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The lake trout plays a vital role in the Lake Superior ecosystem. The lake trout has traditionally been considered an apex predator, which means that it has no predators. The sea lamprey is an aggressive predator by nature, which gives it a competitive advantage in a lake system where it has no predators and its prey lacks defenses against it.
Hagfish are the only known living animals that have a skull but no vertebral column, although they do have rudimentary vertebrae. [3] Hagfish are marine predators and scavengers [4] who can defend themselves against other larger predators by releasing copious amounts of slime from mucous glands in their skin. [5]
Sea lamprey is the most sought-after species in Portugal and one of only two that can legally bear the commercial name "lamprey" (lampreia): the other one being Lampetra fluviatilis, the European river lamprey, both according to Portaria (Government regulation no. 587/2006, from 22 June).
The lamprey has well-developed eyes, while the hagfish has only primitive eyespots. The hagfish coats itself and carcasses it finds with noxious slime to deter predators, and periodically ties itself into a knot to scrape the slime off. It is the only invertebrate fish and the only animal which has a skull but no vertebral column. [11]
Extinct due to overfishing, predation by the sea lamprey which colonized the lakes in the 1940s, and hybridization with other ciscoes. [89] Deepwater cisco: Coregonus johannae: Lakes Michigan and Huron Last collected in Lake Michigan in 1951, and in Lake Huron in 1952. Extinct due to overfishing, sea lamprey predation, and hybridization with ...
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.
Sea squirts are rounded or cylindrical animals ranging from about 0.5 to 10 cm (0.20 to 3.94 in) in size. One end of the body is always firmly fixed to rock, coral, or some similar solid surface. The lower surface is pitted or ridged, and in some species has root-like extensions that help the animal grip the surface.
The sea cucumber, like other bioluminescent animals, is able to emit light. It uses this effect as an alarm to expose its self and potential predators in times of an attack.