Abstract
Volume-scattering strengths are presented for both daytime and nighttime, measured at three different times, in the same oceanic area during a nine-month period. The data are analyzed in 13-oct bands covering the frequency region from 2.5 to 20.0 kHz. The maximum and minimum variation in scattering strengths over the nine-month period range from 11 to 3 dB. Swimbladder volumes of fishes are determined from the acoustic characteristics of deep scattering layers. A volume of 0.72 cm3 is computed for fish residing at 950 m and 0.022 cm3 for fish at 610 m. Biological sampling of the deep-scattering layers shows the presence of four families of fishes that possess swimbladders: Myctophidae, Gonostomatidae, Sternoptychidae, and Melamphaidae.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
