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Assessment of the ORH 7B orange roughy fishery for the 1995-96 fishing year

By: Clark, M.R. (NIWA. Wellington).
Contributor(s): Field, K.D. (NIWA. Auckland) | NIWA Wellington (N.Z.).
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment research document ; 95/19.Publisher: Wellington, NZ : NIWA, 1995Description: 11 p.Subject(s): ORANGE ROUGHY | COOK STRAIT | FISHERY RESOURCES | STOCK ASSESSMENT | BIOMASSOnline resources: Click here to access online
Incomplete contents:
The fishery in ORH 7B developed off the Cook Canyon in 1985. A TAC was set at about 1500 t to constrain the fishery until more information on stock size became available. It was increased to 1700 t in 1988 as a result of QAA decisions. The TACC has not been caught in the last two fishing years. There has been limited stock assessment research. An assessment made in 1988 used methods to calculate biomass that are no longer considered appropriate. Yield estimates have not been made in recent years. The fishery assessment carried out here incorporates updated landings from 1993-94, analysis of commercial CPUE date from 1985-86 to 1993-94, and results of stock reduction analysis. Understandardised (average catch per tow) and standardised (year effects) CPUE indices both show substantial decreases over the period of the fishery. The indices in 1993-94 were 11% and 2% of 1985-86 levels for the respective analyses. Virgin biomass was estimated from stock reduction analysis on the two sets of CPUE data at between 10 000 t and 15 000 t. Mid-year biomass in 1994-95 was 4-15% of virgin levels. Yield estimates have been calculated. Both Maximum Constant Yield (MCY) and Current Annual Yield (CAY) are of the order of 100-200 t. Current catch levels, and the level of the TACC, are not sustainable, and will not allow the stock to move towards a size that will support the Maximum Sustainable Yield (MSY). (auths.)
In: New Zealand fisheries assessment research document
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Item type Current location Call number Copy number Status Date due Barcode
JOURNAL JOURNAL WELLINGTON
JOURNALS
NO. 95/19 1 Available J09943

16 refs; 6 figs; 9 tables

The fishery in ORH 7B developed off the Cook Canyon in 1985. A TAC was set at about 1500 t to constrain the fishery until more information on stock size became available. It was increased to 1700 t in 1988 as a result of QAA decisions. The TACC has not been caught in the last two fishing years. There has been limited stock assessment research. An assessment made in 1988 used methods to calculate biomass that are no longer considered appropriate. Yield estimates have not been made in recent years. The fishery assessment carried out here incorporates updated landings from 1993-94, analysis of commercial CPUE date from 1985-86 to 1993-94, and results of stock reduction analysis. Understandardised (average catch per tow) and standardised (year effects) CPUE indices both show substantial decreases over the period of the fishery. The indices in 1993-94 were 11% and 2% of 1985-86 levels for the respective analyses. Virgin biomass was estimated from stock reduction analysis on the two sets of CPUE data at between 10 000 t and 15 000 t. Mid-year biomass in 1994-95 was 4-15% of virgin levels. Yield estimates have been calculated. Both Maximum Constant Yield (MCY) and Current Annual Yield (CAY) are of the order of 100-200 t. Current catch levels, and the level of the TACC, are not sustainable, and will not allow the stock to move towards a size that will support the Maximum Sustainable Yield (MSY). (auths.)

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