Here's the head of a sea lamprey which migrated up the Delaware River to spawn. From the West Branch of the Delaware River in New York.
See many more fly fishing, trout stream, and stream insect pictures on the Troutnut.com homepage and discussion forum.

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Here's the head of a sea lamprey which migrated up the Delaware River to spawn.

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Troutnut.com is a collection of pictures and information about fly fishing. Fly fishermen, fly tiers, and trout enthusiasts of all stripes can learn more about life beneath the surface of trout streams, as well as how to better imitate aquatic insects with artificial flies to catch trout. There are aquatic insect pictures, underwater pictures, landscape pictures, and a comprehensive reference to the common names of trout stream insects.