On mobile, it's easier to find them in the bottom left corner of the map.

For black pearls grinding, follow these steps:

1. Grab a tamed deep sea creature (Basilo takes DMG in deep waters)

2. Find the Ammonite or the lobsters (Ammonite sprays Rage ink for EVERY creature nearby to attack, even passive, and the lobster gives about 50 Topor each attack)

3. Once killing aby threat or the creature,, highly recommend an otter or Metal Pick for black pearls.

4. You got black pearls.

More Ammonite Encountering Tips