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Marine worms are known to inhabit many different environments, having been found in both fresh and saltwater habitats globally. [citation needed] Some marine worms are tube worms, of which the giant tube worm lives in waters near underwater volcanoes and can withstand temperatures up to 90 °C (194 °F). They share this space with fellow ...
Monogenea are small parasitic flatworms mainly found on skin or gills of fish. They are rarely longer than about 2 cm. A few species infecting certain marine fish are larger, and marine forms are generally larger than those found on freshwater hosts. Monogenea are often capable of dramatically elongating and shortening as they move.
Some marine worms occupy a small variety of parasitic niches, living inside the bodies of other animals, while others live more freely in the marine environment or by burrowing underground. Different groups of marine worms are related only distantly, so they are found in several different phyla such as the Annelida (segmented worms ...
Lernaeocera branchialis, sometimes called cod worm, is a parasite of marine fish, found mainly in the North Atlantic. [2] It is a marine copepod which starts life as a small pelagic crustacean larva .
The top of the tube can be closed by an operculum formed by several rings of bristles on the head of the worm. The head also bears several fine feeding tentacles and a pair of small palps. The thoracic section of the body has 3 or 4 segments with paddle-like capillary bristles.
The nauplii will go through three stages before molting into copepodids, which associate with fish gills. [2] After a further five stages and mating, the male leaves the host and dies, while the female transitions into the anchored stage (may move to different fish host). [2] An anchor worm Lernaea sp. parasite on a Murray cod
Ragworms are predominantly marine organisms that may occasionally swim upstream to rivers and even climb to land (for example Lycastopsis catarractarum). They are commonly found in all water depths, foraging in seaweeds, hiding under rocks or burrowing in sand or mud. Ragworms are mainly omnivorous but many are active carnivores.
The infected fish also becomes lethargic, swims near the surface, and its appetite decreases. [10] Additionally the infected fish may hold its gill covers open and scratch its gills on rocks. [14] In severe infections, Dactylogyrus species can cause hemorrhaging and metaplasia of the gills which can lead to secondary bacterial infections and ...