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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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Caligus – Wikipedia

Since the volume of water is imprecise, the required concentration is not guaranteed. Archived from the original PDF on Azamethiphos was introduced inalthough other organophosphates were previously used. Aquaculture Diversity of fish Fish diseases and parasites Fish farming Rogercresseyo management Fisheries science Individual fishing quota Sustainable fishery Overfishing Wild fisheries. World Register of Marine Species. Lepeophtheirus salmonis and various Caligus species are adapted to salt water and are major ectoparasites of farmed and wild Atlantic salmon.

Bay management plans are in place in most fish farming regions to keep sea lice below a level that could lead to health concerns on the farm or affect wild fish in surrounding waters.

Handbook of Environmental Chemistry. It acts like a suction cup in holding the louse on the fish. The present study demonstrates the presence of two types of AChE1 genes in C.

WoRMS – World Register of Marine Species – Caligus rogercresseyi Boxshall & Bravo,

The effect is specific to the parasite since the drugs used are only slowly absorbed by the host and rapidly metabolized once absorbed. How sea lice distribute between fish in the wild also is not known. Lowry; Miguel Alonso; Roger N. Diseases and parasites in cod Diseases and parasites in salmon Disease in ornamental fish List of aquarium diseases.


Sea lice die and fall off anadromous fish such as salmonids when they return to fresh water. Retrieved September 11, Two published studies have tested vaccine candidate antigens against salmon lice, which resulted in a reduced infection rate Grayson et al.

Teflubenzuron, the active agent in the formulation Calicide, [64] is a chitin synthesis inhibitor and prevents moulting.

Organophosphates are acetylcholinesterase inhibitors and cause excitatory paralysis leading to death of sea lice when given as a bath treatment.

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Once attached to the host, caligys copepodid stage begins feeding and begins to develop into the first chalimus stage. Retrieved from ” https: The function of AChE1b is unknown, but evidence points to a scavenger role. Lockyer; Eric Verspoor; Christopher J. The naupliar and copepodid stages until they locate a host are nonfeeding and live on endogenous food stores.

Control on salmon farms. World of Copepods database. Walter TC, Boxshall G, eds.

Sea-lice infection causes a generalized chronic stress response in fish since feeding and attachment cause changes in the mucus consistency and damage the epithelium resulting in loss of blood and fluids, electrolyte changes, and cortisol release.


The copepodid stage is the infectious stage and it searches for an appropriate host, likely by chemo- and mechanosensory clues. The second pair of antennae is rogercrezseyi used by males to grasp the female during copulation. Most understanding of the biology of sea lice, other than the early morphological studies, is based on laboratory studies designed to understand issues associated with sea lice infecting rogercredseyi on salmon farms.

Control of the sea louse Caligus rogercresseyi in the Chilean salmonid industry is reliant on chemical treatments. Information on sea lice biology and interactions with wild fish is sparse in most areas with a long-term history of open net-cage development, since understanding background levels of sea lice and transfer mechanisms have rarely been a condition of tenure license for farm operators.

Two egg strings of to eggs L. Branchiuransfamily Argulidae, order Arguloida are known as fish lice and parasitize fish in freshwater.

Retrieved 4 March With exception of a short period during the moult, the preadult and adult stages are mobile on the caligud, and in some cases, can move between host fish.