Marine Institute Open Access Repository >
Marine Institute Community of Research Publications >
Irish Fisheries Leaflets >
Irish Fisheries Leaflets >
Please use this identifier to cite or link to this item:
|Title: ||National Survey of the Sea Lice (Lepeophtheirus salmonis Krøyer and Caligus elongates Nordmann) on Fish Farms in Ireland - 2003|
|Authors: ||O'Donohoe, P|
|Issue Date: ||2004|
|Publisher: ||Marine Institute|
|Citation: ||O'Donohoe, P., Kennedy, S., Kane, F., Naughton, O., Tierney, D., Copley, L. & Jackson, D., "National Survey of the Sea Lice (Lepeophtheirus salmonis Krøyer and Caligus elongates Nordmann) on Fish Farms in Ireland - 2003", Fishery Leaflet, Marine Institute 2004|
|Series/Report no.: ||Fishery Leaflet;184|
|Abstract: ||Sea lice are regarded as having the most commercially damaging effect on cultured salmon in the world with major economic losses to the fish farming community resulting per annum (Bristow and Berland, 1991; Jackson and Costello, 1991). They affect salmon in a variety of ways; by reducing fish growth; by causing loss of scales, which leaves the fish open to secondary infections (Wootten et al., 1982); and by damaging the fish, which reduces its marketability. The two species of sea lice found on cultured salmonids in Ireland are Caligus elongatus Nordmann, a species of parasite that infests over 80 different types of marine fish, and Lepeophtheirus salmanis Kroyer, which infests only salmon and other salmonids.
L. salmonis is regarded as the more serious parasite of the two species and has been found to occur most frequently on farmed salmon (Jackson and Minchin, 1992). Most of the damage caused by these parasites is thought to be mechanical, carried out during the course of attachment and feeding (Kabata, 1974; Brandal et al., 1976; Jones et al., 1990). Inflammation and hyperplasia (enlargement caused by an abnormal increase in the number of cells in an organ or tissue) have been recorded in Atlantic salmon in response to infections with L. salmonis (Jones et al., 1990; Jonsdottir et al., 1992; Nolan et al., 2000). Increases in stress hormones caused by sea lice infestations have been suggested to increase the susceptibility of fish to infectious diseases (MacKinnon, 1998). Severe erosion around the head caused by heavy infestations of L. salmonis has been recorded previously (Pike, 1989; Berland, 1993). This is thought to occur because of the rich supply of mucus secreted by mucous cell-lined ducts in that region (Nolan et al., 1999). In experimental and field investigations carried out in Norway heavy infestation was found to cause fish mortalities (Finstad et al., 2000).|
|Appears in Collections:||Irish Fisheries Leaflets|
Items in the Marine Institute Open Access Repository are protected by copyright, with all rights reserved, unless otherwise indicated.