Abundance Age Sex And Size Statistics For Pacific Herring In Togiak District Of Bristol Bay 2010

Author : Gregory B. Buck
Publisher :
ISBN 13 :
Total Pages : 59 pages
Book Rating : 4.:/5 (933 download)

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Download or read book Abundance, Age, Sex, and Size Statistics for Pacific Herring in the Togiak District of Bristol Bay, 2014 written by Gregory B. Buck and published by . This book was released on 2015 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pacific herring Clupea pallasii total population in the Togiak District of Bristol Bay was monitored for abundance/biomass and sampled for age, size, and sex composition in 2014. Abundance was estimated from aerial surveys with chartered aircraft. Commercial harvest was measured through landing reports filed by commercial fish processors to the Alaska Department of Fish and Game. Herring were sampled from commercial purse seine and gillnet harvests. The 2014 run biomass was estimated at 203,267 tons (184,403 tonnes). Total commercial harvest was 27,205 tons (25,560 tons from the sac roe fisheries with 19,544 tons harvested by purse seine and 6,016 tons by gillnet, and 1,645 tons harvested by the Dutch Harbor food and bait fishery). The preseason allowable exploitation rate is 20% by regulation, and the final exploitation rate was estimated at 13%. A total of 4,670 herring were sampled for age, sex, length, weight, and sexual maturity information between 30 April and 7 May 2014. Ages ranged from 3 to 16 years, with purse seine harvest dominated by age-7 (26%), and -8 (27%) fish, whereas gillnet harvest was dominated by age-7 (22%), and -8 (35%) fish. Mean length and weight of herring from the purse seine fishery samples were 279 mm and 358 g, whereas fish sampled from the gillnet fishery averaged 289 mm and 394 g.