The pregnant period of anchovies is usually about 28 to 35 days, but the actual production time will be affected by many factors, such as water temperature, water quality and the health status of the mother fish. During pregnancy, the mother fish's abdomen will gradually become bigger, and she will show some special behaviors near childbirth, such as swimming frequently and looking for hidden places. When the mother fish is about to give birth, the mother fish will start to lay eggs or give birth to small fish.

In order to ensure the health of mother fish and small fish, it is necessary to provide suitable water quality and environment during breeding. Keeping the water temperature stable, providing enough food and proper hiding places are all helpful for the mother fish to lay eggs smoothly and the growth of small fish.