MySheen

Matters needing attention in Freshwater Shark Culture in North China

Published: 2024-11-24 Author: mysheen
Last Updated: 2024/11/24, Freshwater sharks are mainly distributed in Southeast Asia. According to body color, freshwater sharks can be divided into four types: black shark, white shark, gray shark and red shark. The sharks of the first three body colors are mostly raised as edible fish, with gray sharks growing the fastest, and red sharks also known as crystal Pattinus. In the juvenile stage, they are mostly raised as ornamental fish. The freshwater shark is a tropical fish with an optimum growth temperature of 20 ℃ and an optimum water temperature of 22 ℃. The freshwater shark has a weak tolerance to low temperature. When the water temperature drops below 18 ℃, the food intake and activity of the fish decrease obviously, and the water temperature decreases obviously.

Freshwater sharks are mainly distributed in Southeast Asia. According to body color, freshwater sharks can be divided into four types: black shark, white shark, gray shark and red shark. The sharks of the first three body colors are mostly raised as edible fish, with gray sharks growing the fastest, and red sharks also known as crystal Pattinus. In the juvenile stage, they are mostly raised as ornamental fish.

The freshwater shark is a tropical fish with a suitable growth temperature of 20-30 ℃ and an optimum water temperature of 22-28 ℃. The freshwater shark has a weak tolerance to low temperature. When the water temperature dropped below 18 ℃, the fish's food intake and activity decreased obviously. When the water temperature dropped to 15 ℃, it almost stopped feeding and began to die when the water temperature was below 12 ℃. The feeding habits of freshwater sharks are omnivorous, juvenile fish take zooplankton as bait, and adult fish can feed on aquatic plants and artificial food.

Liaoning Freshwater Fisheries Research Institute introduced gray shark and red shark species from Hainan in 2003 for domestication and rearing. After two years of breeding and observation, some problems needing attention in the breeding of freshwater sharks in the north were summarized. As follows:

1. Determination of culture season

Because freshwater sharks belong to tropical fish, which determines that they can only be farmed in summer in the north, and other seasons are not suitable for the growth of freshwater sharks. If winter conservation is to be carried out, there must be a greenhouse with hot water resources or heating measures, but corresponding to the increase in breeding costs.

2. Production operation process specification

Freshwater sharks are timid by nature, easy to be frightened, and their body surface is smooth and scaleless, which requires light handling and careful operation in the daily fishing and transport process to prevent fish injuries. If it is found that there are abrasions on the body surface of the fish, the fish should be given medicine and anti-inflammation in time to prevent the disease.

3. Requirements of overwintering pool

If it is necessary for freshwater sharks to survive the winter, in view of their large size and fast growth, give it a relatively large water space with a water depth of more than 1 meter, so as to prevent it from being frightened and swimming wildly, thus hitting the wall and injuring and causing death.

4. @ # @ 136 questions

Due to the restriction of temperature conditions, the unfavorable realistic situation of freshwater sharks concentrated out of the pond for listing is determined. If the market market is not smooth and cannot be sold in a relatively short time, it is easy to cause economic losses to farmers. This requires farmers to investigate the market situation in advance and contact good sales channels to ensure that all freshwater turtle fish out of the pond are sold before they leave the pond in mid-early October.

5. the problem of drug use in the process of culture.

Freshwater sharks are smooth and scaleless and sensitive to chemical drugs, so in the process of feeding, try to avoid using drugs that are more irritating to fish. It is best to use Chinese herbal medicine to prevent and treat it.

 
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