F. S. Elle, M. Koenig, K. Meyer
Dec 1, 2010
Citations
1
Influential Citations
18
Citations
Journal
North American Journal of Fisheries Management
Abstract
Abstract Mass marks are useful for evaluating releases of hatchery fishes for management and research purposes. Calcein is a chemical that shows potential for producing a cost-effective batch mark that can be easily applied to large numbers of small fish and can be detected externally by nonlethal means. However, calcein shows some drawbacks related to mark deterioration when exposed to direct sunlight. We evaluated calcein mark retention over time in rainbow trout Oncorhynchus mykiss by using both external (head, fins) and internal structures (otoliths), and we compared mark retention between fish reared in normal outdoor raceways under ambient light conditions and those reared indoors in shaded circular tanks. Calcein marks on rainbow trout that were marked as fry and reared in outdoor raceways deteriorated significantly within 8 d of marking and remained at low or undetectable levels throughout the study. Mark quality was much better for rainbow trout reared indoors but still degraded over the 7-month ...