INVESTIGATION OF ELECTRIC AND MAGNETIC SENSITIVE FISHES.
Final rept., 1 Nov 62-31 Oct 65,
GENERAL DYNAMICS/ELECTRONICS ROCHESTER N Y RESEARCH DEPT
Pagination or Media Count:
Several species of electric and magnetic sensitive fish were investigated. The report describes and summarizes the work and the related behavioral and physiological experiments. The fresh-water electric fishes studied in the laboratory included specimens of South American Electrophoridae, Rhamphichthyidae, Sternarchidae, and Gymnotidae and African Malapteruridae, Mormyridae, and Gymnarchidae. The investigation of these fishes included the study of some of their electric transmitting and receiving organs and their electric activity under different environmental conditions such as water temperature. Also studied was the distortion of the signals emitted by the electric fishes at various distances. The signals were analyzed to determine their coding form, repetition rate, and modulation type. The effect of applying ac and dc stimuli of varying amplitudes to the fishes was also investigated the threshold of their sensitivity to external impulses was thus established. A hypothesis was advanced on the way electro-receptors react to electric stimuli. A behavioral study model is shown. The taxonomy of many electric fishes with some evolutionary aspects is also given. Author
- Anatomy and Physiology