First, the biological characteristics of the gums Gingiva commonly known as flounder, dental films, partial mouth and so on, is a catus-shaped head, Acridoidea, Acrididae, Gingivalis. Adult fish are significantly flat. When hatched, larvae are symmetrical in shape and do vertical swimming. As the larvae grow, the right eye moves to the left and finally fixes above the left eye. Its swimming posture also changes from vertical swimming to horizontal swimming. The jaws are larger and the two jaw teeth are in a row. The dogs are dentate. The dorsal fins start from the no eye side of the upper orbital rim, and the pelvic fins on both sides are roughly symmetrical. There is a scale on the side of the eye and no roundness on the side of the eye. It is dark brown or gray-brown on the side of the eye and is dotted with dark brown and white round spots. No eye side is generally white. The lateral line is in the pectoral fins, curved above, with no accessory branches, and no lateral lines on the side of the eye. The inner fins of the pectoral fins without branches are branched. 1. Distributed gingiva are distributed on the banks of the Bohai Sea, Yellow Sea, East China Sea, Japan, and the Korean Peninsula in China. They are cold and warm demersal fishes, and they inhabit sandy seabeds with low water temperatures. 2, environmental adaptability: 1 water temperature: high temperature on its growth. The lethal water temperature is below 2°C. When the water temperature reaches 33°C, adult fish can only survive for a short time. The optimum water temperature for the development of dental caries and juveniles is 16-21°C. Cultured gingiva did not ingest water at temperatures below 5°C. Below 13°C, the food intake at 23°C decreased. Below 10°C, it did not increase feeding and stopped growing above 25°C. Water temperature increased gradually with the increase of water temperature within the range of 10-24°C. Increase, when the natural temperature rises above 25 °C, must use well water (water temperature is generally 16-18 °C) to mix seawater to achieve the purpose of cooling. Water temperature exceeding 27°C is dangerous, and long-term exposure to 27°C can easily cause a large number of deaths. At the same time, when the gums are 5mm-15mm, the water temperature has a great influence on the whitening. 2 Salinity: The gums are broad-salt fishes and have a good ability to adapt to changes in salinity. They can live in estuaries with a salinity less than 0.8%. Due to the strong ability to adapt to the low-salt environment, the tolerance to low-salt increases the optimal salinity for the individuals with the increase of individuals to be 1.7-3.3%. 3 Dissolved oxygen: Gingival endurance to hypoxia is stronger than that of true squid and squid, and the lethal concentration of dissolved oxygen is 0.6-0.8 mg/l. It is required that the amount of dissolved oxygen in the cultured gum pool should be higher than 4 mg/l. 4 Illumination: Shading of gingival seedlings is a must. The light is too strong, the seed will become very weak, and the light has a great influence on the larvae. 3. Ingestion Habits Gingival caries are typical carnivorous fishes, and are mostly small fishes in the natural environment. From juvenile to juvenile period, they mainly consumed small crustaceans such as copepods, clams, amphipoda and decapods. Accompanied by the growth of feeding small fish, and prey on squid, squid, shrimp, shellfish, shellfish and other organisms. When fully cultured, supplemental feed was added from the seedling stage on the 10th day after hatching. The intake of gums is greatly affected by the temperature of the water. The water temperature is below 10°C and the feeding is completely stopped. In the range of 10-20°C, the feeding activity is very strong. When the water temperature reaches 25°C, the appetite begins to decrease. When the water temperature exceeds 27°C, the feeding is stopped.
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