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The northern brook lamprey (Ichthyomonzon fossor) is freshwater fish in the family Petromyzontidae which consists of the various species of jawless fishes.

Description
Northern brook lampreys are jawless fishes, also known as cyclostomes. Northern brook lamprey are considered non-parasitic lamprey. They have poorly developed teeth and a round, disc-like, subterminal mouth, called an oral-disc, for suction. Northern brook lampreys have a single dorsal fin that continues along their entire length until it connects with the caudal fin. This dorsal fin can be notched as well. Their coloration is gray-brown dorsally with a light line down the back and an even lighter ventral side. The length of adult northern brook lampreys does not typically exceed 16 cm and the body is attenuate. While the ammocoetes look similar to the adult lampreys the ammocoetes have a hooded mouth instead of an oral-disc and no eyes.

Geographic range
Northern brook lampreys can be found in most of the Midwest and northeast regions of the United States. They inhabit the Mississippi drainage basin in Wisconsin and the Lake Erie tributary in New York. They can be found in parts of Canada as well.

Habitat
The northern brook lampreys are found in various habitats throughout their lives. Ammocoetes start off their lives burrowed beneath fine sediment or organic matter in quiet waters while the adults live in sand or gravel in swift moving waters. They are typically found in the headwaters of streams that are moderately warm and clean.

Diet
As ammocoetes the northern brook lamprey feed primarily on detritus, algae, diatoms, bacteria, pollen and a host of other microorganisms as they remain burrowed in fine substrate in calm waters. The juveniles and adults do not feed as the juveniles drift for 4-6 months and the adults spawn and die shortly after spawning.

Reproduction and Life Cycle
Spawning occurs around boulders and crevices of large rocks, 3-7 northern brook lamprey will build a nest together and then spawn in groups of 10-30. Once the eggs are fertilized they are often covered and left alone with no parental care given to the young as the lamprey die soon after. Northern brook lampreys begin spawning at 6 years of age once they have reached sexual maturity. Spawning is triggered by the warming of the water in the spring. Males begin building nests and females lay thousands of eggs to combat high mortality rates of young. Once the ammocoetes emerge from the eggs 2 weeks after fertilization the next 5-6 years feeding on algae and bacteria in burrows. They emerge in the fall as non-feeding juveniles after a 2-3 month metamorphosis and drift for 4-6 months until spawning begins. They then become sexually mature adults, partake in spawning and then they die shortly thereafter.

Conservation
Northern brook lamprey populations are decreasing in the great lakes area and the great lakes drainage basin from lampricides, habitat degradation, and added stressors. A study of Pennsylvania streams found that two of the six species of lampreys normally found breeding in the streams were not there. One of the species not found was the northern brook lamprey. It is speculated that the main reason for population decline is due to the presence of sea lamprey and the lampricides used to be rid of them. In Minnesota, northern brook lampreys are considered a special concern species as they are believed to be declining due to lampricide use and habitat degradation. The lampricide treatments are used in response to the invasive species, sea lampreys, that are currently plaguing the great lake region. The increasing populations of sea lampreys and the increasing use of lampricides in response to sea lampreys has had negative impacts on most populations of lampreys, including the northern brook lamprey.