Fishing Technology

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Browsing Fishing Technology by Author "Abbas, M.S."

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    A demersal trawling gear for inshore waters along the west coast
    (Society of Fisheries Technologists (India), Cochin, 1985) Mhalathkar, H.N.; Mathai, T.J.; George, T.P.; Abbas, M.S.
    Results of comprehensive efficiency tests of three tested designs of 15 m bulged-belly, 15.8 m six seam and 29.26 m longwing type trawls in combination with 114 x 57 cm both rectangular flat and horizontal curved wooden otter boards are reported. Of the possible six combinations, the bulged-belly trawl with flat rectangular otter boards has performed better in landing prawns. Further this study has indicated the selective action of the different designs.
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    Mesh selectivity studies on mackerel gill nets
    (Society of Fisheries Technologists (India), Cochin, 1993) Mathai, T.J.; Vijayan, V.; Abbas, M.S.; Doss, R.S.M.; Iyer, H.K.
    Results of mesh selectivity in gill nets for the capture of mackerel Rastrelliger kanagurta (Cuvier) with nets made of nylon twine 210x1x2, 210x1x3 and 210x2x3 in mesh sizes 40,45,50,55 and 60 mm are discussed in this communication. 50 mm mesh size nets made out of nylon twine 210x1x2 were found optimum for the exploitation of commercially accepted size group with a total length of 190-200 mm. The peak value of gilled girth to mesh perimeter ratio for 50 mm nets was found to be 1.1. Linear regressions were fitted for conversion of length to weight and gilled girth to length. Twine size-mesh size relationship was also worked out. 88% of the mackerel caught and 66.1% of the total catch were obtained from dusk operations.
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    On the boat mid-water trawling
    (J.V.H. Dixitulu, 1991) Vijayan, V.; Abbas, M.S.; Mathai, T.J.
    Many workers have attempted the development of a suitable midwa­ ter trawl for operation f10m smaller class of mechanised f ishing vessels in Indian waters. Pcrumal (1966), Sivan et al. (1970), Mhalathkar ct al(1975. 1983) and Varghese (1975)have described their efforts for diver­sification from the conventional bot­tom trawling operations. The mid­ water trawling from smaller class of vessels gains prominence as this method can effectively substitute bot­tom trawling whenshrimpcatchdwin­dles and the economic indices of the trawler drop. Pomfrets (pam• p us spp)Seer fish (Scomberomorus spp). butter fish {Lactarius spp) sil­ ver bar (Chirocentrus spp), ribbon fish (Trich lu rus spp) arcsomeof the quality food fishes inhabiting thecol­ umn layers just above the bottom of the sea. To effectively exploit these pelagic resources, a midwater trawl of proven ability is a must. Work on evolving a suitable midwater trawl and accessories were, therefore taken up by the Goa Research Centre of Central Institute of Fisheries Tech­ nology, resulting in the development of 10.3m unequal panel midwatcr trawl (Fig.! ). The results of oper­ ations conducted with this gear in combination with 120 x 60 em, ver­ tically curved otter boards (Sivan ct 31. op. cit) are incorporated here for the benefit of actua.l users.