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20201
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Subject: Aquaculture × Author: Arya, Diksha × End date: 2024 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Assessment of Azolla efficacy on growth and survival of grass carp (Ctenopharyngodon idella)
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-12) Arya, Diksha; Khati, Akansha
    A feeding trial of 90 days was conducted to examine the efficacy of Azolla on growth and survival of grass carp (Ctenopharyngodon idella) fingerling. Azolla microphylla was selected for the experimentation due to the suitability of this species to grow in the cold climate. Cultivation of azolla, cooking treatment to reduce the anti nutritional elements from fresh azolla, proximate composition of azolla, preparation and proximate composition of test diets, data observation on length and weight, L-W relationship, condition factor, FCR, survival rate, growth assessment by RNA:DNA ratio and recording of physio- chemical parameters of pond water were the major work elements of the study. Azolla can be incorporated upto 40%, which is favourable for better growth and also reduce the high priced protein ingredients in the feeding of grass carp fingerlings. Cooked azolla at 1000C for 15min is more useful for growth of fingerlings rather than use of fresh azolla. Azolla seems to be good replacer of protein from expensive sources such as mustard oil cake, soybean cake depending on feeding habits of the species. Also, the dietary Azolla supplementation shows to have a positive effect on growth and survival of fish without deteriorating the water quality. Use of cooked azolla rather than fresh azolla would be helpful for the aquaculture of grass carp in mid hill conditions. Findings of the study are directly applicable for the coldwater aquaculture practice.