2013

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Browsing 2013 by Author "Boopendranath, M.R."

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    Performance of sieve net bycatch reduction devices in the seas off Cochin (southwest coast), India
    (Society of Fisheries Technologists (India), 2013) Sabu, S.; Gibinkumar, T.R.; Pravin, P.; Boopendranath, M.R.
    Bottom trawling is widely employed for catching shrimps in India. Due to the multi species nature of Indian fisheries, bottom trawling catches considerable amount of non-shrimp resources, especially juveniles. Performance of two designs of Sieve net Bycatch Reduction Devices was evaluated in the seas off Cochin, southwest coast of India. Designs selected were Sieve net (i) with a 60 mm diamond mesh funnel inside the net and 80 mm diamond mesh outlet codend (Sieve net-60) and (ii) with 50 mm diamond mesh funnel inside the net with 60 mm diamond mesh outlet codend (Sieve net-50). Among the two Sieve nets evaluated, Sieve net-60 performed better in terms of shrimp retention. Bycatch exclusion in Sieve net-60 was about 37% (without jellyfish) and 15% (with jellyfish) while bycatch exclusion in Sieve net-50 operated during non-jelly fish season was 33%. Shrimp loss was 4.5% and 19.5% in Sieve net-60 and Sieve net-50, respectively. Marketable size groups of fishes and crabs were retained in outlet codends of the Sieve net BRDs. Sieve nets can also be efficiently used to exclude jellyfish when they are abound in the shrimp fishing grounds, by keeping the outlet codend open. Sieve net-60 has potential for adoption in tropical trawl fisheries, in order to minimize the impact of shrimp trawling on juveniles and non-targeted species.
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    Seafood ecolabelling
    (Society of Fisheries Technologis(India), 2013) Srinivasa Gopal, T.K.; Boopendranath, M.R.
    Ecolabelling, traceability and related certification schemes are becoming significant features of international fish trade and marketing. Ecolabels are “seals of approval” given to products that are deemed to have fewer negative impacts on the environment than functionally or competitively similar products. There are about 400 ecolabels concerning different products in operation in the world, of which nearly 50 are related to fisheries and aquaculture. Marine Stewardship Council (MSC), Friend of the Sea (FOS), KRAV and Naturland are some of the well-known third party certification and ecolabelling schemes in fisheries. The effectiveness and potential trade implications of ecolabelling programmes have been widely discussed. The adoption of ecolabelling schemes provide additional tools to move towards sustainability of capture fisheries and aquaculture and brings together elements of the market, industry, environmental interests and communities. Different ecolabelling schemes for seafood products and the benefits, issues and challenges in their adoption are briefly reviewed in this paper.
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    Trawl codend selectivity of torpedo scad, megalaspis cordyla (linnaeus, 1758)
    (Society of Fisheries Technologists (India), 2013) Edwin, L.; Thomas, S.N.; Pravin, P.; Remesan, M.P.; Boopendranath, M.R.
    The torpedo scad, Megalaspis cordyla (Linnaeus, 1758) is a moderately large marine fish belonging to family Carangidae. The largest recorded individual was 80 cm long (TL) (Smith-Vaniz, 1984). It is a high level carnivore with a trophic level of 4.40 and feeds on a variety of fish, cephalopods and crustaceans (Kasim, 2003; Rajanna et al., 2006; Vivekanandan et al., 2009). The torpedo scad is distributed throughout the tropical and subtropical waters of the Indian and west Pacific Oceans (Froese & Pauly, 2011). Boopendranath & Pravin (2005) have reviewed trawl selectivity and presented selectivity parameters reported for some fishes caught in Indian waters.