Official Louisiana State Websites use .la.gov 
Secure .gov websites use HTTPS The Louisiana Department of Wildlife and Fisheries is proud to introduce its new website, thoughtfully designed to present information in a clearer, more intuitive way and help users quickly find what they need. Explore the features of the new site to see what’s improved.
Diamond-backed Watersnake
Scientific Name: Nerodia rhombifer
Also Know As: Fish Snake
Aquatic and Terrestrial
Native
Snakes
Nonvenomous
A medium-large snake- 18 to 65 inches long. Pale gray-brown or tan above with dark brown or black crossbars alternating on the back and sides. Dark markings are smaller that the spaces between. Underside is yellowish with small dark markings. Scales are keeled (ridged) in 25 to 27 rows.
Range and Habitat
Found in and around freshwater lakes, ponds, marshes, swamps, and large streams and rivers, especially in the low country. Observed statewide except for in brackish and salt marshes of the coastal regions.
Behavior
Often observed basking on vegetation overhanging water into which the snakes drop when approached. Feed almost exclusively on fish with adult prey being primarily catfish. May form aggregations near shorelines during the spring and often mistaken for a "nest of water moccasins". Give birth to 6 to 62 young.
Population Status
Populations are considered stable within the state.