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  • 1
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    Induced breeding, embryonic and larval development in Heteropneustes fossilis (Bloch) in the agro-climatic conditions of Maharashtra (2021)
    In:  http://aquaticcommons.org/id/eprint/15921 | 12051 | 2015-01-16 08:43:24 | 15921 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-11
    Description: Heteropneustes fossilis was induced bred for the first time in the agro-climatic conditions of Maharashtra, India. The embryonic development was completed within 16-18h after fertilisation. Head and tail ends were distinguishable after 3h and 11-12 somites were visible after 6-7h. The eggs started hatching after 14h of incubation. Average hatching time was 16-18h at 26 degrees C. In first day old pro-larva, notochord was deflected upwards, eyes were darkly pigmented and alimentary canal appeared. In fourth day old post-larva intestinal coiling could be seen and yolk was absorbed. Aerial respiration started by 8th day. The 10 day old post-larva was free swimming and fed voraciously attaining a length of 20 mm in 30 days.
    Keywords: Aquaculture ; embryonic development ; biological development ; Heteropneustes fossilis ; freshwater ; Maharashtra ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 15-19
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  • 2
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    Nutrient profile of pond water in north-eastern state of Tripura and impact of water acidity on aquaculture productivity (2021)
    In:  http://aquaticcommons.org/id/eprint/17917 | 12051 | 2015-09-23 08:08:03 | 17917 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-02
    Description: Physicochemical parameters of 31 fish pond water samples of Tripura were studied to ascertain the nutrient profile of acidic soil zone and the impact of water acidity towards aquaculture productivity. The pH was acidic (mean 6.63±0.44) with high Fe (mean1.04±0.40 mglˉ¹) and AI (mean 2.67±2.41 mglˉ¹) contents. These were mostly responsible for pond water acidity and poor productivity with low nitrogen, phosphate and total alkalinity. The study also showed strong negative relationship between water pH and redox potential (R²=0.5251). However, pH was positively significant with electrical conductivity. The roles of redox potential and electrical conductivity in water acidity were found highly important. Available calcium content was also found low (mean 2.91±2.96 mglˉ¹). Elevating level of pH of pond water could be the possible management practices in acidic water so that such unproductive water might be productive enough with higher phosphate and nitrogen levels for better biological production.
    Keywords: Aquaculture ; red acid soil ; acidic water ; pH ; redox potential ; aquaculture ; productivity ; Tripura ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 9-17
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