Aquaculture Science
Online ISSN : 2185-0194
Print ISSN : 0371-4217
Short Papers
Spawning Time of Pacific Saury, Cololabis saira, in an Aquarium Under Controlled conditions
Koji MatsuzakiShinya YamauchiJun Tsuzaki
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2009 Volume 57 Issue 2 Pages 339-340


Ninety-seven individuals of Pacific saury Cololabis saira collected off Kumano in Mie Prefecture on February 6, 2008 were kept in a 30 m3 columnar tank at 15°C. They were reared under light levels adjusted to 1,400 lx between 08:00 to 17:00 and 20 lx between 17:00 to 08:00 using five halogen lamps. Ratio of the total number of eggs spawned between 08:00 to 13:00, 13:00 to 17:00 and 17:00 to 08:00 was 62%, 20% and 18% respectively from March 22 to April 20, 2008. Also as a result of counting spawning behavior per hour, spawning occurred actively between 08:00 to 13:00, while under 20 lx conditions 97% of spawning activity occurred between 06:00 to 08:00. This indicates that Pacific saury probably actively spawned from pre-dawn to noon.

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© 2009 Japanese Society for Aquaculture Research
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