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Does light intensity affect embryonic development of squid (Heterololigo bleekeri)?

Published online by Cambridge University Press:  23 November 2004

Yuzuru Ikeda ,
Kingo Ito  and
Gen Matsumoto
Yuzuru Ikeda
Affiliation:
Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
Kingo Ito
Affiliation:
Aomori Prefectural Fisheries Research Center, Ajigasawa, Aomori 038-2731, Japan
Gen Matsumoto
Affiliation:
Brain Science Institute of RIKEN, Wako, Saitama 351-0198, Japan
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Abstract

The effect of light intensity on the course of embryonic development of squid (Heterololigo bleekeri) was examined. Heterololigo bleekeri embryos at an early stage were incubated in the egg cases under six to seven gradients of light intensities which varied from constant darkness to intensive light >1000 lx (12L:12D for all experimental groups except for the constant darkness group). Duration of hatching in every experimental group ranged from seven to 15 days with a peak for ≈30–50% of total number of hatchlings. However, there were no particular relationships between light intensities and duration of embryonic development, duration of hatching, number of hatchlings at hatching peak, and body size of hatchlings. In all groups, body size of hatchlings increased up to seven days post-hatching and thereafter did not change remarkably. Just after hatching, strongly positive photo taxis was observed for H. bleekeri

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 84 , Issue 6 , December 2004 , pp. 1215 - 1219
Copyright
© 2004 Marine Biological Association of the United Kingdom

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