Your Constitution score increases by 2, and your Strength score increases by 1.

Crabfolk reach adulthood around age 20 and can live up to 100 years

Crabfolk are between 5 and 7 feet tall and weigh between 200 and 300 pounds. Your size is Medium.

Your base walking speed is 30 feet and you have a swimming speed of 40 feet.

Crabfolk tend toward lawful alignments, valuing order and tradition. However, their connection to the natural world and their respect for the balance of nature can lead them to choose a neutral alignment.

You have a natural armor that gives you an AC of 13 + your Constitution modifier.

Your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d6 + your Strength modifier.

You can breathe underwater and have advantage on Constitution checks made to resist the effects of a harsh underwater environment.

You have proficency in the Perception skill.

One of your pincers is huge, whether is be left or right, you can't write or hold items with the light or one handed property. However two-handed weapons now are considered one handed for your pincer. At fifth level, as a bonus action you can try grapple an enemy with your pincer. They have to make a Strength save equal to 8 +proficiency bonus +Str modifier.  You can use this feature equal to your proficiency bonus per long rest.

You can speak, read, and write Common and Aquan.