Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system

In a demand feeding system, the fish turn on the switch of the feeder to get feed. In order to develop a demand feeding system with an infrared light sensor to which juvenile tiger grouper, Epinephelus fuscoguttatus visually respond, the visual acuity and visual axis of the juveniles were determined...

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Main Authors:	Nai , Tan Han, Leong, Seng Lim, Rian, Freddie Firdaus, Chung, Fan Liau, Mukai, Yukinori
Format:	Conference or Workshop Item
Language:	English English
Published:	2011
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/7725/ http://irep.iium.edu.my/7725/1/Abstract_Tan_Nai_Han_2011.pdf http://irep.iium.edu.my/7725/4/determination_of_visual_axis_of_tiger_grouper_juveniles.pdf

id	iium-7725
recordtype	eprints
spelling	iium-77252012-12-20T06:51:25Z http://irep.iium.edu.my/7725/ Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system Nai , Tan Han Leong, Seng Lim Rian, Freddie Firdaus Chung, Fan Liau Mukai, Yukinori SH Aquaculture. Fisheries. Angling In a demand feeding system, the fish turn on the switch of the feeder to get feed. In order to develop a demand feeding system with an infrared light sensor to which juvenile tiger grouper, Epinephelus fuscoguttatus visually respond, the visual acuity and visual axis of the juveniles were determined to obtain fundamental understanding of their vision. Three farmed juveniles were anaesthetized with MS222 and fixed in Bouin’s solution. The left retinae of each juvenile were cut into nine regions (Figure 1). The specimens were embedded in paraffin, cut into 6 μm thick tangential sections, and stained with haematoxylin-eosin. The density of cone cells (0.01mm2) in each region was counted in the stained sections. Visual acuity was calculated using cone cell densities and lens diameter. The highest cone density of each juvenile was 359 (bottom, B), 394 (temporal, T) and 380 cells/0.01mm2 (temporal, T) respectively. The estimated minimum separable angles of the highest density regions were 4.312×10-3, 3.661×10-3, 3.592×10-3 radian in each juvenile respectively. The estimated visual acuities were 0.068, 0.080 and 0.081 in those regions. These results showed that the visual axis of tiger grouper juveniles was in forward. 2011-03-08 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/7725/1/Abstract_Tan_Nai_Han_2011.pdf application/pdf en http://irep.iium.edu.my/7725/4/determination_of_visual_axis_of_tiger_grouper_juveniles.pdf Nai , Tan Han and Leong, Seng Lim and Rian, Freddie Firdaus and Chung, Fan Liau and Mukai, Yukinori (2011) Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system. In: 8th Annual Seminar on Marine Science & Aquaculture: Sustainable Development & Management of Aquatic Resources, 8-10 March 2011, Kota Kinabalu, Sabah, Malaysia. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	SH Aquaculture. Fisheries. Angling
spellingShingle	SH Aquaculture. Fisheries. Angling Nai , Tan Han Leong, Seng Lim Rian, Freddie Firdaus Chung, Fan Liau Mukai, Yukinori Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
description	In a demand feeding system, the fish turn on the switch of the feeder to get feed. In order to develop a demand feeding system with an infrared light sensor to which juvenile tiger grouper, Epinephelus fuscoguttatus visually respond, the visual acuity and visual axis of the juveniles were determined to obtain fundamental understanding of their vision. Three farmed juveniles were anaesthetized with MS222 and fixed in Bouin’s solution. The left retinae of each juvenile were cut into nine regions (Figure 1). The specimens were embedded in paraffin, cut into 6 μm thick tangential sections, and stained with haematoxylin-eosin. The density of cone cells (0.01mm2) in each region was counted in the stained sections. Visual acuity was calculated using cone cell densities and lens diameter. The highest cone density of each juvenile was 359 (bottom, B), 394 (temporal, T) and 380 cells/0.01mm2 (temporal, T) respectively. The estimated minimum separable angles of the highest density regions were 4.312×10-3, 3.661×10-3, 3.592×10-3 radian in each juvenile respectively. The estimated visual acuities were 0.068, 0.080 and 0.081 in those regions. These results showed that the visual axis of tiger grouper juveniles was in forward.
format	Conference or Workshop Item
author	Nai , Tan Han Leong, Seng Lim Rian, Freddie Firdaus Chung, Fan Liau Mukai, Yukinori
author_facet	Nai , Tan Han Leong, Seng Lim Rian, Freddie Firdaus Chung, Fan Liau Mukai, Yukinori
author_sort	Nai , Tan Han
title	Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
title_short	Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
title_full	Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
title_fullStr	Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
title_full_unstemmed	Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system
title_sort	determination of visual axis of tiger grouper juveniles epinephelus fuscoguttatus, to develop a demand feeding system
publishDate	2011
url	http://irep.iium.edu.my/7725/ http://irep.iium.edu.my/7725/1/Abstract_Tan_Nai_Han_2011.pdf http://irep.iium.edu.my/7725/4/determination_of_visual_axis_of_tiger_grouper_juveniles.pdf
first_indexed	2023-09-18T20:17:15Z
last_indexed	2023-09-18T20:17:15Z
_version_	1777407869949313024

Determination of visual axis of tiger grouper juveniles Epinephelus fuscoguttatus, to develop a demand feeding system

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