CATDOLL : CATDOLL: How to breed Daphnia?

Waterflea

Daphnia are small insects that live in stagnant water and feed on microorganisms. They swim using strong, forked antennae and are an important food source for fish and other insects.

Water flea (shuizao) (Daphnia) invertebrate, Arthropoda, Crustacea, Branchiopoda, Daphnia family. The length of the water flea is 1 to 3 mm. There are two shell valves outside the body, and there are ridges at the back where they are connected. There are sharp spines (shell spines) extending from the back. The head extends out of the shell, and the snout is obvious and sharp. The compound eyes are large and obvious, and can be rotated continuously. There are simple eyes between the compound eyes and the first antennae. The first antennae under the snout are short and cannot move; the second antennae are well developed with eight or nine swimming bristles. There are 3 to 4 ventral processes on the dorsal side of the abdomen, and the front one is particularly developed and extends to the front. The posterior abdomen is slender and gradually tapers backwards. There are 5 pairs of thoracic limbs, and the tail is claw-shaped. The male is smaller, and the dorsal edge of the shell valve is straight. The snout is short and blunt or absent. The ventral process is degenerate. The first antennae are long, movable, and have long flagella. The first thoracic limb has hooks and flagella. Daphnia uses the bristles on the antennae to move the water flow in the direction When the antennae are raised, the body sinks, as if jumping in the water. In spring and summer, only females can be seen. They reproduce parthenogenetically and produce eggs called "summer eggs". They are smaller, thinner in shell, and less in yolk. They do not need to be fertilized and can directly develop into adults. Most of these adults are females, and then they reproduce parthenogenetically. Therefore, they can reproduce in large numbers in a short period of time and appear red, so they are called red worms. In autumn, some small males hatch from summer eggs and begin to reproduce sexually. The eggs they produce are called "winter eggs". Winter eggs are larger than summer eggs, with thicker shells and more yolk. Fertilized winter eggs, also known as "dormant eggs", survive the severe cold or dry environment and develop into new females in the spring of the following year when the temperature is higher. Except for a few that live in seawater, most of them are the most common zooplankton in various freshwater areas and are excellent bait for fish.

Daphnia refers to two major types of aquatic zooplankton, namely, cladocerans and copepods. They are rich in nutrition, easy to digest, and are a palatable bait for fish fry and fingerlings. Artificial cultivation of Daphnia for feeding fish has low cost, fast fish growth, and good production increase effect. The method is:

1. Build a pond. Either an earthen pond or a cement pond is fine. The pond should be about 1 meter deep and rectangular in size of 10 to 30 square meters.

2. Fill the water tank to a depth of about 50 cm. The suitable water temperature for Daphnia is 18℃～25℃, pH value is 7.5～8, and dissolved oxygen saturation is 70%～120%.

3. Fertilization: For each cubic meter of water in an earthen pond, add 4 kg of cow, horse or other animal manure, 1.5 kg of rice straw, wheat straw or other non-toxic plant stems and leaves as base fertilizer, and apply topdressing once every 10 days, with the same amount of topdressing as base fertilizer. After that, apply topdressing as appropriate according to the water color to keep the water color yellow-brown. For each cubic meter of water in a cement pond, add 1.5 kg of cow, horse or other animal manure, plus 1.5 kg to 2 kg of fertile soil, and apply topdressing once every 8 days, with the amount of cow, horse or other animal manure 0.75 kg.

4. Cultivation Whether it is an earthen pond or a mud pond, yeast and inorganic fertilizer mixed cultivation method can be used. Add 20 grams of yeast per cubic meter of water. The yeast can be soaked in water for 3 to 4 hours before being poured into the pond. Apply 65 grams of ammonium carbonate and 37.5 grams of ammonium nitrate per cubic meter of water. Apply once every 5 days, and the amount is half of the initial amount. After adding yeast, expose the pond water to the sun for 1 to 3 days, and then add Daphnia as seeds. The amount of seeds used is 30 to 50 grams per cubic meter of water.

5. After 15 to 20 days of catching Daphnia seeds in the pond, they will multiply in large numbers and cover the entire pond. At this time, you can catch them in batches to feed the fish. Generally, you can catch them every 1 to 2 days, and catch 10% to 20% of the total amount each time. In an environment where the water temperature is 18℃ to 20℃, you can catch them frequently and continuously.

First, prepare a container. It can be a small tank, pet box, PET bottle, etc. The best suggestion is to use a container with a larger area in contact with air. Because Daphnia will float to the surface of the water and make breathing movements, if there are too many of them, some of them may not be able to compete for a place and die~~~

Light source: Generally, breeders are told that as long as there is light, it will be fine. But...what about at night? Won't they all sink to the bottom? That's right, they sink to the bottom, and most of them die the next day. Why? Because they are too lazy to breathe~~~ So, it is recommended that the light source should not be turned off at night. You can use a small light source (such as a 5w night light, etc.) to avoid this trouble. Of course, some people will say, is it necessary to raise it like this? The answer is not necessarily, but it is necessary to have a large number of them. We don't raise it just for fun, the key is the number of pots, and the number must be enough to feed the fish, right?

Feeding; generally, breeders are told to use yeast powder soaked in water to feed, but if the amount is not well controlled, the water quality will deteriorate quickly, causing the water fleas to die quickly, and then you have to buy water fleas again or ask others for more~~~ So, my method can be considered to prevent this. At the same time, you don’t have to worry too much about buying yeast powder, because sometimes yeast powder is hard to find, or it comes in a big bag and you can’t use it up. Because later I thought, if I soak yeast powder in water and feed them to eat, then can I feed them with any liquid that dissolves in water? The answer is yes, because round water fleas are filter-feeding creatures, so they usually survive by filtering nutrients in the water, because if the things we throw down are soluble in water, they can eat them~ Because, Daxiong tried "sheep blood" (special thanks to Xiaoqiu for his enthusiastic sponsorship) to feed and found that the effect was good. Later, I heard that the reason for using yeast powder is that there are some amino acids in it, and water fleas can eat this. As for amino acids, I can't get them, so I have to use fresh milk~~~ I believe it will also have a good effect..........

Daily care: Actually, you don't need to pay much attention to them. Just give them light and some feeding. As for changing the water, after sucking out the water fleas each time, add the amount of water that was sucked out. If there are too many algae, it's also good to put some apple snails. As for the effect, hey, it depends on you to try it yourself. As for the amount of feeding, don't feed too much at a time. 2~3cc at a time is enough. Don't think it's too little. This is enough and it won't cause the water quality to deteriorate. As for filtering water fleas, this is much easier than filtering brine shrimp. If you don't want to filter, you can use its phototropism. Use light to attract them and then suck them out with a dropper, then wash them with plenty of clean water, and then you can feed them. If you want them to be more nutritious, feed them some nutrient solution before feeding, and feed them to the fish after one to two hours. It's more nutritious this way.

Filter Daphnia. Generally, when we think there are enough Daphnia, we can feed them. Daphnia are phototropic, so when we filter, we can use this characteristic to attract them to the corner, and then use the air duct to suck them out. The Daphnia sucked out are mostly mixed with dirty water from the original Daphnia tank. In order to avoid polluting the fish tank, it is necessary to filter it. You can use a fine mesh net, or a "biological filter (300 mesh)" bought from a chemical material store to filter. After filtering, soak it in clean water, or add some ingredients (milk, vitamins, etc.) and then indirectly let the fish eat these things.

Collection and cultivation of Daphnia

After collecting Daphnia from the river, they should be placed in a larger glass tank. Some water brought back from the river and green algae, such as Spirogyra, should be placed in the tank to increase the oxygen in the water. Some minced meat made from earthworms, locusts or other animals should also be placed as bait for Daphnia. When the number of Daphnia increases, they should be collected in time and dried. In late autumn and winter, the reproduction capacity of Daphnia is greatly weakened. In winter, when Daphnia are not seen in the water tank, do not pour out the water in the tank, because they are all lurking in the green algae. We can put the water tank in a sunny room or near the radiator. In spring, when the indoor temperature rises, Daphnia come out to move again. When the room temperature rises above 28℃, Daphnia begin to reproduce in large numbers. Daphnia can be used to raise hydra for teaching.

Daphnia

Farming technology

Friday, May 18, 2007 17:34 After getting the Daphnia grana, open the bag to ventilate. Prepare a large container of 10 gallons (about 40 liters of water) to culture Daphnia.

Water Quality

It is extremely important to treat water like your fish.

Water

Metal and

Toxic substances

After you have prepared a large container filled with water, place the bag of Daphnia in the

In the water

, let it

water surface

Float for 20 minutes. The container for breeding Daphnia needs 16 hours of sufficient light and good ventilation every day, and the ideal temperature is 21-27 degrees Celsius. Feed Daphnia: Mix equal amounts of potato flakes, fish food flakes and

yeast

Crush into powder. Dissolve one-quarter teaspoon (about the amount needed for a 10-gallon aquarium) of the powder in water and pour the water into the Daphnia aquarium. Do not add more to the aquarium until the water is crystal clear.

feed

You can also feed Daphnia with yeast, common

Baker's Yeast

That's it. Dissolve the yeast in the right amount of water (be careful to add the right amount of yeast, otherwise it will cause oxygen deprivation for the Daphnia), and pour the water with dissolved yeast into the Daphnia breeding tank. The water will become a little dark, and there is no need to add feed to the breeding tank until the water returns to crystal clear. Change the water: Change the water once or twice a week, and change 25% of the water in the Daphnia breeding tank each time. Make sure the water you add does not contain chlorine and is the same temperature as the water in the breeding tank.

Add water plants after oxygenation