Freshwater Shark Life Growth Habits

Freshwater shark belongs to the genus Cylinnus, and it is commonly known as the belly of the pangasius. It is called a “freshwater shark” because its body is sharklike. In fact, it is not related to sharks. It is also known as tiger head shark, pudding fish, or Bazhen fish. It is mainly distributed in Southeast Asia. It has three colors: black, white, and gray. It is divided into river system and sea system. The black freshwater black shark is native to Thailand and was introduced to China in 1978. The white freshwater white shark is native to Malaysia and was introduced to China in 1998. The grey shark, called the Malaya River system, is of good quality. 2000 Years of introduction in China.

Habits of life Freshwater sharks like benthic life, often in the middle and lower layers of water. The liveliness of the temperament, the quickness of swimming, and the constant stimulation of the outside world, that is, the continuous eagerness in the water, is similar to that of the White Pelican.

Freshwater sharks are omnivorous fish dominated by meat and are very bulimia. The juvenile stage is dominated by zooplankton, mainly feeding on rotifers, cladoceros and copepods, and also feeding on some green algae and diatoms. After a little bit of growth, eat aquatic insect larvae and leeches. The adult diet has a wide range of diets, including foods such as organic detritus, clams, aquatic insects, and wild fish. Under culture conditions, freshwater sharks feed on organic detritus, plankton, artificial diets, and alfalfa, small junk fish, snail meat, fish meal, and shrimp. Plankton includes diatoms, green algae, rotifers, cladocera and copepods.

Propagated freshwater sharks are sexually mature from 3 to 4 years of age and can bred at a weight of 3 kg or more. Every year from June to September is the breeding season, spawning once a year. Artificial oxytocin can be produced. The eggs are small, sticky, yellow-green, and transparent.

Adaptability to the Environment Freshwater sharks are physically strong and adaptable to the environment. They are stronger than other fishes and have strong resistance to hypoxia, whether they are adaptable or resistant to disease. Its fish gills are auxiliary respiratory organs and have auxiliary breathing functions. They can swim on the surface to inhale the air. When the "Four Homes" is severely floating due to lack of oxygen, the fish can still live normally.

Temperature-appropriate range of temperature-water fish, the ability to resist low temperatures is weak, in the northern region can not naturally winter. In winters in Guangdong, Guangxi, and Hainan, it is best to use greenhouses for winter in order to prevent cold currents. The suitable water temperature for growth is 20°C-33°C. When the water temperature drops to 18°C, it will stop eating and reduce activities. The coma will begin to occur below 14°C, and it will begin to die at 12°C.

Growth habits Freshwater sharks grow mainly within the temperature range of the year and grow rapidly, with a maximum of 27 kg. 150 grams of fingerlings can grow to 1.5kg-2kg. Due to their relatively high prices, they are generally marketed at 1.5kg.

When the growth rate is rich in food, temperature and other ecological factors are suitable, the freshwater shark grows rapidly, and the body weight and body length can increase exponentially. The growth is mainly affected by temperature, food, age, and physiological conditions, etc., and the juvenile fish body. The increase is rapid and the weight gain is relatively slow; when the body length increases to a certain length, the growth rate begins to slow down, while the body weight increases rapidly. Data indicate that freshwater sharks can generally grow at an average rate of 15 grams or more per day from June to October. Two-year-old freshwater sharks can grow to more than 2 kilograms.

Temperature and growth suitable growth water temperature is 20 °C -33 °C, 28 °C -30 °C is the most suitable. Therefore, the growth season is from late April to mid-October, and there is a difference of about 20 days between North and South China.

Feed and growth In the case of artificial feeding, the amount and type of feed will directly affect the growth of freshwater sharks. When the species size, stocking density, and environmental conditions are similar, whether it is individual growth or population yield, it is better to feed concentrated feed than rough-breeding; in particular, a certain amount of animal protein, such as fish meal, cocoon, is contained in the concentrate feed. The mixed feed of powder grows fastest. Therefore, it is feasible to cultivate plankton by artificial fertilization to promote its growth in aquaculture. When the stocking density is high, it must be supplemented with a certain amount of concentrate feed.

Density and growth Like other farmed fish, within a certain range of stocking densities, the lower the stocking density, the greater the individual’s growth and the lower the population’s yield; conversely, the higher the stocking density, the smaller the individual’s growth and the population The higher the yield. Therefore, in the production practice, the key to determining the density of stocking lies in dealing with the contradiction between the size of the individual and the output of the group.

Gender and growth of freshwater sharks have different growth rates due to different genders, and this difference is not significant during fry and young fish. However, once sexually mature and reproductive behavior occurs, it is usually due to the fact that females need to consume large amounts of energy during spawning, spawning, hatching, and nursery care, which seriously affect their growth. Therefore, the growth of male fish is significantly faster than that of female fish, and the disparity increases as the growth continues.

Diseases and prevention and control of aquaculture have proven that freshwater sharks are more sensitive to chemical drugs, so try to avoid using chemicals that are highly irritating and have high side effects during feeding. In the epidemic season of fish disease, regular spillage of drugs containing “chlorine” or the addition of “Allicin” and “Oxytetracycline” to the feed will prevent the occurrence of bacterial or viral diseases. In the fry stage, it is easy to infect parasitic diseases such as small melons and trichotomous worms. If suffering from skin diseases such as skin skin, acne and other skin diseases, 20 ppm formalin can be used to splash the whole body and maintain the efficacy for more than 2 hours.

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