Trawl surveys and biomass estimation

Sathianandan, T V and George, Grinson (2015) Trawl surveys and biomass estimation. In: Training Manual Fish Stock Assessment and Management. ICAR- Central Marine Fisheries Research Institute, Kochi, pp. 115-117. ISBN 978-93-82263-07-4

Text Training Manual Fish Stock Assessment and Management_2015_Grinson George.pdf Download (175kB)

Abstract

Estimates of biomass and annual yield can be derived from bottom trawl surveys especially for monitoring demersal fish stocks. But the estimation of total biomass from this based on catch per unit effort estimates involves some crucial assumptions. The mean catch per unit area is an index of the stock abundance. This is on the assumption that it is proportional to the abundance. Using swept area method this index of stock abundance can be converted into an absolute measure of biomass.

Item Type:	Book Section
Uncontrolled Keywords:	Survey; Biomass
Subjects:	Marine Fisheries > Bottom Trawling Marine Fisheries > Fisheries Survey
Divisions:	CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division Subject Area > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division
Depositing User:	Arun Surendran
Date Deposited:	05 Aug 2024 08:57
Last Modified:	05 Aug 2024 08:57
URI:	http://eprints.cmfri.org.in/id/eprint/18689

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