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Procambarus troglodytes (LeConte, 1856)
Eastern Red Swamp Crayfish
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: G5
State Rank: S4S5
Element Locations Tracked in Biotics: No
SWAP 2015 Species of Greatest Conservation Need (SGCN): No
SWAP 2025 Species of Greatest Conservation Need (SGCN): No
2025 SGCN Priority Tier: None
Element Occurrences (EOs) in Georgia: 0
Habitat Summary for element in Georgia: Georgia habitat information not available
The overall color of the Eastern Red Swamp Crayfish includes reds, reddish-browns, and pinkish hues. The back is dark reddish brown and the upper sides have a dark longitudinal stripe. Below the stripe the body is pinkish-cream with white speckles and whitish splotching. There are numerous small, dark tubercles on the carapace. The abdomen has dark transverse bands on each segment which create the appearance of a broad, dark longitudinal stripe. The claws are dark red to blackish with bright orangish-reddish tubercles. Another color form is overall brown with dark splotches and pale orange tubercles on the claws. There is a single row of large tubercles along the mesial margin of the palm and many scattered tubercles on its dorsal surface. The areola is narrow and may be obliterated. The rostrum is long and pointed and often has marginal spines or tubercles, especially on juveniles. A single cervical tubercle is usually present and may be a sharp spine on juveniles. This species reaches a maximum total body length of about 90 mm (3.5 in).
Across most of its range, there are no other crayfish species with orangish-reddish tubercles on the claws. There are two records of Ornate Crayfish, Procambarus howellae (close relative) near the southeastern extent of the range of Eastern Red Swamp Crayfish. Details of the male reproductive structures are required to separate these species from one another. Another similar species that must be considered is the Red Swamp Crawfish (P. clarkii), a non-native species widely introduced around the world as a food source for people. There are currently no known populations within the range of Eastern Red Swamp Crayfish, but it is possible they could turn up. Again, details of the male reproductive structures are required to separate Eastern Red Swamp Crayfish from this species.
The Eastern Red Swamp Crayfish occurs in permanent streams and swamps as well as temporary habitats such as ditches and ponds. In streams it is usually associated with vegetation or woody debris or undercut banks. In areas where open water recedes, it can be found in simple burrows.
No studies of the Eastern Red Swamp Crayfish are known. Crayfishes are considered opportunistic omnivores and likely feed on live and decaying vegetation, aquatic insect larvae, small fishes, and dead animal matter.
Stream dwelling crayfishes typically hide during the day and come out at night to feed. Reproduction usually occurs during the spring and fall, but males in reproductive condition may be found at any time during the year. When female crayfish are ready to lay eggs, they usually find a secure hiding place and hence are rarely encountered. When the eggs are released, the female attaches them to her swimmerets and is said to be “in berry.” Upon hatching, the juvenile crayfish are attached to the mother by a thread. After the juveniles molt for the second time, they are free of the mother, but stay close and will hold on to her for some time. Eventually they move off on their own. Crayfishes molt 6 or 7 times during their first year of life and most are probably able to reproduce by the end of that year. Male Eastern Red Swamp Crayfish in reproductive condition have been collected in February, March, April, May, June, and December. No females with eggs or young have been collected. The lack of female specimens carrying eggs suggests that they retreat to burrows to lay eggs and rear young. The smallest breeding male known is about 60 mm (2.7 in) in length (Hobbs 1981).
In streams or ponds, kicking through vegetation into a net can yield specimens. If there are rocks or logs in the creek, they may be carefully lifted and crayfish may be pinned by hand or coaxed into a dipnet. Excavation of burrows adjacent to drying ponds or ditches should also yield specimens.
The Eastern Red Swamp Crayfish ranges from the Altamaha River system in Georgia to the PeeDee River system in South Carolina (Hobbs 1989). In Georgia it is most common in the Canoochee, Newport, Ogeechee, and Savannah basins in southeastern portion of the state (Hobbs 1981).
This species is threatened in Georgia by land uses within its range that could alter hydrology and water quality. Introduction of non-native species is a threat to all native crayfishes.
This species is common and widespread in Georgia and is thus considered secure.
Conserving populations of the Eastern Red Swamp Crayfish will require general watershed level protection measures, including the protection of riparian zones, control of sediment and nutrient runoff from farms and construction sites, and limiting the amount of impervious cover (e.g., pavement) within occupied watersheds. Non-native crayfishes should never be used for bait; instead, anglers should use crayfishes collected from the river system where they will be fishing. Unused bait of any kind should not be released back into Georgia waters.
Hobbs, H.H., Jr. 1981. The crayfishes of Georgia. Smithsonian Contributions to Zoology 318:1–549.
Hobbs, H.H., Jr. 1989. An illustrated checklist of the American crayfishes (Decapoda: Astacidae, Cambaridae, and Parastacidae). Smithsonian Contributions to Zoology 480:1–236.
Taylor, C.A., G.A. Schuster, J.E. Cooper, R.J. DiStefano, A.G. Eversole, P. Hamr, H.H. Hobbs III, H.W. Robison, C.E. Skelton, and R.F. Thoma. 2007. A reassessment of the conservation status of crayfishes of the United States and Canada after 10+ years of increased awareness. Fisheries 32:372–389.
Christopher E. Skelton
C. Skelton, September 2012: original account
C. Skelton, March 2019: general update of account.
D.Weiler, September 2019: photo added