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<br />be necessary to grind or etch the otoliths prior <br />to U-V examination. <br />--Percent of fish marked, qualittj of mark, and <br />presence and ease of detection of daily growth <br />rings will be noted. and recorded. <br />--Duration of experiment will be for at least 6-8 <br />weeks after marking (possibly longer). <br /> <br />12