Effects of external and surgically implanted dummy radio transmitters on mortality, swimming performance and physiological status of juvenile masu salmon Oncorhynchus masou (Brevoort)

摘要

The effects of external and surgically implanted radio transmitters on juvenile masu salmon were examined. External attachment of transmitters significantly decreased the survival of fish and caused a decreased Ucrit compared with surgical implantation. Although plasma cortisol, plasma glucose, and hematocrit values did not differ significantly among groups, it appears that the most suitable transmitter attachment method for juvenile masu salmon may be surgical implantation.