FT Vol.36(2)

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    Changes in K Value and Biogenic Amines During Storage of Atlantic Mackerel (Scombes scomberus) in Ice
    (Society of Fisheries Technologists (India)Cochin, 1999) Mathew, P.T; Ryder, John M.; Gopakumar, K
    Determination of K value in conjunction with sensory evaluation serves as a good index of the freshness of fish. In this study, the above parameters were used to determine the freshness of Atlantic mackerel (Scombes scomberus) during storage in ice. K value showed a steady increase from 23 to 78 during ten days of storage in ice. No biogenic amines such as putrescine, cadaverine, tyramine, spermine and spermidine were detected in the fish during this period
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    Cryopreservation of Brown Trout (Saltno trutta fario) Sperm: The Influence of Extender Composition and Fertilization Procedure
    (Society of Fisheries Technologists (India)Cochin, 1999) Gopalakrishnan, A; Thakur, K.L; Ponniah, A.G; Kumar, K; Dayal, R
    Seven extenders were tested to check their relative efficiency in cryopreserving the milt of brown trout (Saltno trutta fario). Hatching rates equal to that of control (p > 0.05) were obtained when a cryodiluent containing egg yolk (2%) and dimethylsulphoxide (10%) was used. Removal of coelomic fluid prior to the addition of thawed milt and addition of 5 mM theophylline to the "Dexter" solution enhanced the hatching percentage. The sperm density varied from 9.83 to 18.41 x 109 sperms/ml.
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    Cytokinins from Marine Green Alga, Caulerpa raceniosa (Kuetz) Taylor
    (Society of Fisheries Technologists (India)Cochin, 1999) Kaladharan, P; Sridhar, N
    Cytokinin - like substances were extracted from green seaweed, Caukrpa racemosa and purified using an ion exchange column of CM-cellulose. Bioassay of these extracts with darkgerminated cotyledons of cucumber for chlorophyll biosynthesis proved the presence of cytokinin - like substances in the extract of C. racemosa. The efficiency of the extract was comparable to that of commercially available kinetin. The study is indicative of strong possibilities of producing cytokinin from unutilized and commonly occurring C. racemosa on a commercial scale and at low cost.
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    Growth, Survival and Body Composition of Tilapia, Oreochromis mossambicus Fed Graded Levels of Stress Care
    (Society of Fisheries Technologists (India)Cochin, 1999) Murthy, H. Shivananda; Naik, A.T. Ramachandra; Ramesha, TJ
    The effect of feeding graded levels of stress care, a stress releasing agent for farm animals and poultry, on the growth, survival and carcass composition of tilapia, Oreochromis mossambicus was studied. Stress care, at different levels, was added to a fish meal based diet. The experiment was conducted in indoor closed recirculatory system for two months. Results showed that higher survival of tilapia was obtained with a diet containing 0.75% stress care but growth rate was not influenced by the presence of stress care
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    Heat-stable Alkaline Proteinase from Shrimp Waste
    (Society of Fisheries Technologists (India)Cochin, 1999) Chander, Ramesh; Thomas, Paul
    Proteolytic activity of shrimp waste at alkaline pH was examined. Shrimp waste was found to be a good source for this enzyme. The enzyme activity in the shrimp waste was about 50 times higher than that of muscle. The pH optimum of the enzyme was 8.5 and temperature optima, 50-55oC. It was inhibited maximally by serine protease inhibitor such as STI (soybean trypsin inhibitor). An interesting feature of the enzyme was its tolerance to different solvents.
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    Nursery Rearing of Catla (Catla catla) Under Different Dietary Protein and Fertilization Levels
    (Society of Fisheries Technologists (India)Cochin, 1999) Manissery, J.K; Krishnamurthy, D; Gangadhar, B; Nandeesha, M.C
    Catla (Catla catla) spawn were stocked at 5 million/ha in a commercial fish seed farm. Cow dung at the rate of 13,000 (Tl), 15,000 (T2) and 18,500 kg/ha (T3) were applied in split doses during the experimental period of 21 days. Finely powdered groundnut cake-rice bran mixture (1:1) served as control diet (A). Experimental diets were formulated by incorporating fish meal at 10 (B), 24 (C) and 38% (D) level in the control diet. All the diets were tested at each level of fertilization and fed at equivalent, 3 times and 4 times the initial body weight for the first 5, next 10 and rest of the days respectively. Irrespective of the diet given, increased growth and survival of catla and increased weight of plankton were recorded with increase in fertilization rate. The highest average length and weight gain were observed in fish fed diet C with 35% protein. The overall survival was the highest in T3 and lowest in tl. Fish meal based diet with 35% protein was found to be ideal for the nursery rearing of catla in fertilized ponds to obtain higher growth and survival