From 1 to 650 meters.
Habitat: demersal. Lives in coastal waters. Enters river mouths for spawning in spring. Feeds on dead or netted fish but also attach themselves to healthy fish (e.g. bony fish, sharks and even marine mammals) by scraping a hole in their skin and sucking out the blood, body fluids and flesh. An anticoagluant substance prevents the blood of the prey from clotting. The landlocked form is very destructive to freshwater fishes and occasionally annoys bathers by clinging to them.
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