Radio telemetry has been used to obtain relative or qualitative estimates of fish activity, for the most part, through the use of mercury switches. The CEMG2 transmitter, in conjunction with the SRX receiver/dataloggers and peripherals, offers an incomparable means of quantitatively addressing activity and energy budget issues both in the lab and in the field, without the need for mercury switches.
- assessing velocity barriers such as those presented in natural points of difficult passage, or man made barriers including culverts, bridges, dams, etc.
- assessing the effect of temperature or chemical plumes
- designing bypass structures by examining in-situ energy expenditures of fish in response to flow rate changes and structural design changes in ladders, weirs, etc.; and
- effectively monitoring and assessing entrainment in-situ through use of the CEMG2/SRX system on a continuous basis.
Further information regarding surgical procedures, placement of transmitter, operations in the laboratory and the field can be found in:
Weatherley, A.H., Rogers, S.C., Pincock, D.G. & Patch, D.G. (1982). Oxygen consumption of active rainbow trout, Salmo gairdneri Richardson, derived from electromyograms obtained by radiotelemetry. J. Fish Biol. 20, 479-489.
Kaseloo, P.A., Weatherley, A.H., Lotimer, J.S. & Farina, M.D. (1991). A biotelemetry system for transmission of electromyograms in fish as indicators of physical activity. J. Fish Biol.
McKinley, R.S. (1991). Measurements of activity and oxygen consumption for adult lake sturgeon in the wild with radio transmitted EMG signals. Ontario Hydro Research Division. Report CB91-1-K
Thorstad, E.B., Okland, F., FInstad B. & McKinley, R.S. (1998). Development and use of EMG telemetry transmitters recording fish muscle activity. Proceedings of the Nordic Conference on Fish Passage.
Okland, F., Thorstad, E.B., Finstad, B. & McKinley, R.S. (1998). EMG radio transmitters – a new method to record activity, swimming speed and migratory costs in upstream migrating salmonids in situ. Proceedings of the Nordic Conference on Fish Passage.