A method of prompting eels to lay eggs in advance

Abstract

The invention discloses a method for prompting ricefield eels to spawn in advance. The method comprises keeping the aquaculture water temperature between 15 to 35 DEG C and or throwing marsh pennywort into aquaculture water. According to the method for prompting the ricefield eels to spawn in advance, 2 to 4 months of the spawning time of the ricefield eels can be advanced than that under the natural conditions, so that seedling breeding in the current year can be achieved, seedlings can be provided in the current year, and the breeding cycle of the seedlings of the ricefield eels is reduced.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to a method for promoting eels to lay eggs in advance. Background technique [0002] Field eel (Monopterus albus Zuiew) is one of the few traditional agricultural products that are in short supply. In the world, especially in Japan and South Korea, the saying of "medicine eel, longevity turtle, and loach ginseng" is widely spread. The annual export volume of rice field eel in my country has been growing steadily, mainly exported to Japan, Hong Kong and Macao. In the domestic market, it can be said that "there is no feast without eel". However, with the increase in the amount of chemical fertilizers and pesticides used in agricultural production in my country, and the hardening of ditches, rivers and lakes, the habitat of rice field eels has continued to deteriorate, and the amount of fishing has decreased sharply. At the end of the 1990s, my country began to raise eels artific...

AI Technical Summary

Problems solved by technology

Although, by optimizing the selection of parents, reasonably controlling the breeding density of parents, improving nutritional conditions and creating suitable habitat conditions (such as setting mud ridges, etc.), rice field eels can be allowed to spawn in advance, but the time is relatively short, generally only 10 to 15 days in advance (Ruan Guoliang et al., Patent publication number CN101933470A ), the seedlings cultivated in that year could not be used to grow commercial eels in that year

In addition, in production, aquatic plants such as water hyacinth (Eichhornia Crassipes Solm.), water peanut (Alternanthera Philoxeroides Griseb), and water lotus (Pistiastratiotes) are generally selected as places for rice field eels to lay eggs. 35°C is the optimum temperature for growth and development, germination begins at 10°C and above, and it will wither soon after encountering frost in late autumn; it likes water, fertilizer and strong light, and it is suitable for weak light conditions (such as indoors) and water quality (generally) Due to the low breeding density and thin water quality in the eel breeding pond), these aquatic plants often do not grow well or even die