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Freshwater fish nursery habits
Many fishes have nursery habits after spawning. All fish that have child-rearing habits are most likely to nest and spawn. Since these fish spawn fewer eggs every year, the number of grains is only a few thousand at most. Parental care practices have positive implications for the survival of eggs and juveniles and for the avoidance of predation by predators. In the broodstock near the eggs and fry, not only to guard the eggs or seedlings, to drive off the enemies of encroachment, but also continue to clear the nest of debris, or stir up the water flow, in order to maintain a good environment in the nest. After spawning, the female fish is away from the nest and the male fish is always guarding near the fish nest, chasing other fish close to the nest, cleaning debris from the nest, and even moving the eggs out of the nest. Perform cleaning and repairs in the nest. After spawning, the eggs are floating on the floating nest surrounded by aquatic plants. Male and female fish or only males are lurking at or near the bottom of the nest to drive away other enemies that come to devour their eggs. When larvae (11-13 mm in length) are hatched about 3-4 days after hatching, the juveniles are restricted to swimming near the nest, and the defensive activities of the broodstock are strengthened. Fish or frogs attack the seedlings, and they will go all out to drive off the enemy. When the larvae have grown to 1-3 cm in length, the action is lively and the range of activities is expanded. At this time, the broodstock is clustered with it. By the time the juvenile grows to 5-8 cm, it has passed 20 days of guarding juveniles. With its independent ability to live, it begins to spread in groups and the broodstock ceases nursing. After the betta lays eggs, the female fish will leave and the male fish will be nursing alone. It will continue to move around the bubble nest and drive off the females who are about to swallow the eggs. If the eggs are scattered by the wind or blown away by the wind, the male fish Feel the egg back at any time and put it back into the bubble nest. After hatching, the larvae temporarily attach to the nest bubble. If the larvae sink, the male fish will drag it back into the nest. This kind of conservation work has been maintained until larvae can feed on their own, and they are allowed to leave their nests to live on their own. Stingray is also a male guarding the nest. After the females spawn, they leave the nest and feed. Only the male fish floats in the nest or swims around the nest to protect the eggs and larvae. If other fish swim near, they will be expelled from their nests and threaten their own safety. The situation, that is, leave the nest and avoid it, return to the original nest guard after calm. Until 7-8 days later, when the larvae were able to swim and feed freely from their nests, the male fish stopped guarding. During this period, the male fish did not eat. There is a kind of spear-tailed complexion of tigerfish that is similar to stingrays. When spawning, the females leave and leave the males spawning. When the larvae hatch, the brooders lose weight and die. Tilapia are all digging nests and are guarded by female or male fish after fertilization. In some species, the eggs are hatched in the mouth. For example, when the mussels are used to reproduce the tilapia, the males dig in the shallow water to build a nest, and the females spawn males in the nest, and then the females will Eggs and sperm were inhaled and hatched in the mouth. The newly hatched juvenile remains in the mouth of the female fish until the yolk sac disappears and leaves the mother's mouth to live alone. But in the first few days from the mother's mouth, in case of predators, the female fish sucked back into the mouth to protect. During spawning hatching, males are guarding nearby to prevent predators and intrusions. After juveniles live independently, broodstock no longer knows their “childrenâ€, and sometimes even devours their “children†as foodstuffs. Another large tilapia is hatched by males, and the method of child care is similar to that of tilapia. In the dovetail of the rivers of South America, during reproduction, the abdominal skin of the female fish expands and becomes soft. After the eggs are fertilized, the female fish is laid on the eggs so that the eggs are embedded in the soft abdominal skin. Eggs are connected to the mother by small stems with arteriovenous vessels. After the hatching of the larvae, the abdomen of the female fish is restored to its original shape.