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The lamprey's light-colored underside and darker back allow it to blend in when viewed from above or below, an example of countershading. Many lampreys exhibit countershading, a form of camouflage. [43]
Lampetra ayresii is a species of lamprey in the family Petromyzontidae.It is also called the river lamprey or western river lamprey.It is found in the eastern Pacific, specifically from Tee Harbor, Juneau in Alaska to the Sacramento–San Joaquin drainage in California, USA.
The silver lamprey is an eel-like fish with an attenuate body composed of 49–52 clearly defined segments (i.e. myomeres, between the last gill slit and the anus).Silver lampreys possess a cartilaginous skeleton, and adults generally grow to a length of 12 inches and are silvery or bluish in color when spawning.
Ammocoetes have pigmented eye spots located in the head that can detect light and dark. After metamorphosis from the ammocoete into the juvenile stage, the lamprey becomes a golden color with yellow-tinged fins. Teeth (often used to identify lamprey to species) develop on the oral disk, and the eyes develop from the eye spots at metamorphosis.
This lamprey is usually about 13 to 32 centimetres (5.1 to 12.6 in) long, but specimens have been known to reach 63 centimetres (25 in) and 200 grams (7.1 oz) in weight. Non-anadromous individuals are rarely over 18 centimetres (7.1 in) long. [4] It is brown, gray, or olive in color with a paler belly. There are two dorsal fins located near the ...
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Lampetra zanandreai, the Lombardy lamprey, is a species of lamprey in the Petromyzontidae family. It is found in Croatia , Italy , and Slovenia . Its natural habitats are rivers and freshwater springs .
Eudontomyzon danfordi, the Carpathian brook lamprey or Danube lamprey, is a species of lamprey in the family Petromyzontidae. It is found in Austria , Bosnia and Herzegovina , Bulgaria , Croatia , Czech Republic , Hungary , Moldova , Romania , Serbia , Montenegro , Slovakia , and Ukraine .