CATDOLL : CATDOLL: Techniques for artificially cultivating large numbers of Daphnia, what kind of cell organism is Daphnia?

1. Techniques for artificially cultivating large numbers of Daphnia. What kind of cell organism is Daphnia?

answer

1. Seed source: Seed source is the key to raising Daphnia. Generally, a large number of wild Daphnia collected will die, so they must be domesticated and watered. 2. Food: Daphnia is a filter feeder. The key to raising Daphnia is to raise good food for Daphnia. 3. Temperature: The suitable growth temperature of Daphnia is 18-25°C and the pH value is 7.5-8. Daphnia does not need oxygen during growth.

1. Techniques for artificially cultivating large numbers of Daphnia

1. Seed source

Seed source is very important for breeding Daphnia. Generally, wild Daphnia collected from outside will die in large numbers, so they must be domesticated and watered before breeding, or domesticated seed source should be purchased directly.

2. Food

Daphnia are filter feeders, so you need to first culture their food before breeding. Daphnia's food is mainly bacteria and algae, so you can choose Daphnia feed according to the amount you need.

3. Temperature

The suitable growth temperature of Daphnia is 18-25°C and the pH value is 7.5-8. It does not need oxygen supply during its growth. Daphnia has poor swimming ability and will die due to excessive water surface fluctuations.

4. Notes

The breeding of Daphnia is similar to that of fish, and Daphnia is easier to breed than fish, as long as the water temperature and pH value are appropriate. However, you must be careful when breeding, and you must protect the seed source. If a large number of deaths occur, you need to find new species.

2. What kind of cell is Daphnia?

1. Daphnia are multicellular organisms. Before cultivating Daphnia, you must prepare a container, such as a water tank, with a diameter of about half a meter, so that there is enough space for it to reproduce. The area of ​​the water body must be large, so that the water quality is easy to maintain, and the oxygen content will be relatively high, which will make it more convenient to raise. The water should not be too deep, because the water pressure will be too high, which is not conducive to its survival. Generally, half a meter is enough.

2. Daphnia need sufficient light to grow. If the environment is dark, its reproduction will be affected to a certain extent. Therefore, the breeding container should be placed in a sunny place. At the same time, the water temperature should not rise too quickly. If the water temperature rises, add cold water in time.

3. Daphnia are more suitable to live in nutrient-rich water bodies. The nutrient content of the water body must be high so that it can grow better. You can usually add an appropriate amount of organic matter to the water, such as milk, flour solution, etc., but don't add too much, so as not to deteriorate the water quality and cause a large number of Daphnia to die.

2. What should Daphnia be fed? Yeast, brown sugar, or yogurt?

Just put some soil.

3. What does Hydra eat?

I have collected some information, I hope it will be helpful to you.

Freshwater aquariums are prone to Hydra infection if live worms are frequently fed to fish. Hydra is a coelenterate with strong attachment. It has a thin cylindrical body with many silk-like tentacles on the top. They are small but very resilient and will quickly attach to the glass surface of the entire aquarium and water plants, or any other place where they can attach. They feed on organic particles and sometimes even catch small fish to eat.

Their tentacles release some toxic substances that irritate the fish's skin and cause the fish to rub against their bodies. Even if they are not harmful to the fish, their hairy appearance is unpleasant, so they are regarded as uninvited guests in the fish tank and should be removed as much as possible. Unfortunately, no fish or creature will prey on hydras, and scavengers are also afraid of them, so hydras become a very difficult problem. In fact, it is not too difficult to remove them. Their biggest nemesis is heavy metals, and low doses of heavy metals can make them "annihilate".

A commonly used method is to soak a ball of copper wire in the fish tank of the hydra. After a few days, the hydra will disappear without a trace. This method is safe and reliable and will not cause harm to other aquatic organisms. If your fish tank is infected with hydra, you might as well give it a try.

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Hydra is a small coelenterate that is often brought into the aquarium with fish and insects. It reproduces in large numbers at a water temperature of 22-26°C. It is harmless to adult fish, but a natural enemy to young fish. It competes with fish for oxygen and food in the aquarium. Once found, it is difficult to eradicate. Although hydra is harmful to fish, it can be used as a teaching material for biology experiments for middle and primary school students.

(1) Symptoms: The hydra has a suction cup at the tip and a tentacle mouth at the other end. The suction cup can attach to glass and water plants. The body and tentacles sway in the water, competing for food for fish. The hydra will fill the tank within a few days and easily spread to other fish tanks.

(2) Treatment: The specific drug is copper sulfate. A 90×45×60 (cm) box can be filled with mung bean-sized crystals to kill them, but this is not convenient for boxes with aquatic plants. In the early stage of this situation (when the number is not too large), you can put a few bundles of copper wire, which can kill them in about 3 days. The copper wire can react with the acid radicals in the aquarium to form copper compounds, killing the hydras. After the purpose is achieved, remove the copper wire as soon as possible, as too much copper is toxic to fish.

4. How to store small water bugs for fish for the longest time

You can filter it with a filter, wrap it with plastic wrap, and then freeze it in the refrigerator. Generally, fish worms are stored in the summer and used to feed small fish in autumn and winter. This is the simplest and most convenient way to store fish worms. It can also ensure the quality of the fish worms, and it is also safe to use them to feed small fish. You don’t have to worry about the small fish getting sick. Of course, you have to thaw it when you take it out of the refrigerator to feed the small fish, but you can’t thaw it with hot water. Everything is for the cute baby fish, hehe! ! ! ! ! !