Research at the University of Maryland East Coast shows that it is beneficial to replace fish meal and fish oil in tilapia diets with soybean meal and soybean oil.
Three trials were conducted at the University of Maryland East Coast under the auspices of the Maryland State Soybean Committee. The results showed that the daily weight gain and feed conversion rate of tilapia fed with several diets supplemented with 2% soybean oil The difference in learning is not significant. The researchers found that compared with low-oil diets, there was no significant difference in performance and feed conversion rate between high-oil diets fed to fish, and the performance of fish fed high-fish oil diets decreased significantly.
For decades, fishmeal and fish oil have been the standard source of high-quality protein in fish feed, but these products have recently become scarce and prices have risen significantly.
This has forced scientists and fishery owners and industry officials to look for other, cheaper sources of protein.
Research at the University of Maryland East Coast shows that linolenic acid is predominant in fish oil, and the basal diet of soybeans is actually better because it is rich in linoleic acid that is needed for tilapia. The researchers further noted that soy oil is more resistant to oxidative rancidity than fish oil and therefore has the ability to reduce the potential side effects of certain fish due to diets containing oxidized fats.
The researchers also pointed out that compared with fish oil, soybean oil can reduce the cost of the diet. This study plans to use soybean meal as the main protein source of extruded feeds, and control diets using fish oil as the main source of fat.
The three replicate test groups used 10-day-old hybrid tilapia with an average body weight of about 25 g. They were fed the control diet for 10 weeks, while another group of duplicate test diets used soy oil instead of fish oil. In order to add high levels (14.1%) of soybean oil or fish oil to the diet, two additional diets were designed to correct the control diet.
As mentioned above, there was no difference in any diet containing 2% soybean oil.
“This result gives fish fed a high soybean oil diet, and its performance, feed conversion rate, and low fish oil diets are not different, but the performance of fish fed high fish oil diets is significantly reduced. This result is consistent with previous studies. The data agreed that they believe that high levels of linolenic acid in high-fish oil diets inhibit growth," the researchers said in a report published.
“Although we are still waiting for the completion of the carcass composition analysis, we still have reason to suggest that the amount of fish oil in tilapia feed should be limited to less than 5% before further studies are completed.†Steven G., University of Maryland East Coast University Hughes said. Hughes reported that another study also showed the application prospect of soybean protein. This study evaluated the flavour of fillets made from fish that grow on a vegetable protein and pointed out that there was no difference in flavor compared to fillets from fish that were fed commercial diets that contained at least a certain amount of fish meal protein.
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