out to determine the morphology of eye and free neuromasts in both larvae. Patin larvae show clear rheotactic swimming behavior while Seabass show clear optomotor reaction during early larvae stages. Histology observation reveals that Seabass have well developed eyes during early larval stages. Contradictory, Patin larvae have smaller eyes; bigger eye indicates that it contained more visual cells which can improve the acuity and sensitivity of eye. Under microscopic observation, Seabass larvae have long cupulae while Patin larvae have somewhat short and more rounded cupulae. The presence of free neuromasts and the size of cupulae greatly determine the sensitivity of mechanoreception in fish. Broken, deformed cupulae will affect the fish swimming ability. Therefore, it is advisable not to transfer fish during early larvae stages.

Item Type: Academic Exercise
Uncontrolled Keywords: sensory organ, swimming behaviour, patin (Pangasius hypopthalmus), asian seabass (Lates calcarifers, optomotor reaction, larvae stage, cupulae
Subjects: Q Science > Q Science (General)
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 04 Jul 2013 08:44
Last Modified: 23 Oct 2017 06:29
URI: http://eprints.ums.edu.my/id/eprint/6488

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