Parasitic characterization of rainbow trout (Oncorhynchus mykiss) and their effect on the fish production in floating cages at the fish station “Intiyaco” in the Lake Guamez, Nariño (Colombia)

Abstract

ABSTRACT: The study was performed during 12 months in floating cages at the ‘Intiyaco’ fish station, which belongs to Universidad de Nariño, located in the Guamez lake, in the Department of Nariño (Colombia). A total of 194 specimens of rainbow trout (Oncorhynchusmykiss) with a weight range from 8.74 to 168.85 grams,
and total length from 100.12 mm to 220.66 mm were analyzed. The study aimed to identify the main parasitic entities that affect the O.myk iss species and to evaluate the prevalence rate, the effect of the association between parasitical pathologies and their impact in the different stages of cultivation and production. Data were subjected to Multivariate Analysis, Chi square test and logistic regression analysis using the SPSS 20 - Statistical Package (2013). Results demonstrate that parasitic patologies are mainly found in the gill chamber, with significant prevalence (P<0.05) of the following species: Gyrodactylus (34.76%);Dactylogyrussp (27.59%); Trichodinasp(21.67%); and Ichthyophthiriussp (15.98%). The research demonstrated that 35% larvae and 23% juvenile rainbow trout showed exoparasitosis infestations. The differential analysis of the number of parasites, average value of total length and weight of O. mykiss fish per cultured stage in floating cages determined higher prevalence of unicellular parasites during the larval stage of rainbow trout, affecting the weight and length of diseased fish (9.28 g and 10.98 mm) compared to healthy animals (12.75 g and 180.37 mm). Also the number of animals getting sick during the larviculture phase was higher than 65.5% in relation to species infested during the growing phase.

Keywords:

edema

congestión

necrosis

parásitos

prevalencia

tremátodos

edema

congestion

trematodes

necrosis

prevalence

parasites

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