The guppy may be going to be born soon after pulling black excrement, because the guppy is oviparous, and the eggs will develop into small fish larvae in the mother before being born. There will be a layer of black on the surface of fish eggs. After the fish eggs mature, this layer of black things will be discharged together with the mother's feces. Therefore, the guppy's black excrement may be a sign that the young fish have matured and are about to give birth.

But it doesn't mean that they are going to produce just by pulling black shit, because guppies eat more live bait, and they will also pull black shit. Breeders need to make comprehensive judgments according to their mating time and other performances.

1. Abdominal enlargement: As mentioned above, guppies are oviparous, so before they give birth, their abdomen will become very large. Especially near birth, their bellies will become square.

2. Reduced activity: The activity and appetite of guppy female fish will decrease during production. Because of their large abdomen, they are not very flexible. Moreover, abdominal swelling will squeeze into internal organs, causing their appetite to decrease.

3, tail raised: The guppy's anal fins shrink near production, but the tail will be raised from time to time. If this happens, it means that they are about to produce.