WS-CF-2022

Conversion Factor is a crucial value used to calculate green weight using product weight and thus assess the amount of fish withdrawn from the stock. This paper describes factors influencing conversion factor using data collected on Patagonian toothfish within the French EEZ, results emphasise the need to calculate CF with a sub-sample of the catch that is representative of the total catch in Read More
Submitted By:
Mr Nicolas Gasco

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Results from the 2020 Conversion Factor Survey of Members’ vessels participating in CCAMLR toothfish fisheries, undertaken by the CCAMLR Secretariat, are presented in this paper. All Members reported that their vessels utilized the headed, gutted and tailed processing method, however no other product type was uniformly produced by Members or vessels. The provision of Conversion Factors by Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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Conversion factors are an essential parameter used in estimating landed greenweight from the processed product weight of fish on a vessel. Comparisons of observer- and vessel- reported conversion factors for toothfish using the most common processing type by fishery area from 2016 through 2021 showed that observer reported values were more variable and typically higher than vessel reported Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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This paper summarises the sampling procedures, methods for calculations and the vessel use of conversion factors used by New Zealand for its vessels operating in CCAMLR.

Instructions issued to observers going onboard the New Zealand vessels describe the sampling procedures for informing the calculation of conversion factors. Typically, a four-year rolling average is used to issue vessel Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This document describes the different variables influencing conversion factor values and opens discussions on how to take those into account. 

Conversion factors used in the toothfish fishery may vary due to several variables, specifically the weighing and processing method, cut-type, vessel, size of fish and time of year. Using data collected from vessels operating in Subarea 48.3 between 2011 and 2021, this paper attempts to briefly look at the variation in the conversion factor, if any, caused by some of these variables. While it Read More
Submitted By:
Mr James Clark

Approved By:
Dr Chris Darby

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