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
Non-reporting of nominal catch is a major concern in some fisheries. Further, many national statistical publications do not use the terms associated with catch and landings with the precise meanings as described in this section. In such publications, nominal catches...
More
Synoptical list of Yearbooks List of yearbooks of fishery statistics Catch Concepts - Diagrammatic Presentation (former Annex B1)
More
In capture fishery and aquaculture statistics, conversion factors are often used when converting the volume or weight of a product at one stage in the production chain to its volume or weight at another stage in the chain. Perhaps the...
More
Conversion factors depend primarily on the species of aquatic organism and its morphology. In addition there are a number of elements to consider:
Extent and method of processing including on board fishing vessels Size of the fish, as...
More
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...
More