Fróðskaparrit - 01.01.1995, Side 105

Fróðskaparrit - 01.01.1995, Side 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
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