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The majority of leeches live in freshwater habitats, while some species can be found in terrestrial or marine environments. The best-known species, such as the medicinal leech, Hirudo medicinalis , are hematophagous , attaching themselves to a host with a sucker and feeding on blood, having first secreted the peptide hirudin to prevent the ...
Hirudiculture is the culture, or farming, of leeches in both natural and artificial environments. This practice drew the attention of Parisian savants and members of the French Société Zoologique d'Acclimitation in the mid-to-late 19th century as a part of a larger interest in the culture of fish and oysters. [1]
Leeches are hermaphrodites, and mating may take place on or off the fish host, but in either case, the cocoon, usually containing a single egg, is deposited elsewhere, usually stuck to a stone or piece of vegetation, or even to the carapace of a crustacean. When the egg hatches, the juvenile leech has about a week to find a suitable fish host ...
Erpobdella obscura is a freshwater ribbon leech common in North America. It is a relatively large leech and is commonly used as bait by anglers for walleye and other sport fish. In Minnesota, live bait dealers annually harvest over 45,000 kg of bait-leeches, raising concerns of over-harvest. [3]
Hirudinea, whose name means "leech-shaped" and whose best known members are leeches. [8] Marine species are mostly blood-sucking parasites, mainly on fish, while most freshwater species are predators. [13] They have suckers at both ends of their bodies, and use these to move rather like inchworms. [15]
Back of Macrobdella decora – note the row of orange dots down the middle and the two sets of black ones on the sides.. Macrobdella decora is a medium-sized leech, growing between 5 and 8.5 cm (2.0 and 3.3 in) long, and weighing from 1.48 to 3.69 grams (0.052 to 0.130 oz).
Leeches are hermaphrodite and pair up to impregnate each other by hypodermic injection. [6] The eggs are laid in dark brown cocoons which are cemented to submerged objects. After the eggs hatch, the juvenile leeches must seek out suitable fish hosts. The whole life cycle takes about four weeks to complete. [2]
This leech can go for up to six months in between blood meals. During this time, erythrocytes in the crop are slowly transported to the intestinum to be lysed so their nutrients can be absorbed. [4] Host animals include mammals, fish, water birds and amphibians. Amphibians such as tadpoles and juvenile hosts are important hosts for juvenile ...
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