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First, the living habits of the otters Breeding individuals are small, about 100 mm long, but the population yield is higher. The difference between the cercariae and the filigree plague is that the former has a tail ridge, the tail often exposes the mud outside, swings with the water, and the quivering accelerates in the absence of oxygen; the latter does not have a cercariae. Otters hi live in the mud of organic-rich micro-mud waters, generally lurking 10 cm to 25 cm below the mud surface, and they are buried deep in the mud at low temperatures. The otter is dizzy and afraid of light and cannot be exposed to sunlight. It uses organic matter to suck up organic humus, bacteria, and algae. Leech is sexually mature for about 2 months, hermaphrodite, allogeneic fertilization, egg capsules in the cystic ridge made of transparent glial membrane. Generally, one quail contains 1 to 4 eggs, and more than 7 grains. Reproductive period, each adult can discharge 蚓茧 2 ~ 6. When the water temperature is 22 to 32°C, the incubation period is generally 10 to 15 days, and the artificial culture has a lifespan of about 3 months.
Second, the pit method
1. Hang pool conditions to build an ecological environment suitable for aquatic life, require micro-flowing water, loose soil, rich humus, dark and so on. Pit pool can be newly excavated or used to reconstruct the puddle that communicates with the ditches. The area can be determined as required. 3 to 5 m2 (3:1 to 5:1 aspect ratio) is appropriate, the water depth is 20 to 25 cm, and the bottom is used Water-retaining loess or triaxial soil is built at the bottom, and is set in the drainage outlet. General inlet and outlet should be separated, and one end of the water inlet should be drained. Before introduction into the pit, we must also cultivate a good sediment, preferably digging fertile fish pond silt, laying in the bottom of the pit, 10 cm thick, and then add livestock manure or farmyard fertilizer 7.5 to 10 kg per square meter, and finally adding Fermented cakes, bran, glutinous rice, etc.
2. The introduction and introduction of pits depends on the quality of water, mud, manure source and season. Fertilizer source, mixed feed source, etc. are sufficient, with large introduction volume and high yield. Generally put 0.25-0.5 kg per square meter. After 30 to 45 days of cultivation, the harvest amount per mu can reach 10 to 15 kilograms and the maximum can reach 48 kilograms.
3. Management to maintain micro-flowing water, so that the water is fresh, high dissolved oxygen, accelerate the dissipation of metabolites, increase the growth of pupa feeding. The flow rate of the general flow is 2-8 cm/sec. The speed cannot be too fast. If it is too fast, the water will wash away nutrients and ripples and affect the output. After the introduction of earthworms, they should be fed every 2 to 3 days. If the input is concentrated feed, the feed coefficient is about 2.6; if using pigs, cattle manure, the feed coefficient is 7.8 to 10.4.
4. Harvesting can reduce the flow of water or water in the evening, resulting in the lack of oxygen in the morning or the next morning. The otters will be forced to cluster and float in the mud or float to the surface.
Easy and easy water pit maintenance
Breeding famous special aquatic products, feed is its important material basis and constraining factors, it is related to the success or failure of breeding breeds and the efficiency is good or bad. The leeches reproduce quickly and have high nutritional value (dry matter contains 62% crude protein, total essential amino acids up to 35%, and nitrogen recovery rate reaches 98%). It is the opening bait for many aquatic animal seedlings during the period of their breeding season. The main food for fish, crucian carp, clams, clams, giant salamanders, and yellow snappers. The species suitable for breeding in aquatic oysters are: S. urticae and HL. Raising the water fleas can provide long-term, stable, high-quality animal feed for aquaculture products, reduce the cost of breeding, and improve the breeding efficiency and quality. Here is a simple and easy way to keep water pots.