Abstract
High protein content in maggot is one of the advantages for increasing fish growth through artificial feed. This study aimed to find the best optimization and feed formulation for fish meal substitution with maggot meal on growth, feed utilization efficiency, and survival rate of milkfish (C. chanos). Milkfish (C. chanos) with an average weight of 0.62±0.01 gram/fish was used as test fish. Feeding is carried out at 07.00 a.m., 12.00 p.m., and 17:00 p.m. through fixed feeding rate method. The tested fish was kept for 42 days with a stocking density of 1 fish/l. The experimental design used was a completely randomized design with five treatments and three replications. The treatments which had been done were fish meal substitution with maggot meal as follows: A (0%), B (25%), C (50%), D (75%), and E (100%). The research parameters included total feed consumption (TFC), feed utilization efficiency (FUE), protein efficiency ratio (PER), relative growth rate (RGR), survival rate (SR), and water quality. The results showed that the fish meal substitution with maggot meal had a significant effect (p<0.05) on FUE, PER, RGR and had no significant effect (p>0.05) on TFC and SR. The best treatment of each treatment is in treatment C with a composition of 50% maggot meal substitution on fish meal which resulted in a TFC value of 40.17±4.58, FUE of 27.51±0.77, PER of 0.83±0.03%, and RGR of 2.34±0.10.
Highlights
Maggot is one of the abundant wastes and widely available in the community, but cannot be utilized maximally
The highest total feed consumption (TFC) value was in 100% of maggot meal substitution that was 47.20±2.51 g and the lowest was in 50% of maggot meal substitution that was 40.17±4.58 g
The highest protein efficiency ratio (PER) value was in 50% of maggot meal substitution that was 0.83±0.03% and the lowest was in 0% of maggot meal substitution that was 0.68±0.01%
Summary
Maggot is one of the abundant wastes and widely available in the community, but cannot be utilized maximally. Maggot is a black soldier fly larvae (H. illucens) egg, which has not been utilized optimally. Maggot meal comes from maggot in the pre-pupa phase because in this phase, maggot has a high protein content. Maggot meal has advantages over other artificial feed ingredients, which is rich in protein and amino acid nutrients (Cummins et al 2017). Maggot meal (H. illucens) has higher level nutrient contents such as 40-50% of protein content, 30% of fat, and amino acids such as cystine, histidine, tryptophan, and tyrosine than fish meal (Ajani et al 2004). The price of maggot meal is relatively cheap and it is cultivated
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