Marmorkrebs · Procambarus

Use As Feeders

Marbled crayfish make great feeders for aquarium animals, and work well frozen as fishing bait.

Feeding aggressive fish

Because they grow through such a wide range of sizes, marbled crayfish suit a lot of aggressive aquarium fish, freshwater and marine alike — cichlids, lionfish, moray eels, and other predators that do well on a live-food diet, along with some amphibians and reptiles.

Fishing bait

The same range of sizes appeals to anglers targeting bass, crappie, catfish, trout, and redfish. As a freshwater species, live marbled crayfish also work as saltwater bait — they won't survive more than a couple of hours in salt water, which keeps them from becoming an ecosystem problem there.

The one thing to watch: don't release leftover live crays into freshwater lakes or streams. Since this species reproduces on its own, a handful of escapees could theoretically establish themselves somewhere they don't belong. Realistically, native fish, reptiles, and other predators would make quick work of them, and the species likely wouldn't survive a winter freeze even in warmer states — but to stay on the safe side, we recommend using frozen crays for freshwater fishing rather than live ones. For the same reason, raising this species in outdoor ground-level ponds isn't a good idea; rain overflow and birds both create a path into natural waterways.

Raising your own for bait

We've tried buckets and styrofoam boxes, and heard of people using horse troughs, but an aquarium gives the best, most consistent yield of babies — and bigger is better. Some fishermen dedicate one or two 55+ gallon tanks in a garage setup just for raising bait crays. The same setup covered in Cray Care applies here — undergravel filtration, lava rock, an outside canister filter, and stacked PVC hides. It's low-maintenance once it's running: new babies arrive every 5 to 7 weeks once a batch reaches about 6 months old, so within a few months to a year you'll have an ongoing supply. Whatever you raise for bait should be dead and frozen before use, not live.

Human food?

There are rumors that Chinese farms have begun raising marbled crayfish as a cheap food source. Neither the FDA nor USDA has taken a position on the species or tested it for human food safety.

Legal status

Marbled crayfish are legal to keep in most US states, with the exception of Nevada and Oregon. Check your own state's illegal-species list before acquiring any. We don't ship outside the USA.

We're no longer offering marbled crayfish ourselves — see the Ordering page for more on that. The Cray Care section covers most of the practical questions that used to come up directly.

Everything on this page reflects personal, hands-on experience — not the results of formal academic research.