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Prevalence, intensity and abundance of Rhadinorhynchus pristis [Acanthocephala, Rhadinorhynchidae] in chub mackerel, Scomber japonicus [Pisces, Scombridae] from Madeira Island

100%

Costa G., Pontes T., Rego A. A.

Acta Parasitologica

2004

tom 49

nr 1

Males and females of the acanthocephalan Rhadinorhynchus pristis Rudolphi, 1802, were found in the intestine of several chub mackerels, Scomber japonicus Houttuyn, 1782, caught at Madeira, Atlantic Ocean. Prevalence of infection was 50.6% in 1999 (n = 154) and 60.0% in 2001 (n = 30) and intensity of infection was 3.19 ± 3.84 and 3.056 ± 2.92, respectively. R. pristis showed an aggregated distribution as indicated by the aggregation and discrepancy indices 0.72 and 0.627, respectively. Comparisons of prevalences by Fisher's exact test showed no significant differences between the two samples and no significant relationship between abundance of infection and fish length. The presence of R. pristis in S. japonicus from Madeiran waters provides further evidence of relationships between the Madeiran parasite fauna and those of the western tropical Atlantic and the Mediterranean-Atlantic regions.

Anisakid nematodes of the blackspot seabream, Pagellus bogaraveo, from Madeiran waters, Portugal

100%

Costa G., Madeira A., Pontes T., D'Amelio S.

Acta Parasitologica

2004

tom 49

nr 2

Two hundred and eighty-one anisakid larvae were found encapsulated in stomachs and mesenteries of 69 blackspot seabreams, Pagellus bogaraveo from Madeiran waters. Ninety-four larvae were identified as Anisakis simplex s.s., Anisakis pegreffii (Type I larvae), Anisakis simplex s.l. (Type II larvae) and Hysterothylacium sp. Prevalence of infection with anisakids increased with host length from 81.3% to a maximum of 96.3%. Mean intensity ranged from 3.5 (at length class 25 cm) to 4.8 (at length class 35 cm), with the majority of fish infected with only 1 or 2 parasites. A positive but not significant correlation was found between intensity and length (rₛ = 0.0419, p = 0.717). The high values of prevalence and low values of intensity may indicate that the anisakid larvae are dispersed within their hosts. No particular histopathological lesions were found associated with the presence of the nematodes, corroborated by a positive but not significant correlation that was found between intensity and condition factor (rₛ = 0.242, p = 0.035).

Ograniczanie wyników

2 Acta Parasitologica

2 Costa G.

2 Pontes T.

1 D'Amelio S.

1 Madeira A.

1 Rego A. A.

2 2004

Wyniki wyszukiwania

Prevalence, intensity and abundance of Rhadinorhynchus pristis [Acanthocephala, Rhadinorhynchidae] in chub mackerel, Scomber japonicus [Pisces, Scombridae] from Madeira Island

Anisakid nematodes of the blackspot seabream, Pagellus bogaraveo, from Madeiran waters, Portugal