CATDOLL : CATDOLL: Which fish can reproduce naturally in a pond?

1. Which fish can reproduce naturally in a pond?

There are many fish that can reproduce naturally in fish ponds, such as crucian carp, carp, black carp, yellow catfish and so on.

Some fish need a certain amount of water flow to spawn, such as black carp, grass carp, silver carp, and bighead carp. If the water is stagnant, they will not breed small fish. During the breeding period, the water temperature must be controlled well, and oxygen must be added to the water, because the demand for oxygen will increase during the incubation period of fish eggs.

2. What fish can reproduce naturally in ponds?

1. Black carp will reproduce naturally. Black carp lives in the lower layers of rivers and lakes, mainly feeds on mollusks, and its breeding season is from May to July. During breeding, it will lay river-drifting eggs in rivers, and the membrane diameter of the eggs is generally 5-6 mm. In the reproductive season, the male fish has white granular pearl stars on its head, and there are dense pearl stars in the shape of bands on its pectoral fins.

2. Bighead carp will reproduce naturally. This fish likes to live in open water areas on the clear side of lakes.

3. Which freshwater fish reproduces the fastest and is suitable for ponds?

The fastest-breeding freshwater fish suitable for ponds is tilapia. It lays its eggs in mussel shells from April to June. The survival rate of young fish is high. Each fish can lay 200 to 300 eggs. It can reproduce in one year. It has a omnivorous diet and can fill the entire pond in one or two years.

4. Can fish that breed in rivers be raised in ponds?

OK

1. First of all, check whether there are industrial manufacturers upstream and downstream of the river. Because if there are industrial manufacturers upstream and downstream of the river, they will discharge industrial waste into the river. Even if it is treated, it will still cause a certain degree of pollution. Therefore, it is not recommended to set up farms near industrial production plants.

2. Secondly, pay attention to the growth conditions of surrounding farmland. If the farmland is in the prevention or treatment stage of certain pests and diseases, pesticides will be used, and pesticide residues will flow into the river with irrigation discharge. Therefore, it is not recommended to set up farms near farmland.

3. Pumping and drainage should be carried out in rivers in two different basins as much as possible.

4. The farm should set up a reservoir, which should occupy about one tenth of the total breeding area. After the river water is input, 2-5ppm bleaching powder should be sprayed on the whole pond to mix evenly, and the aeration pump should be turned on and turned off after about 24 hours. Wait for the reservoir to settle and the volatilization gas to evaporate for 3-5 days before it can be used for breeding.

5. Finally, observe whether there are any farmers nearby, because some farmers’ ponds are diseased and if the water discharged after spraying pesticides is used, it may cause cross-infection of fish in their own ponds and cause disease.

5. How do the red earthworm-like worms in the pond reproduce?

What you are talking about should be the red nematode, scientifically known as red nematode, commonly known as water earthworm, which belongs to the family of Corymbrillidae of the phylum Annelida. It lives in silt rich in organic matter. The more of these worms there are, the more polluted the water source is. They are an important food source for fish.

The reproduction method is oviparous. The red nematode reaches sexual maturity at around 2 months old. It is hermaphroditic and cross-fertilized. The eggs are enclosed in a sac-like cocoon made of a transparent gelatinous membrane.

Generally, an earthworm cocoon contains 1 to 4 eggs, and up to 7 eggs.

During the reproductive period, each adult can excrete 2 to 6 earthworm cocoons.

When the water temperature is between 22 and 32 degrees Celsius, the incubation period is generally 10 to 15 days, and the lifespan in artificial cultivation is about 3 months.

6. What impact does hydrogen sulfide in ponds have on the growth of freshwater fish?

In aquaculture water, the existence form of hydrogen sulfide is mainly affected by the pH and temperature of the water. Under acidic conditions, non-ionic hydrogen sulfide is the main form, while under alkaline conditions, ionic hydrogen sulfide is the main form.

It is non-ionic hydrogen sulfide that is toxic to aquatic animals. After entering the blood of aquatic animals, non-ionic hydrogen sulfide can combine with the iron in the hemoglobin of aquatic animals, reducing the blood's ability to transport oxygen, causing difficulty in breathing for aquatic animals, and even causing poisoning and death.

At the same time, hydrogen sulfide also has adverse effects on the skin of aquatic animals.

If farmed animals live in water bodies with excessive hydrogen sulfide content for a long time, their growth rate will slow down, their immunity will decline, and they will be more susceptible to disease.

It is generally believed that the non-ionized hydrogen sulfide content in aquaculture water should not be higher than 0.1mg/l, and that in nursery water should not be higher than 0.05mg/l. It is best not to detect it. 2. Judgment of hydrogen sulfide poisoning 1. Fish gills are dark brown, gill covers are tightly closed, and blood is chocolate-colored 2. Often swims on the surface of the water 3. The dissolved oxygen in the water, especially in the bottom layer, is very low 4. Use vinegar or hydrochloric acid to acidify brown blood, and a rotten egg smell of hydrogen sulfide is released 5. The smell of rotten eggs can be smelled downwind 6. The probability of hydrogen sulfide poisoning in hydrogen sulfide test low pressure, rainy weather environment, typhoon weather, stirring of bottom mud, etc. will be much greater! 3. Treatment of excessive hydrogen sulfide in aquaculture pond water There are mainly the following measures to treat excessive hydrogen sulfide in aquaculture water:

1. Maintain an aerobic environment at the bottom of the pond to allow the organic matter at the bottom of the pond to fully decompose under aerobic conditions.

Maintaining an aerobic environment at the bottom of the pond is the main means of preventing high levels of hydrogen sulfide in aquaculture water.

During the breeding process, the breeding water of intensive ponds should not be too deep to facilitate convection between the surface and bottom water bodies; during the aquatic animal breeding cycle, oxidizing bottom modification such as potassium persulfate should be used regularly to increase the redox potential of the pond bottom; if conditions permit, bottom aeration devices can be installed at the bottom of the pond to increase the dissolved oxygen in the bottom water body; silt should be removed in time during breeding intervals to remove organic matter that has not been completely decomposed from the bottom of the pond.

2. Use photosynthetic bacteria and other microbial preparations to remove hydrogen sulfide from water bodies by utilizing the absorption and utilization of hydrogen sulfide by photosynthetic bacteria during the photosynthetic reaction.

Species of photosynthetic bacteria of the Rhodospirillaceae family can use hydrogen sulfide as a hydrogen donor and electron acceptor to carry out photosynthetic reactions in anaerobic environments, but the prerequisite is that there must be a certain amount of light. The light intensity at the bottom of most intensive ponds is relatively weak, and the photosynthetic bacteria proliferate slowly, which affects the removal of hydrogen sulfide from the bottom water of the pond.

3. Use ferrous sulfate and other iron-containing soluble compounds to react iron ions with hydrogen sulfide to form water-insoluble precipitates, thereby achieving the purpose of removing hydrogen sulfide from water. Due to cost considerations, it is less used.

4. Avoid acidification of the bottom sediment and bottom water of aquaculture water to prevent the formation of non-ionic hydrogen sulfide.

5. Avoid water containing a large amount of sulfate ions from entering the aquaculture water body to reduce the source of sulfur in the water body.

7. Can loaches, snails and shrimps be raised together in a pond with water chestnuts?

Water chestnuts can be mixed in ponds. Wild water chestnuts can purify water quality. Wild water chestnuts are part of the natural ecosystem. A moderate amount of wild water chestnuts can purify water quality. Water chestnuts are also planted in other places to repair polluted lakes. However, if the number of water chestnuts is too large, it may have an adverse effect on other aquatic organisms and should be properly controlled. Wuhan Shahu will have the beautiful scenery of "the lotus leaves connecting the sky are endless and green, and the lotus flowers are red in the sun." Recently, a large area of ​​wild water chestnuts appeared in the central waters of Shahu, and together with the lotus leaves, it seemed to put a green coat on Shahu.

8. When raising freshwater fish, which species of fish grows faster and is not easy to reproduce?

Freshwater fish, which grows fast but is not easy to reproduce?

Are you asking about ornamental fish or farmed fish?

For ornamental fish, I recommend medium to large ornamental fish, such as the map fish

The map fish is ferocious by nature, strong, adaptable and grows rapidly.

Generally, the water temperature is above 25 degrees, and it grows fastest. It is recommended to feed small grass carp and mealworms.

Map fish can eat and poop, so the filtration system must be good to keep the water clean!

It is recommended to buy multiple or single map fish. Adding fish halfway will cause them to fight over territory.

It is not recommended to raise fish together. Different species of fish will always fight. It is best to raise one or more fish together from a young age.

This kind of fish is generally not easy to breed. If you don't want to breed, just don't buy female fish.

I also recommend parrot fish, which can be raised in groups, but the temperature must be kept above 26 degrees. Low temperatures and lack of oxygen can easily kill them.

If you are raising fish in a pond, such as koi, if you don't want them to breed, you can raise cleaner fish. They will help you clean the eggs.

9. There are lobsters in the fish pond. How can we eliminate them without harming the fish?

Lobsters must be present in the pond to eliminate them without harming the fish:

1. Artificial capture, using a net, releasing the fish and catching the lobsters.

2. Take advantage of the lobster's tendency to move toward water and capture them in batches at the water inlet of the fish pond.

3. Contact the local aquatic research institute to consult about drugs and other methods. Lobsters have a strong tendency to flow, like fresh water, swim upstream, and like to live in groups. In the breeding pond, they often gather in groups around the water inlet. On rainy days, the shrimps can go against the water flow to the shore for a short stay or escape. When the water environment is not suitable, they will also climb onto the shore to live, so the breeding site must have anti-escape fence facilities.

10. Why do some domestic fish such as grass carp not lay eggs in ordinary ponds? How do they reproduce?

What I know is that grass carp and silver carp must grow to a certain size before they can reach sexual maturity, at least five to six years. Another requirement is that there must be a sufficient amount of water surface to meet the breeding conditions of these two domestic fish. Ordinary domestic fish usually need to be cleared and sold after about two years or even one year, which does not meet the conditions for their reproduction. In addition, even if these fish grow to mature conditions, sometimes they still need artificial aphrodisiac assistance to complete the breeding of domestic fish. Most people probably can't do this.

I hope my answer satisfies you. Thank you for the question in the topic.