Record Details

Development of low drag trawls for energy efficient fishing

KRISHI: Publication and Data Inventory Repository

View Archive Info
 
 
Field Value
 
Title Development of low drag trawls for energy efficient fishing
Not Available
 
Creator Remesan, M.P.
Madhu, V.R.
Pravin, P.
 
Subject Not Available
 
Description Not Available
Trawling is the most energy intensive fishing method and fuel cost alone constitute upto 75% of operational
expenditure.It was reported that to catch one kilogram of fish, trawling requires 0.8 kg of fuel. Drag is the single most important factor contributing to the fuel consumption and thereby energy efficiency and profitability of
trawl operations. Drag of trawl depends on factors like the design and rigging of the net and the operating conditions. According to Wileman (1984), the warp contributes 5%, sweeps-4%, otterboards-20%, floats-3%, foot rope-10% and netting- 58% to the total drag. Use of smaller otterboards, adoption of optimized towing speed, thinner twines and large mesh size to reduce twine surface area and opting selective shape of the mesh can bring down the drag and fuel consumption. Similarly, drag reduction is achieved by adopting optimized trawl design with special features. Cutaway top belly shrimp trawl is an example of design improvement for drag and bycatch reduction. Estimation of drag of commercial trawls in Kerala reveal that itranges from 1.37 to 48.94 kN and it is more for fish trawl, followed by cephalopod andleast for shrimp trawl. Stronger materials will
permit the use of thinner twines, leading to less twine area for trawl fabrication. Comparative trials carried out with 24.47 m fish trawls made of high density polyethylene (HDPE) and ultra-high molecular weight polyethylene (UHMWPE) revealed that the average reduction in drag of UHMWPE trawl was 17% with an average reduction in fuel consumption by 10%. The fuel consumption per kilogram of fish captured was estimated as 2.9 liters for HDPE trawls and 1.9 liters for UHMWPE trawls. It is concluded that material substitution, coupled with improvement in trawl design can help significantly in reducing the drag and fuel
consumption to improve the economic feasibility of trawl operations. Besides, by reducing the fuel consumption, a drastic cut in carbon emission can be made.
Not Available
 
Date 2019-11-25T07:07:00Z
2019-11-25T07:07:00Z
2017-11-21
 
Type Other
 
Identifier Remesan, M.P.,Madhu, V.R. and Pravin, P.(2017) Development of low drag trawls for energy efficient fishing. In: (Thomas, S.N., Rao, B.M., Madhu, V.R., Asha, K.K., Binsi, P.K., Viji, P., Sajesh, V.K. and Jha, P.N., Eds.) Fostering Innovations in Fisheries and Aquaculture: Focus on Sustainability and Safety – Book of Abstracts, 11th Indian Fisheries and Aquaculture Forum, ICAR-Central Institute of Fisheries Technology, Kochi and Asian Fisheries Society, Indian Branch, 21-24 November, 2017, Kochi, India, pp. 99-100.
978-81-933623-1-0
http://krishi.icar.gov.in/jspui/handle/123456789/25210
 
Language English
 
Relation Not Available;
 
Publisher ICAR-Central Institute of Fisheries Technology, Kochi and Asian Fisheries Society, Indian Branch