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Subject: Fish Processing Technology × Author: DESHBHRATAR DIPALI RAVINDRANATH × End date: 2023 × Thesis Type: M.F.Sc ×
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    STUDY ON THE INFLUENCE OF FABRICATED VERTICAL PERFORATED CYLINDRICAL AERATOR MODEL ON THE GROWTH OF AQUATIC ORGANISMS
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2022) DESHBHRATAR DIPALI RAVINDRANATH; VARADARAJU S.; DESHBHRATAR DIPALI RAVINDRANATH
    Aquaculture is the fastest growing food industry in the world. Dissolved Oxygen (DO) concentration is the most important and critical water quality parameter in fish culture because of its direct effect on the feed consumption and metabolism of aquatic animals as well as indirect influence on the water quality. The cost of the mechanical aerators is more and it requires more operational and maintenance cost. So by keeping the above points in view an effort is being made to design and fabricate the vertical perforated cylindrical aerator model. The present study was conducted to assess the influence of the above aerator model on the growth of the aquatic animals. Totally six uniform sized cement tanks each having an area of 25 m2 (5 x 5 x 1 m) were selected for the study in the Research and Instructional Fish Farm at College of Fisheries. In a set of three tanks water was aerated using the above aerator model for the duration of three hours per day and other three tanks were non-aerated which served as control. The preparation of tanks was carried by following the standard procedure and water was filled for a depth of 80 cm. After fifteen days of initial fertilization, thirty uniform- sized fingerlings of common carp (Cyprinus carpio) was stocked in all the tanks for the duration of 105 days. The water sampling was carried out fortnightly in the early morning to study the changes in physical and chemical parameters, the important parameters such as dissolved oxygen, pH, ammonia, free carbon dioxide, nitrate-nitrogen, alkalinity, total-phosphorus, hardness and temperature were tested following the standard procedure. Fish sample was also collected fortnightly during the culture period to study the changes in length and weight gain. Based on the result obtained the DO content in the aerated tanks water was higher during the study period compared to non-aerated tanks water. There is not much variation in the water quality parameters both in the aerated tanks and non-aerated tanks, the same 88 were within the permissible limit required for aquaculture. In the aerated tanks, an average length and weight of the common carp increased from (4.79 ± 0.31 to 24.34 ± 0.46 cm, 5.67 ± 0.06 to 249.65 ± 9.65 g ), while in control tanks it varied from (4.81 ± 0.34 to 23.50 ± 0.23 cm, 4.97 ± 0.29 to 215.57 ± 10.28 g) respectively. It was observed that the growth of common carp (Cyprinus carpio) was higher in aerated tanks when compared to nonaerated tanks. From the present study, it can be concluded that the use of above aerator model can be an efficient aeration system for increasing the DO level in the pond water and there by increasing growth, survival and overall production of fish ultimately increase the profit of the farmers. Key words: Aeration, Dissolved oxygen, Growth performance