Monster Seminar JAM - Sixgill shark research at the Seattle Aquarium: a brief program overview, and preliminary results.
Jeff Christiansen, Life Science, The Seattle Aquarium
The sixgill shark (Hexanchus griseus) is known to occur in Puget Sound and has been sighted by divers and fishermen alike over the years. Surprisingly, little is known about many aspects of its biology and life history. Specifically, there is little information about sixgill shark population structure, home range, breeding pattern and phylogenetic relationships with other adjacent sixgill populations (coastal and Georgia basin). The Seattle Aquarium is attempting to answer some of these natural history questions through individual identification and movement patterns via tagging efforts, and genetic analysis via tissue sampling and hypervariable microsatellite nuclear markers. Sharks are tagged for individual identification and movement patterns by attraction to a baiting station at the aquarium. Genetic samples are collected from live sharks during tagging operations (pole spear biopsy) and from dead sharks (bycatch or beach cast). Here we present initial results from both tagging and genetic data that has given us some insight into individual movement patterns, genetic diversity estimates, and relatedness among Puget Sound and Georgia Basin sixgill sharks.
Date and Time:
February 12, 2009,
11:00 am - 12:00 pm