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Fish biomass estimation by calibrating the echointegrator deflection against catch data

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Relation http://eprints.cmfri.org.in/5225/
 
Title Fish biomass estimation by calibrating the echointegrator deflection against catch data
 
Creator Natarajan, S
Girijavallabhan, K G
Nandakumar, A
Benjamin, R E
 
Subject Acoustics
 
Description Acoustic survey for fish resources was conducted using echosounder (EK-400)
with echointegrator (QD). The echointegrator coupled with echosounder sums-up the
echo signal received. The sum of the echo signal received per nautical mile covered
is an index of the quantum of fish recorded and therefore a measure of the relative
density of fish in surveyed area. It is converted into absolute biomass using the
calibrarion constant obtained by correlating the trawl catch data against the echointegrator
reading corresponding to the opening of the net. The calibration constant thus
arrived at was 1327 kg/n.mile corresponding to 1 mm integrator deflection per
nautical mile covered.
 
Date 1996
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/5225/1/48.pdf
Natarajan, S and Girijavallabhan, K G and Nandakumar, A and Benjamin, R E (1996) Fish biomass estimation by calibrating the echointegrator deflection against catch data. In: Proceedings of the Second workshop on scientific results of FORV Sagar Sampada, 15-17 February 1994, Kochi.