FT Vol.47(2)

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    Probiotic Effects of Bacillus spp. on the Growth and Survival of Postlarvae of Macrobrachium rosenbergii
    (Society of Fisheries Technologists (India)Cochin, 2010) . Rinisha, K.; Rahiman, K. M. Mujeeb; Beevi, M. Razia; Thomas, A. P.; Hatha, A. A. Mohamed
    Negative impact due to continued usage of antibiotics in aquaculture for growth promotion and disease control has necessitated research on alternative strategies such as development of probiotic strains, immunostimulants and vaccination. In this study, the probiotic effect of a Bacillus spp. on the growth and survival of postlarvae (PL) of Macrobrachium rosenbergii was studied. The Bacillus spp. under investigation was introduced in to the PL through culture tank water, feed and both. Changes in the bacterial load and flora, weight gain, percentage survival and changes in water quality parameters such as pH, dissolved oxygen, nitrite and ammonia were studied for a period of three months. There was no significant variation in the survival and weight gain of the PL of the experimental groups. However considerable improvement was noticed in the water quality parameters such as nitrite and ammonia concentration of the culture water in the experimental groups compared to the control group
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    Crab Fattening: A Livelihood Option for the Coastal Women Self Help Groups
    (Society of Fisheries Technologists (India)Cochin, 2010) Shanthi, B.; Ambasankar, K.; . Krishnan, M.; Balasubramaniam, C.P.; Kannappan, S.; Chandrasekaran, V.S.; Jayamalar, K. Merline; Gayathri, G.
    Aquaculture offers one of the best livelihood options for women especially in coastal areas. Crab fattening has emerged as a brackish water aquaculture alternative which has potential for a possible livelihood for the coastal women, due to the relative ease of culture techniques and reasonably good profit margin. A project sponsored by Dept. of Science and Technology was undertaken by Central Institute of Brackishwater Aquaculture (CIBA), Chennai at selected coastal villages of Tiruvalluvar and Kancheepuram districts of Tamil Nadu to demonstrate the efficiency of ‘CIBA crab pellet feed’ and the viability of crab fattening as an alternative livelihood for coastal fisherfolk. Two floating cages of 1m x 1m x 30 cm with 6 compartments each were used at the above project sites for crab fattening demonstration. Each cage was stocked with six water crabs. The crabs were fed with trash fish and ‘CIBA crab pellet feed’. The pelleted feed was accepted very well by the crabs. There was an increase in the weight of the crabs by 9 to 10%. The community-based crab fattening project implemented for alternative livelihood purpose especially for coastal women Self Help Groups, has proved to be a great success not only in terms of generating extra income but also in creating an awareness among fisher folk about the value of brackishwater resources and the need for conservation and its sustainable utilization.
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    Incidence of Food-borne Pathogens in Freshwater Fish from Domestic Markets of Mumbai
    (Society of Fisheries Technologists (India)Cochin, 2010) Kakatkar, A. S.; Gautam, R. K.; Nagar, V.; Karani, M.; Bandekar, J. R.
    The present study indicates that the freshwater fish sold in Mumbai are of poor quality. Presence of coagulase positive S. aureus indicates unhygienic handlingRecovery of Salmonella and high coliform count warrant for strict adherence to Good Hygienic Practices in retail markets
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    Effects of Feed Additive Raafres AQ on Feeding, Growth, Tissue Indices and Leucocytes Count in Carp Juveniles
    (Society of Fisheries Technologists (India)Cochin, 2010) James, R.; Sampath, K.
    The present study concludes that, raafres AQ at 5% in C. mrigala and 7.5% in L. rohita elicited better performance in feed intake, growth, FCR, PER, tissue indices and leucocyte counts than other treatments. Hence, 5 and 7.5% raafres AQ are considered as the optimum dose for C. mrigala and Lrohita respectively. Comparatively, the optimum dose of raafres AQ in L. rohita influenced percentage of weight gain, conversion efficiency and PER with less feed intake, feeding rate and FCR than the optimum dose of raafres AQ in C. mrigala. Besides, 5% raafres AQ incorporated diet resulted in similar impact on percentage of weight gain, conversion efficiency, FCR and PER in both carps and hence, the requirement of high dose in L. rohita might be nullified. Hence it is recommended to utilize raafres AQ in feed for better aquaculture production
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    Redescription of Smooth Lantern Shark, Etmopterus pusillus (Lowe, 1839) from the EEZ of India
    (Society of Fisheries Technologists (India)Cochin, 2010) Deepu, A.V.; Joseph, Ginson; Kurup, B. Madhusoodana
    This paper presents more differentiating characters (Table 1) such as difference in the positioning of first and second dorsal fin, size of dorsal fin spines, shape of the gill slits and position of eye in relation to snout. Even though each morphometric measurement contributed relatively little for the overall differences, when all these small differences were considered together, it is possible to separate the species. The main difference mentioned by earlier authors (Compagno, 1984; Compagno et al., 2005) was in the shape of dermal denticles. But the characters presented in this study are useful for the field identification of E. pusillus.
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    Changes in the Nitrogenous Compounds during Fermentation of Hilsa Steaks
    (Society of Fisheries Technologists (India)Cochin, 2010) Majumdar, Ranendra Kumar; Basu, S.
    Lona ilish, a traditional salt fermented fish product, made exclusively from hilsa (Tenualosa ilisha), is widely consumed in Bangladesh and adjoining Northeastern parts of India. No detailed scientific studies have been made on lona ilish. To understand the science behind this traditional preservation process, the product was prepared in the laboratory following traditional method, and biochemical changes during fermentation period of 150 days, were studied. At fortnightly intervals, important parameters such as the protein and protein degradation as well as lipid and its degradation in the product were studied. Increase in non-protein nitrogen (NPN), free alpha amino nitrogen (FAN) and total volatile basic nitrogen (TVBN) contents during fermentation indicated hydrolysis of protein. However, the decrease in protein nitrogen content was not significant. A value of NPN/TN of 18% in the fish muscle was found indicative of the fermentation point. High salt content (15.48%), intermediate moisture content (49.89%) and low pH (5.28) of the final product were found to be satisfactory for stability of the lona ilish at ambient temperature
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    Toxic Effects of Sodium Dodecyl Sulphate on Grass Carp Ctenopharyngodon idella
    (Society of Fisheries Technologists (India)Cochin, 2010) Susmi, T. S.; Rebello, Sharrel; . Jisha, M. S.; Sherief, P. M.
    Sodium dodecyl sulphate, an anionic detergent finds various applications in household, industrial, laboratory and pharmaceutical preparations.This paper reports the histological, enzymatic and microbial changes found in the gills of Grass Carp (Ctenopharyngodon idella) induced by the acute action of Sodium dodecyl sulfate (SDS). A 96 h LC50 value of 7.7 mg/ l of SDS was obtained using static bioassay method. Sets of twenty grass carps each were exposed to nominal concentrations (2, 2.5 and 3 mg/l) of SDS for 30 days and the changes in the gills were monitored every tenth day. Extensive gill damage with necrosis and intraepithelial oedema was observed. This was accompanied by increased levels of antioxidant enzymes viz., superoxide dismutase and catalase. The gills of SDS treated fishes also showed an increased rate of microbial attack predominantly by Aeromonas sp, Micrococcus sp and Bacillus sp. Extensive necrosis, and increased rate of microbial attack suggested that SDS incites an acute inflammatory response. The morpho-histochemical changes in the gills provoked functional disorders viz., asphyxia and loss of osmotic and ionic regulation that may ultimately play a significant role in the mortality of Grass Carp exposed to SDS.
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    Mesh Selectivity of Drift Gillnet for Caranx sexfasciatus and Caranx tille
    (Society of Fisheries Technologists (India)Cochin, 2010) Balasubramanian, A.; Meenakumari, B.; Boopendranath, M. R.; Pravin, P.; . Erzini, K.
    The gear selectivity and fishing power of different mesh sizes (13.5, 14, 14.5 and 15 cm) were investigated using experimental catch data of carangids Caranx sexfasciatus and Caranx tille. The selectivity and residual curves were generated using four different individual uni-normal (normal scale, normal location, gamma and log-normal) and bi-normal functions with four different mesh sizes. Selectivity parameters were estimated using the SELECT (Share Each LEngth Class Total) model which has been implemented in the software called GILLNET (Generalized Including Log-Linear N Estimation Technique). Model deviance, Dispersion parameter and Residual plots were used to determine the best fit of the data. The results demonstrated that bi-normal model and uni-normal log-normal yielded good fit for C. Sexfasciatus and C. tille respectively. Mesh sizes 14 and 14.5 cm performed better than the modeled in both the catch data. Modal length increased with mesh sizes. Bi-normal model yielded narrow selection range while log-normal model was of wider range. Shape and size of the selectivity curves were identical and uniform in size. Over dispersion was common in all selectivity models which in turn showed lack of fit irrespective of the models