1. After the bullfrog eggs are collected, they can be patrolled around the spawning pool every morning after the bullfrog breeding season. In particular, the morning of the morning when the male frogs are buzzing, careful attention should be paid to the timely detection of egg masses. Since the proportion of frog eggs is smaller than water, after the water sees the membrane of the egg absorbs water and expands, so that the egg mass expands, causing inconvenience in collection. Therefore, the more timely it is to pick eggs, the better. This will prevent large frogs or natural enemies from swallowing eggs or sinking into the bottom of the pool. Care must be taken when picking eggs carefully. The eggs attached to the eggs should be cut first, and the eggs, water plants and other attachments should be gently moved into the basin, glass jars, buckets or other containers by hand. It is not appropriate to use nets for fishing. . After picking the eggs, slowly pour the eggs into the hatchery or other containers where fresh water has just been added for incubation. In order to prevent the eggs from agglomerating, eggs can be used to line the eggs and evenly distributed in the hatchery. In a hatchery without a hatchery, the frogs can be removed without picking eggs. Or enclose the eggs with a cage and allow the eggs to hatch directly in the spawning pool.
2. Incubation of Bullfrog Eggs (1) Incubation Equipment The hatching of bullfrog eggs can be performed in the hatchery tank. Small mud pools are generally used instead of earthen ponds or hatch cages instead. The cages are relatively good incubators, and the commonly used specifications in production are 200 cm 50 cm 60 cm and 120 cm 80 cm 60 cm. The wooden frame is used to nail the frame, and the net is laid on five sides. In the pond, the inner frog eggs, hatching frame commonly used 1-1.5 cm thick wood nailed into a 60 cm 40 cm 20 cm box, the bottom of the net, floating on the surface of the pool, can effectively prevent the bottom of the frog's eggs, net Use 40 mesh nylon mesh. In addition, aquariums, tubs, enamel basins, water tanks, etc. can be used as hatchery tools.
(2) The density of laying eggs is hatched with hatching tank or other containers. In general, frog eggs of 8000-10000 can be placed per square meter. If cages or frames are used, 1-2 million eggs can be laid per square meter, but It is advisable that the density be slightly lower in the hot season and the first raiser. When hatching in the hatchery, if the fresh water is newly injected in the pool before laying eggs, the oviposition density should be controlled to be less than 6000 grains per square meter, and no water can be changed during the hatching period.
(3) Egg management Egg fertilization This is a prerequisite for the decision to hatch. For this reason, the fertilization of the frog eggs must first be checked before the egg is laid. At 25°C, the eggs can be distinguished by entering the water for 2 hours. Generally, the fertilized eggs are transparent and the unfertilized eggs are dark and opaque. After 12 hours, the central black spots of the fertilized eggs are obvious, and the unfertilized eggs are opaque. Pink spots.
During the entire incubation period, it is important to adjust the water quality to ensure that the water is fresh and the dissolved oxygen is above 5 mg/l. In order to prevent deterioration of the water quality, it is necessary to change the water once a day or use slow-flowing water for hatching. Since the mechanical oscillation will affect the development and destruction of the embryo, the impact on the egg should be minimized when changing the water, and the egg mass should not be agitated. When adding water, slowly add water from one end of the pool along the pool wall, and the other end can use the water pipe from the bottom. Water and dirt suck out. If outdoor hatching is adopted, scaffolding should be done on the pool to prevent strong light and heavy rain showers. During the incubation period, the temperature of the water should be controlled between 20-33°C, and the earthworms can be hatched within 2-5 days. After hatching, the cockroaches do not respond to feeding and moving cockroaches. The hatched cockroaches are adsorbed on the water grass and the wall of the pond. They do not feed, and they rely on the yolk to maintain their lives. The hatched cockroaches usually begin to feed after 3-4 days. At this time, the cockroaches are reared and managed according to their habits.
2. Incubation of Bullfrog Eggs (1) Incubation Equipment The hatching of bullfrog eggs can be performed in the hatchery tank. Small mud pools are generally used instead of earthen ponds or hatch cages instead. The cages are relatively good incubators, and the commonly used specifications in production are 200 cm 50 cm 60 cm and 120 cm 80 cm 60 cm. The wooden frame is used to nail the frame, and the net is laid on five sides. In the pond, the inner frog eggs, hatching frame commonly used 1-1.5 cm thick wood nailed into a 60 cm 40 cm 20 cm box, the bottom of the net, floating on the surface of the pool, can effectively prevent the bottom of the frog's eggs, net Use 40 mesh nylon mesh. In addition, aquariums, tubs, enamel basins, water tanks, etc. can be used as hatchery tools.
(2) The density of laying eggs is hatched with hatching tank or other containers. In general, frog eggs of 8000-10000 can be placed per square meter. If cages or frames are used, 1-2 million eggs can be laid per square meter, but It is advisable that the density be slightly lower in the hot season and the first raiser. When hatching in the hatchery, if the fresh water is newly injected in the pool before laying eggs, the oviposition density should be controlled to be less than 6000 grains per square meter, and no water can be changed during the hatching period.
(3) Egg management Egg fertilization This is a prerequisite for the decision to hatch. For this reason, the fertilization of the frog eggs must first be checked before the egg is laid. At 25°C, the eggs can be distinguished by entering the water for 2 hours. Generally, the fertilized eggs are transparent and the unfertilized eggs are dark and opaque. After 12 hours, the central black spots of the fertilized eggs are obvious, and the unfertilized eggs are opaque. Pink spots.
During the entire incubation period, it is important to adjust the water quality to ensure that the water is fresh and the dissolved oxygen is above 5 mg/l. In order to prevent deterioration of the water quality, it is necessary to change the water once a day or use slow-flowing water for hatching. Since the mechanical oscillation will affect the development and destruction of the embryo, the impact on the egg should be minimized when changing the water, and the egg mass should not be agitated. When adding water, slowly add water from one end of the pool along the pool wall, and the other end can use the water pipe from the bottom. Water and dirt suck out. If outdoor hatching is adopted, scaffolding should be done on the pool to prevent strong light and heavy rain showers. During the incubation period, the temperature of the water should be controlled between 20-33°C, and the earthworms can be hatched within 2-5 days. After hatching, the cockroaches do not respond to feeding and moving cockroaches. The hatched cockroaches are adsorbed on the water grass and the wall of the pond. They do not feed, and they rely on the yolk to maintain their lives. The hatched cockroaches usually begin to feed after 3-4 days. At this time, the cockroaches are reared and managed according to their habits.
Hebei Abiding Co.Ltd, a professional food supplier, was established in 2005 in Shijiazhuang, China. We specialize ourselves in supplying Organic Tomato Paste and Organic Pasta. Conventional ones are also available to supply. We can make the private labels according to the customers' requirement. Our products have EU, NOP and JAS organic certificates. They are also Kosher certified. We have business relationships with importers and wholesalers from around the world, mainly in Europe and America. Over the years, we have earned highly recognition from clients due to our qualified service and steadily increase our market share year after year.
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