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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 90, No. 3, 1995, pp. 319-324
Bioline Code: oc95063
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 90, No. 3, 1995, pp. 319-324

 en Occurrence of Sciadicleithrum mexicanurn Kritsky, Vidal-Martinez et Rodriguez-Canul, 1994 (Monogenea: Dactylogyridae) in the Cichlid Cichlasorna urophthalrnus from a Flooded Quarry in Yucatan, Mexico
EF Mendoza-Franco; V Vidal-Martinez; R Sima-Alvarez; R Rodriguez-Canul; C Vivas-Rodriguez & T Scholz

Abstract

Cichlids, Cichlasoma urophthalmus, collected in a flooded
quarry in the Yucatan Peninsula, Mexico, from January through
June 1992, had high levels of infection with the
ancyrocephaline Sciadicleithrum mexicanum (Monogenea:
Dactylogyridae) in all monthly samples. Neither occurrence nor
maturation of the worms exhibited any pronounced monthly
fluctuation. The infection rate was found to be sizedependent,
greater in longer risk The worms occurred on primary lamellae
of gill filaments of all arches, with lower numbers of
parasites attached to the fourth gill arch. Otherwise, there
was no significant site preference of worms. Only nanor
histopathological changes were found at the sites of
attachment, and these were restricted to the epithelial cells
of the primry lamellae of the gill filaments. The lack of
seasonal periodicity in lhis tropical monogenean is compared
to seasonal cycles typical of temperate species.

Keywords
Monogenea - occurrence - maturation - Ancyrocephalinae - cichlid fishes - Mexico

 
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