A study of the relative efficiency of mustard oil cake and urea and the effect of salinity in plankton production in indian fishponds |
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| Authors: | S R Ghosh |
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| Institution: | (1) Present address: Central Inland Fisheries Research Institute, Barrackpore, India;(2) Central Inland Fisheries Research Sub-Station, 19, Cantonment Road, Cuttack - 1, Orissa, India |
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| Abstract: | Augmentation of plankton production in Indian fishponds by application of manure and inorganic fertilisers was studied in laboratory experiments. The effects of the salinity of the medium were also examined.Laboratory trials were made with mustard oil cake and urea on equivalent nutrient bases in media with varying degrees of salinity (0–30 ppt at 2 ppt. intervals). It was observed that Closterium, Fragilaria, Pinnularia and Gyrosigma grew well in the higher salinity range between 24 to 30 ppt. whereas lower salinities ranging from a trace to 8 ppt. are suitable for improved production of Anabaena, Synedra, Navicula, Amphipleura, Amphora and Nitzschia. Comparatively better production of plankton was recorded with urea than with mustard oil cake. |
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| Keywords: | Manure inorganic fertilizers salinity range plankton production |
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