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Beverton and Holt’s yield per recruit model

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Relation http://eprints.cmfri.org.in/12180/
 
Title Beverton and Holt’s yield per recruit model
 
Creator Ganga, U
 
Subject Analytical models
 
Description Yield per Recruit (Y/R) is the expected life time yield per fish recruited into the stock at a
specified age. The Beverton and Holt’s Yield per Recruit model (1957), is a predictive model
that can be used by fishery managers to understand the biological / economical effect
of fishing on the stocks and helps them to take suitable measures to ensure sustainable
yields from the fishery. In the Beverton and Holt (1957) yield equation, the response of a
population to fishing mortality on a per-recruit basis depends on natural mortality (M),
fishing mortality (F),growth rate (K, from the von Bertalanffy growth equation) and the age
(tc) at first capture (depends on gear selectivity). A fishery manager will aim at arriving at a
combination of measures that will ensure that the fish stocks are exploited at such a level
that there is neither growth nor recruitment overfishing, and predictive models employing
the Y/R concept enable these decisions. Maximum yield from a cohort can be realised only
by exploiting it at an age or size (optimum age or length) at which the cohort’s biomass
reaches its maximum. Thus, ideally fishery managers should be implementing exploitation
strategies that do not harvest fish too early (by restricting catches of juvenile fishes) or too
late when most of them would die due to “senility” or similar reasons operated through
natural mortality.
 
Publisher CMFRI; Kochi
 
Date 2017
 
Type Book Section
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/12180/1/19-Beverton%20and%20Holt%27s%20yield%20per%20recruit%20model.pdf
Ganga, U (2017) Beverton and Holt’s yield per recruit model. In: Course Manual Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management. Lecture Note Series No. 2/2017 . CMFRI; Kochi, Kochi, pp. 228-231.