Juvenile Shark Abundance Survey Begins

Five SWFSC scientists have left San Diego aboard the NOAA ship David Starr Jordan for the waters off the Channel Islands, where they will conduct a juvenile shark abundance survey. One to three longline operations will be conducted daily to survey primary and alternate longline sites for mako (Isurus oxyrinchus), blue sharks (Prionace glauca) and other  species including common thresher sharks, and swordfish. The objectives of the survey are to 1) tag and release healthy sharks with conventional tags, OTC, and satellite archival tags for age and growth validation and environmental dynamics information; 2) collect biological samples including reproductive, muscle and heart tissue, stomach contents and whole specimens of sharks, billfish, tunas and small coastal pelagic species; 3) record species captured and size to determine distribution by size and area; and 4) conduct night operations for swordfish to assess feasibility of future tagging studies.