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Red Swamp Crayfish (aka Procambarus clarkii) will get up to 5" body length not including length of claws, similar to beer can length.
Predation/Herbivory: Red swamp has been shown to reduce macrophyte density through feeding, and to reduce macrophyte diversity through selective consumption (Cronin et al. 2002; Smart et al. 2002). NOTE - Most any crayfish at high densities can reduce or denude submerged vegetation. The species also feeds on a variety of biota, including waterfleas, insects, and other crayfish (Gutiérrez- Yurrita et al. 1998). It's consumption of the egg masses and juveniles of the threatened California newt (amphibians) , Taricha torosa, the endangered razorback sucker Xyrauchen texanus, and the native toad Bufo calamita, is a cause for concern for the species (Gamradt and Kats 1996; Mueller et al. 2006; Cruz et al. 2006).

NOTE If it eats eggs of the sucker and frogs it would also eat other fish eggs and newly hatch fish in the bottom of fish nests. Largest ones could chase some fish off nests. Too many would definitely cause muddy water and significantly reduce pond productivity and overall fish production so instead of helping the fishery they could easily reduce the fishery. Cloudy water as muddy water hinders primary productivity and the base of the fish food chain.

Competition: Procambarus clarkii outcompetes not only other native crayfish (Mueller et al. 2006; Gheraridi and Daniels 2004), but also other native animals, such as dragonfly nymphs (Bucciarelli et al 2018), and amphibians (Bélouard et al 2019), reducing their density in the habitat. NOTE they can reduce the numbers of fish food invertebrates that are the important secondary part of the food chain.

Habitat Alteration: Procombarus clarkii can be a vector for spreading other nonindigenous species or transplanting natives outside of their range via commensalism or through their gut (Clark and Wroten 1978; Lovas-Kiss et al. 2018). The species builds extensive burrows along shorelines that collapse and create erosion (Barbaresi et al. 2004).

Them're some big mudbugs!