Fauna helmintologica das especies amazonicas de peixes (Cichla monoculus e Brycon amazonicus) introduzidas nas lagoas da Fazenda Rio das Pedras, Campinas, SP / Helminthological fauna of amazon fish species (Cichla monoculus e Brycon amazonicus) introduced in two lakes of "Rio das Pedras" Farm, Campinas, São Paulo, Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Samples of tucunaré (Cichla monoculus) and matrinxã (Brycon amazonicus) were collected biweekly in two lakes of Rio das Pedras farm, Campinas - SP, from June 2005 to September 2006 with the objective of researching the helminthological fauna of the Amazonian species introduced at these ponds. A total of 38 tucunarés and 16 matrinxãs were collected, taken to the Laboratory of Helminthology, Parasitology Department, Biology Institute, UNICAMP, where we made the biometry and sexed the fish and analyzed the organs, searching for ecto and endoparasites. In the tucunaré, adult cestodes of the species Proteocephalus microscopicus (Prevalence = 76.3%, Intensity of infection = 280.9 worms/fish, Mean Abundance = 214.5) and Bothriocephalus cuspidatus (P= 5.3%, I = 2 worms/fish, MA= 0.10) were found in the intestine. In the eyes we have found larvae of Diplostomum sp. (P= 28.9%, I = 4.36 larvae/fish, MA= 1.26). Monogenean Notozothecium sp. (P= 47.4%, I = 2.33, worms/fish, MA= 1.10) was found parasitizing the gills and the adult nematode Procamallanus (Spirocamallanus) inopinatus (P = 5.3%, I = 1 worms/fish, MA= 0.05) in the intestine. A typical pattern of aggregate distribution were observed in P. microscopicus; the infection intensity and host length were found to be negative correlated, showing that smaller fish housed larger number of P. microscopicus. Between infection intensity and transparency of the water, there was a positive correlation. Negative correlation were found between prevalence of the infection and the water pH for Notozothecium sp, indicating higher presence of monogeneans in more acid water, in Cichla monoculus this parasite can evidences ecological specificity, because this parasite is usual in the Serrasalmidae family. The species Bothriocephalus cuspidatus is not commonly found in the Cichla monoculus, been this one its first appearance. In the matrinxã we have found adult nematodes of the species Procamallanus (Spirocamallanus) inopinatus (P = 56.3%, I = 1.44 worms/fish, MA= 0.81) in the intestine, a commom nematode for this specie and unidentified monogeneans in the gills.

ASSUNTO(S)

helminto fishes brycon amazonicus cichla monoculus brycon amazonicus helminths peixes - amazonas cichla monoculus

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