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| Content Provider | Springer Nature Link |
|---|---|
| Author | Williams, Gregory D. Andrews, Kelly S. Farrer, Deborah A. Bargmann, Gregory G. Levin, Phillip S. |
| Copyright Year | 2011 |
| Abstract | 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. |
| Starting Page | 379 |
| Ending Page | 388 |
| Page Count | 10 |
| File Format | |
| ISSN | 03781909 |
| Journal | Environmental Biology of Fishes |
| Volume Number | 91 |
| Issue Number | 4 |
| e-ISSN | 15735133 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2011-04-15 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Broadnose sevengill shark Length frequency Estuary Sex ratio Maturity Nature Conservation Environment Animal Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology Zoology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Aquatic Science Ecology, Evolution, Behavior and Systematics |
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