Control of the sea louse Caligus rogercresseyi in the Chilean salmonid industry is reliant on chemical treatments. Azamethiphos was. PDF | On Jan 1, , J F Burka and others published 22 Lepeophtheirus salmonis and Caligus rogercresseyi. One of the pathogens causing the highest economic impacts on the Chilean salmon industry is the ectoparasite copepod Caligus rogercresseyi.
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Two egg strings of to eggs L. The family Caligidae is estimated to contain around species in 37 genera.
The source of L. Whether stressed fish are particularly prone to infestation is unclear. Walter TC, Boxshall G, eds.
WoRMS – World Register of Marine Species – Caligus rogercresseyi Boxshall & Bravo,
Little evidence exists of host tissue responses in Atlantic salmon at the sites of feeding and attachment, regardless of the development stage. With exception of a short period during the moult, the preadult and adult stages are rogercresswyi on the fish, and in some cases, can move between host fish.
Smolt get infected with sea lice larvae, or even possibly adults, when they enter the estuaries in the spring. The second antennae and oral appendages are modified to assist in holding the parasite on the fish. Inreduced sensitivity to azamethiphos was detected in the Los Lagos Region using bioassays. Sea lice continue their development through three additional chalimus stages each separated by a moult.
There are roughly species in 37 genera include around Lepeophtheirus and Caligus species. Several antiparasitic drugs have been developed for control purposes. The major advantage to bath treatments is that all the fish will be treated equally, in contrast to in-feed treatments where amount of drug ingested can vary due to a number of reasons.
Mutations in the AChE gene are the main cause of organophosphate resistance in arthropods, including other sea lice. In other projects Calihus Commons Wikispecies.
Sea louse – Wikipedia
Samples of adult male and female C. The function of AChE1b is unknown, but evidence points to a scavenger role. Organophosphates are acetylcholinesterase inhibitors and cause excitatory paralysis leading to death of sea lice when given as a bath treatment.
Many sea louse species are specific rkgercresseyi regard to host genera, for example L. The genera Lepeophtheirus and Caligus parasitize marine fish, in particular those species that have been recorded on farmed salmon. How planktonic stages of sea lice disperse and find new hosts is still not completely known. How sea lice distribute between fish in the wild also is not known.
Resistance to organophosphates began to develop in Norway in the mid s, apparently due to acetylcholinesterases being altered due to mutation. Bulletin of the European Association of Fish Pathologists.
Diseases of Aquatic Organisms. The range of therapeutants for farmed fish was limited, often due to regulatory processing limitations.
Twenty-four hour exposure bioassays with azamethiphos were performed to select sensitive and resistant lice.
Sea lice die and fall off anadromous fish such as salmonids when they return to fresh water. Retrieved March 26, Good husbandry techniques include fallowing, removal of dead and sick fish, prevention of net fouling, etc. Lockyer; Eric Verspoor; Christopher J.
Cleaner fishrogercrrsseyi five species of wrasse Labridaeare used on fish farms in Norway and to a lesser extent in Scotland, Shetland and Ireland.
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Recent evidence is also emerging that L. Cypermethrin Excis, Betamax and deltamethrin Alphamax are the two rogercresseyl commonly used to control sea lice. Since the volume of water is imprecise, the required concentration is not guaranteed. Preadult and adult sea lice, especially gravid females, are aggressive feeders, in some cases feeding calkgus blood in addition to tissue and mucus.
The body consists of four regions: In-feed treatments are easier to administer and pose less environmental risk than bath treatments.
Retrieved January 15, Wikispecies has information related to Caligidae. All drugs used have been assessed for environmental impact and risks.
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