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Once C. exigua replaces the tongue, some feed on the host's blood and many others feed on fish mucus. [clarification needed] In the event of the death of the host fish, C. exigua, after some time, detaches itself from the tongue stub and leaves the fish's oral cavity. It can then be seen clinging to its head or body externally.
Cartilaginous fish, such as sharks, do not have any of the bones found in the lower jaw of other vertebrates. Instead, their lower jaw is composed of a cartilaginous structure homologous with the Meckel's cartilage of other groups. This also remains a significant element of the jaw in some primitive bony fish, such as sturgeons. [11]
When they have found the correct species of fish for their adult development, they attach more permanently. As adults, most species require a particular host species, and are also site-specific. Locations for attachment chosen by different species of parasite include the skin, fins, gills, and mouth, while some species bore into muscle.
A preserved tongue sole at a lab. Tonguefishes are flatfish in the family Cynoglossidae. They are distinguished by the presence of a long hook on the snout overhanging the mouth, and the absence of pectoral fins. Their eyes are both on the left side of their bodies, which also lack a pelvic fin. [2]
Most fish species with pharyngeal teeth do not have extendable pharyngeal jaws. A particularly notable exception is the highly mobile pharyngeal jaw of the moray eels.These are possibly a response to their inability to swallow as other fishes do by creating a negative pressure in the mouth, perhaps induced by their restricted environmental niche (burrows) or in the air in the intertidal zone. [10]
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Still, Zangroniz said if a person has pet fish and notices they're floating in the tank or swimming erratically, they can try to remove variables that draw out stress from the fish or seek medical ...
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