Enemy damage of soft-shelled turtle and its control methods
The enemies of soft-shelled turtle mainly include rats, snakes, birds, ants, mosquitoes, etc., which mainly harm soft-shelled turtle eggs and juveniles under 1 year old. Among them, rats are the most harmful to turtle eggs. The dead of night is a good time for soft-shelled turtles to lay eggs. Rats will also take advantage of this to come out of their holes and frequently move around the laying sites. On the one hand, they interfere with the normal laying of soft-shelled turtles. On the other hand, rats dig holes everywhere on the sand bed, causing the eggs to vibrate and lead to embryo death. Young and young turtles are also easy to be besieged and preyed upon by rats. Some adult turtles with poor physique and slow reaction are often attacked by rats when resting on the shore. Rats eat turtle, first bite turtle neck, then bite throat, take out internal organs to absorb blood, feed turtle meat, and then escape. Once bitten by rats, if measures are not taken in time, 3~4 turtles will be killed in one night, and dozens will be killed, especially for young and young turtles. The second is snakes, because they will dig sand, swallow turtle eggs and just hatched young turtle shell, harm is very big. Cormorants, kingfishers and other birds, mainly prey on young turtles, some birds can also carry pathogens, thus spreading diseases. Therefore, in the process of raising turtles, it is necessary to strengthen the prevention and control of these enemies. The prevention and control methods are as follows:
1. It is better to use cement brick structure for the wall of soft-shelled turtle egg incubation room and juvenile soft-shelled turtle pond, leaving no caves, blocking the passage and hiding place of rats and snakes;2. Ant-proof ditch shall be built around the incubation room, with the depth and width of about 10cm. Water shall be injected into the ditch to prevent ants from entering the room;3. Bait is often used to poison rats and snakes around the spawning ground, hatchery and juvenile soft-shelled turtle pond, or traps shall be set up to catch them;4. Mosquito spraying shall be frequently used;5. Birds can be prevented by opening nets, or driven away by slingshots and other tools.
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Relationship between disease of eel culture in soil pond and water environment
The water environment is the decisive factor for raising eel. The water environment not only determines whether eel can be cultured, but also directly affects the yield, and finally affects the economic benefits of eel culture. Therefore, only by improving the water environment can we raise eels well. The following focuses on analyzing the relationship between eel disease and water environment from the following aspects. 1. The pH value in pH water is an important comprehensive water quality index, which directly affects the physiological status of eel. When the biological, chemical or physical composition of the water body changes, it will be shown in the pH value, and the eel in the soil pond requires the pond water.
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Flatfish (turbot)
Flatfish (Scopthalmusmaximus) is a kind of marine flounder with high economic and protein demand, which is raised in northern Europe, especially along the Atlantic coast. Recently, there has been a study on the effectiveness of using soybean protein concentrate as the main source of protein in feed. in this study, soybean protein concentrate was used to replace 0, 25%, 50%, 75% and 100% fishmeal in feed, respectively. the initial weight of the experimental fish was 13 grams. At the end of the experiment, it was found that 25% of the fishmeal in the feed was replaced by concentrated soy protein.
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