Parvitaenia cochlearii (Cestoda: Gryporhynchidae) in a cultivation of Pacific fat sleeper Dormitator latifrons from Ecuador

Parvitaenia cochlearii (Cestoda: Gryporhynchidae) en cultivo de chame Dormitator latifrons en Ecuador

Objective. To identify and determine the infection parameters of the metacestodo Parvitaenia in different culture stages of chame Dormitator latifrons and to evaluate the histological damage caused by this parasite. Materials and methods. Forty-five specimens, 15 pre-breeding, 15 pre-fattening and 15 fattening, were examined to identify the parasite by conventional parasitology techniques; and the infection prevalence and average intensity parameters were calculated. Tissue damage was evaluated by fixing liver fragments and processed with the kerosene embedding technique. The difference between intensity per culture phase was evaluated by Kruskal-Wallis test. Total length, weight and Fulton's condition factor were correlated with intensity by linear correlation analysis. Results. A total of 29151 cestodes were found, identified as Parvitaenia cochlearii. The prevalence of the cestode was 100 % in all culture stages. The average intensity ranged from 22.4 to 1729.5 individuals and showed significant differences between culture phases (KW_(2;42) = 36.34; p<0.001). Intensity showed a positive correlation with total fish length (r²= 0.45; p<0.05) and with weight (r²= 0.38; p<0.05). Conclusions. This is the first report of P. cochlearii in cultured D. latifrons. Our results suggest that there is a tendency for cestodes to accumulate during the growth of chames, with infection being higher in the larger sizes, which could have negative implications for trade.

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