Selecting the fish: Choose more than one pound of fish. For females, the abdomen should be swollen and soft, with redness and swelling around the anus and genital pores, as well as visible congestion. Males should have a white milky substance released when their abdomen is gently squeezed, and there should be no swelling near the anal area.
Water spawning setup: Place male and female fish in a suspended fish cage within the water, and provide a suitable spawning nest. Position the fish so that their backs are approximately 3 cm below the water surface. This helps stimulate spawning through temperature differences and gentle water flow. If 2 ml of 50% glucose is injected into the base of each pectoral fin of the female, it can significantly enhance the spawning process.
Incubation: It's best to use fresh water in the spawning and hatching ponds. The water should not be too rich or murky. The ideal water temperature ranges between 18°C and 22°C. Use smooth, rootless daffodils without mud to help produce oxygen. Cut the stems and leaves so they don’t stick to the eggs and prevent them from being sunburned. Also, make sure to keep males away from the eggs to avoid predation and improve hatching success.
Proper care during this stage is crucial for the survival and development of the eggs. Regular monitoring of water quality and temperature ensures a higher hatch rate. Additionally, maintaining a clean environment and avoiding sudden changes in conditions will support healthy fry development.
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