After spring, as the water temperature rises, the gonad develops and gradually transforms, especially before the middle of May, the ovary has an ovary coefficient of 15% to 20%. Therefore, the development of broodstock in spring has a good impact on the broodstock breeding and fish production, and the following management measures must be strengthened.
First, timely pooling. In order to grasp the growth and development of broodstock and reasonably arrange oxytocin breeding, the broodstock should be pooled when the water temperature is around 10°C, and the broodstock that is cultivated in ponds with larger areas during wintering should be transferred to a small area of ​​1 mu to 2 acres of water. The pond is cultivated, and the disinfection of the small pond is done before the separation. The well-developed broodstock should be incubated separately from the broodstock with poor growth and development. The density should be 120 kg to 150 kg per mu, and the broodstock to be stocked in each pond should be culled best once. In this way, when the broodstock are caught, it will not affect other broodstock that have not yet been elicited, and the broodstock that is injured by the disease can be discovered in time when the broodstock is pooled, so that timely medical treatment can be performed.
Second, reasonable feeding. After the spring, the water temperature rises. The gonads are in a stage of vigorous growth and need a lot of nutrients. The spring breeding of oysters and broodstock is still dominated by fertilizing and cultivating bait. Before the cistern, the basal fertilizer should be applied in the pool. Generally, 300 kg to 500 kg of organic fertilizer is applied per acre pond. In order to cultivate broodstock, broodstock should be used for large feces, broodstock should be cultivated with more animal manure, and the amount of topdressing should be less, so that the pool water is both live and fat. The transparency of the water body is about 30 centimeters, and 15 days before oxytocin production, fertilization can be reduced or stopped. . Grass broodstock should be dominated by green material, supplemented with fine material, and then be fed with grain buds, malt, etc., and be fed with lettuce leaves, ryegrass, etc. as early as possible. Then it should be transferred to the green material only, near the ovulation period, and be fed even less. Green feed is stopped; green brooders are fed mainly with snails and clam meat, supplemented with bean cake or compound feed.
Third, scientific management of water. After the beginning of spring, the water depth of the pond should be controlled at about 1 meter. This will not only help the water temperature to rise, but also promote the propagation of food organisms, which in turn will facilitate the feeding of fish. Broodstock ponds should always be flushed with fresh water to keep the water fresh and increase the amount of dissolved oxygen in the water to facilitate the growth and development of the broodstock.é²¢ é³™, é³™ é³™ é³™ é³™ 10 10 10 10 10 10 10 10 10 10 10 è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ é’ é’ é’ è‰ é’ è‰ é’ é’ é’ é’ é’ é’ é’ æ–° æ–°~20 cm.
Fourth, prevention and treatment. The broodstock ponds splash lime once a week, with a dosage of 15 kilograms to 20 kilograms per acre, and timely adjust the pH value of the pool water to maintain the pH at 7.5-8.0 to facilitate the normal development of the brood brood.
First, timely pooling. In order to grasp the growth and development of broodstock and reasonably arrange oxytocin breeding, the broodstock should be pooled when the water temperature is around 10°C, and the broodstock that is cultivated in ponds with larger areas during wintering should be transferred to a small area of ​​1 mu to 2 acres of water. The pond is cultivated, and the disinfection of the small pond is done before the separation. The well-developed broodstock should be incubated separately from the broodstock with poor growth and development. The density should be 120 kg to 150 kg per mu, and the broodstock to be stocked in each pond should be culled best once. In this way, when the broodstock are caught, it will not affect other broodstock that have not yet been elicited, and the broodstock that is injured by the disease can be discovered in time when the broodstock is pooled, so that timely medical treatment can be performed.
Second, reasonable feeding. After the spring, the water temperature rises. The gonads are in a stage of vigorous growth and need a lot of nutrients. The spring breeding of oysters and broodstock is still dominated by fertilizing and cultivating bait. Before the cistern, the basal fertilizer should be applied in the pool. Generally, 300 kg to 500 kg of organic fertilizer is applied per acre pond. In order to cultivate broodstock, broodstock should be used for large feces, broodstock should be cultivated with more animal manure, and the amount of topdressing should be less, so that the pool water is both live and fat. The transparency of the water body is about 30 centimeters, and 15 days before oxytocin production, fertilization can be reduced or stopped. . Grass broodstock should be dominated by green material, supplemented with fine material, and then be fed with grain buds, malt, etc., and be fed with lettuce leaves, ryegrass, etc. as early as possible. Then it should be transferred to the green material only, near the ovulation period, and be fed even less. Green feed is stopped; green brooders are fed mainly with snails and clam meat, supplemented with bean cake or compound feed.
Third, scientific management of water. After the beginning of spring, the water depth of the pond should be controlled at about 1 meter. This will not only help the water temperature to rise, but also promote the propagation of food organisms, which in turn will facilitate the feeding of fish. Broodstock ponds should always be flushed with fresh water to keep the water fresh and increase the amount of dissolved oxygen in the water to facilitate the growth and development of the broodstock.é²¢ é³™, é³™ é³™ é³™ é³™ 10 10 10 10 10 10 10 10 10 10 10 è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ è‰ é’ é’ é’ è‰ é’ è‰ é’ é’ é’ é’ é’ é’ é’ æ–° æ–°~20 cm.
Fourth, prevention and treatment. The broodstock ponds splash lime once a week, with a dosage of 15 kilograms to 20 kilograms per acre, and timely adjust the pH value of the pool water to maintain the pH at 7.5-8.0 to facilitate the normal development of the brood brood.
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