Overwintering management of farmed forest frog in closed ditch

Forest frogs have the habit of hibernating under water. The overwintering management of artificial ditch raising frogs is to artificially select and create suitable overwintering places and water environment according to the life characteristics of forest frogs during this period, which lasts for 6 months from late September to mid-late April of the following year, to ensure their safe overwintering.

I. Construction of overwintering ponds

The overwintering pool, also known as the hibernating pool, is the place where forest frogs concentrate on hibernation. Some natural blisters, mountain stream deep water bays or reservoirs in frog farms can be used as natural overwintering ponds for forest frogs, but most frog farms need to build overwintering ponds manually.

1. Select the site in or near the place where the forest frog is concentrated downhill in autumn, choose the side of the river (stream), avoid the river for 5-10 meters, and choose the flat and clayey area as the place to build the overwintering pool.

two。 The specification and quantity of the overwintering pool are required to build the overwintering pool with a depth of 3mur4 meters and a water depth of 2Mel 2.5 meters, with a flat bottom and a slope of 70 Mel and 80 degrees around, which is waterproof and collapses after immersion. If the sand at the bottom of the pool is loose, clay should be used to prevent water seepage. The construction area and quantity of the overwintering pond are determined according to the topographic conditions of the frog farm and the number of overwintering frogs all the year round. The terrain is flat and open, and a large overwintering pool can be built, with a single pool area of 800,000m2. Small and medium-sized overwintering ponds can be built for those with poor terrain conditions. The number of overwintering ponds is determined according to the amount of overwintering frogs raised all the year round, the general overwintering density of adult frogs is 80 Mel 100 per square meter, and that of young frogs is 200 mi 300 per square meter. Four small and medium-sized overwintering ponds are built in a frog farm, which can support 20, 000 to 30, 000 breeding frogs and 15 to 300000 young frogs to survive the winter. When building multiple overwintering ponds, the distance between each other should reach 500 Mel 1000 meters, so as to achieve single irrigation and single row.

Preparation before the use of the overwintering pool

An overwintering pool that has been recycled for many years. The silt at the bottom of the pond is thick, which affects the water storage capacity, and accumulates a large number of forest frog pathogenic bacteria and natural enemies, so it should be carefully trimmed before the overwintering season.

1. Dredging will release the water of the pool, remove the silt from the bottom of the pool and restore it to the bottom of the original pool.

two。 After basking to remove the mud, it is necessary to control the water intake and let the bottom of the pool be exposed to the sun for 20-30 days, which can kill some germs and insect pests.

3. For 30 days before sterilization, quicklime was sprinkled on the bottom and surrounding walls of the pool for disinfection. This method can effectively kill forest frog pathogens, leeches, parasites and other natural enemies.

4. Lay concealment before irrigation, lay a layer of broad-leaved tree leaves about 5 cm thick on the bottom of the pond or covered with grass bundled with Gramineae weeds, and then slightly covered with gravel and silt. these conceals are beneficial for forest frogs to hibernate under water.

5. Water injection at the end of October, the forest frog enters the overwintering pond to store full water before hibernating, the water depth is 2.5 meters, keep clean.

III. Overwintering management

In mid-September, when the temperature dropped below 10 ℃, the forest frog began to migrate to the downhill water source. From the beginning of November to the middle of November, the temperature dropped below 5 ℃, and the forest frog entered the deep water area to hibernate until the end of March to the beginning of April of the following year.

1. The diaspora hibernating period is managed from mid-September to early November, 45mur50 days. The characteristic of this period is that most of the forest frogs lurk in the shallow water alone, are in an unstable hibernating state, and can still go to land at night. The focus of management during this period is that the captured forest frogs are separated according to commercial frogs, breeding frogs and annual young frogs, and the breeding frogs and young frogs are respectively sent to the frog storage pond for storage. The water depth of the frog storage pond is 40 meters and 80 centimeters, and the frog density is 500 meters per square meter. The frog storage pond can be used both as an incubator and a tadpole feeding pond. If there is enough water in the frog farm, the overwintering pond can also be used temporarily instead, that is, the overwintering pool should be kept at a depth of 50 mi 80 cm. Put in the overwintering frog and replenish the overwintering pool water to a depth of 2.5 meters in time before the forest frog goes into hibernation in early November. The frog storage pond should be surrounded by a fence with a height of 50 mi 60 cm with plastic sheeting, and the bottom should be compacted to prevent the forest frog from escaping. As the forest frog lurks in shallow water, it is necessary to prevent man-made theft and predation by all kinds of predators in management and protection.

two。 Centralized hibernation period management from the first ten days of November to the end of March of the following year, this period is characterized by the concentration of forest frogs in the deep water area, crowded with each other, do not eat and do not move, in a state of deep hibernation. The main points of management during this period are as follows:

① sends the overwintering frogs in the frog storage pond to the overwintering pond in time. The frog density in the overwintering pond is 100 frogs per square meter and 300 frogs per square meter, keeping live water for overwintering. The winter in Northeast China is cold, and the rivers and streams in many farms will freeze off after entering the winter. The overwintering density of forest frogs in such overwintering ponds should be properly halved.

During the overwintering period, ② often observes the current situation and keeps the water level under the ice no less than 1.5m.

After the snow falls in ③, it is necessary to clear the snow on the ice or clear the snow path in time to enhance the light transmittance of the pool water.

④ put rat traps and rat poison around the overwintering pond to prevent the harm of carnivorous natural enemies such as rats.