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Growth performance and nutrient utilization of Clarias gariepinus fingerlings raised under different water quality conditions
Abstract
The growth performance and nutrient utilization of C. gariepinus fingerlings under different water quality conditions (static renewal; flow through and aeration with static renewal) was investigated under laboratory condition for 63 days.
Growth performance in terms of weight gain indicated that fish raise in flow through system had the highest value of 3.73 0.27g which was significantly different (P<0.05) from fish raised in aerated with static renewal (2.56 0.04g) and static renewal (2.35 0.32g). Specific growth rate (%) of fish raised in flow through system was 4.57 0.35 which was significantly different (P<0.05) from those raised in aerated and static renewal system with 3.44 0.40 and 3.20 0.36 respectively. Feed conversion ratio, protein efficiency ratio and percentage survival rate followed similar pattern with specific growth rate. Water quality analysis showed that flow through system was significantly different (P<0.05) in the values of pH(7.50) dissolved oxygen (DO) (75.50mg/l); carbon IV oxide (CO2 (10.8mg/1) and ammonia (NH3) (0.28mg/l) when compared with the values of 68.6.90mg/l; 13.08mg/ and 0.32mg/l for aerated system and 6.60; 6.10mgll; 12.19mg/l and 0.32mg/1 for state renewal system. Biological oxygen demand (BOD) value was highest (0.51mg/l) in static renewal which was significantly higher (P<0.55) than all the other treatments. Fish raised in flow through system shows the best overall performance followed by those raised in aerated system and static renewal.
(Af. J. of Livestock Extension: 2003 2: 86-90)
Growth performance in terms of weight gain indicated that fish raise in flow through system had the highest value of 3.73 0.27g which was significantly different (P<0.05) from fish raised in aerated with static renewal (2.56 0.04g) and static renewal (2.35 0.32g). Specific growth rate (%) of fish raised in flow through system was 4.57 0.35 which was significantly different (P<0.05) from those raised in aerated and static renewal system with 3.44 0.40 and 3.20 0.36 respectively. Feed conversion ratio, protein efficiency ratio and percentage survival rate followed similar pattern with specific growth rate. Water quality analysis showed that flow through system was significantly different (P<0.05) in the values of pH(7.50) dissolved oxygen (DO) (75.50mg/l); carbon IV oxide (CO2 (10.8mg/1) and ammonia (NH3) (0.28mg/l) when compared with the values of 68.6.90mg/l; 13.08mg/ and 0.32mg/l for aerated system and 6.60; 6.10mgll; 12.19mg/l and 0.32mg/1 for state renewal system. Biological oxygen demand (BOD) value was highest (0.51mg/l) in static renewal which was significantly higher (P<0.55) than all the other treatments. Fish raised in flow through system shows the best overall performance followed by those raised in aerated system and static renewal.
(Af. J. of Livestock Extension: 2003 2: 86-90)
