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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Bath treatments are more difficult and rogerfresseyi more manpower to administer, requiring skirts or tarpaulins to be placed around the cages to contain the drug. Lowry; Miguel Alonso; Roger N.

Early findings suggested genetic variation in the susceptibility of Atlantic salmon to Caligus elongatus. Diseases of Aquatic Organisms. Retrieved September 11, Organophosphates are acetylcholinesterase inhibitors and cause excitatory paralysis leading to death of sea lice when given as a bath treatment. Burka; Philip Jewess; K. Dichlorvos was used for many years in Europe and later replaced by azamethiphosthe active ingredient in Salmosan, which is safer for operators to handle.

Sea louse – Wikipedia

Withdrawal times vary with jurisdiction from 68 days in Canada [61] to rogercresseti days in Norway. Journal of Fish Biology. A review and assessment of environmental risk of chemicals used for the treatment of sea lice infestations of cultured salmon.

World of Copepods database. The function of AChE1b is unknown, but evidence points to a scavenger role.

Caligus – Wikipedia

Two egg strings of to eggs L. Amnesic shellfish poisoning Brevetoxin Ciguatera Diarrheal shellfish poisoning Fish kill Neurotoxic shellfish poisoning Paralytic shellfish poisoning Saxitoxin. There are both rogercressey and disadvantages to using bath treatments. The body consists of four regions: Caligidae on threespine stickleback Gasterosteus aculeatus in coastal British Columbia”.


This results in rejection of the parasite within the first week of infection in these species of salmonids. The family Caligidae rofercresseyi estimated to contain around species in 37 genera.

Canadian Journal of Zoology. Resistance has been noted in Chalimus rogercresseyi in Chile and L. The naupliar and copepodid stages until they locate a host are nonfeeding and caligua on endogenous food stores. How sea lice distribute between fish in the wild also is not known. For pruritic dermatitis which is also referred to as “sea lice”, see seabather’s eruption.

Archived from the original PDF on December 14, In the case of Pacific salmon, cohochumand pink salmon Oncorhynchus kisutchO. The effect is specific cxligus the parasite since the drugs used are only slowly absorbed by the host and rapidly metabolized once absorbed.

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A review of current practices and possible environmental effects”. Pacific salmon return to the marine nearshore starting in June, and finish as late as December, dependent upon species and run timing, whereas the smolts typically outmigrate starting in April, and ending in late August, dependent upon species and run timing. Several scientific studies have suggested that caged, farmed salmon harbour lice to a degree that can destroy surrounding wild salmon populations. Cleaner fishincluding five species of wrasse Labridaerogercressei used on fish farms in Norway and to a lesser extent in Scotland, Shetland and Ireland.

It has been used only sparingly in sea lice control, largely due to concerns that it may affect the moult cycle of non-target crustaceansalthough this has not been shown at the concentrations recommended. Technology, Engineering, and Science News. In other projects Wikimedia Commons Wikispecies.

Many sea louse species are specific with callgus to host genera, for example L. One female can produce pairs of egg strings in a lifetime around 7 months. Retrieved January 12, This can decrease salmon immune responses and make them susceptible to other diseases and reduce growth and performance.


Little evidence exists of host tissue responses in Atlantic salmon at the sites of feeding and attachment, regardless of the development stage. Siphonostomatoida Ectoparasites Calius parasites of fish Parasitic crustaceans Veterinary parasitology Aquaculture.

Cypermethrin Excis, Betamax and deltamethrin Alphamax are the two pyrethroids commonly used to control sea lice.

All drugs used have been assessed for environmental impact and risks. Resistance to pyrethroids has been reported in Norway and appears to be due to a mutation leading to a structural change in the sodium channel which prevents pyrethroids from activating the channel. Sea lice have both free-swimming planktonic and parasitic life stages, all separated by moults.

Retrieved from ” https: Good husbandry techniques include fallowing, removal of dead and sick fish, prevention of net fouling, etc. Jones; Kenneth Roercresseyi D. Walter TC, Boxshall G, eds. Archived from the original on Lepeophtheirus salmonis can parasitize other salmonids to varying degrees, including brown trout sea trout: Branchiuransfamily Argulidae, rogerctesseyi Arguloida are known as fish lice and parasitize fish in freshwater.

Sea lice continue their development through three additional chalimus acligus each separated by a moult. Teflubenzuron, the active agent in the formulation Calicide, [64] is a chitin synthesis inhibitor and prevents moulting.