Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system

The visual acuity and visual axis of juvenile brown-marbled grouper, Epinephelus fuscoguttatus were determined to get the understanding of their vision in order to develop a demand feeding system. Three juveniles were anaesthetised with MS222 and fixed in Bouin’s solution. The left retina of each ju...

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Main Authors:	Han Tan, Nai, Mukai, Yukinori, Firdaus, Rian Freddie
Format:	Article
Language:	English
Published:	Universiti Malaya 2013
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/33677/ http://irep.iium.edu.my/33677/ http://irep.iium.edu.my/33677/1/nai_2013_visual_acuity.pdf

id	iium-33677
recordtype	eprints
spelling	iium-336772013-12-24T06:21:09Z http://irep.iium.edu.my/33677/ Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system Han Tan, Nai Mukai, Yukinori Firdaus, Rian Freddie SH Aquaculture. Fisheries. Angling The visual acuity and visual axis of juvenile brown-marbled grouper, Epinephelus fuscoguttatus were determined to get the understanding of their vision in order to develop a demand feeding system. Three juveniles were anaesthetised with MS222 and fixed in Bouin’s solution. The left retina of each juvenile was cut into nine regions – the dorso-nasal (DN), dorsal (D), dorso-temporal (DT), nasal (N), bottom (B), temporal (T), ventro-nasal (VN), ventral (V), and ventro-temporal (VT). The specimens were embedded in paraffin, cut into 6 μm thick tangential sections, and stained with haematoxylin-eosin. The density of cone cells (0.01 mm2) in each region was counted in the stained sections. Visual acuity was calculated using cone cell densities and lens diameter. The highest cone cell densities of each of the juveniles were 359 (bottom, B), 394 (temporal, T), and 380 cells/0.01 mm2 (temporal, T), respectively. The estimated visual acuities were 0.068-0.081 in those regions, respectively. These results showed that the visual axis of brown-marbled grouper juveniles was forward. Therefore, the position of the target switch of demand feeding system was set at 2 cm below the water surface. Universiti Malaya 2013 Article PeerReviewed application/pdf en http://irep.iium.edu.my/33677/1/nai_2013_visual_acuity.pdf Han Tan, Nai and Mukai, Yukinori and Firdaus, Rian Freddie (2013) Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system. Malaysian Journal of Science, 32 (1). pp. 24-28. ISSN 1394-3065 http://www.myjurnal.my/public/issue-view.php?id=3799&journal_id=194
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 Han Tan, Nai Mukai, Yukinori Firdaus, Rian Freddie Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
description	The visual acuity and visual axis of juvenile brown-marbled grouper, Epinephelus fuscoguttatus were determined to get the understanding of their vision in order to develop a demand feeding system. Three juveniles were anaesthetised with MS222 and fixed in Bouin’s solution. The left retina of each juvenile was cut into nine regions – the dorso-nasal (DN), dorsal (D), dorso-temporal (DT), nasal (N), bottom (B), temporal (T), ventro-nasal (VN), ventral (V), and ventro-temporal (VT). The specimens were embedded in paraffin, cut into 6 μm thick tangential sections, and stained with haematoxylin-eosin. The density of cone cells (0.01 mm2) in each region was counted in the stained sections. Visual acuity was calculated using cone cell densities and lens diameter. The highest cone cell densities of each of the juveniles were 359 (bottom, B), 394 (temporal, T), and 380 cells/0.01 mm2 (temporal, T), respectively. The estimated visual acuities were 0.068-0.081 in those regions, respectively. These results showed that the visual axis of brown-marbled grouper juveniles was forward. Therefore, the position of the target switch of demand feeding system was set at 2 cm below the water surface.
format	Article
author	Han Tan, Nai Mukai, Yukinori Firdaus, Rian Freddie
author_facet	Han Tan, Nai Mukai, Yukinori Firdaus, Rian Freddie
author_sort	Han Tan, Nai
title	Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
title_short	Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
title_full	Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
title_fullStr	Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
title_full_unstemmed	Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
title_sort	determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system
publisher	Universiti Malaya
publishDate	2013
url	http://irep.iium.edu.my/33677/ http://irep.iium.edu.my/33677/ http://irep.iium.edu.my/33677/1/nai_2013_visual_acuity.pdf
first_indexed	2023-09-18T20:48:41Z
last_indexed	2023-09-18T20:48:41Z
_version_	1777409848260952064

Determination of visual acuity and visual axis of brown-marbled grouper, epinephelus fuscoguttatus to develop a demand feeding system

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