ISSN:
1573-143X
Keywords:
Areas of larval production
;
Distance from farm
;
Infection levels
;
Lice population structure
;
Sea lice (Lepeophtheirus salmonis)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Approximately 300 salmon smolts were stocked in each of four cages moored at various distances between an Atlantic salmon farm and a river system in Killary Harbour on the West Coast of Ireland. Samples of fish were taken from each of the cages on three occasions and examined for the presence of sea lice (Lepeophtheirus salmonis). Results from one-way ANOVA tests and a multiple comparison of the means of infection levels in the cages indicated that there was a significant difference between the infection levels in the cages on each of the sampling dates. Cage 1, positioned nearest the river, exhibited the highest levels of infection on the first sampling date and was highly significantly different (p ≤ 0.001) from the other three cages which showed no significant difference between each other. This situation was again repeated on the second sampling date. On the final sampling date, cage 4, positioned nearest the salmon farm, was highly significantly different (p ≤ 0.001) from the other three cages; cage 1 was significantly different (p ≤ 0.05) from cages 2 and 3 which showed no significant difference from each other. The population structure of the lice recovered from the smolts indicated that the lice settled in pulses rather than continuously over the trial period. The results are discussed in relation to the hydrography of Killary Harbour, the output of lice larvae from the farm, the impact that these may have on infestations in the inner area of Killary and probable areas of lice larval production.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00121626
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