Journal
AQUACULTURE
Volume 547, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aquaculture.2021.737445
Keywords
Cage culture; Puntius sarana; Stocking density; Open water
Categories
Funding
- Indian Council of Agricultural Research, New Delhi, India
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The study revealed that an increase in stocking density negatively impacts the growth performances and health status of Puntius sarana, with 20 fingerlings per cubic meter being the ideal stocking density for optimal growth and health of the fish.
A 90 days trial was carried out to investigate the impact of stocking density on growth performances and the health status of Puntius sarana in inland open water cages (Salia Dam of Odisha, India). The fishes of mean body weight 32.04 +/- 1.25 g were stocked @ three stocking densities (SD) i.e., 10 m- 3 (SD10), 20 m- 3 (SD20), and 30 m- 3 (SD30) and fed with commercial feed of 28% protein and 4% fat. The growth, in terms of weight gain, specific growth rate, absolute growth rate, percentage survival, protein efficiency ratio, and feed conversion efficiency was significantly decreased (P < 0.05) with increment in stocking density, however the lowest feed conversion ratio (FCR) was obtained in SD10 (1.68 +/- 0.02). At the end of the experiment, a significant increase in red blood cells, haemoglobin, haematocrit, and platelets level was found in SD30, while white blood cells were showed a reverse trend. The concentration of superoxide dismutase, catalase, serum glucose, serum glutamic oxaloacetic transaminase (SGOT), serum glutamic pyruvic transaminase (SGPT), and cortisol were increased significantly in SD30. On contrary, the level of serum triiodothyronine and thyroxine decreased with an increase in stocking density. The higher stocking density negatively affected the amylase activity without any adverse impact on protease and lipase. The cluster analysis revealed that SD20 and SD30 came under the same dendrogram while SD10 formed a separate one. The outcome of PCA (Principal Component Analysis) revealed that increased levels of SGPT, SGOT, glucose, and cortisol negatively influenced the growth attributes. Stocking density up to 20 fingerlings m- 3 of P. sarana in inland open water cages performed ideally in terms of growth and health status of fish.
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