Intestine is the main digestive organ of aquatic animals, especially for fish without stomach. Intestine is often the first barrier for anti-nutritional factors and toxic and harmful substances in feed to enter fish, and it is the "starting point" for anti-nutritional factors in feed to damage related tissues and organs of fish.
Intestinal health directly affects the feed coefficient of a breeding cycle and has a very important impact on the breeding cost.
The role of fish intestines in physiological activities;
Digestion: The intestine is the most important digestive organ for fish. Protein, fat and sugar are digested in the intestine, and they are decomposed into nutrients that can be absorbed and utilized by animals and absorbed in the intestine. It is decomposed into amino acids, small peptides, glucose, glycerol, fatty acids and other substances that can be directly absorbed in the intestine. With the participation of digestive enzymes secreted by digestive glands, extracellular enzymes secreted by beneficial microorganisms living on intestinal mucosa epithelium and digestive enzymes secreted by goblet cells on the inner wall of the intestine, it is transported to relevant tissues and organs of the body through intestinal mucosa epithelial cells for utilization.
Immunity: The immune function of the intestine is mainly reflected in the following three aspects:
(1) The mucosa on the inner wall of the intestine itself is a "barrier", and the selective channel system can effectively prevent harmful substances in the intestine from entering the tissues, organs and blood circulation system of animals through the intestinal mucosa.
(2) During the growth and development of aquatic animals, the beneficial microbial flora colonized in the intestinal mucosa constantly evolves and proliferates, which together with the intestinal mucosa inhibits the proliferation of pathogenic bacteria and prevents the colonization of pathogenic microorganisms in the intestinal mucosa.
(3) The immune-related lymphoid tissues and immune cells on the inner wall of intestine can kill and remove invading pathogenic bacteria, thus preventing the invasion and infection of pathogenic bacteria.
Prevention and treatment measures of fish enteritis;
Fish enteritis and other common diseases occur frequently in the current season, and the intestine is the first barrier for fish to resist pathogenic bacteria. In order to raise fish and prevent diseases, we must first protect the intestines. So, how can we protect the intestines of fish?
1, pay more attention to the activities of fish in the pond, so as to achieve early detection and early treatment. Because most users are high-density farming, considering the water environment and the liver condition of fish, we can choose drugs that are less affected by water quality transparency and pH, and use chemical pesticides as little as possible to reduce the burden on fish.
2. Choosing high-quality bait and feeding it quantitatively and qualitatively will help to maintain the integrity of the intestine, reduce the possibility of harmful bacteria crossing the physical barrier and reduce the occurrence of diseases. Addition: 400-600g of bile acid for five consecutive days, and 0.2% of vitamin C for three consecutive days. The effect is direct and the fish condition is obviously improved. Bile acid can dredge the biliary tract, thus protecting the liver and benefiting the gallbladder, and then improving the immunity of animals.
3. Whether the intestine is healthy or not is closely related to the proportion of harmful bacteria and beneficial bacteria in the intestine. To avoid the occurrence of intestinal diseases, it is necessary to colonize beneficial bacteria, and the number must occupy an absolute advantage.
4. Keep the water environment healthy and take good care of it regularly. Regularly improve water quality; Unscheduled disinfection kills harmful bacteria.