1 Background
Striped Catfish is the main species of aquaculture in Vietnam. In 2017, the aquaculture production was about 12.5 million tons. Striped catfish is dominated by high-density, high-yield pond farming mode. Feed is the main component of aquaculture cost. Further reducing the feed cost has become the main measure to improve the profit for farmers.
Fortide is a peptide product derived from deep processing of plant protein with a peptide content of over 29%. It has been shown to optimize intestinal function, enhance the body's immune regulation and anti-stress ability, and promote nutrient digestion and deposition. By using Fortide, it is possible to reduce the usage of fishmeal in the fish feed of striped catfish or to reduce the level of feed protein, thereby reducing the cost of fish feed.
2 Test purpose
The trial was designed to assess the effect of the commercial feed of striped catfish on reducing fishmeal or reducing the protein by 2% after the addition of Fortide on striped catfish weight gain, specific growth rate, feed coefficient, survival rate and cost of fish feed.
3 Test materials and methods
3.1 Test design
The experiment was conducted at the experimental station of the fisheries college of Ho Chi Minh Nong Lam university in Vietnam. There were 3 treatment groups, each with 4 replicates. Select 1560 fish (initial weight 14.1 g/tail) with close weight and health condition, and randomly divide into 12 cages (2 m*1 m*1.3 m). The cages are installed in 300 m2 ponds. Each box are with 130 fishes.
3.2 Test diet
3 diets were set up for 3 treatments, 1 for commercial striped catfish feed (control group), 2 for treatment (adding 0.8% Fortide and reduce 0.8% fish meal), and 3 for treatment (reducing 2% protein and adding 0.8% Fortide). The composition and nutritional level of the feed are shown in tables 1 and 2.
3.3 Feeding management
The test materials are all floating materials produced by the feed mill, and fed twice a day. The remaining feed was collected after 1 hour of feeding and the feed intake was calculated. A plastic mesh is used in each cage to prevent the test fish from running away. the trial was carried out for 5 weeks. At the end of the trial, each group was weighed and the final weight, specific growth rate (SGR), feed coefficient (FCR), survival rate and feed cost of striped catfish were calculated.
Water quality was measured during the test, including dissolved oxygen, temperature, PH, and ammonia nitrogen. In order to maintain optimal environmental conditions throughout the test period, the water in the pool was periodically exchanged and an aeration system was installed.
4 Data analysis
The data were analyzed by SPSS software. The One-way analysis of variance was used to analyze whether there were significant differences among the indicators (p < 0.05). The differences between groups were compared by Duncan method.
5 Test results
See Table 3 for the final weight, specific growth rate (SGR), feed coefficient (FCR), survival rate and feed cost. Although there were no significant differences in all the indicators of the three treatment groups (p > 0.05), the absolute values were improved. Whether it is to reduce fishmeal or reduce the protein by 2%, the FCR is reduced by about 5%, and the feed cost per kilogram of striped catfish is reduced. Among them, the reduction of 2% protein is the most economical for the cultivation of striped catfish when adding Fortide. At the same time, this program also saves feed protein resources, reduces emissions and ameliorated the water environment.
At the end of the trial, each group was weighed and the final weight, specific growth rate (SGR), feed coefficient (FCR), survival rate and feed cost of striped catfish were calculated.
6 Conclusion
According to the experimental, the following conclusions are drawn: the feed cost can be decreased by reducing fish meal or reducing 2% protein and adding Fortide. Therefore, it is recommended to use Fortide in commercial feeds of striped catfish to increase the benefit in culture and promote the sustainable development of the aquaculture industry.
Comments