Pacific Lamprey

From the U.S. Geological Survey (USGS):

What looks like the Sarlacc from the “Star Wars” movie is the mouth and teeth of the Pacific lamprey - 

Pacific lampreys are similar in many ways to Pacific salmon. Like salmon, they hatch in streams, migrate to the ocean and then return to streams to spawn and die. Through their migrations they transport nutrients from marine to freshwater systems, helping nourish inland ecosystems. Lampreys are also sacred to Native American tribes and an important traditional food source. Both lampreys and salmon have declined dramatically over the last decades while facing many similar threats. Now northwest tribes are leading the charge to conserve and restore this ecologically and culturally important fish. The USGS supports their effort by providing critical science, much as they have done for salmon over the last 100 years.