Higher water temperature enhances dietary carbohydrate utilization and growth performance in Labeo rohita (Hamilton) fingerlings.
A 60-day experiment was conducted to delineate the effect of three dietary levels of gelatinized carbohydrate (GC) on growth, nutrient-utilization and body composition of Labeo rohita fingerlings (avg. wt 6.5 ± 0.3 g) reared at two water temperatures (ambient-AT (26 ± 0.8 °C) and 32 °C). Two hundred and sixteen fingerlings were randomly distributed into six treatments in triplicates. Three semi-purified isonitrogenous diets were prepared with graded levels of GC viz. D(1) : 40%, D(2) : 50% and D(3) : 58%. Growth rate, feed efficiency and protein efficiency ratio were significantly (p < 0.05) higher in 50% GC and 32 °C reared groups than their AT counterparts. Hepato Somatic Index was higher in AT reared groups compared to 32 °C reared counterparts. Apparent digestibility co-efficient of carbohydrate was significantly (p < 0.05) higher at 32 °C reared groups but decreased with increasing carbohydrate (GC) levels. Fish reared at 32 °C showed significantly (p < 0.05) higher amylase, protease and hexokinase activities while glucose-6-phosphate dehydrogenase and glucose-6-phosphatse were significantly (p < 0.05) higher at ambient temperatures. The results obtained in present study indicated that L. rohita could utilize higher level (50%) of dietary carbohydrate at 32 °C.
Division of Fish Nutrition, Biochemistry and Physiology, Central Institute of Fisheries Education, Mumbai, India. cijialex83@gmail.com
C
C
Alexander
N P
NP
Sahu
A K
AK
Pal
M S
MS
Akhtar
S
S
Saravanan
B
B
Xavier
S
S
Munilkumar
D000822:Animal Husbandry; D000818:Animals; D004040:Dietary Carbohydrates / Q000378:metabolism*; D004734:Energy Metabolism; D005399:Fishes / Q000254:growth & development*; D014867:Water
D004040:Dietary Carbohydrates; D014867:Water