ISSN:
1095-8649
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
To determine the effect of environmental factors on otolith increment deposition in Japanese eel, Anguilla japonicaT. & S., a total of 337 elvers with a tetracycline time mark in the otolith were reared for 50 days under various experimental temperatures (12, 19 and 25°C), feeding rations (fed and unfed) and salinities (one-third sea water of I 2k and fresh water). Fish were sequentially sampled after 5. 15, 30 and 50 days and their sagittal otolith increments were observed. Under fed conditions at 19 and 25°C, daily increment deposition was observed throughout the 50-day period. In unfed groups and/or at 12°C, the rates of increment deposition were reduced sharply after the fifth day and no clear increments were added. No difference was obtained in increment deposition rates between one-third sea water and fresh water groups. Increment deposition rate was independent of otolith and body size.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1095-8649.1991.tb04357.x
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