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High Infestation by Dawestrema cycloancistrioides in Arapaima gigas Cultured in the Amazon Region, Peru.

Mathews PD, Malheiros AF, Vasquez ND, Chavez MD - J Vet Med (2014)

Bottom Line: The prevalence was 100%.The mean intensity and mean abundance of the parasite were 144.9 of parasites per individual.This study confirms the necessity of constant monitoring of fish in order to reduce fish mortality.

View Article: PubMed Central - PubMed

Affiliation: Department of Parasitology, Institute of Animal Biology, University of Campinas, 13083-862 Campinas, Brazil.

ABSTRACT
The aim of this study was to evaluate the presence of Dawestrema cycloancistrioides in semi-intensive fish farming of fingerlings of Arapaima gigas. Between September and November 2013, 60 individuals of A. gigas born in captivity, were collected in three concrete ponds, from a semi-intensive fish farm in the Peruvian Amazon. For the study of sclerotized structures, parasites were fixed in a solution of ammonium picrate glycerine and mounted in Canada balsam. To visualize internal structures, parasites were fixed in hot formaldehyde solution (4%) for staining with Gomori's trichrome. The parasitic indexes calculated were prevalence, mean intensity, and mean abundance. This study identified a high infestation of a monogenean D. cycloancistrioides in gills of A. gigas. The prevalence was 100%. The mean intensity and mean abundance of the parasite were 144.9 of parasites per individual. This study confirms the necessity of constant monitoring of fish in order to reduce fish mortality.

No MeSH data available.


Related in: MedlinePlus

Dawestrema cycloancistrioides (a) total. (b) Posterior region, 1—ventral bar, 2—ventral anchor, 3—dorsal anchor. Scale bars = 10 μm.
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Related In: Results  -  Collection


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fig2: Dawestrema cycloancistrioides (a) total. (b) Posterior region, 1—ventral bar, 2—ventral anchor, 3—dorsal anchor. Scale bars = 10 μm.

Mentions: The moribund fishes collected for analysis were in emaciated condition. Due to the accumulation of mucus, the gills were pale and viscous. The necropsy of fingerlings from A. gigas evidenced the infestation by Dawestrema cycloancistrioides in the gill filaments of the fish (Figure 2). Indeed, the totality of the examined fish (60) showed a high parasitic infestation (Table 1).


High Infestation by Dawestrema cycloancistrioides in Arapaima gigas Cultured in the Amazon Region, Peru.

Mathews PD, Malheiros AF, Vasquez ND, Chavez MD - J Vet Med (2014)

Dawestrema cycloancistrioides (a) total. (b) Posterior region, 1—ventral bar, 2—ventral anchor, 3—dorsal anchor. Scale bars = 10 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4590877&req=5

fig2: Dawestrema cycloancistrioides (a) total. (b) Posterior region, 1—ventral bar, 2—ventral anchor, 3—dorsal anchor. Scale bars = 10 μm.
Mentions: The moribund fishes collected for analysis were in emaciated condition. Due to the accumulation of mucus, the gills were pale and viscous. The necropsy of fingerlings from A. gigas evidenced the infestation by Dawestrema cycloancistrioides in the gill filaments of the fish (Figure 2). Indeed, the totality of the examined fish (60) showed a high parasitic infestation (Table 1).

Bottom Line: The prevalence was 100%.The mean intensity and mean abundance of the parasite were 144.9 of parasites per individual.This study confirms the necessity of constant monitoring of fish in order to reduce fish mortality.

View Article: PubMed Central - PubMed

Affiliation: Department of Parasitology, Institute of Animal Biology, University of Campinas, 13083-862 Campinas, Brazil.

ABSTRACT
The aim of this study was to evaluate the presence of Dawestrema cycloancistrioides in semi-intensive fish farming of fingerlings of Arapaima gigas. Between September and November 2013, 60 individuals of A. gigas born in captivity, were collected in three concrete ponds, from a semi-intensive fish farm in the Peruvian Amazon. For the study of sclerotized structures, parasites were fixed in a solution of ammonium picrate glycerine and mounted in Canada balsam. To visualize internal structures, parasites were fixed in hot formaldehyde solution (4%) for staining with Gomori's trichrome. The parasitic indexes calculated were prevalence, mean intensity, and mean abundance. This study identified a high infestation of a monogenean D. cycloancistrioides in gills of A. gigas. The prevalence was 100%. The mean intensity and mean abundance of the parasite were 144.9 of parasites per individual. This study confirms the necessity of constant monitoring of fish in order to reduce fish mortality.

No MeSH data available.


Related in: MedlinePlus