Use of Tetracycline to Mark Otoliths of American Shad Fry
- 1 July 1987
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 7 (3) , 453-455
- https://doi.org/10.1577/1548-8659(1987)7<453:uottmo>2.0.co;2
Abstract
Fry of American shad Alosa sapidissima were treated with tetracycline antibiotic (50 mg oxytetracycline-hydrochloride/L) by immersion in 1,200-L circular tanks. Treatment duration was 12 h/d for four consecutive days from 15 to 18 d of age. Ninety-eight percent of 57-d-old fish and 82% of 152-d-old fish showed acceptable marks on their otoliths (sagittae). Overall, marked fish treated and held outdoors and exposed to direct sunlight retained discernible marks at a slightly lower rate (85%) than those treated and kept indoors (94%). This technique permits mass marking of intensively cultured American shad fry and provides a means to determine the relative contribution these fish make to emigrating juvenile stocks.Keywords
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