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Studies have shown that fish need not only meet the demand for high-protein and high-calorie foods, especially amino acids, but also have no side effects on organisms. In addition to fish flour, the most suitable fish is the combination of amino acids and methanol amino acids in bean sprouts. French bean sprouts produce very little. To develop a mix of raw materials (wheat, bean sprouts, canola, high-protein peas, and lupin), researchers began to consider other French vegetable protein materials. Experiments on a wide variety of fish have yielded exciting results.
BIOMAR, located in Nersac, southwestern France, specializes in the research of farmed fish feeds. They have incorporated 5% to 30% of vegetable protein in the formulated feed. Michel Autin, the company’s research manager, is convinced: “One day, the amount of plant protein in fishmeal will reach 100%, which is also a general trend, because the production of fish flour has reached its maximum, and biological breeding has been improving.â€
The second topic they studied was the demand for calories from fish. In nature, when fish consume calories, they decompose the lipids and proteins of foods, which is the metabolism of proteins to heat. However, this method of calorie consumption has two disadvantages. First, the cost is high (the net recovery cost of protein is much higher than lipids and sugars), and the polluted ammonia is discharged to other places. Researchers are testing plant lipids and the preliminary results are very fruitful.
The nutritional quality of fish depends on the fat it contains. The researchers found that to make fish rich in omega-3 fatty acids, you can use linseed oil, olive oil, or rapeseed oil during the growth of the fish and use fish oil in the final stages of animal husbandry to balance the fish's omega-3 fatty acids. To the natural level. For squid, the average feeding period is 12 months. Only the vegetable oil is fed for the first 6 months of growth. The use of fish oil for 6 months after feeding can make the fish in the consumer's plate contain enough ω-3 fatty acids. . For larger carps, switching to fish oil in the last 6 months of the feeding period is enough. Researchers believe that the study of oil is more important than the study of protein because the supply of fish oil can cause mishaps during the fishing season.
France's research on raising fish fat feed was included in the European RAFOA research project, which involved four species of fish: salmon, trout, bar fish, and salmon. The project also included research organizations in Scotland, Norway, and Spain.
French scientists develop new feed for fish farming
In France, most farmed fish are reared in natural environments and fed with feed made from flour and fish oil. In order to avoid the scarcity of marine resources, researchers at the National Institute of Agronomy (IN?RA) and IFREMER de Brest in Bordeaux, Névelle, France, after more than a decade of research, have successfully deployed new feeds for farmed fish - consisting of bean sprouts, rapeseeds, and grains. Plant feeds. Researchers at the Bordeaux National Agronomy Research Institute first studied protein sources and tested a large number of fishmeal plant substitutes as feed for rainbow trout and barnacle catfish. The test materials were bean sprouts, rapeseed, high protein peas, lupins, wheat and Corn gluten, etc.