The larvae of non-blood-sucking mosquitoes of the genus Culicidae of the species Chaoborus are commonly called the worm. They are widespread everywhere: in deep-water lakes, swamps, forest pools.
These are predators that swim in the upper and middle layers of the water and almost never sink to the bottom.
Coretra – the perfect food for aquarium fish
Koretra is an excellent live food for aquarium fish, which, if properly stored, does not lose its nutritional qualities. You can easily buy it at the pet store, get it yourself or grow it in a garden plot.
The larva has a translucent spindle-shaped body with a length of 12 to 20 millimeters, which consists of 13−14 segments. The color of the body varies from pale yellow to dirty brown.
It depends on the food that the animal finds in the pond. The larva has a clearly distinguishable head with strong bucket jaws and two black eyes-points.
On the tail there is a plumage of several hairs.
On the body of the corret are swimming bubbles filled with gases. They allow her to swim in the upper layers of the water and not sink to the bottom.
It moves with the help of sharp bends of the body, helping itself with a tail fin.
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Coretra differs from moth in that it does not accumulate in one place, but floats in flocks. This is a predator that eats live food. Coretra catches Daphnia, cyclops, other larvae and even newly hatched fry of fish.
In the state of the larvae, it is in autumn, winter and spring. When the summer comes, the corret pupates. The pupa is located near the surface of the water and sinks to the bottom in a disturbed state.
After 12 days, a mosquito appears from it.
Larvae are caught in the fall, winter or spring. In the summer, they are not harvested, as you can catch pupae, from which mosquitoes will quickly emerge in an aquarium.
It is best to catch the rim in a shallow clean pond.
For fishing use a large net with a fine synthetic mesh. It is shallowly submerged under water and produces movements resembling an elongated figure eight. A light whirlpool forms, which draws the larvae into the net.
After the net is filled with larvae, the catch is shaken out into a wide enameled container and filled with a small layer of water.
Koretru not caught in the summer, as a high probability of catching pupae
Larvae can be easily diluted at the cottage or on the household plot. For breeding a corret, you need a pond or a large water tank.
The initial introduction of biomass is not required, the larvae themselves will be bred in still water. Their number will depend on the size of the reservoir.
The advantage of Cortetra fish food is that it is the safest in relation to infectious diseases. The larvae are much cleaner than the laborer and the bloodworms, as they do not sink to the bottom and feed on live food.
If, nevertheless, there are doubts about the purity of the caught coretre, then for disinfection, it must be held in a weak solution of potassium permanganate for 1-2 days.
Coret food is the safest for aquarium fish
To prevent pupation and spoilage of the corret, it is stored at a low temperature. Storage is done in several ways:
- in wet paper or cloth;
- in water;
Larvae purchased in small quantities on the market can be stored by the first method. To do this, they are wrapped in moistened paper or cloth, then placed on the bottom shelf of the refrigerator. The billet should be rinsed daily under running water.
Thus, the corelet is kept fresh for 1-2 weeks.
The chopper should be stored at low temperatures.
To store the larvae in water will require a large capacity and additional space in the refrigerator. For one tablespoon of corret you need half a liter of water.
If the volume is less, then need additional aeration. The water in the tank is changed once or twice a day.
Dishes with larvae also put on the bottom shelf of the refrigerator.
If you have caught a large number of the corret and want to keep it for a long time, then the larvae can be frozen. To do this, they are disinfected and remove excess water.
Then the food is laid out on half of a piece of clean cloth, and the other part is closed on top. The resulting package is placed in the freezer and frozen at -18 ° C.
It is advisable to freeze in small portions in order not to thaw the entire reservoir for each feeding.
The ideal size of the convolution should be such that it can be used for 1-2 weeks. Frozen biomass can be stored for up to a year.
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