Skip to Main Content Skip to Main Navigation
Join the Griffin's Guide HUNTING newsletter

Get weekly news, tips and photos from the world of hunting.
[contact-form-7 id="35884" title="GG Email"]
No Thanks!

Invasive Species

Brought to you by:

Northern Snakehead (Mature)

Northern snakehead are identified by a long dorsal (back) fin and anal fin, a rounded tail, and a large mouth reaching beyond the eye with many, sharp teeth. The young are generally lighter tan or yellowish in color.


Northern Snakehead (Juvenile)


Bowfin (Native)

Bowfin, a native species, is sometimes mistaken for snakeheads but has a short anal fin. Please return bowfin to the water.


Flathead Catfish

Flathead catfish are most easily recognized by their broad, flat head, brown mottled coloration and lower jaw which sticks out further than the upper.


Blue Catfish & Channel Catfish

The invasive blue catfish (on top), and a channel catfish (lower) can be differentiated by spreading out the anal fin and looking for a straight or lobed appearance.


all visible aquatic plants from watercraft and trailers as well as waders and boots.

equipment (boat bilge, ballast tanks, bait containers, motor) before leaving any water access area.

of unwanted live bait (minnows, worms) in the trash.

In most cases, new fish species that are introduced into our waters don’t survive or present a problem. But some may flourish and potentially cause ecological or economic harm. When there is harm, these species are called invasive. Currently, we have several species in our waters that we are tracking as potentially invasive and the department could use your help to document new sites. If you catch something you feel is unusual, please call 302-739-9914. If you catch a Northern snakehead, blue catfish or flathead catfish please do not return it to the water, but kill it and contact us. Document the catch by freezing it or taking a good photo.


Red Swamp Crayfish (Procambarus Clarkii) are an invasive species. They have distinctive red bumps on the claws and often migrate over land during damp weather.

Regulations in red are new this year.

Purple text indicates an important note.

Return to the home page
Brought to you by:
Conservation Partner Advertisements: The Delaware Department of Natural Resources and Environmental Control: Division of Fish and Wildlife allows appropriate advertising in its annual regulation guides in print and online, in order to defray or eliminate expenses to the state, and support enhanced communications with Delaware Department of Natural Resources and Environmental Control: Division of Fish and Wildlife Constituents. Through a unique partnership with J.F.Griffin Publishing, LLC &, ‘Conservation Partners’ have been established that pay for advertising in support of the regulations both in print and online. The Delaware Department of Natural Resources and Environmental Control: Division of Fish and Wildlife neither endorses products or services listed or claims made; nor accepts any liability arising from the use of products or services listed. Advertisers interested in the Conservation Partners program should contact J.F.Griffin/ directly at 413-884-1001,
JF Griffin Media
J.F. Griffin Media reaches 9,000,000 sportsmen every year through our print and digital publications. We produce 30 hunting and fishing regulation guides for 15 state agencies. For advertising information, please visit: