Portland State University. Department of Biology
Date of Award
Master of Science (M.S.) in Biology
1 online resource, 21 pages, digitized photocopy of typescript.
Animal communication, Eigenmannia virescens
The extent to which individuals of Eigenmannia virescens modulate their electric organ discharge frequencies to accommodate the frequencies of others of the same species during social interactions was investigated. Recordings of the fish's discharge frequencies, taken with Tektronix 3L5 and 5L4N spectrum analyzers, showed that, although movements of up to 60 Hz in a day may be made, the frequency movements would be made more or less synchronously by all fish in the group. An apparent preference for, and a tendency of the fish to follow one another in frequency, at frequency ratios of 2:3 (a musical fifth), 3:4 (fourth), and even 4:5 (major third) was observed. The appearance of a circadian rhythm was also noticed.
Gaddis, Philip, "Interactions in the Frequencies of Electric Organ Discharge by Eigenmannia Virescens (Sternopygidae, Pisces) During Social Behavior" (1975). Dissertations and Theses. Paper 2157.