Choosing the oxytocin at the most suitable time is one of the keys to ensure the success of the artificial breeding of domestic fish. According to the author's investigation, in recent years, some fry producers have been hurrying to produce prematurely in order to catch the fish fry market earlier. Not only do the ovulation effects are poor, even if the broodstock is produced well, and the hatching is greatly affected by the weather and water temperature. Not worth the candle. How to determine the appropriate escaping period of the fish? The gonad development of broodstock is the main basis for determining the optimal ovulation period. There is a period of "waiting" after the ovary of the female parent develops to an effective ovulation period. This period is generally from the beginning of May to the beginning of June (depending on the region, oystercatchers and squid are approximately 30 days, grass and herring may be shorter. Less than this period, the effect of oxytocin on the ovary of female fish Not so much, the effect of oxytocin production is not good; miss this period, the gonads of the broodstock will be degraded, and the oxytocin effect will not be good.
Water temperature and climatic conditions are also the main factors that determine the time of production. The water temperature can be used to raise the puerperal home fish between 18°C ​​and 30°C. However, the broodstock needs to live for more than half a month at a water temperature of 18°C ​​or more. The gonads can eventually mature. The purpose of artificial breeding of domestic fish is to produce fry, so to determine the evacuation period must not only consider the appropriate conditions, but also consider the appropriate conditions for hatching. If the water temperature is too low or if the water temperature changes too much and the incubation time is too long, the emergence rate of hatching eggs will be greatly affected. Therefore, the climate change is frequent, the temperature is very unstable, and the water temperature will change with the change of temperature. At this time, it is generally not suitable to elicit production. It is better to wait until the water temperature is relatively stable.
According to the climatic conditions along the Yangtze River and the local production experience, it is generally advisable to start production at the end of April or the beginning of May. If the weather is warm early in the spring and the water temperature rises quickly, the date of production can be appropriately advanced. Otherwise, it must be delayed accordingly. some. Near the time of evacuation, the water temperature should be measured frequently and the local weather forecast should be watched. Where the minimum water temperature in the morning is above 18°C, and it can keep for a few days without falling, or when the weather is clear, the water temperature is appropriate, and in the last 3 days, there is no cold weather when the weather is cold and the rain can cool down. The large amount of production should be at 22 °C-28°C This is the optimum water temperature period.
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