| dc.description.abstract | Effect of feed and fertilizer on the growth of monosex tilapia in pond was studied for 3 months
from August to November 2013 in Sylhet Agricultural University campus. The present
experiment was done under 4 treatments (one was control T0). Each treatment had 3 replications.
The size of each pond was 0.004ha and depth 1 m and stocking density 49400 (0.3 g each) per
hectare. Fry of tilapia were initially fed at 50% of their body weight in T3. Then the feeding
rate was gradually reduced up to 5% of body weight. Fish were fed twice a day. Fish of T2
was given 50% of the feed which was given to T3. Lime was administrated at a rate of 617.5
Kg per hectare in all the treatments. T1 and T2 were fertilized with cow dung, urea and triple
super phosphate (TSP) initially at a rate of 1482 Kg, 49.4 Kg and 49.4 Kg per hectare
respectively and subsequently at a rate of 370.5 kg, 9.88 kg and 9.88 kg weekly during the
experimental period. Fish were sampled fortnightly by using small seine net for weight
measurement and feeding rate and amount was adjusted. The significance level was assessed
through one way ANOVA. Significant difference (P ≥ 0.05) was observed for growth indices
such as final body weight, feed conversion ratio, specific growth rate (SGR) and yield (kg/ha)
among different treatments except T2 and T3 in case of SGR and survival rate. The highest
survival rate of tilapia were 90% in T3 with a minimum in T0 (50%). Highest and lowest FCR
value was 0.90±.06 and 0.79±.01 in T2 and T3 respectively. Specific growth rates of the
experimental fish in different treatments were maximum (6.78±.015% per day) in T3 and
minimum (4.38±0.02 % per day) in T0. Gross yield of tilapia calculated was highest in T3
(6.06±1.20 ton/ha) and lowest in T0 (0.39±0.14 ton/ha). The BCR was maximum in T3 (2.01) and
minimum in T0 (0.20). The result reveals that T3 is the best monosex tilapia culture method in
pond. | en_US |
