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DEFINITION
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A relative measure of the weight or number of fish in a stock, a segment of stock (e.g. the spawners) or an area. Often available in time series, the information is collected through scientific surveys or inferred from fishery data.
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Other Definitions
Information obtained from samples or observations and used as a measure of the weight or number of fish which make up a stock. |
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Northeast Fisheries Centre (1997): http://www.wh.whoi.edu/homepage/tech_terms.html
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A relative quantitative measure of fish density or abundance, usually as a time series. An abundance index can be specific to an area or to a segment of the population (e.g., large fish), or it can refer to abundance stock-wide; the index can reflect abundance in numbers or in weight (biomass). Abundance indices are often based on standardized fishery data (e.g. catch per unit effort, CPUE) data, but fishery-independent abundance indices based on scientific surveys are also used. |
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Modified from Restrepo V. (1999): Annotated Glossary of Terms in Executive Summary Reports of the International Commission for the Conservation of Atlantic Tunas´ Standing Committee on Research and Statistics (SCRS). ICCAT .
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