Utilization of
gelatinized carbohydrate in diets of Labeo rohita fry
M. Mohapatra, N.P. Sahu , A. Chaudhari-2003
Aquaculture
Nutrition, 9(3) :
189-196
Abstract :
A total of 180 Labeo rohita fry (
approx. 1 g) were distributed into six treatment groups with three
replicates each. Six isoenergetic (15.8 kJ g-1)
diets were prepared with varying levels of protein (CP) and gelatinized
carbohydrate (GC), viz. D1: 450 g kg-1
CP, 258 g kg-1
GC; D2: 400 g kg-1
CP, 302 g kg-1
GC; D3: 350 g kg-1
CP, 399 g kg-1
GC; D4: 301 g kg-1
CP, 447 g kg-1
GC; D5: 249 g kg-1
CP, 517 g kg-1
GC and control diet, D6: 400 g kg-1
CP, 468 g kg-1
GC and these were fed to fish at 40 g kg-1
wet body weight per day for 60 days. Highest growth was recorded for
fish fed D4, decreasing for D5. Protein utilization,
amylase activity and carbohydrate digestibility were significantly
positively correlated with GC (P < 0.05) and were
highest in fish fed D5. Hypertrophy of hepatic cells was only
recorded for D5. Lysine, which may be affected during
gelatinization, was estimated in diets and found to be above the minimum
level required. Survival rate was unaffected by diet. The results of the
present study indicate that a diet containing 450 g kg-1
GC and 300 g kg-1
CP was efficiently utilized by L. rohita fry.
(Division of Fish Genetics and
Biotechnology, Central Institute of Fisheries Education, Versova, Mumbai,
400 061, India. E-mail of A. Chaudhari: aparnachaudhari@hotmail.com)