4aAO8. Behavioral observations of zooplankton in the Red Sea using the three-dimensional acoustical imaging system Fish TV.

Session: Thursday Morning, December 5

Time: 9:50

Author: Duncan E. McGehee
Location: Woods Hole Oceanogr. Inst., MS 11, Woods Hole, MA 02543
Author: Jules S. Jaffe
Location: Scripps Inst. of Oceanogr., La Jolla, CA 92093-0238
Author: Amatzia Genin
Location: The Hebrew Univ., Eilat 88103, Israel


Fish TV is a three-dimensional acoustical imaging system that has been used successfully to measure the swimming trajectories of individual zooplankters in situ [Jaffe et al., Deep Sea Res. 42, 1495--1512 (1995); McGehee and Jaffe, ICES J. Mar. Sci. 53, 363--369 (1996)]. In order to observe zooplankton behavior at various times of day and night, Fish TV was deployed in July 1994 on an open-water mooring (water depth 280 m) in the Gulf of Aqaba, approximately 1 km from Eilat, Israel, at 27 m depth. Data were collected over several days. Analysis of these three-dimensional acoustical images has resulted in the measurement of thousands of animal (mostly euphausiid) trajectories. The trajectories reveal the behavior of these individuals as they forage during the night in the photic zone, and as they make their downward vertical migration before dawn. [Work supported by the Office of Naval Research, the U.S.--Israel Binational Science Foundation and the National Science Foundation.]

ASA 132nd meeting - Hawaii, December 1996