| || || Koroi, Temalesi|
| || || The use of local feed ingredients in the culture of the freshwater prawn macrobrachium rosenbergii in Fiji |
Author: Koroi, Temalesi
Institution: University of the South Pacific.
Call No.: Pac SH 380 .62 .F5 K67 2012
Copyright:10-20% of this thesis may be copied without the authors written permission
Abstract: A nutrition study was conducted to evaluate the growth performance, survival rate, feed intake, proximate and cost analysis of feeds for freshwater prawn (Macrobrachium rosenbergii) using low cost diets made with ingredients locally available in Fiji. This study was divided into two phases. Phase I (Experiment 1 & 2), which was ingredient inclusion experiments was carried out in 18 (6 treatments x 3 replicates) one-hundred L aquaria in a closed recirculation system. Experiment 1 tested varying inclusion levels of fish-FM, meat-bone-MBM and meat-fish meal- MFM. Experiment 2 tested varying inclusion levels of wheat-WHT, mill mix-MM, copra-CP and pea meal-PM. Phase II (Experiment 3), was carried out in 12-earthen ponds (4 treatments x 3 replicates) for 124 days, testing two experimental low-cost feed formulations using FM, MBM, WHT, CP and PM against two commercially available feeds (Crest Tilapia and Pacific Prawn). The level of inclusion of ingredients in Experiments 1 & 2 did not show any significant difference (P≤ 0.05) in growth performance, survival rate and feed intake of the freshwater prawn M. rosenbergii. This suggests that inclusion levels for feeds formulation of diets for freshwater prawn M .rosenbergii could be quite flexible. The 124 days pond experiment showed overall no statistically significant differences (P≤ 0.05) for growth performance, survival rate and feed intake of prawns. In terms of value, Diet 1 showed slightly higher weight gain (9.28 ± 0.42 g), slightly higher SGR (2.25 ± 0.01 %/ day) and lowest and best FCR value of 0.97±0.02 compared to Diet 2 and the two commercial feeds. Survival rates ranged between 83.05 ± 3.22 and 88.84 ± 0.48 with slightly higher survival value seen in prawns fed experimental Diet 2 compared to Diet 1 and two commercial feeds. Further comparing the two commercial feeds, Pacific Prawn feed showed better values of weight gain (8.87 ± 0.65 g), SGR (2.21 ± 0.02 %/day) and FCR (1.09 ± 0.02). The study showed that it cost FJ$1.05 to produce 1 kg of prawn by Diet 1 which was cheaper when compared to the commercial diets Pacific Prawn feed (FJ$1.66) and Crest Tilapia feed (FJ$1.34). The investigation indicated that M. rosenbergii growth, survival rate and feed intake was slightly better with experimental Diet 1 containing 44.5 % fish meal, 5.0 % copra meal, 5.0 % pea meal, 43.5 % wheat and 2.0 % vitamin-mineral premix. Based on growth, yield and feed cost it may be suggested that this Diet 1 could be further tested in a pilot study before suggested to be used commercially for monoculture of M. rosenbergii in ponds in Fiji.