Aquaculture Research 35 8 764 772 BLACKWELL PUBLISHING LTD OXFORD; 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND

Most lice infestations on salmon farmed in the North Atlantic are attributed to Caligus elongatus and Lepeophtheirus salmonis. This study reports findings from time-series analysis conducted on observations of the lesser-studied C. elongatus, in four farms on the west coast of Scotland over the period 1996-2000. Least-squares and Poisson regression techniques were applied to one individual site and to the aggregated data of four sites. Models were fitted and tested for goodness of fit using appropriate statistical methods. Findings indicate that infestation levels are highly seasonal with rapidly increasing numbers after week 22 of the year followed by a steady decline from week 40. Abundance is much lower in the second year of the production cycle than the first. Neither of the models indicated that treatment application has a significant effect on C. elongatus infestations.CR: BOXASPEN K, 1997, ICES J MAR SCI, V54, P1144 BOXSHALL GA, 1974, PARASITOLOGY, V69, P361 BRON JE, 1993, J FISH DIS, V16, P487 BRON JE, 1993, PATHOGENS WILD FARME, P263 BUSH AO, 1997, J PARASITOL, V83, P575 COURTIN F, 2000, PREV VET MED, V43, P13 GRANT AN, 1993, PATHOGENS WILD FARME, P255 HEINZL H, 2003, COMPUT STAT DATA AN, V44, P253, DOI 10.1016/S0167-9473(03)00062-8 JACKSON D, 2000, CONTRIB ZOOL, V69, P65 JOHNSON SC, 1991, J MAR BIOL ASSOC UK, V71, P425 KABATA Z, 1979, PARASITIC COPEPODA B MCCULLAGH P, 1983, GEN LINEAR MODELS MITTLBOCK M, 2000, COMPUT STAT DATA AN, V34, P461 PIASECKI W, 1993, P 1 EUR CRUST C PAR PIASECKI W, 1996, CAN J ZOOL, V74, P1459 RAE GH, 2002, PEST MANAG SCI, V58, P515 RAWLINGS JO, 1988, APPL REGRESSION ANAL REVIE CW, 2002, J FISH DIS, V23, P309 REVIE CW, 2002, PEST MANAG SCI, V58, P576 REVIE CW, 2002, VET REC, V151, P753 REVIE CW, 2003, DIS AQUAT ORGAN, V57, P85 SCHRAM TA, 1998, ICES J MAR SCI, V55, P163 TREASURER JW, 2000, AQUACULTURE, V187, P247 TULLY O, 1989, J MAR BIOL ASSOC UK, V69, P279 TULLY O, 1992, INVERTEBR REPROD DEV, V22, P91 WARD MP, 1996, PREV VET MED, V28, P57 WOOTEN R, 1982, P ROY SOC EDINB B, V81, P18