Retinomotor response in the larvae of brown-marbled grouper, Epinephelus fuscoguttatus

Mukai, Yukinori and Leong, Seng Lim and Saad, Shahbudin (2012) Retinomotor response in the larvae of brown-marbled grouper, Epinephelus fuscoguttatus. Journal of Fisheries and Aquatic Science, 7 (3). pp. 233-239. ISSN 1816-4927

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Abstract

This study examined the retinomotor responses of 14 28, and 42 d old brown-marbled grouper Epinephelus fuscoguttatus under seven orders of magnitude of light intensities from 0 lx to 100 lx to determine the visual thresholds. The retinomotor response was absent in 14 d old larvae, indicating the absence of the rod visual cells and a reliance on pure-cone retina for vision. The 27–28 d old larvae had rod cells in the retinae and showed weak retinomotor response—the retinal pigment layer was slightly thinner at light intensity <1 lx than at 10–100 lx. The retinae of 42–45 d old grouper showed a clear retinomotor response at 0.1 lx, becoming stronger at 1 lx and higher; 0.1 - 1 lx may be considered the threshold of visual sensitivity of E. fuscoguttatus.

Item Type:	Article (Journal)
Additional Information:	6616/27387
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Institute of Oceanography and Maritime Studies
Depositing User:	Dr. Yukinori Mukai
Date Deposited:	12 Dec 2012 08:48
Last Modified:	18 Dec 2013 11:24
URI:	http://irep.iium.edu.my/id/eprint/27387

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