Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow

While ayu Plecoglossus altivelis and pale chub Zacco platypus lay their eggs on spawning beds with similar conditions in water flow and bottom sediments in rivers, the former achieves downstream migration after hatching and the latter remains in the river after its emergence from the spawning bed. T...

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Main Authors:	Kawamura, Gunzo, Mukai, Yukinori, Ohta, Hiroyuki
Format:	Article
Language:	English
Published:	Japanese Society of Fisheries Science 1983
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/1/kawamura_mukai_1983_Fisheries_science.pdf

id	iium-11327
recordtype	eprints
spelling	iium-113272012-05-28T05:00:58Z http://irep.iium.edu.my/11327/ Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow Kawamura, Gunzo Mukai, Yukinori Ohta, Hiroyuki SH Aquaculture. Fisheries. Angling While ayu Plecoglossus altivelis and pale chub Zacco platypus lay their eggs on spawning beds with similar conditions in water flow and bottom sediments in rivers, the former achieves downstream migration after hatching and the latter remains in the river after its emergence from the spawning bed. To find out a possible explanation for these markedly different behaviour patterns of the larvae, the eye and neuromast which are important sensory organs in rheotaxis were examined morphologically. Upon hatching, the larval ayu already have morphologically well-developed free neuromasts with cupula and eyes with pure cone retina while the larval pale chub have no developed sensory organds. Thereafter, the eyes and neuromasts of the latter developed fast, and upon its emergence from the spawning bed and exposure to water flow at 4 days old, these sensory organs have already developed almost as well as those of ayu. Both sensory organs of these two larvae were considered functional enough to enable the larvae to respond to water flow visually and mechanically. Therefore, it is suggested that there might be an active behavioural process governing the downward migration of the ayu, such as a choice of downward water flow or an active downward swimming. Japanese Society of Fisheries Science 1983 Article PeerReviewed application/pdf en http://irep.iium.edu.my/11327/1/kawamura_mukai_1983_Fisheries_science.pdf Kawamura, Gunzo and Mukai, Yukinori and Ohta, Hiroyuki (1983) Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow. Nippon Suisan Gakkaishi, 49 (10). pp. 1527-1532. ISSN 0021-5392 https://www.jstage.jst.go.jp/article/suisan1932/49/10/49_10_1527/_pdf http://dx.doi.org/10.2331/suisan.49.1527
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 Kawamura, Gunzo Mukai, Yukinori Ohta, Hiroyuki Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
description	While ayu Plecoglossus altivelis and pale chub Zacco platypus lay their eggs on spawning beds with similar conditions in water flow and bottom sediments in rivers, the former achieves downstream migration after hatching and the latter remains in the river after its emergence from the spawning bed. To find out a possible explanation for these markedly different behaviour patterns of the larvae, the eye and neuromast which are important sensory organs in rheotaxis were examined morphologically. Upon hatching, the larval ayu already have morphologically well-developed free neuromasts with cupula and eyes with pure cone retina while the larval pale chub have no developed sensory organds. Thereafter, the eyes and neuromasts of the latter developed fast, and upon its emergence from the spawning bed and exposure to water flow at 4 days old, these sensory organs have already developed almost as well as those of ayu. Both sensory organs of these two larvae were considered functional enough to enable the larvae to respond to water flow visually and mechanically. Therefore, it is suggested that there might be an active behavioural process governing the downward migration of the ayu, such as a choice of downward water flow or an active downward swimming.
format	Article
author	Kawamura, Gunzo Mukai, Yukinori Ohta, Hiroyuki
author_facet	Kawamura, Gunzo Mukai, Yukinori Ohta, Hiroyuki
author_sort	Kawamura, Gunzo
title	Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
title_short	Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
title_full	Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
title_fullStr	Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
title_full_unstemmed	Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
title_sort	morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow
publisher	Japanese Society of Fisheries Science
publishDate	1983
url	http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/ http://irep.iium.edu.my/11327/1/kawamura_mukai_1983_Fisheries_science.pdf
first_indexed	2023-09-18T20:20:40Z
last_indexed	2023-09-18T20:20:40Z
_version_	1777408085211480064

Morphology of the eye and free neuromast of larval ayu and pale chub and its relation to behaviour in water flow

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