Electroreception of Constant and Alternating Fields by the Catfish Ictalurus nebulosus.
Abstract
Detection thresholds of a catfish Ictalurus nebulosus to composites of single-frequency square-wave electric fields added to constant electric fields were measured. Thresholds were determined for electrical signals at six different dc to square-wave amplitude ratios ranging from 1:8 to 4:1. Its peak sensitivity was found to be near 5 Hz. The catfish responded primarily to the dc part of the signal when the dc amplitude was much larger than the amplitude of 1 or 5 Hz square waves. Conversely, it responded to the 1 or 5 Hz square-wave part of the signal when the square-wave amplitude was much larger than the dc. But it responded only to the dc part of a dc + 32 Hz composite signal regardless of the relative amplitudes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 21, 1982
- Accession Number
- ADA120443
Entities
People
- C S Johnson