With the objective of research the presence of helminthes, their frequencies and
infection intensity in musculature and abdominal serose of commercial fishes process in
Belém, State of Pará, Amazonian Region, it were examined 175 fish specimens belonging to
four species caught in the North Coast of Brazil, among which three sea species Sciaenidae -
Cynoscion acoupa, Cynoscion virescens and Macrodon ancylodon, and the estuarine catfish
Ariidae - Arius proops. The fishes was measuring as for standard length, analyzing the
musculature and adjacent abdominal serose in a “candling table” after filleted the samples.
Just was founded parasitism for plerocercoids of cestode Trypanorhynch. The blastocysts
captured were observed among of morphology and size, the same was mading with the
scolices when liberated. All the species of fishes studied were parasitizing, with 16% in M.
ancylodon, 77,78% in A. proops, 79,17% in C. virescens and 82% in C. acoupa, reaching an
overall frequency to 61,71% (108 specimens) and an intensity of infection average about six
blastocysts per fish. The parasitizing species, as well as frequency of infection, were as
follows: Callitetrarhynchus gracilis (52,57%), Pterobothrium heteracanthum (13,71%),
Poecilancistrium caryophyllum (12%) e Pterobothrium crassicolle (3,43%). Between infested
fishes, 85,19% presented occurrence in the abdominal region (abdominal musculature and
serose) and 81,48% muscular involvement (abdominal e body musculature). The specie P.
heteracanthum showed preference to infect the abdominal region of fishes and the specie P.
caryophyllum the musculature. There was significative association (P < 0,01) between the
species of fishes analyzed and the frequency of infection.
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