How to raise squid
Carp is commonly known as the bandits, mandarin ducks, and ferrets, and belongs to the genus Euphorbiae. Carp is a kind of fish that lives in warm climates and is mainly distributed in South China. In the Pearl River Basin, it is one of the main targets of river fishing and pond culture, and it has been cultivated for hundreds of years. The carp is omnivorous. Four days after hatching, the fry begins to ingest zooplankton such as rotifers, copepods, and small branches. Ten days after hatching, the body length was more than 1.4 cm. In addition to eating zooplankton, phytoplankton intake began. Since then, more and more phytoplankton have been eaten until about 40 cm after hatching. When the body length is more than 4 cm, phytoplankton are mainly consumed. At the same time, carp likes to scrape algae that grows on the surface of water or on the surface of rocks. In addition, a small amount of zooplankton and organic debris are swallowed. Under pond culture conditions, rice bran, peanut bran and other feeds can be ingested. Squid is a warm-water fish with a strong appetite at a water temperature of 15°C to 30°C. When water temperature is higher than 31°C, appetite diminishes. When the water temperature is lower than 14°C, it will gather in the deep water area and will not move. When the water temperature is lower than 13°C, stop feeding. Below 7°C, it cannot survive. Due to the poor cold resistance of eels, wintering in the ponds of the Pearl River Delta usually requires a deep pool that shelters from the sun and sometimes requires additional cold protection measures. Carp is a bottom-level fish and has a low requirement for dissolved oxygen and can adapt to more fertile water bodies. When the water temperature is between 20°C and 28°C, the dissolved oxygen level is less than 1 mg/l and normal feeding is also possible; no asphyxiation occurs when the dissolved oxygen level is as low as 0.24 mg/l. Therefore, it can be stocked in high density, generally about 1,000 acres can be placed. The growth rate of carp is slower than that of other fish. In particular, the stock density in ponds is large and the growth is slower. The first-instar fish weighs about 70 grams, the 2nd-instar fish weighs about 250 grams, the 3rd instar fish weighs about 350 grams, and 4 instars. The fish weighs about 500 grams. However, the population of the eel is high, and the eel's food specifications are not so great. It can be marketed at a weight of about 200 grams, and the economic efficiency of carp rearing is still relatively high. For fry breeding in summer, when the year is two-stage, fish species of 5 to 10 grams in weight are to be cultivated in fry and fingerling ponds, and then put into adult fish ponds at the end of the year or the following year to cultivate 50 to 100 grams of medium-sized fish species. In the third year, we will introduce polyculture into adult fish ponds and develop 200 grams of product specifications. Listing in the summer is the 2nd anniversary of the fish; in the fall, it goes through three autumns and is called "Sanqiu". It usually weighs around 250 grams. Because it has a wide range of feed sources, it adapts to a more fertile water environment, it has strong resistance to disease, and it has a high population yield, it has become a must-have variety for pond culture.