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RUSTY CRAYFISH

Where did they come from?

The Rusty Crayfish originally originated from the Ohio River Basin

Where are the crayfish located?

How did they get to Michigan?

The Rusty Crayfish were released into our waters by anglers (fisherman), who were trying to use them as bait. That allowed the crayfish to spread

Invasive Species

What do they look like?

How do they act?

They have very robust claws. The crayfish have dark, rusty spots on their shell. Male crayfish molt, or shed their shells, twice per year. While females, molt once a year. The crayfish usually lives for 3 to 4 years.

Non-native to the Great Lakes

What do they eat?

Rusty Crayfish are opportunistic eaters, meaning they feed on whatever food is available. They usually eat aquatic plants and invertebrates such as snails, leaches, clams, and aquatic worms. They also eat decaying plants and animals, fish eggs, and small fish.

How can we help control the population of Rusty Crayfish?

How are they adapting?

The main way we can control the invasive species is to not use them as bait for fishing.

The invasive species learned to seek shelter better than than the native species in the area. They adapted quickly and learned to survive in their new habitats.

How are they harmful to Michigan?

What is being done to control the population?

The rusty crayfish are hybridizing with the native crayfish. They are also decreasing the density of invertebrates. They're reducing the variety of the aquatic plants that the native species need for shelter and food.

Extreme trapping of the crayfish were found to be very productive. Enhanced fishing predation was also found to be productive.

Mycah Lewis

Alexis Dotson

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