Odor is the unpleasant odor that exists in the muscles of aquatic animals. As aquatic products contain odors, on the one hand it will affect the taste of food and reduce the value of goods; on the other hand, freshwater fish with odor also does not meet the requirements of safe food. In recent years, Chinese consumers have had a deep understanding of the “odor†of freshwater fish, and this has affected the sales and benefits of freshwater fish. However, these issues have not attracted enough attention among aquaculture producers. The study of odor by scientific researchers in China mainly focuses on the odor caused by pollutants from foreign petroleum and chemical industries. The United States and other developed countries have systematically and comprehensively studied "odor odors."
Several kinds of odors commonly found in marine aquatic animals are petroleum, garlic and iodine; in freshwater aquaculture animals, soil, sewer, dish and hala are common. Among them, the fresh-water fish has the most common soil odor and is the most harmful. The odor found in the muscles of aquatic animals is mainly caused by certain chemical substances in the water body that can cause off-flavors to enter into the aquatic animals. They are absorbed through the skin and absorbed by the skin or by the muscles of aquatic animals through feeding.
The sources of odor in aquatic animals are mainly the following: First, foreign pollutants such as petroleum and phenols can cause muscle odor by inhaling or ingesting the intestinal tract through the skin of aquatic animals; second, some organisms that are present in the water environment can produce Substances that cause off-flavors produce geosmin in the freshwater algae, which produces MIB (2-methyl-2-zol). Excluding contaminants and certain substances secreted by algae in the water can cause muscle odor in aquatic animals. Feeding unqualified feeds will cause a taste of the dish. If the fish is not processed in time, the oxidation of the oil will lead to spoilage and hazel taste.
Detection of odor from aquatic animals can only be achieved by hand. Although the taste of earthworms has not been proven to be harmful to humans, people do not like this taste; oils and phenols can not only cause odors and are harmful to the human body and must be removed. At present, the following methods are used to remove odors: After odors are fed in clear water for a few days, it is best to run water, but it takes a long time to remove odor and it takes several days to remove the odor. Aquatic animal's earthy odor is related to the dominant oscillae and anchovy in the water body. Waiting for the fish to leave the pond will wait for some time. After the dominant species is replaced, the odor can be removed, but it takes a long time and is not positive. effective method. Then, the composition of phytoplankton in the pool can be changed by flushing water. In particular, cooling and flushing under running water conditions will change the composition of phytoplankton in the pool. Those phytoplankton that can cause offensive odors will change from dominant position to secondary status, thereby reducing odor levels. purpose. Decreasing the culture density and reducing feeding can also reduce the odor to a certain extent. In addition, by adding some microorganisms to the aquaculture pond and competing for nutrients with planktonic algae in the aquaculture pond, a certain degree of odor-eliminating effect can be achieved.
Several kinds of odors commonly found in marine aquatic animals are petroleum, garlic and iodine; in freshwater aquaculture animals, soil, sewer, dish and hala are common. Among them, the fresh-water fish has the most common soil odor and is the most harmful. The odor found in the muscles of aquatic animals is mainly caused by certain chemical substances in the water body that can cause off-flavors to enter into the aquatic animals. They are absorbed through the skin and absorbed by the skin or by the muscles of aquatic animals through feeding.
The sources of odor in aquatic animals are mainly the following: First, foreign pollutants such as petroleum and phenols can cause muscle odor by inhaling or ingesting the intestinal tract through the skin of aquatic animals; second, some organisms that are present in the water environment can produce Substances that cause off-flavors produce geosmin in the freshwater algae, which produces MIB (2-methyl-2-zol). Excluding contaminants and certain substances secreted by algae in the water can cause muscle odor in aquatic animals. Feeding unqualified feeds will cause a taste of the dish. If the fish is not processed in time, the oxidation of the oil will lead to spoilage and hazel taste.
Detection of odor from aquatic animals can only be achieved by hand. Although the taste of earthworms has not been proven to be harmful to humans, people do not like this taste; oils and phenols can not only cause odors and are harmful to the human body and must be removed. At present, the following methods are used to remove odors: After odors are fed in clear water for a few days, it is best to run water, but it takes a long time to remove odor and it takes several days to remove the odor. Aquatic animal's earthy odor is related to the dominant oscillae and anchovy in the water body. Waiting for the fish to leave the pond will wait for some time. After the dominant species is replaced, the odor can be removed, but it takes a long time and is not positive. effective method. Then, the composition of phytoplankton in the pool can be changed by flushing water. In particular, cooling and flushing under running water conditions will change the composition of phytoplankton in the pool. Those phytoplankton that can cause offensive odors will change from dominant position to secondary status, thereby reducing odor levels. purpose. Decreasing the culture density and reducing feeding can also reduce the odor to a certain extent. In addition, by adding some microorganisms to the aquaculture pond and competing for nutrients with planktonic algae in the aquaculture pond, a certain degree of odor-eliminating effect can be achieved.