Length and age composition of commercial snapper landings in SNA 1 and SNA 8, 2002-03.

By: Walsh, C.
Contributor(s): Middleton, C. (NIWA. Auckland) | Davies, N.M. (NIWA. Auckland).
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment report ; 2004/18.Publisher: Wellington : Ministry of Fisheries, 2004Description: 42 p. : figs. ; 30 cm.ISSN: 1175-1584.Subject(s): SNAPPER | GROWTH | LENGTH | AGING | WEST COAST (NORTH ISLAND) | NORTHLANDOnline resources: Click here to access online In: New Zealand fisheries assessment reportSummary: This report presents the results of Objectives 1 and 2 of the Ministry of Fisheries project "Estimation of snapper year class strength in SNA 1 and 8" (SNA2002/02). The general objective was to determine the length frequency and age structure of commercial landings from the four snapper stocks that constitute SNA 1 and SNA 8 for use in stock assessment models by market sampling. The length frequency and age-length key approach was employed in 2002-03 to estimate catch-at-age for snapper for the main fishing methods in SNA 1 and SNA 8. Length frequency samples were collected from the west coast single trawl and pair trawl fisheries and the Bay of Plenty, Hauraki Gulf, and East Northland longline fisheries. Age data were collected randomly in the form of proportional allocation age-length keys for the west coast and Bay of Plenty fisheries, and using the random age frequency approach for the Hauraki Gulf and East Northland longline fisheries. Target sample sizes for both sampling approaches were achieved from all the fisheries sampled.
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JOURNAL JOURNAL WELLINGTON
JOURNALS
NO. 2004/18 1 Available J09322

This report presents the results of Objectives 1 and 2 of the Ministry of Fisheries project "Estimation of snapper year class strength in SNA 1 and 8" (SNA2002/02). The general objective was to determine the length frequency and age structure of commercial landings from the four snapper stocks that constitute SNA 1 and SNA 8 for use in stock assessment models by market sampling. The length frequency and age-length key approach was employed in 2002-03 to estimate catch-at-age for snapper for the main fishing methods in SNA 1 and SNA 8. Length frequency samples were collected from the west coast single trawl and pair trawl fisheries and the Bay of Plenty, Hauraki Gulf, and East Northland longline fisheries. Age data were collected randomly in the form of proportional allocation age-length keys for the west coast and Bay of Plenty fisheries, and using the random age frequency approach for the Hauraki Gulf and East Northland longline fisheries. Target sample sizes for both sampling approaches were achieved from all the fisheries sampled.

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