Title

Diel Vertical Movements of a Scalloped Hammerhead, Sphyrna lewini, in the Northern Gulf of Mexico

Document Type

Article

Publication Date

4-1-2013

Department

Coastal Sciences, Gulf Coast Research Laboratory

Abstract

Despite the circumglobal distribution of scalloped hammerheads, Sphyrna lewini (Griffith and Smith, 1834), little information is available regarding fine-scale movement and habitat use patterns for this species. Over a 27-d period, data were collected on diel habitat use and environmental preferences of a 240 cm (total length) female S. lewini. The shark exhibited a consistent and repeated diel vertical movement pattern, making more than 76 deep nighttime dives; the maximum depth reached was 964 m, where the temperature was 5.8 degrees C. The purpose of the nightly oscillatory deep diving pattern is unknown but could possibly represent feeding behavior. These findings represent the first detailed account of S. lewini diel vertical behavior and habitat utilization in the western North Atlantic Ocean.

Publication Title

BULLETIN OF MARINE SCIENCE

Volume

89

Issue

2

First Page

551

Last Page

557