Loach breeding and seed breeding techniques

Loach is a widely distributed freshwater economic fish. It has strong adaptability to the environment, a wide range of feed sources, and is easy to manage. It is easy to breed and can be raised in ponds, potholes, and paddy fields. It is a gateway to family development in rural areas.
Loach is a benthic small fish that matures at age 2 and begins to lay eggs. The mature female has a large abdomen with a round pectoral fin, and the individual is larger than the male. Muddy reproductive period is generally from April to August, when the water temperature is about 25°C in mid-May to late-June, it is the peak of spawning. Loach spawning in batches, used as breeding broodstock, to choose the normal color, physical fitness, disease-free and injury-free, females should choose the body length of 15cm or more, weight of more than 30g abdominal distension individuals, males can be slightly smaller . Individual large females have large amounts of eggs, and there are more males and females. The breeding seeds are of good quality and grow fast.
Loach natural breeding method is simple. After the spring, trimmed the fish pond, disinfected with quicklime, and then inject new water. After the medicinal properties of the pool disappeared, the broodstock was placed in the pool at a ratio of 1:2 for male and female, and about 300 g per m2 was placed. When the pool temperature rises to 20°C, a fish nest made of brown chips, willow twigs, or aquatic plants is placed in the pool. After placing the fish nests, check and clean the sludge deposits frequently to avoid affecting the adhesion of the eggs when the eggs are laid. The loach likes to lay eggs in thunderstorm days or when the water temperature suddenly rises. Spawning starts at about 10 o'clock in the morning and ends in the morning. Spawning takes 20-30 minutes. At the time of spawning, the broodstock chased fiercely, and at the peak, the male slapped around the female's anterior abdominal position to complete the spawning and fertilization process. After spawning, it is necessary to timely remove the fish nests in the other pool where eggs are attached to prevent the broodstock from swallowing eggs. At the same time, add a new fish nest and allow the unspawned broodstock to continue spawning. Spawning ponds should be protected from frogs, snakes and rats.
The artificial propagation methods of the loach are the same as those of the home fish. The oxytocin and the dose used are calculated according to each female mole: 0.5-1 for the pituitary gland, 2-3 for the frog pituitary, 100-150IU for the chorionic gonadotropin, Or the analogue (LRH-A) 0.5-1 gram. Dove the dose by half. The solvent injection volume was 0.1-0.2 mL, and injections were made using a 1 mL syringe and a 4 gauge needle. The injection site is the base of the pectoral fin or the pelvic fin, but it can also be injected back muscles. Muddy mucus is more than muddy and it is easy to move. It can be wrapped in wet gauze (exposed to the injection site). After being injected into the spawning pool, the work thereafter is the same as natural breeding. Water temperature 20-25 °C, after 10-20h estrus spawning.
If artificial insemination is used, male and female loaches that have been injected with the oxytocculum may be separately raised in small ponds or cages. When the water temperature is 18-25°C, after 10-15 hours, the eggs are discharged from the abdomen of the female gills with light pressure. The method of artificial insemination, operation methods and precautions are the same as home fish. Eggs are laid on the nest immediately after artificial insemination. The method is: Take 1 bucket of clean water and lay the fish nest flat at the bottom of the bucket. Then one person shakes the fish nest gently while stirring the water body. The other one slowly pours the eggs into the bucket to make the eggs evenly on the nest. Go to the nest and transfer to the hatchery for hatching.
Muddy fertilized eggs can normally hatch in the water temperature range of 20-30°C. Generally, fry can be hatched in about 2 days. With a small container of static water, frequently changing water (2 times per d change in water) the best hatching effect, eggs per liter of 400 to 600 eggs is appropriate. Avoid shock when hatching. The 1g/m3 malachite green solution can be used for disinfection to prevent parasites.
The newly hatched seedlings are not free to move. They are attached to the nest or other objects with their heads, and they are yolk-nutrient. The fry hatched in the pond is generally kept in the original pond, the water depth is maintained at 20-30cm, 500-1500 tails per m2 water surface is appropriate, and when the density is too large, part of the fry should be removed and incubated in another pool.
The seedlings hatched for 3 days and started feeding. At this point should be fed cooked crushed egg yolk or fish meal suspension, several times a day, the amount of feeding within 1h limit. In the next few days, cast water otters, rotifers, chopped silk cocoons or cocoons. When the fry grows to 1cm, it can be fed into the fry pool; small-density can be kept in the pond. After about 1 month, the fry grows up to 3cm and then goes into the fingerling pool, and can also be directly put into the rice field. Adult fish in ponds or potholes.
The fish pond area is suitable for 30-50m2. Before the seeds are released, they must be disinfected with clear ponds and basal fertilizers should be used to cultivate food organisms. The amount of seeds put is about 30g (800-1000 tails) per square meter. Half a month after the fish was released into the pool, feed the powdered compound feed and feed it twice a day. The dosage was 3%-5% of the fish's weight. Summer fish pond water temperature is high, we must always pay attention to changes in water quality, frequently changing new water. When the fish grows to more than 5cm, enter the adult fish feeding stage.

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