EVALUATION OF GROWTH, SURVIVAL AND HEMATO-BIOCHEMICAL INDICES OF COMMON CARP (Cyprinus carpio) THROUGH PARTIAL REPLACEMENT OF FISH MEAL BY MICROALGAE POWDER ISOLATED FROM SOUTH-EASTERN COAST OF BANGLADESH

Abstract

A feeding trial of 60 days was conducted after the isolation of microalgae from marinewater to evaluate the effects of Chlamydomonas sp. on growth performance, survival, water quality, proximate composition, hemato-biochemical index of common carp (Cyprinus carpio) where the microalgae was incorporated with the fish diet as a partial replacement of fishmeal. Triplicate groups of twenty uniform sized common carp fries were kept in each rectangular glass tank (40 L). In diets, Chlamydomonas sp. was added at different levels-0% (control), 5% (C5), 10% (C10), 15% (C15), commercial feed (CMF) and fed to the fish twice a day at 5% of their body weight for 60 consecutive days. At the end of experiment, random sampling of fish was done for growth parameter assessment and further laboratory analysis. The protein content of fish fry gradually ranged higher to lower from C15(35.6%), C10(33.2%), CMF (29.8%), C5(25.2%) and control (24.8%). C15 group had the highest lipid value (15.7%) and control group had the lowest one (8.4%). However, there were significant differences (p<0.05) observed among the all five treatments in terms of Average Daily Gain (ADG) whereas C15(0.017 ± 0.00 g) and C10(0.015 ± 0.00 g) were found to be significantly higher (p<0.05) respectively. In case of SGR, significant differences (p<0.05) were recorded where C15 (2.82 ± 0.03%) showed the highest SGR among the five treatments. The result revealed the least FCR value (p<0.05) in C15 (2.4± 0.003) and highest FCR value in control group (3.7 ± 0.05). The highest survival rate was found in C15 followed by C10, CMF and C5 respectively (81.67%, 71.67%, 63.33%, 58.33%) compared to the control group (43.2%). The addition of Chlamydomonas sp. to the feed improved and maintained good water quality during the culture period. RBC, Hb, Hct, WBC were recorded higher in 15% inoculation of Chlamydomonas sp. Replacement of fish meal with 15% and 10% inclusion of microalgae reported higher amount of total protein (8.52 g/dl), (7.83 g/dl) respectively followed by CMF (7.46 g/dl), C5(6.82 g/dl) and control (6.27g/dl). This study indicates that partial replacement of fishmeal by microalgae powder of Chlamydomonas sp. can be a potential source of protein and lipid having cost effectiveness and beneficial effects on common carp fry.