Haematological and hepatic changes in Catla catla fingerlings in relation to dietary sources and levels of gelatinized carbohydrate
2005
Yengkokpam, S. | Sahu, N.P., E-mail: [email protected] | Pal, A.K. | Mukherjee, S.C. | Debnath, D. (Central Institute of Fisheries Education, Mumbai (India))
The effects of three sources of gelatinized carbohydrate (GC) on haematology and hepatic structure of Catla catla fingerlings were determined. Six isocaloric (17.1-17.5 kJ/g) semi-purified diets were prepared from rice, corn, or tapioca, each at 40 or 50 percent GC. Crude protein (CP) level was fixed at 35 and 25 percent for the low GC (40 percent) and high GC (50 percent) levels, respectively. Ninety Catla catla fingerlings were distributed in 6 treatments, each with three replicates, for a 60-day feeding trial. At termination, blood haemoglobin, RBC, WBC, and liver histology were studied. Significant differences in haemoglobin, RBC, and WBC were observed among the different carbohydrate-fed groups at 40 percent GC level. With increased dietary GC level, hepatocyte hypertrophy and vacuolation was intensified. Maximum hypertrophy was noticed in the fish fed tapioca at 50 percent GC, with extensive cytoplasmic vacuolation. No mortality was found in any group at any GC level. No mortality of Catla catla fingerlings was observed due to feeding of high GC levels from corn, rice, or tapioca. However, hepatocyte hypertrophy was observed. Long-term feeding beyond 60 days may cause adverse hepatic cellular changes, but needs further research
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