Effects of pH Variations on Growth and Haematological Parameters of Pangasianodon hypophthalmus (Sauvage, 1878)

Abstract

An experiment was carried out with an aim of enhancing culture of Pangasianodon hypophthalmus. Juveniles with an average length of 13.35±0.14 cm and 17.52±0.16 g of body weight were subjected to various pH levels of 7.5 (Control), 6, 9 and 9.5 to determine their growth and hematological changes. The control group exhibited the highest growth in both length (14.70±1.04 cm) and weight (21.12±2.67 g), while the lowest length (13.87 ± 0.43 cm) and weight (18.92 ± 1.11 g) in pH 9.5. The highest (1.24 ± 0.15) and lowest (0.56 ± 0.15) value of SGR was noticed in control and pH 9.5 respectively. The highest value of PER (3.79 ± 0.38) was observed in control and the lowest (1.66 ± 0.31) in pH 9.5. The highest (2.59 ± 0.47) and lowest (1.11 ± 0.16) value of FCR observed in pH 9.5 and control respectively. The highest count (26.80 ± 1.01 (103/µl)) of TLC was observed in pH 9.5 and the least (22.26 ± 0.53 (103/µl)) in control. The highest count (2.47 ± 0.15 (106/µl)) of TEC was observed in control and the least (1.97 ± 0.23 (106/µl)) in pH 9.5. The highest value (9.42 ± 0.14 g/dL) of Hb was observed in control and the least (9.5 with 5.77 ± 0.56 g/dL) in pH 9.5. The highest value (29.06 ± 0.46%) of Ht was observed in control and the least (22.41 ± 2.11%) in pH 9.5. The highest value (124.93 ± 9.99 fL) of MCV was observed in pH 9 and the lowest (114.45 ± 11.98 fL) in pH 9.5. The highest value (32.42 ± 0.76 g/dL) of MCHC was observed in control and the lowest (25.73 ± 0.87 g/dL) in the pH 9.5. The study revealed that P.hypophthalmus juveniles showed significant difference (p < 0.05) between the control and treatments. Study inferred that alterations in the growth and haematological parameters were occurred at higher pH levels compared to lower pH levels.