Infertile mystery snail egg clutch on left. Fertile clutch that will hatch within a day or two on the right.

What does an infertile mystery snail egg clutch look like?

People often ask if their egg clutches are fertile so here is an example of an infertile clutch (left) next to a fertile clutch (right).

These two clutches were laid within 2 days of each other. The one on the left is “bad” or mostly if not completely infertile. See how the egg cells are small and not very bubble like? Two other tips on detection: 1) smell a clutch that you suspect is bad if it’s been at least two weeks. Infertile or bad clutches have a distinctive smell while healthy/fertile clutches do not. If the clutches are sitting on a damp paper towel, do you see a red/pink stain under one? Only infertile clutches will stain the paper towel. You can see in the photo above that the left clutch has stained the paper towel pink underneath it.

The one on the right is very fertile and it will likely hatch In the next day or two. It would still be necessary to wait a week to 10 days to be able to tell this as egg development is unclear until that much time has passed. About 3 days before hatching, a fertile clutch will start to change color to look moldy prior to hatch. You cane see the color changes in the Mystery Snail Egg Development page link below.  It takes anywhere from 10 days to 4 weeks for an egg clutch to hatch based on temperature and other conditions.

See: Mystery Snail Egg Development Photo Gallery Page.

8 thoughts on “What does an infertile mystery snail egg clutch look like?”

  1. Obviously if I wasnt new to the experience of mystery snails I wouldn’t be here.
    I have a male and female in an aquarium. They laid a clutch for the first time in the 3 months we had them. I had to relocate my clutch and I’m not sure if I’m doing everything correct. I have them in a tupperware container, its sitting near the heater, and filter. I also check on it daily so I know it’s safe.

    It’s been about 2 weeks since lay. I’m keeping it moist but they are still hard, and pink. How much longer should I try before giving up? 2-3 weeks?

    Thank you for reading.

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    1. I can’t answer that for certain. Some bettas leave mystery snails alone (especially if raised with them) but others may harm them. I have seen young bettas eat ramshorn snails but not mystery snails personally.

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