Analysis of commercial catch and effort data from the QMA 2 alfonsino-bluenose trawl fishery, 1989-94

By: Langley, A.D. (NIWA. Auckland).
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment research document ; 95/18.Publisher: Wellington, NZ : [unpublished], 1995Description: 13 p.Other title: Analysis of commercial catch and effort data from the QMA 2 alfonsino bluenose trawl fishery, 1989-94.Subject(s): FISHING EFFORT | FISHERY SURVEYS | FISHERY STATISTICS | NEW ZEALAND | BLUENOSE | ALFONSINOOnline resources: Click here to access online In: New Zealand fisheries assessment research document In: New Zealand fisheries assessment research documentSummary: The BNS 2 TACC has been substantially over-caught in the last two fishing years; by 37% in 1992-93 and 51% in 1993-94. Most of the over-catch is attributable to an increase in the reported bycatch of bluenose taken by the alfonsino and gemfish target trawl fisheries. Catch and effort data from the alfonsino and bluenose target trawl fisheries were analysed to investigate trends in bluenose CPUE relative to alfonsino. The analysis revealed a change in the areal distribution of alfonsino target fishing, with an increase in the effort on fishing grounds yielding higher catch rates of bluenose. There was also an increase in the proportion of trawls conducted during the morning and evening, when the catch rate of bluenose could be expected to be relatively high. Both factors are likely to have contributed to the substantial increase in the catch of bluenose taken in the alfonsino-bluenose trawl fishery. (auth.)
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Item type Current location Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON
JOURNALS
NO. 95/18 1 Available J09941
JOURNAL JOURNAL WELLINGTON
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NO. 95/18 2 Available J09942

8 refs; 8 tables; 7 figs; 1 appendix

"Not to be cited without permission of the author"

The BNS 2 TACC has been substantially over-caught in the last two fishing years; by 37% in 1992-93 and 51% in 1993-94. Most of the over-catch is attributable to an increase in the reported bycatch of bluenose taken by the alfonsino and gemfish target trawl fisheries. Catch and effort data from the alfonsino and bluenose target trawl fisheries were analysed to investigate trends in bluenose CPUE relative to alfonsino. The analysis revealed a change in the areal distribution of alfonsino target fishing, with an increase in the effort on fishing grounds yielding higher catch rates of bluenose. There was also an increase in the proportion of trawls conducted during the morning and evening, when the catch rate of bluenose could be expected to be relatively high. Both factors are likely to have contributed to the substantial increase in the catch of bluenose taken in the alfonsino-bluenose trawl fishery. (auth.)

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