Retention of visible implant tags by juvenile brown trout

Autor:	T. Niva
Rok vydání:	1995
Předmět:	biology Anatomy Aquatic Science biology.organism_classification Left eye Brown trout Stocking Animal science Tissue damage Juvenile Adipose eyelid Implant Ecology Evolution Behavior and Systematics Salmonidae
Zdroj:	Journal of Fish Biology. 46:997-1002
ISSN:	1095-8649 0022-1112
DOI:	10.1111/j.1095-8649.1995.tb01404.x
Popis:	The retention and readability of visible implant (VI) tags were evaluated in juvenile brown trout. The tags were implanted in the adipose eyelid tissue posterior to the left eye, in a total of 6697 fish in 18 groups. During the first year, tag retention increased with tagging experience, from 58 to 64% in 3–summer–old fish and from 86 to 96% in 4–summer–old fish. The effect of fish size at tagging on tag loss was clear in the 3–summer–old groups in 1991 (ANOVA, P= 0.00001). Tag retention in 3–year–old and 4–summer–old fish in 1992 and 1993 varied from 96 to 99% and the handling of the fish after tagging affected retention significantly (t–test, P= 0.0002), the average being 98.7% for those transposed by submerging and 96.5% in those transposed by dropping. After inspection the fish were released into a natural environment. On recapture after 6 months or more the red tags (faded almost to white) and yellow tags (originally close to white) were difficult to distinguish. No infection or tissue damage was found after either inspection or stocking.
Databáze:	OpenAIRE
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