A comparison of proteases extracted from <em>Caligus elongatus</em> (Nordmann, 1832) and <em>Lepeophtheirus salmonis</em> (Kroyer, 1838).

This article presents a comparison of proteases extracted from Caligus elongatus and Lepeophtheirus sabnonis. Both Caligus elongatus and Lepeophtheirus sabnonis are parasitic caligid copepods that inflict considerable damage on farmed salmonids in sea water. Both species, as preadults and adults, are mobile over the skin of their hosts and graze upon the mucus and epithelial cells. However, if the intensity of infestation is high, the epithelial browsing can result in deeper damage to the skin leading to extensive ulceration. Control samples were incubated with the same volume of isopropanol. Low molecular weight standard proteins were obtained from Pharmacia.