Re-evaluation of the 32-inch Commercial Size Limit PDF Download
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Author: William G. Clark
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 40
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Book Description
Intrinsic growth parameters of female and male halibut, and the length-specific selectivity of the commercial setline fishery, were estimated by fitting a simple model to catch composition data collected in Areas 2B and 3A in 1990 and 1991. Area-specific schedules of female maturity as a function of length were estimated using data collected during the 1980s. Yield per recruit and spawning biomass per recruit of halibut in Area 2B and 3A were calculated using the new estimates of growth, selectivity, and maturity. The results showed the current 32-inch commercial size limit to be appropriate. (At time of publication in mid-1995, it is clear that halibut life history parameters have changed considerably since 1990. The size limit is therefore being reviewed again.).
Author: William G. Clark
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 40
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Book Description
Intrinsic growth parameters of female and male halibut, and the length-specific selectivity of the commercial setline fishery, were estimated by fitting a simple model to catch composition data collected in Areas 2B and 3A in 1990 and 1991. Area-specific schedules of female maturity as a function of length were estimated using data collected during the 1980s. Yield per recruit and spawning biomass per recruit of halibut in Area 2B and 3A were calculated using the new estimates of growth, selectivity, and maturity. The results showed the current 32-inch commercial size limit to be appropriate. (At time of publication in mid-1995, it is clear that halibut life history parameters have changed considerably since 1990. The size limit is therefore being reviewed again.).
Author:
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Category : Electronic journals
Languages : en
Pages : 186
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Author:
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Category : Fish trade
Languages : en
Pages : 1054
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Author: Roland L. Barger
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Category : Forest surveys
Languages : en
Pages : 26
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Book Description
The timber quality inventory described recognizes and measures the basic stem characteristics and defect features that influence quantity and quality for most primary products. Stem features measured on sample trees include form defects, scar defects, and knot or limb characteristics. Timber inventory data obtained are used in conjunction with standard methods of estimating volume, scaling, and grading to estimate: (1) Gross volume suitable for a primary product; (2) Probable volume reduction due to visual scaling defects, and remaining net volume suited to the product; (3) Quality of the timber in terms of existing grading or quality classification systems.
Author:
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Category :
Languages : en
Pages : 506
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Author:
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Category :
Languages : en
Pages : 842
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Author:
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Category :
Languages : en
Pages : 514
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Author: United States. Army. Corps of Engineers. Jacksonville District
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Category : Environmental impact statements
Languages : en
Pages : 354
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Author:
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Category :
Languages : en
Pages : 312
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Author:
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Category : Iron industry and trade
Languages : en
Pages : 1784
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Book Description
