Evaluation of Effect of the Different Stocking Densities on Growth Performance, Survival, Water Quality and Body Indices of Pearlspot (Etroplus suratensis) Fingerlings in Biofloc Technology

Abstract

Background: This experiment was conducted to evaluate the effect of different stocking density on growth performance, survival, water quality and body indices of E.suratensis fingerlings for 90 days at PRFF, Pazhaverkadu. Methods: Three different stocking densities are 100, 200, 300 no of fishes/m3. The fingerlings of pearlspot, E.suratensis with an average body weight of 5.05±0.03 g were stocked at a rate of SD-1 (100/m3), SD-2 (200/m3) and SD-3 (300/m3) culture for a period of 90 days. Result: The growth parameters were found to significantly decrease with increasing stocking density in the biofloc rearing system. Result of Nitrite and nitrate concentrations were significantly lower in the BFT treatment with lower stocking density than in higher stocking density (P less than 0.05). The highest mean body weight gain recorded in SD1 (42.37±0.04 g) followed by SD2 (29.98±0.08 g) and SD3 (20.85±0.06 g). BFT significantly increased fish specific growth rate and net yield. There was no significant difference in hematology analysis (in terms of white blood cell and red blood cell counts, hemoglobin and hematocrit levels), total superoxide dismutase activity of fish between different stocking density (P greater than 0.05). Second-order polynomial regression analysis of weight gain against pearlspot culture under lower stocking stocking density (100/m3) indicate that biofloc technology culture with lower stocking density can improve the growth performance and immune response and also the maintenance of good water quality and improvement of feed utilization of pearlspot.

Influence of in situ Biofloc Production on Bio Growth Performance, Physiological Immune Response, Digestive Enzyme Activity, Nutrient Composition and Disease Resistance of Etroplus suratensis

“…Nitrite-100 nitrogen concentration was significantly (P<0.05) lower in treatments than control. The results of the water quality parameters on biofloc development with the jaggery as a carbon source was agreed well with findings of Sakkaravarthi et al, 2015;Ruby et al, 2022;Elaiyaraja et al, 2020;Susitharan et al, 2021).…”

Effect of Dietary Seaweed Supplementation on Growth, Feed Utilization, Digestibility Co-efficient, Digestive Enzyme Activity and Challenge Study against Aeromonas hydrophila of Nile Tilapia Oreochromis niloticus

“…It should be noted that the height and width of intestinal villi and the number of goblet cells directly impact the digestion and nutrient absorption in fish (Elsabagh et al, 2018). The presence of antioxidant properties can prevent the oxidation of biological molecules, particularly lipids and proteins, consequently improving the processes of digestion and absorption (Mohan et al, 2019 andRuby et al, 2022). Similarly, the results presented in Table 5 of this study also confirm that GIF tilapia fed with fermented Ulva meal exhibited positive responses in apparent digestibility coefficient.…”

Efficacy of in situ and ex situ Biofloc on Growth, Immune-physiological Responses, Nutrient Composition and Muscle Growth-related Gene Expression of Etroplus suratensis

“…The bio-growth parameters of fish like percentage weight gain, specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER) and survival rate were calculated (Ruby et al, 2022).…”

“…Similar results were documented by Ezhilarasi et al (2019) and Elaiyaraja et al (2020). Various studies resulted in in situ biofloc performing higher growth in biofloc-raised tilapia (Crab et al, 2009;Azim and Little 2008;Elaiyaraja et al, 2020), L. rohita (Mahanand et al, 2013;Ahmad et al, 2016), Carassius auratus (Wang et al, 2015), Cyprinus carpio Najdegerami et al (2016) and Etroplus suratensis Ruby et al (2022) which indicates that biofloc can substitute aquatic animal feed and can promote the growth of diverse fish species. Efficacy of in situ and ex situ Biofloc on Growth, Immune-physiological Responses, Nutrient Composition and Muscle Growth...…”