Occurrence and biological characteristics of broadnose sevengill sharks (Notorynchus cepedianus) in Pacific Northwest coastal estuaries

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• 作者：1. Pacific States Marine Fisheries Commission ; 2725 Montlake Boulevard East ; Seattle ; WA 98112 ; USA2. Northwest Fisheries Science Center ; National Oceanic and Atmospheric Administration ; 2725 Montlake Boulevard East ; Seattle ; WA 98112 ; USA3. Marine Fish Program ; Washington Department of Fish and Wildlife ; PO Box?1100 ; La Conner ; WA 98257 ; USA4. Marine Fish Program ; Washington Department of Fish and Wildlife ; 600 Capital Way N. ; Olympia ; WA 98501 ; USA
• 关键词：Broadnose sevengill shark – Length frequency – Estuary – Sex ratio – Maturity
• 刊名：Environmental Biology of Fishes
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：91
• 期：4
• 页码：379-388
• 全文大小：315.5 KB
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• 作者单位：http://www.springerlink.com/content/w530p7781547w103/
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Nature Conservation
  Animal Systematics/Taxonomy/ Biogeography
  Zoology
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5133

文摘

The broadnose sevengill shark (Notorynchus cepedianus) is a high-order marine predator distributed worldwide in shallow coastal waters of temperate seas. Recent reports have suggested it may be a prevalent component of Pacific Northwest coastal estuarine communities, although biological characteristics of the shark population remain undocumented despite growing interest in recreational harvest of the species. Longline sampling was conducted in Willapa Bay and Grays Harbor, Washington, USA seasonally during 2003–2006 to collect sevengill shark size, maturity, and sex ratio data, and establish some baseline catch rate information. Sevengill sharks were collected on 65% of longline sets and catches were composed of subadult and mature individuals (122–283 cm TL) of both sexes. Most male sevengill sharks were large sexually mature adults, based on external clasper calcification levels, whereas most comparably sized females were considered subadults, based on literature-based size-at–maturity estimates. Neonates and young sharks <120 cm were not collected, nor have they been reported in other historic estuary sampling efforts. Sex ratios were skewed toward males in Willapa Bay and suggest some degree of sexual segregation for the species, as has been shown for populations elsewhere. We suggest sevengill sharks are a largely ignored but potentially important predator in Pacific Northwest estuaries. This study therefore provides some of the first, basic information for guiding management decisions associated with a late-maturing, slow-growing shark species in these coastal habitats.