Energy efficiency in trawling operations

Boopendranath, M.R. and George, V.C. and Shahul Hameed, M. (2010) Energy efficiency in trawling operations. Journal of Coastal Environment, 1(1), pp. 53-70.

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Diurnal variation in trawl catches and its influence on energy efficiency of trawler operations are discussed in this paper, based on data on landings of a Japanese factory trawler which operated in the Indian waters during 1992-93. The factory vessel equipped for stern trawling had a length overall of 110 m, GT of 5460 and installed engine power of 5700 hp. Operations were conducted off west coast of India between 31 and 278 m depth contours, using a 80.4 m high opening bottom trawl with an adjusted vertical opening of 7.60.9 m. The catch data was grouped according to the median towing hour, by the time of the day. CPUE obtained was 3713.4 kg.h-1 for day time operations and 1536.6 kg.h-1 for night-time operations. Mean daily catches were 31367 (SE: 2743) for day time operations and 9430 (SE: 966) for night-time operations. Fuel consumption were 0.399 and 0.982 kg fish-1, respectively for day and night-time operations. Total catch and catch components such as threadfin bream, bulls eye, hairtails, trevelly, lizard fish showed significant improvement during day-time operations while swarming crabs showed a significant improvement in the night-time operations. The difference in catch rates between day and night could be attributed to diurnal variation in the spatial distribution and schooling behaviour of the catch categories, their differential behaviour in the vicinity of trawl systems under varying light levels of day and night and consequent effect on catching efficiency and size selectivity at different stages in the capture process. The results obtained in addition to its importance in the operational planning of trawling in order to realise objectives of maximising catch per unit effort and minimising fuel consumption per unit volume of fish caught, has added significance in the use of bottom trawl surveys in stock abundance estimates.

Item Type: Article
Title: Energy efficiency in trawling operations
Personal Creator/Author:
George, V.C.
Shahul Hameed, M.
Refereed: Yes
Journal or Publication Title: Journal of Coastal Environment
Volume: 1
Number: 1
Page Range: pp. 53-70
Date: 2010
ISSN: 2229-7839
Issuing Agency: Central Institute of Fisheries Technology Cochin
Subjects: Ecology
Item ID: 7508
Depositing User: Dr. M.R. Boopendranath
Date Deposited: 27 Dec 2011 13:17
Last Modified: 01 Feb 2013 14:49
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