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Fish stocks indicators, which is normalized as a 0–100 proximity-to-target score, with 100 representing "at target" and 0 being furthest from the target. Stock assessments provide fisheries managers with the information that is used in the regulation of a fish stock. Biological and fisheries data are collected in a stock assessment.
Fish stocks are subpopulations of a particular species of fish, for which intrinsic parameters (growth, recruitment, mortality and fishing mortality) are traditionally regarded as the significant factors determining the stock's population dynamics, while extrinsic factors (immigration and emigration) are traditionally ignored. Stocks fished ...
Virtual population analysis was introduced in fish stock assessment by Gulland in 1965 based on older work. The technique of cohort reconstruction in fish populations has been attributed to several different workers including Professor Baranov from Russia in 1918 for his development of the continuous catch equation, Professor Fry from Canada in ...
Schaefer published a fishery equilibrium model based on the Verhulst model with an assumption of a bi-linear catch equation, often referred to as the Schaefer short-term catch equation: (,) = where the variables are; H, referring to catch (harvest) over a given period of time (e.g. a year); E, the fishing effort over the given period; X, the ...
The model can be used to predict the number of fish that will be present in a fishery. [2] [3] Subsequent work has derived the model under other assumptions such as scramble competition, [4] within-year resource limited competition [5] or even as the outcome of source-sink Malthusian patches linked by density-dependent dispersal.
Anderson LG and Seijo JC (2010) Bioeconomics of Fisheries Management John Wiley and Sons. ISBN 978-0-8138-1732-3.; Seijo JC, Defeo O and Salas S (1998) Fisheries bioeconomics: Theory, modelling and management FAO Fisheries, Technical paper 368.
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Morphometrics – Measurements which characterise the form, shape and appearance of an animal or plant. Difference in morphometrics, such as colouration, can be used to distinguish different stocks of the same species. Mortality – Mortality is a death rate from various causes, such as the proportion of a fish stock dying annually. See also ...