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20232
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Subject: Aquaculture × End date: 2023 × Start date: 2020 × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    Comparative study on the effects of different sheds on the growth performance of Vietnam koi (Anabas testudineus Linn.) fish in biofloc system
    (CCSHAU, Hisar, 2023-06) Sandeep Kumar; Dahiya, Tejpal
    This thesis titled "Comparative study on the effect of different sheds on growth performance of Vietnam koi (Anabas testudineus Linn.) in Biofloc system" aimed to compare the effectiveness of two biofloc systems (with green net and tin shed) in maintaining water quality parameters for successful Vietnam koi fish culture. The study was conducted from June 2022 to December 2022 for six months, comparing the average weight and length gain, survival rate, specific growth rate (SGR), and water quality parameters between the two systems. The study found that both systems were effective in maintaining water quality parameters, but the green net shed biofloc system showed better results in terms of fish growth (110.16 g), nitrite (0.20 mgL-1), floc volume (27.76 mlL-1), alkalinity (208.07 mgL-1), and maintenance of optimum temperature (28.740C). A. testudineus reared under the green net shed biofloc system had significantly higher daily weight gain (0.99 g) and lower feed conversion ratio (1.05) than those under the tin shed biofloc system. The specific growth rate (SGR) was not significantly different between the two systems (1.79 g and 1.69 g for green net and tin shed respectively). The study observed that ammonia levels were higher (0.31 mgL-1) in the tin shed than green net shed (0.27 mgL-1) biofloc system and was within the acceptable range for Vietnam koi farming. The results of this study suggest that the green net shed biofloc system is a better option for successful Vietnam koi fish culture in terms of growth performance and water quality parameters.
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    ThesisItemOpen Access
    Effect of stocking density, salinity & Azolla based feed on growth and survival of Indian Butter Fish Pabda (Ompok bimaculatus)
    (CCSHAU, Hisar, 2023-07) Maurya, Mitrasen; Ahalavat, Shikha
    The present study was conducted to know the effect of stocking density, salinity and azolla based feed on growth and survival of Indian butter catfish (Ompok bimaculatus). The experiment was carried out for 45 days (1st experiment), 45 days (2nd experiment) and 60 days (3rd experiment). In first set of experiment, the fingerlings of O.bimaculatus were stocked under three different stocking densities such as 10 fingerlings/tank (T1), 15 fingerlings/ tank (T2) and 25 fingerlings/ tank. Under first experimental study, the highest weight gain, specific growth rate, and length gain were found in O.bimaculatus at a lower stocking density (10fingerlings/tank) with values of 2.95 g, 1.12%, and 1.10 cm, respectively. The lowest FCR was recorded (1.90) in T1 (10fingerlings/tank) and highest (2.58) was recorded in T3 (25 fingerlings/tank). A 100% survival rate was observed at a lower stocking density of 10 fingerlings per tank, while an 88% survival rate was observed at a higher stocking density. In the second objective of my research work, the survival rates were determined to be 100% in T1 (0.5 ppt), 96.66% in T2 (2 ppt), 63.3% in T3 (4 ppt), and 33.3% in T4 (6 ppt). Additionally, it was observed that weight gain was highest at lower salinity levels (0.5 ppt), while the lowest weight gain was recorded at higher salinity levels (6 ppt). fishes growth declined significantly at 4 and 6 ppt (p≤0.05). Under my research work, the effect of different percent of Azolla diet in combination with commercial feed on the growth and survival of O. bimaculatus was observed in the last experiment. fingerlings of O.bimaculatus were reared under four treatment such as T1(Commercial diet), T2( Commercial diet + 20 % Azolla), T3(Commercial diet + 30% Azolla ) and T4(100%Azolla).Under third experimental study, the highest DWG, ADWG and SGR were found in fingerlings in T2( Commercial diet + 20 % Azolla) with values of 0.29 g, 0.31 g, and 1.75% respectively and lowest in T4(100% Azolla ) with values 0.04 g, 0.04g and 0.39 %. FCR was recorded better in T2(1.61) than T1(1.87), T3 (1.96) and T4(6.61). A survival rate of 83.33% to 96.66% was achieved in the third experiment of my research study, even in the control group and with a 100% Azolla diet. A high rate of survival was observed in both the T2 group and the control group.