FT Vol.38(2)
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- ItemTraining Needs of Shrimp Farmers - An Assessment(Society of Fisheries Technologists (India)Cochin, 2001)Thirty shrimp farmers were interviewed in Nagapattinam coastal district of Tamil Nadu, India to assess their training needs. Personal profile of the farmers was found to be of high level and their relationship with training needs was not significant. The farmers desired to acquire necessary knowledge and skills to deal effectively with disease menace, seed quality, pond management and recent developments in aquaculture for sustainable shrimp production. Transfer of technology and human resource development programmes of the research organization and extension activities of the State fisheries departments may be intensified incorporating these training needs
- ItemSeasonal Variation in Growth and Survival of Penaeus monodon Larvae Under Hatchery Conditions(Society of Fisheries Technologists (India)Cochin, 2001)The present paper deals with various aquatic abiotic parameters which influence the spawning, hatching and larval metamorphosis of Penaeus monodon in controlled conditions. Water temperature, salinity and dissolved oxygen as well as general hygienic conditions were found to be the critical factors for the successful gonadal hydration, breeding and survival of young ones of Penaeus spp. Optimum ranges of hydrographic parameters were temperature 28-30oC, salinity 28-33 ppt and dissolved oxygen close to saturation. The larvae were fed on diatoms (Chaetocews sp.), Artemia cysts and egg custard. The algal culture was maintained in the hatchery itself under conducive conditions. The hygienic conditions of the hatchery were maintained by using chemicals such as chlorine, EDTA and formalin. Antibiotics like oxytetracycline and chloramphenicol were used as prophylactic measures in order to prevent outbreak of diseases and infections. The present experiments conducted in Maharashtra revealed that best results in spawning, larval survival and growth could be obtained during September-October months, when temperature and salinity were in favourable ranges.
- ItemRelative Fuel Consumption and Effective Fishing Time of Small-scale Mechanised Gillnetters, off Cochin(Society of Fisheries Technologists (India)Cochin, 2001)The drift gillnet operation is one of the important low energy fishing methods in small scale fishing sector along the Indian coast. The gillnet operations have undergone considerable change in the form of increased length class and horse power of fishing crafts employed, which enable the vessels to operate at distant fishing grounds and with enhanced operational efficiency. An understanding of effective fishing time and fuel efficiency will lead to considerable improvement in operational efficiency of gillnetters. The analysis of the effective fishing time and relative fuel consumption among the selected length classes of gillnetters operating from Cochin Fisheries Harbour showed that effective fishing time increased with increase in length overall and the relative fuel savings was higher in length 31-35' class vessels.
- ItemOptimization of Mesh Size of Gill Nets for Sardinella gibbosa (Bleeker)(Society of Fisheries Technologists (India)Cochin, 2001)Fishing conducted in inshore waters off Thoothukkudi (Tamil Nadu) during 1997-98 using 16 units of nylon gill nets with 26, 28, 30 and 32 mm mesh size made up of 210D/ 1/2 twine revealed that the proportionality co-efficient (k) of the gill net selectivity equation for Sardinella gibbosa was 0.104. Gill net with mesh size 29.6 mm was found to be ideal for the commercial exploitation of S. gibbosa which contributes considerably to the lesser sardine fishery of Thoothukkudi coast. The details of enmeshing pattern of different length groups of S. gibbosa in gill nets of different mesh sizes are presented
- ItemOptimization of Energy to Protein Ratio in Feed for Labeo rohita Fingerlings(Society of Fisheries Technologists (India)Cochin, 2001)Ten semi-purified diets with two levels of dietary protein (32 and 41%) having five energy levels each (324, 341, 364, 384 and 407 kcal.lOOg1) were formulated and fed to Labeo rohita fingerlings for a period of 45 days. Factorial analysis of variance indicated that although weight gain, food conversion efficiency and protein utilization were significantly affected by dietary energy and protein levels, the energy and protein conversion efficiencies were not influenced by dietary energy and protein interaction. The best growth and food conversion ratio (FCR) were obtained with an average of 379.72 kcal.lOOg1 at 41% protein diet (P/E 107.87 and E/P 9.29), while maximum protein utilization and conversion occurred with similar energy levels (383 kcal.lOOg"1) but in low protein (32%) diet. Although dietary energy influenced the body constituents of fish, the influence of protein was not significant. The results indicated that with increased allowance of energy, more protein was utilized for tissue building and enhancement of growth.