Companion Animals

Welfare of Pet Hermit Crabs

Hermit crabs are popular low-cost pets but frequently suffer from inadequate humidity, housing, and social conditions in small plastic tanks.

Key Facts

Hermit crabs need access to both marine and freshwater simultaneously
They require a minimum of 10 gallon tanks with deep substrate for molting
Plastic painted shells sold at beach shops are harmful and restrict growth
Hermit crabs are social animals that thrive in groups of three or more
They can live over 30 years in appropriate conditions but die within months in inadequate setups

Welfare Considerations

Pet hermit crabs are among the most commonly mistreated invertebrates due to their low-cost novelty status. The mismatch between their complex needs and what most owners provide means the vast majority suffer preventable welfare deficits.

What You Can Do

Research hermit crab needs extensively before acquiring any
Provide at least 10 gallons per crab with deep coconut fiber substrate
Maintain appropriate temperature and humidity year-round
Only acquire captive-bred or ethically sourced hermit crabs