When the abdomen of the female fish is enlarged and black fetal spots appear, it is a sign of labor. The male fish can be fished out. Generally, the young fish will be born after 1 to 2 days.

Since both male and female fish have the habit of swallowing their larvae, it is better to use separate breeding tanks. After each birth, the parent fish and larvae should be separated with an isolation net immediately, and the parent fish should be moved to other tanks. The fish's belly will be swollen and it won't move. If the male fish approaches, it will be bitten and drive the male away. Red swordfish and guppies are similar. They are both ovoviviparous and give birth to young fish directly, but they will eat their young.

Extended information:

Notes:

1. The optimal growth temperature of red swordfish is controlled at around 25°C. The production cycle of female red swordfish is about 35 days, and the number of births is 30---300. The first litter is at least thirty or forty, and the peak can reach about 300.

2. When breeding red swordfish or other ornamental fish, attention should be paid to not keeping brood fish in the same nest for more than three generations to avoid inbreeding and the degradation of the species.

3. As a tropical fish, red swordfish has a very strict demand for oxygen in water quality. The amount of dissolved oxygen in the water directly affects the growth of the fish. Therefore, insufficient dissolved oxygen in the water will affect the growth of red swordfish. normal growth.

Baidu Encyclopedia-Red Swordfish