The number of holothurian (/ ˌ h ɒ l ə ˈ θj ʊər i ə n, ˌ h oʊ-/) species worldwide is about 1,717 with the greatest number being in the Asia Pacific region. Relationship: Commensalism "The pearlfish uses the sea cucumber for a hide-out from predators. The pearlfish is a long, slim fish. The pearlfish will live in the sea cucumber’s anus, backing into the … Presumably it’s not ideal to have a fish up your butt, but it could be worse. (Other pearlfish take the opposite approach, reversing in tail-first.) Pearlfish are marine fish in the ray-finned fish family Carapidae.Pearlfishes inhabit the tropical waters of the Atlantic, Indian, and Pacific Oceans at depths to 2,000 m (6,600 ft), along oceanic shelves and slopes. Definition of pearlfish in the Definitions.net dictionary. Pearlfish are typically found alone, and adults have been known to kill rivals that try to infiltrate the same host. “Sea cucumbers are [the pearlfish’s] most infamous hosts,” National Geographic adds. In some cases though, you can get fish that like to eat planaria. They are slender, elongated fish with no scales, translucent bodies, and dorsal fin rays which are shorter than their anal fin rays. Best Dining in Pearl, Mississippi: See 2,232 Tripadvisor traveler reviews of 81 Pearl restaurants and search by cuisine, price, location, and more. Some pearlfish species are harmless, simply bumming a free room from the sea cucumbers. Some pearlfish have been known to nip at the respiratory system of the sea cucumber, but it does not seem to affect the host in any way. Click here, to see a pearlfish swimming into a host. Meaning of pearlfish. Oh so much worse… as other pearlfish species eat the sea cucumber’s gonads from the inside. Sea cucumbers are echinoderms from the class Holothuroidea.They are marine animals with a leathery skin and an elongated body containing a single, branched gonad.Sea cucumbers are found on the sea floor worldwide. Why not take a look at some of the work Pearlfisher has carried out to help give a range of world-class brands iconic status. Information and translations of pearlfish in the most comprehensive dictionary definitions resource on … What does pearlfish mean? Fish That Eat Planaria. (Pun intended). The following are our top picks for aquarium fish that will eat … And, naturally, pearlfish can occasionally be found within sea cucumbers. As you can see, Carapidae is a fascinating fish family because of their morphology and behavior. They can also help to keep the planaria numbers low in your tank. Most sea cucumbers will expel what is known as cuvierian tubes (sections of the respiratory tree) when they are … Since it is a worm, most fish that eat live foods do not mind eating them. “Having found [an example] by following its smell, a pearlfish will dive into the anus headfirst. They have no scales but they do have long fins that run along the length of their bodies. 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