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Description
Final Report for FRDC Project 2001/061
Pink snapper (Pagrus auratus) is the main commercial and recreational finfish (Kailola et al., 1993) in the Shark Bay region. Pink snapper are distributed along much of the temperate and tropical coasts of Western Australia from east of Esperance on the south coast to north of Shark Bay on the west (Paulin 1990). Previous research using genetics (Johnson et al. 1986), tagging (Moran et al. 2004), and otolith microchemistry (Edmonds et al., 1989, 1999) have shown that pink snapper from the innermost parts of Shark Bay do not mix with the ocean fish
Juvenile pink snapper are found in trawlable habitats throughout the bay, including Denham Sound in the western gulf, which lies within the Shark Bay prawn trawl fishery. Prawn trawlers in Denham Sound catch juvenile snapper as part of their by-catch. Detailed surveys clearly demonstrate that trawling in Denham Sound reduce by 25% the numbers of juvenile snapper that would have survived natural mortality within a one year period (Moran and Kangas 2003).
The effect of this trawled by-catch of juvenile snapper in Denham Sound on future recruitment to the depleted western gulf of Shark Bay snapper stocks is uncertain, largely because it is unknown whether the juvenile snapper in the trawled area would recruit to inner bay (Denham Sound) or ocean stocks. This project aims to use isotope composition of the juvenile portion of the otoliths of adult snapper from both spawning and non-spawning stocks to determine whether, or in what proportion, those snapper as juveniles used nursery grounds in Denham Sound
ISBN
1 887098 159
Publication Date
3-2003
Publisher
Department of Fisheries, Western Australia
City
Perth
Keywords
Snapper, Oceanic pink snapper (Pagrus auratus), Shark Bay, Prawn trawling, Western Australia
Disciplines
Aquaculture and Fisheries | Environmental Indicators and Impact Assessment | Environmental Monitoring | Marine Biology | Natural Resources and Conservation | Natural Resources Management and Policy | Sustainability
Recommended Citation
Gaughan, D J,
Moran, M J,
Ranaldi, M M,
and
Watling, J R.
(2003), Identifying nursery areas used by inner bay and oceanic pink snapper ( Pagrus auratus) to the effect of prawn trawling on inner bay snapper stocks - Final Report for FRDC Project 2001/061. Department of Fisheries, Western Australia, Perth. Book.
https://library.dpird.wa.gov.au/fr_frcr/9
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