Fisheries statistics fall into three categories: documenting the removal of fish and other organisms, documenting the fishing effort and the fleets that exploit the resources and documenting the labour force, income, costs and invested capital that is used in this...
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NOMINAL CATCH is most often not obtained as a direct measure but has to be derived and this is usually done by applying a conversion factor to the landed weight.
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Logbooks provide estimates of the catch at sea and for many industrialised fisheries logbook information is available and may be used for a direct estimate of the catch. However, the accuracy of measures recorded on fishing log-sheets depends on available...
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Confidentiality of certain data or data types may be required to protect personal and commercial interests. However, a confidentiality claim is justified only if there is a risk to reveal data that can be referred to individuals or to legal...
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An analysis of how well founded a confidentiality claim is, is based on the key characteristics of the data, use of the data and what disclosure risks need to be protected against. Among the key characteristics of the data particular...
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Conversion factors depend primarily on the species and its morphology. In addition there are a number of elements to consider:
Extent and method of processing on board the fishing vessels. Size of the fish As a...
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FAO maintains records of the conversion factors used by the national authorities through a questionnaire, FISHSTAT CF1, on which the national authorities are requested to indicate the appropriate conversion factors. This is not an annual questionnaire but is distributed on...
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Conversion factors introduce uncertainty in the estimation of the catch and this uncertainty can be considerable when converting highly processed products, e.g. fillets to 'live fresh weight' equivalent. Caution is advised when studying the conversion factors used by the different...
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Most economic statistics are collected using national currencies while much use of the international statistics requires that these data are on a comparable basis, e.g. in USD. Guidance on conversion from local currencies to a common standard, is provided by...
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The CWP Member Organizations' main instrument for the collection of fishery data from the national authorities is the STATLANT system of questionnaires. The essential feature of this system is that the questionnaires are in a standard format and use harmonised...
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