Coordinating Working Party on Fishery Statistics (CWP)
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Classifications and Metadata Standards
Methodological standards
 The overall aim for statistics on catch and landings is to report on fisheries contribution to the national economy, to the provision of food (subsistence) and on the total removal of fish and other organisms from their environment. Catch statistics... More
 Catch and landings statistics are for many purposes required as very detailed data e.g. broken down by fleet, gear, season, target species and geographic area or fishing zone. The nationality of landings follows the vessel flag state principle as described... More
 Live weight: Total weight of fish when captured, estimated as if it was alive and prior to processing. More
 Retained catch: Estimated component of the catch which is retained on board during a fishing trip (refer catch concept diagram). An estimate of the retained catch is reported as total live weight of fish retained and in some fisheries the... More
 Product weight: Weight of a fish product, often measured at-sea at the conclusion of processing. Information on product type, product homogeneity and conversion factors is also required in order to interpret product weight. As for landed weight, relevant when calculating... More
 Landed weight: Weight of a product at the time of landing, regardless of the state in which the product is landed. That is, the fish may be inter alia whole, gutted or filleted. Consequently, this measure is of limited use... More
  Nominal catch (also referred to as nominal landings): Landed weight converted to a live weight basis often by use of a conversion factor. Nominal catch is often referred to as the live weight equivalent of the landed weight or... More
  Discarded catch: Estimated component of the catch which is the total live weight of undersized, unsaleable or otherwise undesirable whole fish and other aquatic organisms which are discarded at the time of the capture or shortly afterwards (refer catch... More
  Bycatch: Component of the catch which represents non-targeted fish associated with the catch of the target species or group towards which fishing effort is directed, or other aquatic organisms taken incidentally during the course of fishing (e.g. birds, mammals,... More
 Data collection In industrialized fisheries catches are often recorded in logbooks and these data may be used to derive catch statistics. However, the accuracy of weights measured at-sea and recorded in logbooks depends on the available weighing technology and/or the experience... More
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