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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 ]
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.
Troctolite – Igneous rock – A plutonic ultramafic rock containing olivine, pyroxene and plagioclase; Trondhjemite – Light-colored intrusive igneous rock – A form of tonalite where plagioclase-group feldspar is oligoclase; Tuff – Rock consolidated from volcanic ash; Vitrophyre – Glassy volcanic rock - Glassy igneous rock with phenocrysts
The brook lamprey is a common, non-parasitic species that is endemic to Europe. [1] Adult brook lampreys measure from 12 to 14 cm (4.7 to 5.5 in). The body is highly elongated and dark blue or greenish above, lightening to yellowish off-white on the sides and pure white on the ventral side.
Mordacia praecox, the Australian brook lamprey or nonparasitic lamprey, is a freshwater species of southern topeyed lamprey that occurs in south-eastern Australia. It has a thin eel-like body around 12 to 15 cm (4.7 to 5.9 in) long, with two low dorsal fins on the back half. The skin is dark blue above and grey below.
Spawning occurs when a female moves over a nest and attaches to a rock. Spawning pairs stimulate other pairs to begin spawning. The mountain brook lamprey lives up to five or six years, and usually dies after spawning. [5] The post-embryonic life cycle of all lampreys includes a distinct larval or ammocoete and adult period.
Each larva that grows into a juvenile sea lamprey will migrate into Lake Michigan and can kill 40 pounds of fish in its 12- to 18-month feeding period.
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 .