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Water spider is a kind of name for "water fleas" in Guangdong, which refers to zooplankton such as rotifers and water fleas, but the so-called "water spider" mainly refers to water fleas. Water fleas, also known as "fish worms" by aquarium players, not only have high protein content, but also contain amino acids, vitamins and calcium necessary for fish, and water fleas are high-quality bait for freshwater reared fish, which has good breeding value. When the water spray seedlings, the rotifers are the best open bait, and when the water spray seedlings go down to the pond for ten days, the water fleas are the most suitable natural food for the seedlings. Different types of fry have different needs for zooplankton, in general, in the fry opening stage, the more adequate zooplankton feeding, the better the fry opening, the more conducive to the increase in the number of cultured. Therefore, the cultivation of water fleas is crucial for water blooming seedlings.
(Hydra under the microscope)
First, the biological habits of water fleas
The dormant eggs of water fleas have strong vitality, can safely overwinter at minus 30–40 degrees, and are not afraid of drought, high temperatures and lack of water. The breeding speed of water fleas is amazing, it can be said that it is a replication breeding method, water fleas do not need to mate directly to produce small water fleas, it is said that the water temperature is not suitable for food shortage will give birth to male water fleas, just born water fleas can mature and reproduce in 2 days, can be multiplied in large quantities within a few days, and often fishing.
(Fishing for harvested water fleas)
Observed under a microscope, water fleas are clade. The size of the branches is 0.2-3 mm, most species live in freshwater water bodies, suitable for growth and reproduction at water temperatures of 15-25 ° C, mainly feeding on bacteria, yeast, monocytic algae and organic detritus.
There are two modes of reproduction, namely parthenogenesis (parthenogenesis) and hermaphroditic reproduction. When the conditions are suitable, that is, when the water temperature is high and the food is abundant, the branches reproduce in the form of parthenogenesis, which reproduces quickly and can form a large biological population in a short period of time. When environmental conditions are harsh or change drastically, the branches produce male and female individuals in a sexually reproductive manner, and the population rapidly decreases. Therefore, in the cultivation of artificial flea, how to ensure that the bait in the breeding pond is sufficient, the water quality is stable, and the dissolved oxygen is sufficient is the key to the stable and high yield of the water fleas.
Water fleas are commonly found in freshwater bodies, so as long as there is a certain degree of fertility in the water, there is a source of water flea species. Flea swim very poorly, and excessive water surface fluctuations can make it impossible for flea to forage and die. Water fleas are filter food animals, the key to raising good water fleas is to raise food, bacteria and algae of water fleas first, we can choose the feed of water fleas according to the size of our own needs. The traditional cultivation method of water fleas is to sprinkle chicken manure and other livestock and poultry manure, urea and phosphate fertilizer to enrich the water to promote the breeding and growth of water fleas.
Second, high-yield flea cultivation method
1. Clear ponds, filter water, remove wild and miscellaneous fish---- create a good environment for flea breeding
Drain the pond water, clean the pond disinfection, properly dry the pond, apply fertilizer and manure bottom fertilizer, choose sunny and warm weather to cultivate water fleas, the water temperature is more than 15 ° C is appropriate, you can use 80 mesh silk mesh to filter the water.
2. Topdressing, fattening---- promote the rapid breeding of water fleas, large, large and strong
Generally speaking, according to the above method into the water for about 3 to 5 days, a certain amount of water fleas will appear in the fish pond, waiting for the appearance of water fleas, you can apply fertilizer and manure topdressing, and give small water fleas a suitable bait. The abundance of flea food in ponds directly determines the majority of flea production.
3. Water inlet, regular fertilizer replenishment---- promote the continuous breeding of water spiders
It can enter the water for 10-30 minutes a day, which can introduce flea species from the external source water body into the pond, and can also improve the water quality of the pond to facilitate the hatching of flea eggs in the sediment. Fertilization can be made every 5 days, thus continuously promoting the breeding of water fleas.
4. Daily management---- pay attention to oxygenation
Generally speaking, according to the above method of water intake for 10 to 13 days, a large number of water fleas will appear in the pond, the water color is white and turbid, and it is necessary to open an aerator to prevent the pond from having low dissolved oxygen and avoid the flea from entering sexual reproduction.
5. Salvage ---- control time and attention interval
(1) Time to salvage water fleas: you can use a flashlight or bright night to observe the size and number of water fleas, when it is found that the individual water fleas are larger and red, the number is larger, you can start salvaging. The time to catch fleas in a day should not exceed 4 hours, during the salvage of faizi, it is necessary to apply topdressing once every three or four days, if the yield of daphnia drops too much, then stop for a few days and then continue to salvage.
(2) The method of salvaging water fleas: make the filter into a triangle, and then add a net pocket (for collecting water fleas), inserted behind the water wheel aerator, and also increase the light on the eyelid to attract water fleas over. At night illumination, siphon with a water pipe can also be used.
Third, the key point of water flea cultivation
1. Introduction: The number of flea eggs contained in the sediment of different ponds is different, and some ponds can observe more fleas in four or five days; some ponds can observe more fleas after 4 days of water intake, and it is difficult to find water fleas by putting fresh fleas into the pond or continuing to enter new water every day.
(Small fish eating faiths)
2, choose the right time to salvage flea, control the amount of flea salvaged on the day, only in this way can maintain a reasonable flea population in the pond, generally after ten days into the water to start salvage, at this time the number of flea is larger, larger.
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