How to divide black manta rays between male and female, and how to raise black manta rays?

1. Water temperature. The water temperature of the black feather fish should be between 23 and 28, and the growth temperature should be 25. The suitable water temperature for juveniles should be between 26-28, and the width of the hole should not exceed 4 during the day and night, otherwise it will affect the survival and growth of juveniles. The water temperature should be kept constant during reproduction, which is more conducive to broodstock production, egg hatching and juvenile growth.

2. Oxygen. The oxygen needed for the growth of the black feather fish is carried out by absorbing the dissolved oxygen in the water through the microvessels in the gills, and then carrying it to all parts of the fish through blood circulation. The carbon dioxide they excrete is also carried out through the microvessels of their gills.

The amount of dissolved oxygen in the water is an important indicator of the growth ring of the black feather fish.

If there is less dissolved oxygen in the water, the black feather fish will float to the surface of the water and the phenomenon of "floating head" will occur; If there is a severe lack of dissolved oxygen in the water, the black feather fish will die due to room rest.

The stocking density of fish is the key issue of whether dissolved oxygen is sufficient, if there is more water and less fish, dissolved oxygen is sufficient, and vice versa, hypoxia will occur. This is not absolute, it depends on other factors. The stocking density of black feather fish should be determined according to the specific situation of each tank.

3. Light. Light is also very important for black featherfish. Light is the most important factor in photosynthesis of all plants.

Without light, aquatic plants can not carry out photosynthesis, but there is a certain limit, too strong light, the branches and leaves of aquatic plants will grow green moss, affecting the photosynthesis of aquatic plants, but the light is too weak or the light time is too short, the branches and leaves of aquatic plants will be yellow and even dead due to too little photosynthesis.

If you set up a fish tank in a room with no sunlight, you should use a light to irradiate aquatic plants, and use a 60-watt incandescent bulb or a 40-watt fluorescent lamp for six hours a day.

If there is no light or the light is too weak, we will not be able to see the scenery in the fish tank, and it will also affect the ornamentation, but the black devil likes a dark environment, so we should take measures such as increasing the planting density of aquatic plants and placing sunken trees under the water to create a comfortable living environment for it.

Fourth, bait feeding.

Some fish lovers often die because they love fish and feed them a variety of excessive bait. As everyone knows, fish are not easy to starve to death and are prone to swelling to death, or fish death due to excessive bait causing water quality to deteriorate. Therefore, bait must follow the four principles of timing, fixed-point, qualitative and quantitative.

General compound feed is available daily from 9:00 a.m. to 10:00 a.m. and 4:00 p.m

00-5:00 Two feedings are more appropriate. Feeding live bait such as fish insects can be done at one time in the morning, and for larvae, it is necessary to ensure that there are rotifers, paramecium or egg yolks and other open bait in the tank.

Note that when feeding the earthworms, they should be suspended in the water in a perforated plastic box so that the fish can eat freely. If you are fed other chopped animal bait, it is better to put people to hang the blue and feed it inside; The bait should be fixed so that the fish can concentrate on feeding to reduce waste; The bait must be fresh and free of spoilage; The amount of feed is sufficient to meet the nutrients required for the growth of fish without excess.