Fróðskaparrit - 01.01.1995, Blaðsíða 105

WHALEWORM IN THE FILLETS OF SAITHE FROM FAROESE WATERS
109
Age (years)
1991
1992
1993
1994 Year
Fig 1. Abdundance (mean number per fish examined) of Anisakis simplex larvae in the flllets of saithe, Pollachius
virens, from Faroese waters 1991-94.
Mynd 1. Tættleiki (miðaltal fyri hvønn kannaðan fisk) av Anisakis simplex ormverum í upsaflaki av Føroya-leiðini
1991-94.
tion of saithe infected, varied from zero to
100 %. The mean values for each year de-
clined from 97 % in 1991, to 67 % in 1994
(Table 1). A tendency of decreasing infec-
tion in the same age-class could also be ob-
served (Table 2). Abundance, expressed as
the mean number of parasites per saithe, in-
cluding uninfected fish, varied between
zero and 27 larvae per fish (Fig.l). The
right and left anterior sections of the ventral
fillet ( A and D) were statistically different
(pcO.OOl and p<0.01, two sample t-test, see
Fig.2 and Table 3). The left fillet contained
62 % and the ventral sections had 95 % of
the total number of larvae found (Fig. 2).
The ventral anterior sections contained 75
% of the nematode larvae in the fillets.
Discussion
Hauksson (1992) investigated a large num-
ber of various fishes from Icelandic waters
for nematodes in all organs and in the mus-
cles. In saithe he found a range of 0-33 A.
simplex larvae per fish, the prevalence was