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Browsing Conference paper (FT) by Author "Boopendranath, M.R."

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    Development of semibalJoon trawl for shrimp
    (Society of Fisheries Technologists (India), 1998) Kunjipalu, K.K.; Pillai, N.S.; Varghese, M.D.; Boopendranath, M.R.; Meenakumari, B.; Mathai, T.J.; Iyer, H.K.
    Two scmiballoon lrawls, one of 22 n1 and the other of 33 rn in head rope length. were developed for catching shrimp effectively from the inshore waters off southwest coast of India. The 22 m semiballoon tr;nd landed 257r shrimp while 33 m semihal!oon trawl lanJed only l57r shrimp in the total catch. Species-wise catch analysis showed significant variations in the composition at different depths.
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    Evaluation of sampling gear for demersal resource surveys
    (Department of Ocean Development, New Delhi, 1996) Boopendranath, M.R.; Panicker, P.A.; Kakati, V.S.; Raje, S.G.; et. al
    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.
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    Harvest technologies for tuna and tuna-like fishes in Indian seas and bycatch issues
    (Society of Fisheries Technologists (India), Cochin, 2008) Pravin, P.; Meenakumari, B.; Boopendranath, M.R.
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    Krill trawl by-catch in Indian Ocean sector of the Antarctic region during austral summer 1995-96
    (Fishery Survey of India, Mumbai (India), 2004) Anrose, A.; Boopendranath, M.R.; Nair, M.K.R.
    Krill trawl by-catch samples were collected at different stations in FAO statistical Fishing Area 58 in the Indian Ocean sector of the Antarctic Ocean during the First indian Antarctic Kriil Expedition(FIKEX) (27 December 1995- 10 March 1996) on board FORV Sagar Sampada by operating three types of Gear, 2.5 m Isaccs Kidd Midwater Trawl (IKMT), 42 M Polish Krill Trawl and 49.5 m Krill Midwater Trawl (Cosmos Trawl, Denmark), 18 hauls were made using 2.5 m IKMT in the area 59°00' - 61"08' S lat., 30"04'-40°04' long. Landed total catch of 161.5 kg. This included a by-catch of 148.815 (Salps 148.81 kg and lantern fishes 0.005 kg)and Antarctic krill, Euphausia supaba 12.69 kg. During 16 aimed trawl operations using krill midwater trawls targeted at Antarctic krill a total catch of 12470 kg was recorded. This included a by-catch of 6833kg and 5673kg of Antarctic krill, Euphausia supcrba. The by-catch 6738 kg was constituted by Salps, followed by 35 kg of jelly fish, 12 kg of krill juveniles, 0.11 kg of latern fish, 5.7kg of squid and 2.7 kg of dagger footh fish. In commercial exploitation of the Antarctic krill, by-catch plays a major role because sorting of krill from by-catch is more difficult in the presence of Salps, jelly fish, juvenile fish, fish larvae etc. Usually if the by-catch constitutes over 20% of the total catch in a haul either the entire catch will be discarded or opt for change of the fishing ground. Therefore, the entire operation for krill is based on the percentage of the by-catch species. As the information on the by-catch of the Fishing area 58 of Southern Ocean is very limited, an attempt is made in this paper to analyse the by-catch and the species in percentage recorded during the First Indian Antarctic Krill Expedition.
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    Large mesh demersal and high opening trawls for finfish and cephalopods
    (Society of Fisheries Technologists (India), 1998) Kunjipalu, K.K.; Boopendranath, M.R.; Pillai, N.S.; Vaeghese, M.D.; Mathai, T.J.; Meenakumari, B.
    Large mesh demersal and high opening trawls were developed for better exploitation of finfish and cephalopods. A 40 m large mesh trawl, a 32 m high opening trawl of six seams and a 32 m demersal trawl of hybrid version were developed and their selective actions studied with respect to different species of fish and shellfish.
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    Results of fishing experiments with square mesh in the cod end of demersal trawls
    (Cochin University of Science And Technology, 1998) Kunjipalu, K.K.; Varghese, M.D.; Pillai, N.S.; Boopendranath, M.R.; Meenakumari, B.
    Fishing experiments are conducted with alternate haul technique and trouser codend method using square mesh codend in contrast to conventional diamond mesh codend in demersal trawls with 30 mm and 20 mm mesh size to assess the comparative retention and experiment of juveniles of both fin fish and shell fish to suggest conservation measures for the trawl industry for better management. Results indicate that more number of smaller size groups of fin fish and shell fish escaped from square mesh codend than that of diamond mesh codend. It is more evident in the case of small mesh size codend with 20 mm mesh and operated in shallow waters. In the case of 30 mm mesh codend, selection was not so significant between square mesh and diamond mesh as the size of mesh is sufficient enough to provide experiment for juveniles. The size of mesh is mote critical rather than the shape of mesh with increasing mesh size in larger meshes. Moreover, juveniles are less represented in offshore and deeper waters. Fabrication, rigging and construction of square mesh codend, trouser codends and fitting of covers for collection of escaped fishes are briefly mentioned.
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    Ring seine for the small pelagic fishery
    (Society of Fisheries Technologists (India), 2010) Edwin, L.; Nasser, M.; Hakkim, V.I.; Jinoy, V.G.; Das, P.H.D.; Boopendranath, M.R.
    The marine fisheries sector in India has witnessed a phenomenal growth during the last five decades both quantitatively and qualitatively. India ranks seventh in position, contributing about 2.72% (3.9 million tonnes including inland and marine production) to the world fish production for about 143.6 million t (FAQ, 2009). The subsistence fisheries during the early 1950s produced about 0.5 million t, annually (Srinath, 2003). At present, the marine fish landings of India is about 3.21 million t with an increase of about 11.3%, compared to the estimate of the previous year (CMFRI, 2009). Out of this production, mechanized sector contributed 74%, followed by motorized (22%) and artisanal sectors (4%), during 2008. Out of marine landings, pelagic resources contributed 71% of the total marine production of Kerala (CMFRI, 2009). Major resources contributing to the pelagic landings were oil sardine (54%), mackerel (13%), carangids (9%), anchovies (6%), tunas (5%), ribbonfishes (4%), seerfishes (2%) and lesser sardines (2%). Ring seine is the most important gear employed for harvesting small pelagic resources like sardines, mackerel and anchovies in the southwest coast of India, especially along the Kerala coast. In Kerala, 86% of oil sardine, 71% of lesser sardines and 67% of mackerel landings were contributed by the ring seine fishery.
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    Shark long lining experiments in the west coast of India
    (Society of Fisheries Technologists (India), Cochin, 1993) George, V.C; Mathai, P.G.; Kunjipalu, K.K.; Patil, M.R.; Boopendranath, M.R.; George, N.A.
    Results of shark long line fishing experiments conducted along the west coast of India are presented in this communication. Specification of experimental gear is described. Results indicate presence of lucrative shark fishing grounds from Angria bank, west of Ratnagiri for commercial exploitation. An overall hooking rate of 7.4% was obtained. Indian flat round bent hooks have been found as effective as Norwegian round bent hooks of size 0/4.
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    Trawl codend selectivity in respect of razorbelly scad
    (Society of Fisheries Technologists (India), 2010) Remesan, M.P.; Pravin, P.; Boopendranath, M.R.
    Tropical shrimp trawl fisheries produce large amounts of bycatch containing various aquatic organisms including juveniles of fish and shellfish of which a substantial quantity is discarded in dead condition. Bycatch is a serious conservation problem because valuable biological resources are wasted, population of rare and endangered species are threatened, stocks that are already heavily exploited are further impacted and may result in changes in the structure of ecosystem (Harrington et al., 2005). Increasing operational expenditure coupled with a dearth of quality fishes in the catch compel the fishermen to maximize the catch by any means. Responsible fishing regime requires that fishing gears should preferentially catch the adult fish at a particular age, which would maximize yield while permitting the juveniles and sub-adults to escape and also minimize the catch of non targeted and protected organisms (Boopendranath and Pravin, 2005). In this context, codend selectivity studies in bottom trawls for maximum number of species is necessary to arrive at an optimum mesh size which will allow juveniles of maximum number of species to escape from a multi species fishery. Moreover, the concept of ecolabelling or "certification" of seafood that do not contribute to overfishing may become mandatory in the near future.