Amanda Borchert, Jacob L Davis, Michael E Barnes
Retention and mortality rates of 243 Rainbow Trout Oncorhynchus mykiss (73-119 mm) implanted with 8, 9, and 10 mm Passive Integrated Transponder (PIT) tags and 173 Brown Trout Salmo trutta (71-86 mm) implanted 8 and 10 mm PIT tags were examined in a hatchery setting. Retention rates were 95.9% for Rainbow Trout and 100% for Brown Trout over the study period. Only six Rainbow Trout ejected tags. With the 8 mm tags, two ejections occurred in the first seven days, one occurred between days nine and 15, and one occurred between days 22 and 50. One Rainbow Trout ejected a 9 mm between days 22 and 50, and another Rainbow Trout ejected a 10 mm tag in the first seven days. There were no significant differences in weight or length of fish that ejected their tags. Over the course of the study, survival was 100% for both species. This study documents that Rainbow Trout can be successfully tagged at a minimum TL of 73 mm and Brown Trout at minimum TL of 71 mm with no adverse effects on tag retention or survival.
English 
Spanish 
Chinese 
German 
French 
Japanese 
Portuguese 
Hindi