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Changes in relative abundance of sharks and rays on Australian South East Fishery trawl grounds after twenty years of fishing

Citation

Graham, KJ and Andrew, NL and Hodgson, KE, Changes in relative abundance of sharks and rays on Australian South East Fishery trawl grounds after twenty years of fishing, Marine and Freshwater Research, 52, (4) pp. 549-561. ISSN 1323-1650 (2001) [Refereed Article]

Copyright Statement

CSIRO 2001

DOI: doi:10.1071/MF99174

Abstract

Upper continental slope trawling grounds (200650 m depth) off New South Wales were surveyed with the same vessel and trawl gear and similar sampling protocols in 197677 (during the early years of commercial exploitation) and in 199697. The 199697 mean catch rate of sharks and rays, pooled for the main 15 species (or species groups), was ~20% of the 197677 mean. Individual catch rates were substantially lower in 199697 for 13 of the 15 species or species groups. The greatest decline was observed for dogsharks of the genus Centrophorus, which were most abundant in 197677 but rarely caught 20 years later. In contrast, 199697 catch rates of spiky dogshark (Squalus megalops) and, to a lesser extent, whitefin swell shark (Cephaloscyllium sp. A) were similar to those in 197677. Trawling during 197981 provided data for nine species, albeit not corrected for larger gear size, and the pooled mean catch rate for sharks and rays in the depth range 300525 m was ~28% of the mean for 197677. The results suggest that the biomass of most species of sharks and rays declined rapidly as the fishery developed and is now at very low levels.

Item Details

Item Type:Refereed Article
Keywords:trawl, elasmobranchs
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries sciences not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Hodgson, KE (Dr Kate Stark)
ID Code:149642
Year Published:2001
Web of Science® Times Cited:122
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2022-04-05
Last Modified:2022-05-24
Downloads:0

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