FT Vol.40(2)
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- ItemPerformance of Inboard Diesel Engine Fitted Canoes Operating Ring Seine along Kerala Coast(Society of Fisheries Technologists (India)Cochin, 2003)The performance of the recently introduced Inboard Engine(IBE) fitted crafts operating ring seine is reported. 153 units were enumerated from 8 districts of Kerala. The total landing from IBE canoes was found to be 11745 tonnes, with an average catch per unit effort of 1826 kg and average catch per hour 555 kg. The operation cost and revenue generated from ring seine operated by Out Board Motor canoes and IBE canoes are compared.
- ItemGrowth, Survival Rate and Feed Conversion Ratio of Juveniles of Macrobrachium rosenbergii (de Man) Fed with Farm made and Commercial Feeds(Society of Fisheries Technologists (India)Cochin, 2003)Feeding trial was conducted in M. rosenbergii to compare efficiency of the farm made feed (diet FMF) with commercial feeds like CP feed (diet A), Higashi feed (diet B), and Rosen feed (diet C). Dried clam meat was used as the control feed (diet D). Water stability of FMF is found well comparable with the above feeds. Higher specific growth rate was recorded in diet FMF (2.02) that did not vary significantly (p>0.05) among the dietary treatments except in diet D (1.15). Higher survival was recorded in diet FMF (91.07%) followed by diet A (90.48%), diet B (89.68%) and diet C (82.14%) while the survival of the juvenile of M. rosenbergii fed with control diet (37.5%) was significantly (p<0.05) lower compared to other treatments. Feed conversion ratio recorded for diet FMF was comparable with that of diets A and B. Protein efficiency ratio was significantly higher (p<0.05) in diet B (0.86), A (0.78) and FMF (0.77) when compared to diet D (0.31). Cost of diet A and B (200%), C (185%) and control diet (169%) was significantly higher than diet FMF. Results of the present study revealed that the growth, survival and feed conversion ratio of M. rosenbergii fed with farm made feed prepared from the locally available feed ingredients were comparable with those of commercial scampi feeds. As the farm made feed preparation was found very cost effective it can be recommended to the scampi farmers of Kerala to make farming more economically viable and feasible
- ItemEvaluation of a Few Locally Available Anaesthetics for Potential Use in Fish Seed Transportation(Society of Fisheries Technologists (India)Cochin, 2003)study was conducted to explore the possibility of using a few locally available anaesthetics, thiopentone sodium, xylodac, lignocaine and sodium chloride for fish seed transportation. Application was made by inhalation of anaesthesia where by the drugs, in aqueous solution, entered the arterial blood during ventilation of the gills. The study revealed that the mixed seeds of major carp (Labeo rohita, Cirrihinus mrigala and Catla catla) of average length 2.8 cm could be transported safely in a solution containing thiopentone sodium @15 mg/L of water for more than 30 min without oxygen. In the case of lignocaine, lOml/L gave the best result with a recovery time of 14 min; whereas, 4ml/L of xylodac was found to be effective for fish fry with a mean survivability of 90%. The anaesthetics were found to reduce the activity of the fish fry in the aqueous solutions of the sedative agents. The study indicates the possibility of utilizing these compounds for short duration fish seed transportation
- ItemEffect of Salinity on Growth and Survival of Rohu, Labeo rohita (Ham.) under Laboratory and Field Conditions(Society of Fisheries Technologists (India)Cochin, 2003)The limits of salinity affecting survival and growth performance of the Indian Major Carp, Labeo rohita was studied in laboratory and field conditions. A salinity range of 0 tol4 ppt was used at 2 ppt interval in the present study. Rohu could survive in waters upto 8 ppt salinity. Beyond 8 ppt, the fish showed signs of stress and mortality occurred. There was 100% mortality in 14 ppt salinity within 7-8 days. Although maximum growth was obtained at 0 and 2 ppt, growth was not markedly affected upto 6 ppt salinity. Rohu was cultured along with milkfish in brackish water pond, where salinity ranged from 1.9-8.9 ppt during the culture period of 120 days. As salinity increased above 8 ppt, Rohu showed stress signs and therefore, the culture was discontinued. The present study indicates that there is good potential for culturing these species in low saline areas, that otherwise remain unutilized
- ItemEffect of Mercuric Nitrate on the Chromosomes of Channa punctatus (Bloch, 1793)(Society of Fisheries Technologists (India)Cochin, 2003)The effect of different doses (0.019, 0.038 and 0.075 ppm) of mercuric nitrate on the chromosomes of Channa punctatus was studied. The karyotype was done by standard colchicine, potassium chloride, acetomethanol and air-drying geimsa staining technique. It was observed that the percentage of Total Metaphase spreads with Chromosomal Aberrations (T.M.C.A.) increased with the increasing concentration levels. Mercuric nitrate induced structural chromosomal aberrations included breaks, fragments, dicentric and ring type chromosomes. The study revealed that 120 h of exposure in mercuric nitrate at concentration levels as low as 0.019 ppm induced chromosomal aberrations in fish.