Can the smelly scavenger fish be eaten? How can I kill him? What's the harm?

The scavenger is also called sucker fish and sucking catfish, and the scientific name is catfish. He likes to eat the residual bait and dirt of the aquarium. Many friends will ask Dolph that fish can still be eaten when they grow up on dirt. How can I kill him? What's the harm?

Can the scavenger fish eat?

Scavenger fish is an edible fish that is not poisonous. But in fact, exoskeleton fish, exoskeleton hard, more bones, less meat, and low nutritional value, and because of eating dirty food, it has more bacteria in the abdomen, smelly, so generally not recommended to eat.

Second, how can the scavenger fish be killed?

The scavenger fish has no natural enemies, so he doesn't know what to do with it yet.

Third, what is the harm of the scavenger fish

The street sweeper was introduced into China through ornamental fish. Because of its easy breeding, low breeding cost and simple management, it is quickly welcomed. However, after release, because there are no natural enemies in our country, they begin to propagate rapidly and in large numbers. It likes to eat other fish eggs, can eat 3000-5000 fish eggs a day, leading to the extinction of other fish, in some areas of our south has been rampant, is one of the invasive species. So we must not set free in breeding, and it is not recommended to eat, because its meat is really not delicious.

Scavenger fish should never be mixed with mild or small fish. If it propagates in large numbers, it will engulf other fish eggs and lead to the extinction of other fish. There are no natural enemies in China, so be cautious. Can not be released, some parts of the south of this fish has been flooded, resulting in the whole river native fish extinction!

IV. Scavengers' breeding techniques

According to the biological principle, raising an appropriate amount of scavengers in the main culture ponds of koi or Penaeus vannamei can not only purify the water quality, but also increase the yield per unit area of culture and increase the fishery yield and fishermen's income. The practice shows that the effect of raising scavengers in brocade carp ponds is better, especially in brocade carp breeding ponds. The specific practices of raising scavengers in Kam Lei Tong are briefly described as follows:

1. Pond requirements

The area of the fish pond for breeding koi should not be too large, the water surface of each pond should be 3 mu, the depth of the pond is about 2 meters, the bottom of the pond is relatively flat and less silt, the slope of the pond is 1 ∶ (2-2.5), the fish pond is long from east to west and wide from north to south, showing a rectangle, supporting the inlet and drainage system, abundant water sources and fresh water quality.

2. Seedling stocking

Brocade carp adult fish ponds raise scavengers, generally release brocade carp species around the Spring Festival every year, specifications of 20 million 60 carp / kg of brocade carp, 10,000 million per mu of water. In late May, 4000 ~ 6000 scavengers were raised on the water surface per mu, 150 silver carp with a tail weight of 0.1 kg and 20 silver carp with a tail weight of 0.05 kg were raised per mu, so as to achieve the purpose of comprehensive utilization of fish ponds. In the brocade carp breeding ponds, 20000-30000 brocade carp fire flakes per mu of water were raised in late May, and 3000-4000 fire flakes per mu were raised in mid-late June.

The pond must be cleaned and disinfected before the fish pond is released. The method of clearing the pond with dry water is usually used, that is, the pond water is pumped out, and 150 kg of quicklime or 5 kg of strong chlorine or 3 kg of high efficient pond cleaning are used on each mu of water surface to disinfect the whole pond, in order to completely kill the enemy organisms in the water. After 4-7 days, after the drug toxicity disappeared, fresh water was added and the water level was controlled at about 1 meter. In addition, according to the nature of the pond and the thickness of the silt at the bottom of the pond, 300 kg of organic fertilizer was used to cultivate water quality, and the transparency of the water body was kept at 0.2-0.3 m, that is, stocking. It should be noted that the inlet must be filtered with 60-80 mesh sieve silk to prevent wild miscellaneous fish from mixing back into the pond and affect the survival rate of seedlings.

3. Feeding management

As the scavenger mainly eats the residual bait, debris and fish feces in the pond, the feed delivery mainly considers the growth needs of koi. If brocade carp raise scavengers in fish ponds, according to the changes of weather and water temperature, they will start eating once a day, the daily feeding amount will be controlled at about 2%, and the daily feeding amount will reach 3% to 4% since June. the feed is placed on one side of the fish pond, that is, on the south or north ridge of the fish pond, a feeding machine can be installed under conditions to expand the feeding area and facilitate the uniform feeding of fish. To meet the requirements of neat listing specifications. If a scavenger is raised in the brocade carp breeding pond, that is, feeding is carried out on the second day of brocade carp breeding, once a day, and the daily feeding amount is controlled at 2% and 5%. Feed input to achieve four fixed, that is, timing, positioning, quality, quantitative. Timing: refers to the time of feeding is relatively fixed, once a day, usually around 8: 00 in the morning; positioning: refers to the relative determination of the location of feed, that is, feeding in the same place every day, should not be changed at will Quality: the feed used now is pellet feed, the protein content of seedling feed is about 26%, and that of adult fish feed is about 24%. There is no deterioration or mildew in the feed. Quantitative: it means that the amount of feed put in every day is relatively stable, and the specific amount of feed is based on the comprehensive consideration of many factors, such as the size of the fish and the activity of the fish, weather change, water quality and so on. Under normal circumstances, it is put once a day. Make sure you finish the feed within 2 hours. If you can't finish it within 2 hours, reduce the amount of feed the next day to ensure that the fish are full and eat well, without wasting feed and improving feed utilization.

4. Water quality management

Koi has low requirements for dissolved oxygen in water, and the yield of cultured freshwater fish is lower than that of conventional freshwater fish, so water quality management is relatively simple. After stocking, add or change water every 7-10 days, 0.2-0.3 meters each time, and the transparency of adult fish ponds should be controlled at 0.3-0.4 meters. Before May and after October, the water quality can be slightly thicker, and the water quality from May to October can be slightly lighter, which is more conducive to the growth of fish. The transparency of water quality in fish ponds is controlled at 0.2 to 0.3 meters in order to cultivate natural bait in the water and create a good ecological environment for the healthy growth of fish.

5. Prevention and treatment of fish diseases

Brocade carp adult fish ponds, in mid-April and mid-September, that is, before and after the solar terms of Ching Ming Festival and White Dew, use strong chlorohydrin or mixed special safety pool sprinkling once, can also use bromochlorohydantoin or mixed star or strong insecticide and other fishery drugs to sprinkle in the whole pond to achieve the preventive effect. In the high temperature season, mix an appropriate amount of detoxification powder into the pellet feed, with 2-3 courses of treatment, a week as a course of treatment. The main thing is to do a good job of prevention. Brocade carp breeding pond, in mid-September, that is, before and after White Dew solar terms, the use of strong chloride or mixed teran for disease prevention.