• A bacteriological study of the natural flora of edible oyster, Crassostrea madrasensis

      Durairaj, S.; Chinnasamy, G.; Mohamed, M.S. (1983)
      The total viable bacterial populations in the oysters and the sea water from the edible oyster farm at Tuticorin were in the range of 10 super(3) to 10 super(4) per ml and 1 super(2) to 10 super(3) per ml respectively. The maximum most probable number of faecal coliform recorded during the one year period of study of both the oysters and seawater were 33 per 100 ml. Pathogenic bacteria (Salmonella sp., Vibrio cholerae, coagulase positive staphylococci and faecal streptococci were absent in oysters and farm water. Study of 197 (98 taken from oyster liquid and 99 from oyster farm water) randomly isolated cultures indicated that gram negative asporogenus rod-like bacteria of the Vibrio, Flavobacterium, Achromobacter and Pseudomonas groups were the dominant flora of the oyster liquid as well as seawater.
    • A biochemical test for the distinction of fresh fish from frozen and thawed fish

      Chhatbar, S.K.; Velankar, N.K. (1977)
      It is observed that the freezing and thawing of fish leads to increase in the total activity of aspartate aminotransferase (AAT) in tissue fluid due to the release of the bound form of mitochondrial enzyme. Electrophoresis of the tissue fluid of fresh unfrozen fish shows only a single fast-moving band of AAT in the anodic region whereas frozen and thawed fish shows an additional slow-moving band corresponding to mitochondrial AAT in the cathodic region. The method can be adopted to distinguish fresh fish from frozen and thawed fish.
    • A brief account on the 'Gunja Net' fishing of the Kutch Backwaters (Gujarat)

      Subramonia Pillai, N.; Gopalakrishnan, K. (1984)
      A survey was made of the fishing gear (Gunja net) and methods used in the prawn fishery of the coastal waters of the Gulf of Kutch.
    • A case history on the phenomenal corrosion of marine propellers in fishing boats

      Balasubramanyan, R. (1973)
      Although high tensile brassess of copper-zinc alloys (Manganese bronze) find extensive use in all marine applications, under aggressive sea-water, marine propellers cast out of such an alloy frequently suffer heavy corrosion damages due to dezincification. An interesting case history where a number of propellers have undergone dezincification in the Cochin backwaters is narrated in this paper.
    • A demersal trawling gear for inshore waters along the west coast

      Mhalathkar, H.N.; Mathai, T.J.; George, T.P.; Syed Abbas, M. (1985)
      Results of comprehensive efficiency tests of three tested designs of 15m bulged belly, 15.8m six seam and 29.26m longwing type trawls in combination with 114x57cm 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.
    • A mechanical device for eradication of submerged aquatic weeds

      Velu, M. (1969)
      This paper embodies details and method of operation of a mechanical device developed for eradication of submerged aquatic weeds. The economics of operation is also discussed.
    • A method for pisciculture in Idukki Reservoir

      Khatri, T.C. (1985)
      An account is given of the possibility of fish culture in Idukki Reservoir using the "pocket culture" method.
    • A method for the preparation of cooked-peeled-frozen prawns

      Mathen, C.; Mathew, A.; Varma, P.R.G.; Thomas, F. (1979)
      Several consignments of cooked-peeled-frozen prawns exported from India were rejected last year due to high total plate count (TPC) at 30°C. The specified temperature of incubation for TPC in our country is 37°C. Hence the effect of incubation at 30 and 37°C on TPC was studied. It is seen that the count is higher on incubation at 30°C. A method for production of cooked-peeled-frozen prawns conforming to the specification for TPC at 30°C is standardized and is reported. It consists of recooking the cooked-peeled prawns followed by packing and freezing without further contamination. The method minimizes batch to batch or sample to sample variation in TPC.
    • A method of immersion of panels for ecological studies on marine fouling and boring organisms

      Srinivasan, V.V.; Mohan, K.C. (1973)
      The importance of studies on the biology of marine foulers and borers needs no emphasis since they cause damage to submerged wooden structures resulting in considerable economic loss. In order to study their occurrence, settlement and to assess the rate of destruction to timber, several immersion techniques using iron racks, cages and rafts have been adopted. On the east and west coasts of India, at the Marine Centres of Forest Research Institute (Waltair, Madras, Cohin and Bombay) investigations have so far been carried out employing the first two methods.
    • A method to preserve fish muscle pieces and mince from sciaenids

      Chakrabarti, R. (1988)
      Fish muscle pieces and mince from sciaenids can be preserved for 72 and 48 h respectively at ambient temperature (34°C ± 4.5) in media containing 8% NaCl, 0.2% sodium benzoate and 0.5% potassium sorbate. Incorporation of 0.1% sodium bisulphite in this media slightly improved the texture and flavour of minced fish.
    • A new high opening trawl for Veraval waters

      Kunjipalu, K.K.; Boopendranath, M.R.; Gopalakrishnan, K.; Kuttappan, A.C. (1984)
      The newly developed 25m high opening trawl possesses the properties of a high rising bottom trawl and a semi-pelagic trawl. The new gear is effective for the capture of demersal and semi-pelagic fishes. The net offered more horizontal opening and less resistance with significantly high catch of ribbon fish when compared with bulged belly trawl.
    • A new large mesh trawl for dermersal fishery

      Kunjipalu, K.K.; Kuttappan, A.C.; Mathai, P.G. (1979)
      A new large mesh demersal trawl of 32 m head rope length is found more efficient for the exploitation of demersal fishes off Veraval. Increased catch with a proportionate increase of demersal fishes was obtained when compared to a standard bottom trawl of 32 m head rope length with small meshes, suggesting the possibility of increasing the mesh size of trawl nets in the forepart. This increases the mouth area of net which enhances the fishing power by covering a large area per tow. The net is simple in construction, easy to repair and maintain and fewer in the number of meshes.
    • A new observation on large scale disintegration of eggs of Indian major carps during development

      Biswas, K.P.; Saha, G.N. (1972)
      While carp themselves may destroy carp eggs by sucking from outside the happa, destruction in the absence of carp also occurs. During observations of the effect of electrical field on developing carp eggs it was seen that the egg membrane ruptured prematurely under certain potential differences. In natural waters and mud potential differences occur in the presence of high concentrations of certain salts compared with the internal concentration. Temperature and pH fluctuations following strong sun or heavy rain accelerates the diffusion of ions along side water through the egg membrane. The egg cells expand rapidly and the embryos were rapidly dropped.
    • A new one-boat mid-water trawl for Indian waters

      Mhalathkar, H.N.; Ramarao, S.V.S.; Mathai, P.G. (1975)
      Even though the rich and variegated pelagic fishery resources of our west coast are well known much has to be done for a judicial and systematic exploitation on a commercial scale. To fill up this lacuna the present paper describes in detail a new design of 10.5 m four-equal panel mid-water trawl, its rigging and operation from a medium size vessel. Comprehensive comparative efficiency studies of this gear with a 10.5m unequal panel mid-water trawl established the superiority of the new gear. From the results based on the mouth opening, resistance and the catch it is opined that this new gear can not only be used on a commercial scale in harvesting the seasonal pelagic fishery, but also as a secondary supporting gear in shrimp fishery in places like Veraval, where there is a commercially exploitable yield of quality fishes like hilsa, pomfret, seer etc., without much modification from conventional stern trawlers.
    • A new procedure for canning of squids

      Raghunath, M.R.; Solanki, K.K. (1986)
      A new canning procedure for squid mantles aimed at increasing the fill and retaining the sweet flavour of squids was evolved. In the new method, after blanching smaller mantles are inserted inside bigger ones to reduce voids and thus increase the fill to 56% and above as compared to 46% when packed as rings. In addition, spent blanching medium containing desirable flavour constituents of squid was modified and used as covering medium which increased the flavour of canned product.
    • A new technique to control insect infestation in Mas min

      Valsan, A.P. (1968)
      A process of heat treating Mas min at 125°C for 15 minutes and hermetically packing them up has been investigated. Thismethod has been found to be successful in controlling insect infestation in Mas min. The Japanese method of packing Mas min in BHC coated containers has also been simultaneously examined and found successful under certain conditions. However, this process is found to impart slight undesirable flavors to the product. In addition, this chemical treatment is also likely to be more costly.
    • A note on proximate composition of tuna fish paste from Minicoy

      Valsan, A.P.; Kandoran, M.K.; Suryanarayana Rao, S.V. (1964)
      An indigenous method of preparing fish paste from Tuna, exclusively practiced in Minicoy islands is described. Detailed proximate analysis data of the product is presented and it has been compared with the values obtained for similar products of foreign countries. A chromatographic study is also carried out for essential amino acids and also with special reference to detecting any possibilities of histamine poisoning, especially in view of the reported high values of histidine in tuna meat. However, free histamine is not detected in the sample.
    • A note on the comparative catch efficiency of nylon over cotton gill nets in reservoir fishing

      Mathai, T.J.; George, N.A. (1972)
      The authors conducted a series of experiments to evaluate the relative efficiency of nylon over cotton in tropical waters, particularly in reservoir fishing. The experiments were conducted in the Gobindsagar reservoir (Himachal Pradesh/Punjab). The nets made with both materials were identical in essential details like twine size, mesh size, number of floats arid sinkers and hanging coefficients.
    • A note on the production trend of marine shrimps in India

      Banerji, S.K. (1965)
      The paper reviews the production statistics of marine shrimps in the different maritime states of India from 1950 to 1962. It is pointed out that for a correct appraisal of the status of any fishery, it is necessary to have data on effort E and catch per unit effort in addition to the conventional data on catch C. A relationship between U and E has been developed and the status of the fishery of Metapenaeus dobsoni has been discussed in this connection with reference to the data on catch and effort obtained from trawler operations off Cochin.