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Title Evaluation of sampling gear for demersal resource surveys
 
Names Boopendranath, M.R.
Panicker, P.A.
Kakati, V.S.
Raje, S.G.
et. al
Date Issued 1996 (iso8601)
Abstract The three demersal trawls evaluated were 38 m HSDT-II, indigenously developed by CIFT for deep sea fishing in Indian EEZ; and two imported designs, viz., 45.6 m Expo model demersal trawl and 50 m fish trawl operated from vessels of FSI and IFP, respectively. Vertical opening at trawl mouth was heighest for 50 m fish trawl (3.2 m), followed by Expo model demersal trawl (2.5 m) and 38 m HSDT-II (2.2 m), due to differences in overall dimensions and design features. Estimate of horizontal opening between otter boards was highest for 38 m HSDT-II probably due to low drag of the gear, followed by 45.6 m and 50 m trawls. Lowest catch per unit effort obtained by 38 m HSDT_II is presumably due to smaller dimensions of the gear, larger codend mesh size and difference in ground ring, in addition to chance factors. However, 38 m HSDT-II scores on several features desirable in demersal sampling gear such as simplicity in design and construction, ease of operation; lower twine surface area and drag; and ground ring suitable for wider range of bottom conditions. Modifications to make it more effective while sampling for crustaceans and small sized finish components are described.
Genre Article
Topic Sampling gear
Identifier Proceedings of the Second Workshop on Scientific Results of FORV Sagar Sampada, (Department of Ocean Development, New Delhi), 1996 ed. by Pillai, V.K. et. al, 469-476