Based upon its predecessor (the EMG electromyogram transmitter), the coded electromyogram (CEMG2) transmitter represents one of the components of a field-proven system which enables researchers to record physiological data from free-swimming fish.
Designed to be mounted either externally or internally, CEMG2 transmitters measure muscle activity using probes inserted into the musculature of the fish. The CEMG2 Series provides you with a powerful quantitative estimate of the energetic costs associated with physical activity.
EMG tags allow researchers to:
Compatible with Lotek VHF radio receivers: SRX-DL3, SRX 400A W32 or W5XS, SRX 600 or SRX 800
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.
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.
|Model||Physical specifications||Life (days)|
|Weight in air (g)||Weight in water (g)||Size (ØxL) (mm)||2s interval||5s interval|
|CEMG2-R11-18||10||4.9||11 x 54||51||63|
|CEMG2-R11-25||12||5.7||11 x 62||74||89|
|GEMG2-R11-35||15||6.7||11 x 72||104||125|
|CEMG2-R16-25||25||13||16 x 62||178||215|
|CEMG2-R16-33||29||15||16 x 70||245||296|
|CEMG2-R16-50||33||16||16 x 87||356||430|