Acoustic Reflexion Experiments with Perch (Perca Fluviatilis Linn.) to Determine the Proportion of the Echo Returned by the Swimbladder
Open Access
- 1 June 1958
- journal article
- Published by The Company of Biologists in Journal of Experimental Biology
- Vol. 35 (2) , 437-450
- https://doi.org/10.1242/jeb.35.2.437
Abstract
1. Measurements were made under controlled conditions to determine the contribution of the swimbladder to the reflexion of acoustic energy from the perch, Perca fluviatilis. 2. The amplitude of the echo fell by 50% when the swimbladder was emptied; this was observed both when the dorsal surface and when the lateral surface faced the direction of the incident sound energy. 3. The polar diagram of the fish with its natural swimbladder is similar in shape to that obtained with a false ‘Onazote’ swimbladder.Keywords
This publication has 2 references indexed in Scilit:
- Some Echo-Sounding Experiments on FishICES Journal of Marine Science, 1955
- The Swimbladder and the Vertical Movements of Teleostean FishesJournal of Experimental Biology, 1951