FT Vol.54(1)
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- ItemIdentification of Key Factors to Negotiate Spontaneous Spawning of Clarias batrachus in Confinement(Fishery Technology, 2017)Clarias batrachus do not spawn spontaneously in confined conditions even after induction using synthetic hormones. Current hatchery techniques for seed production of the species involves fertilization of stripped eggs using ground testes suspension from a sacrificed male. The study report the elicitation of spontaneous spawning in C. batrachus and the successful hatching of the eggs collected there from. The mature males and females were induced using ovatideTM and released into a gently sloping drain planted with paddy saplings. The fertilized eggs were collected 24 h post injection and transferred to a flow-through device for incubation. It is observed that bilateral injection of ovatide in combination with complete exclusion of light and total simulation of the natural breeding grounds of the species have positive influence on spontaneous spawning in confinement. With finer refinements, it would be possible to have more control and success in terms of spontaneous spawning and easy collection of the eggs, which is desirable for a commercial hatchery.
- ItemTemporal Variability of Size-fractionated Chlorophyll a Concentration and Influence of Chemical Parameters in Coastal waters of South-eastern Arabian Sea(Fishery Technology, 2016)Phytoplankton size structure influences the underwater light field and determines the fate of carbon in a pelagic food chain. Temporal and vertical variations of size fractionated chlorophyll a concentration (Chl-a) were investigated along coastal region off Kochi from May 2013 to April 2014 in order to understand the influence of environmental parameters on phytoplankton size distribution in coastal waters of South-eastern Arabian Sea. The study identified abundance of microphytoplankton around 10m depth, nanophytoplankton from surface to 5m depth and picophytoplankton in 10-20m water column. The results also showed that increased nitrate and phosphate concentration favoured nanophytoplankton growth and increased silicate concentration favoured the growth of microphytoplankton. Pre-showers and extended southwest monsoon along with variation in nutrient concentrations in the area during the study period significantly influenced the variation in size fractionated chlorophyll, absorption by phytoplankton and its numerical density. The results will provide an insight into the chemical factors that control the production cycle in this neritic system and can be used to improve the size fraction algorithms for various societal applications of remote sensing.
- ItemPerformance Evaluation of Multi-seam Trawl in Inshore waters of Visakhapatanam, North East-coast of India(Society of Fisheries Technologist(India), 2017)
- ItemDepredation and catch loss due to the interaction of aquatic organisms with ring seines off Cochin Region(Society of Fisheries Technologist(India), 2017)
- ItemAntioxidative effect of pineapple peel extracts in refrigerated storage of Indian Mackerel(Society of Fisheries Technologist(India), 2017)