Conference paper (FT)

Permanent URI for this collection

http://localhost:4000/handle/123456789/305

Browse

Browsing Conference paper (FT) by Issue Date

Filter results by year or month
Now showing 1 - 20 of 58
  • Item
    Observation of the Inter relation of Marine Corrosion and Fouling ina tropical environment
    (Marine Biology ,6th international congress on marine Corrosion and fouling, 1984-09-08) Ravindran, K; Pillai, A.G.Gopalakrishna
    Intense pitting ,tunneling and perforations of SS304 under heavy deposite of fouling limit the use of this alloy in ocean engineering .Carbon steel ,Al 2S and Al M57S were free from pitting .Fouling in general was very heavy on all metallic surfaces and a maximum fouling load of 21.9 kg m-2 was observed on non-toxic metal.Based on the fouling load Cochin port appears to fall under fouled port.
  • Item
    Corrosion behaviour of metallic fastenings in contact with wood
    (Society of Fisheries Technologists(India),Cochin, 1985) Ravindran, K.; Pillai, A.G.G.; Balasubramaniam, R.
    The work reports the performance of fastenings made of iron, aluminium, galvanised iron, cadmised iron and aluminised iron in contact with Adina cardifolia artocarpus hirsuta, Lagerstroemia lanceolata, Mangifera indica and Tectona grandis as well as timbers treated with arsenic-copper-chromate preservatives. Quantitative corrosion rates of fastenings or special corrosion cylinders driven into wood-fastenings combinations exposed to fine mist of seawater and distilled water in large test chambers are given. The pH values of some common Indian boat building timbers on incubation with seawater, distilled water and the influence of acidity on corrosion of fastenings are reported. The studies have shown that aluminised iron fastenings are compatible with several boat buiding timbers and can be used in place of expensive copper base alloys without sacrificing.
  • Item
    Polypropylene Netting Yarns
    (Society of Fisheries Technologists (India)Cochin, 1985) Meenakumari, B; Radhalakshmi, K; Nayar, S.Gopalan
    Polypropylene is a non-apparel fibre popular in the west because of its inherent properties and versatility. It is melt spun from polypropylene resin. First introduced in 1954 in Italy (Klust, 1964) its production started in India in 1976 and only in the eightees its use as a multifilament yarn for the benefit of the fishing industry was envisaged. This paper deals with (he first set of twines made available in the country for fish net and makes a comparison with polyamide multifilament twines because of the latter's pre-eminence in the fishing industry.
  • Item
    Copper creosote - a new preservative for marine wooden structres
    (Society of Fisheries Technologists(India),Cochin, 1985) Ravindran, K.; Pillai, A.G.G.; Nair, N.U.
    The affinity of certain components in creosote towards inorganic salts was explored. Copper oxide on heating with ereosote produces stable compounds which are found to be biologically active. Data regarding preparation of copper creosote, and TBTO-fuel oil mixture are presnted. Data relating to the evaluation of the effectiveness of preservatives by bending modulus test are also presented.
  • Item
    An account of trawl fishing off Kakinada
    (Society of Fisheries Technologists(India),Cochin, 1985) Narayanappa, G.; Sitaramarao, J.; Ramarao, S.V.S.; Naidu, R.M.; Satyanarayana, A.V.V.
    In the present communication the authors have reviewed the trends of bottom trawling for the last one and a half decades off Kakinada. Performance of various designs of two-seam and four-seam trawls was also assessed. On an average the catch rate was found to be 33.3 kg h-1. The five yearly landings were worked out for three periods, 1967-71 period to be the most productive. There is considerable reduction in the catch per unit effort during 1972-76 and 1977-81 periods. The catch rate was lowest during 1977-78. An attempt to correlate the catch with the increase in the number of fishing boats from year to year.
  • Item
    Developing an oceanic tuna fishery in Indian EEZ
    (Central Institute of Fisheries Nautical and Engineering Training, Coc, 1987) Swaminath, M.; Nair, M.K.R.; Pravin, P.
    The results of tuna longlining training activities conducted in the Indian EEZ are summarized. The following aspects were examined in particular: 1) proper and effective use of navigational aids; 2) meteorological and oceanographic observations to locate tuna grounds; 3) proper rigging and maintenance of gear; and 4) post-harvest operations of fish handling on board. Findings indicate good prospects for the commercial exploitation of oceanic tuna in the area.
  • Item
    A need based programme of training in gear fabrication and gainful empolyment scheme for fisher women
    (Society of Fisheries Technologists(India),Cochin, 1988) Meenakumari, B.; Panicker, P.A.
    In the coastal area of India there is a large mass of backward and economically weaker section of the rural community – the fishermen. They form a powerful income and employment generating sector producing the main stay of the fishery resources are still far below the average national per capita income group. The fisherwomen constituting nearly half of over fisher folk involved themselves directly and indirectly in the various fisheries activities are still kept at a very low status in the social hierarchy. This development programmes are aimed for uplift of this weaker section and our technological innovations are moulded and translated to suit their requirements, there cannot be any real progress. The fisher folks irrespective of men and women are the best masters in their occupation and they can be the best managers also if they are properly groomed.
  • Item
    Experiments with polyethylene yarn gill nets
    (Society of Fisheries Technologists (India), Cochin, 1993) Radhalakshmi, K.; Sivan, P.M.; Paul, V.
    Experiments were conducted with polyethylene yarn gill nets in comparison with nylon twine gill nets used by artisanal fishermen at three centres in Cochin area. Catch details from the two types of nets are compared and it was found that polyethylene yarn can be considered as an alternate material for nylon twine in fine gill nets.
  • Item
    Relative efficiency of trammel nets and simple gill nets - A preliminary study
    (Society of Fisheries Technologists (India), Cochin, 1993) Thomas, S.N.; Kuttappan, A.C.; George, V.C; Paul, V.; Iyer, H.K.
    This paper presents the results of comparative fishing tests with trammel nets and simple gill nets operated off Cochin. Trammel nets of polyamide mulitfilament with inner webbing of mesh size 34.0, 38.0, 40.0 and 50.0 mm were compared with polyamide monofilament simple gill nets of corresponding mesh size. Trammel nets and simple gill nets of 34.0 and 38.0 mm mesh size gave better results with respect to catch per unit area. Among them, trammel nets gave better output.
  • Item
    Combination Netting yarns for Low Energy Fishing
    (Society of Fisheries Technologists(India),Cochin, 1993) Cecily, P.J.; Samuel, C.T.
    The fishing industry to familiar with the physical properties of netting yarns made of polyamide (PA), polyethylene (PE) and polypropylene (PP). The characteristics of netting yarns used for fish nets depends on the basic characteristics of fibre and yarns and mods of preparation. This paper deals with the studies on mixing of different synthetic yarns for the production of combination netting yarns. The analysis of physical properties shows that combination twines effectively combines the intrinsic characteristics of the component yarns giving a wider choice of material for low energy fishing.
  • Item
    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.
  • Item
    Development of chemical preservatives and coatings to offset biodeterioration in traditional fishing craft.
    (Society of Fisheries Technologists (India), Cochin, 1993) Nair, N.U.; Pillai, A.G.G.; Ravindran, K.
    The present communication presents a summary of the findings of the authors in the development of chemical preservatives and surface coatings to offset biodeterioration in fishingcraft. Fortification of creosote had distinct advantage over straight creosote with reference to loading, toxicity and price. Fortified creosote application is 50% cheaper than traditional methods with better prophylactic properties. Possibilities of combining antifouling and antiborer properties in one polymeric matrix with suitable additives and biotoxin are also highlighted.
  • Item
    Operation of multi-meshed gill nets in Kakinada bay
    (Society of Fisheries Technologists (India), Cochin, 1993) Narayanappa, G.; Rao, S.V.S.R.; Rao, J.S.; Naidu, R.M.
    This communication deals with the results obtained with the multi mesh gill nets in Kakinada bay operated from a traditional Nava. Multi-meshed gill nets with three different mesh sizes namely, 30 mm, 40 mm and 50 mm with depth-wise arrangement were operated along with traditional gill nets of same mesh sizes to evaluate the relative catch efficiency of the different mesh sizes. These investigations revealed the effectiveness of 30mm meshsize over the rest and the predominance of Clupeids in the catches.
  • Item
    Fish harvesting systems in Indian reservoirs
    (Society of Fisheries Technologists (India), Cochin, 1993) Khan, A.A.; Kartha, K.N.; Dawson, P.; George, V.C
    The present communication is an effort to enumerate the various fishing gear systems deployed in Indian reservoirs for the judicious exploitation of commercial varieties of fish. The authors have attempted to describe the indigenous gear used as well as improvements effected in them. Mention is also made on newer gear developed and introduced
  • Item
    Relative catch efficiency of newer fishing gear materials
    (Society of Fisheries Technologists (India), Cochin, 1993) Khan, A.A.; Dawson, P.; Kartha, K.N.
    Investigations on the relative catch efficiency of gill nets fabricated with twines of polypropylene( PP) multifilament, and nylon multifilament, nylon monofilament, PE twisted monofilament and PE yarn undertaken in Hirakud reservoir are discussed. Based on the comparative fishing data recorded, the polypropylene is adjudged as the best substitute for nylon.
  • Item
    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.
  • Item
    Dual preservative treatment for small fishing vessels - Observations on the biodeterioration of mango wood
    (Society of Fisheries Technologists (India), Cochin, 1993) Edwin, L.; Thomas, S.N.; Nair, N.U.; Ravindran, K.
    This communication deals with the effect of dual preservative treatment techniques using a water borne preservative (Copper- chrome-arsenic) followed by an oil borne preservative (creosote) on Mangifera indica, commonly used in the construction of traditional fishing craft. Qualitative and quantitative analyses of dual preservative treated timber showed better retention of residual strength after exposure to marine conditions, compared to timber treated with copper-chrome-arsenic composition and creosote separately.
  • Item
    Advantages of square mesh codend on the conservation of demersal fisheries in EEZ
    (Department of Ocean Development , New Delhi, 1996) Pillai, S.N.; Varghese, M.D.; Abbas, S.M.; Iyer, H.K.
    Square mesh in the codend play an important role on the selectivity of trawl gear and the conservation of resources. Comparative fishing trials between the square mesh and diamond mesh codends were carried out in deeper waters from FORV Sagar Sampada. The length frequency measurements of the important species of fish caught in both the codends showed the supremacy of square mesh by retaining more bigger fish and eliminating under sized and juvenile fishes, than the diamond mesh.
  • Item
    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.
  • Item
    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.