CATDOLL : CATDOLL: How many angelfish can be raised in an ordinary 800X400X500 (length x width x height)?

1. How many angelfish can be raised in an ordinary 800X400X500 (length x width x height)?

The breeding density of angelfish should not be too high. The recommended breeding density for your tank size is about 100 fry. Excluding the loss, because it is related to water quality, not all of them will survive, so it is about 60-70.

I'm talking about my own experience and it's all theoretically feasible.

The higher the density of fish farming, the higher the probability of disease transmission.

I have a 900, 450, 450 tank. I have 10 pairs of swallow fish, 6 pairs of fairy mice, 5 pairs of chocolate dolls, and 40 pairs of lotus lanterns.

2. >>Technical List Page>>How do aquaculture farmers identify the quality of fish fry when purchasing them?

When buying fish fry, you must first carefully investigate whether the broodstock used by the fry breeding unit meets the national aquaculture standards. The broodstock cultivated by inbreeding are small and the fry produced by the broodstock that matured for the first time are all bad fry. The quality of fish fry can be identified from the following aspects.

1. Visually observe that more than 95% of the fry should meet the developmental stages in the fry concept.

2. They swim in clusters and move actively. When the water in the container is slightly stirred, more than 95% of the fry are able to push the water.

3. Countable indicators: The deformity rate of black carp should be less than 5%, that of other fish fry should be less than 3%, and the injury rate should be less than 1%.

4. For more than 95% of the fry, the weight of black carp should reach 0.8, that of grass carp should reach 0.7, that of silver carp should reach 0.8, that of bighead carp should reach 0.9 and that of bighead carp should reach above 0.5.

3. Fish fry quality identification skills

Most of the fry currently sold on the market are artificially bred. Due to the influence of the quality of the fish eggs and the hatching environment, the fry have different physical qualities, which directly affects their survival and growth and development in the later stage. Therefore, when purchasing, farmers can distinguish the quality of the fry based on their appearance, swimming ability, reaction ability, etc.:

Appearance

High-quality fry have uniform size and uniform body color; the fish body is clean and shiny, slightly yellowish or slightly red; the body is strong and smooth without dragging mud. Low-quality fry have uneven size and different pigments, such as "colorful fry" or dead fry with white color; the fish body is dull, thin and stained with mud.

Swimming ability

Stir the container of fish to create a whirlpool, or blow wind towards the water surface, and you will find that high-quality fish fry can swim along the edge against the current or against the wind, while low-quality fish fry will be caught in the whirlpool and drift with the current.

Responsiveness

Insert an object into the container of fish. High-quality fry will quickly run away when disturbed, while low-quality fry will react slowly. Alternatively, you can pour out the water in the basin and observe that high-quality fry will struggle vigorously, bounce vigorously, and bend their heads and tails into a circle, while low-quality fry will stick to the bottom of the basin, unable to struggle, and only tremble their heads and tails.

In addition, there are several types of fry that need to be noted and should not be purchased, namely, variegated fry, "bearded" fry, "trapped flower" fry and deformed fry. Among them, variegated fry are fry with a mixture of old and young fry, "bearded" fry are fry that have grown to a suitable stage but have not been sold, "trapped flower" fry refer to fry with pectoral fins appearing but the bladder has not yet been inflated, and cannot swim up and down freely and swallow food, and deformed fry are fry that have deformities during growth and development.