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Catch Rates and Biological Characteristics of Bluntnose Sixgill Sharks in Puget Sound
- Source :
- Transactions of the American Fisheries Society. 139:108-116
- Publication Year :
- 2010
- Publisher :
- Wiley, 2010.
-
Abstract
- The bluntnose sixgill shark Hexanchus griseus is a wide-ranging marine predator and the largest predatory shark in Puget Sound. Biological characteristics of the Puget Sound bluntnose sixgill shark population remain largely undocumented, despite a recent escalation in recreational angling for the species. Standardized longline sampling, supplemented with other opportunistic collections, was used to collect size, sex ratio, and relative catch rate data at three locations during 2006–2008. Fishing trials were also used to examine the effect of soak time, fishing depth, and time of day on catch rates. Captured bluntnose sixgill sharks were exclusively subadults (175–315 cm total length) found in approximately equal sex ratios in all seasons. Catch rates were highest in Elliott Bay, the urbanized port of Seattle, Washington, and were not affected by sampling season. Catch information derived from hook timers implies that the sharks locate and encounter baited hooks relatively rapidly (
- Subjects :
- education.field_of_study
geography.geographical_feature_category
biology
Population
Fishing
Bluntnose sixgill shark
Aquatic Science
biology.organism_classification
Fishery
Geography
Hexanchus
education
Diel vertical migration
Bay
Ecology, Evolution, Behavior and Systematics
Sound (geography)
Sex ratio
Subjects
Details
- ISSN :
- 15488659 and 00028487
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Transactions of the American Fisheries Society
- Accession number :
- edsair.doi...........4c665de8fbb8015db692b6ad40784d30