Abstract

VARGAS L, Mario et al. Parasites and histopathological lesions in gills of juvenile gamitana (Colossoma macropomum) raised in semi-intensive farming. Rev. investig. vet. Perú [online]. 2015, vol.26, n.4, pp.577-586. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v26i4.11222.

The aim of this study was to determine the type and frequency of parasites in gamitana gills (Colossoma macropomum)and todescribetheassociated histopathological lesions. Thirty specimens were taken from a fish farm in Iquitos, Peru. The left branchial arches were placed in Petri dishes with distilled water to observe the presence of parasites and the right arches were fixed with formalin 5% for histopathological studies. Besides, water quality of the pond was analyzed. Three types of ectoparasites were identified: monogeneans,membersof theFamilyDactylogyridae, SubfamiliesAnacanthorinaeand Ancyrocephalinae(100%,30/30),onesprotozoan,member oftheFamilyOodinidae,genus Piscinoodinium (36.7%, 11/30), and one arthropod, member of the Class Maxillopoda, Sub-class Copepoda (20%, 6/30). Among the histopathological lesions, the most common wereinflammatorydisorders:presenceofeosinophilicgranulecells(100%), andadaptation disorders:epithelialhyperplasia(96.7%),lamellar fusion (80%)andlamellar atrophy(60%). Moreover, dissolved oxygen was close to lethal levels, pH was acid and CO₂ were outside the expected range

Keywords : gamitana; Colossoma macropomum; monogenean; Piscinoodinium; copepod; gill ectopar.

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