CATDOLL : CATDOLL: Fish density issues

Fish density issues

The polyculture ratio and density of various fish can be determined based on the supply of fertilizers and baits, polyculture mode, pond conditions and fish species specifications.

In traditional fish farming, the ratio of "water-rich fish" to "food fish" is 6:4; the use of compound feeds can increase the number of "food fish" in mixed culture, and the ratio is generally 4:6. Grass carp is used as the main body to mix silver carp and bighead carp, and the mixed culture ratio is 2:1 or 2:2; grass carp and bighead bream are used as the main body to mix silver carp and bighead carp, and the ratio of grass carp to bighead bream is 1:3 or 1:4, the ratio of grass carp, bighead bream to silver carp and bighead carp is 1:1, and the ratio of silver carp to bighead carp is 4:1 or 5:1 at any time. Among them, the allowable amount of grass carp is 10-15 kg per square meter of water surface; the allowable amount of silver carp is 20-30 kg per 100 square meters of water surface; the maximum allowable amount of bighead carp is 4.5-6.0 kg per 100 square meters of water surface. The ratio of carp as the main fish to other fish is 6:4 or 7:3, and the allowable amount of carp is 90 to 180 per 100 square meters of water. Because carp is very competitive, in ponds where grass carp is the main fish, the carp should be controlled at 25 grams per carp, and the number should not exceed 15 per 100 square meters of water surface. In ponds where black carp is the main fish, the number of bream is generally 30 per 100 square meters of water surface. With crucian carp as the main fish, the allowable amount is 150 to 220; no matter which fish is the main fish, if silver crucian carp and white crucian carp are mixed and raised, the number of white crucian carp with a size of 40 to 50 grams per carp is 30 to 45 per 100 square meters of water surface, and the number of silver crucian carp with a size of 15 to 20 grams per carp is 60 to 90 per 100 square meters of water surface. In addition, tilapia is a good matching fish species. It is a wintering fish species weighing 5 to 10 grams, and the matching number is generally 45 to 75 per 100 square meters of water surface.

3. Polyculture model

At present, there are mainly the following polyculture modes in pond fish farming in my country:

1. The polyculture model with herbivorous fish as the main fish is to feed herbivorous fish with grass, use the feces of grass carp and bream to fertilize the water, and raise silver carp, bighead carp, etc. This polyculture model is mainly based on aquatic plants and planted green bait, and some fine bait can be added in appropriate amounts. Since the source of bait is easier to solve, the output and economic benefits are better, this polyculture model is more common in my country.

2. The polyculture model with filter-feeding fish as the main fish is to take silver carp and bighead carp as the main fish, and appropriately mix other fish, especially fish with strong ability to feed on bait debris, such as non-carp and silver carp. This model is mainly based on fertilization, and grass is also fed. Due to the wide source of fertilizer and low cost, this model is the main model for pond fish farming in many areas of my country.

3. The polyculture model with omnivorous fish as the main fish is based on carp or crucian carp. The former is more common in the north, and the latter is more common in the south. The culture type with carp as the main fish is mainly concentrated feed, and the culture cost is relatively high; the culture type with crucian carp as the main fish is mainly fertilized, and the culture cost is relatively low.

4. Polyculture model with carnivorous fish as the main fish. The main fish in this polyculture model is black carp. Due to the limited natural resources of snails and clams, and the lack of black carp pellet bait, this farming model is not common.

4. Stocking density

(1) Stocking density of commercial fish: The growth rate and perfect body shape of goldfish are not only related to water quality and bait, but also to the number of goldfish raised per unit area. The lower the stocking density, the better the development of goldfish and the most perfect body curve. The higher the stocking density, the smaller the goldfish, the thinner the body, the malnourished, the less beautiful the appearance, and the lower the ornamental value.

Table 1. Goldfish stocking density from May to November (fish/square meter)

Fish length (CM) Commercial fish density (tail) Breeding fish density (tail)

2-3 200-250 100-150

4-6 100-150 50-80 [ocCM

7-9 50-100 30-40 d~LW

10-12 20-30 10-15 @{Sd3

13-15 10-15 5-8 _5 PKe

(2) Stocking density in home aquariums: When raising ornamental fish in a home aquarium, do not keep too many of them.

Table 2. Stocking density of ornamental fish in aquarium (120*50*45) (fish/square meter)

Monthly fish length (CM) Stocking density (tails)

4-5 7-9 6-8

6-9 7-9 5-7

10-12 10-12 4-6

1-3 10-12 7-8

Because the rectangular aquarium for domestic use is small in size, it is not advisable to raise too many fish. It is better to raise less rather than more. For example, in a container with a length of 40 cm, a width of 25 cm, and a height of 30 cm, 6 to 8 small goldfish of 5 to 7 cm in length can be raised. For example, in a round glass tank with a diameter of 26 cm and a height of 13 cm, 4 to 6 small goldfish of 4 to 6 cm in length can be raised. Adult fish with a body length of more than 8 cm should not be raised in a small glass tank, but should be raised in a large glass tank or a ceramic tank, and equipped with a small oxygenator to prevent hypoxia. These stocking densities are only reference numbers, and they should be determined by the water temperature, the strength of the fish, and the quality of the water. They cannot be mechanical. Generally speaking, the larger the fish, the fewer the number of fish to be raised; raise more in winter and less in summer; raise more when the water temperature is low and raise less when the water temperature is high. If you master the above points when raising goldfish at home, you will be able to keep them healthy and lively, colorful, swimming in the water, and being loved by people, so that you will never get tired of watching them and have endless fun. You will definitely be able to raise them well, and I wish you success.

12.31

If you don't grow grass, you can grow five 10-centimeter fish~

When raising fish, you should raise single fish instead of double fish, and raise double fish instead of quad fish. Although this saying refers to dragon fish, I have always raised them according to this~

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If you are a novice, you must raise the fish in a diluted state. If there is too much muddy water, you must keep filtering!

Can a 800*340*540 tank be used to raise dragon fish? How much does a 20cm silver dragon cost?

You can temporarily keep one or two 18-20 cm silver arowana, but silver arowana have strong appetite and can grow up quickly, so your tank cannot accommodate arowana. In addition, arowanas in a small tank are prone to eye and tail loss, not eating, and slow growth. Generally, the price of a 20 cm arowana varies from place to place! Generally, it is between 180-230!