FT Vol.42(1)
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- ItemEffect of Body Weight on Reproduction and Mobilization of Organic Reserves in Female Sailfin Molly Mollienesia latipinna (Le Sueur)(Society of Fisheries Technologists (India)Cochin, 2005)Reproduction and mobilization of nutrients and energy for reproduction were studied in female Mollienesia latipinna as a function of body weight. Total reproduction (TR), reproductive effort (RE) and somatic condition factor (SCF) increased with increase in body weight. Gonad was not developed in the smallest female tested (0.313 g) and gonad weight was highest before parturition (breeding) and it significantly declined after varied parturition. The proximate composition and energy in somatic and gonad tissues varied with increase in body weight of female M. latipinna and if suggests the deposition of nutrients with the advent of the reproductive period. Low level of lipid in soma and high level of lipid in female gonads indicate the mobilization of lipid from soma to gonad to provide nutrients for the development of eggs and fry. Nutrients and energy were more in soma and gonad before parturition and they significantly reduced after parturition. M. latipinna being an ovoviviparous fish, utilized significant amount of nutrients and energy for the development of ova, egg and fry which led to the reduction of energy contents after parturition
- ItemTechnological Properties and Biochemical Studies of Bonga Ethmalosa fimhriata(Society of Fisheries Technologists (India)Cochin, 2005)Size measurements, anatomical composition and biochemical evaluations of bonga (Ethynalosa fimhriata) muscle were carried out. The mean values of length and weight recorded for bonga over a period of 2 months were 22.12+1.27 cm and 136.82±13.27 g respectively. Size measurements as shown by length and weight data for the one-year period suggested a positive effect of season on size. The pattern of change in weight throughout the study period was similar to that of change in length and gave a correlation coefficient " r " of 0.82 significant at p<0.05. Anatomical fractionation showed that bonga contained on the average 61.1% trunk, 23.7% head and 16.3% viscera. Total wastes (head and viscera) derived from bonga were 39.9% of the total body weight. The proximate chemical composition analysis showed that the muscle of bonga contained between 74.14% and 77.54% moisture, 1.12-5.69% lipid, 18.73- 21.54% protein and 1.57- 2.14% ash. The chemical composition did not vary significantly except in lipid content where a significant (p<0.05) inverse relationship between moisture and lipid content was observed. Triglycerides accounted for over 5% of lipid in bonga. The major fatty acid component in the lipid of bonga were C 16:0, C 18:0, C 18:1, C 20:4, C 20:5and C 22:6.
- ItemField Study on Corals and Coral Living Organisms in Van Tivu, in the Gulf of Mannar(Society of Fisheries Technologists (India)Cochin, 2005)The results of the study on corals in the Van Tivu island in the Gulf of Mannar, are presented. Eighteen species of stony corals were recorded in our study area. Favia, Porites, Acropora, Tubipoira, and Montipora spp., were found to contribute about 80% of the total coral population in Van tivu. The northeast and southwest transects were found to have higher percentage of corals. The molluscs alone contributed about 30% of the total reef fauna. The northeast transect had a good numerical data of molluscs. The vulnerable molluscan species from this area was found to be Sqm spp. Different types of coral reef fishes were present in the Van tivu. The notable ones are Butterfly fishes (Chaetodontidae), Parrot fishes (Scaridae), Clown and Damsel fishes (Pomacentridae) and Lion and Scorpion fishes (Scorpaenidae). Coral reef destruction was found to be caused by bio-eroding organisms. The common bio-eroders observed during our field study were lion fish, butterflies, wrasses, Echinometra mathei (Echinoderm) and Lambis spp. (Gastropods) and Tridacm spp. (Bivalves).
- ItemEffects of Different Oil Cakes on the Growth and Survival of Liza parsia (Hamilton-Buchanan, 1822)(Society of Fisheries Technologists (India)Cochin, 2005)Fry of mullet Liza parsia were fed with whole poultry egg based flakes diet supplemented with various oil cakes viz. Mustard Oil Cake, Groundnut Oil Cake and Soya Cake. The experiment was conducted with five replicates for 90 d. The maximum length gain, weight gain, specific growth rate and survival recorded was 429.20%, 2140.38%, 3.45% and 86.00% respectively in diet with mustard oil cake. Based on these results. Mustard Oil Cake can be used in feed for better growth and survival for fry of L. parsia
- ItemEffect of Isocaloric Diets with Varying Protein Level on Growth and Survival of Post-larvae of Macrobrachiutn rosenbergii(Society of Fisheries Technologists (India)Cochin, 2005)Post-larvae of Macrobrachiutn rosenbergii (de man) were fed on an isocaloric diet (3100 K.cal DE/Kg) having different levels of protein (27.56, 34.12 and 41.12%) with protein: energy ratio of 88.16, 109.18 and 130.58 mg CP/K. cal respectively. The animals were reared for a period of six weeks under a temperature regime of 13-220C. The highest weight gain, specific growth rate and the best feed conversion ratio recorded were 165.61 mg, 3.35 and 1.69 respectively. The survival rates in ranged between 77.8 and 84%.