Effect of teflubenzuron on Diplectanutn aequans (Monogenea: Diplectanidae) infestations in cultured sea bass, Dicentrarchus labrax.

摘要

The efficacy of oral administration of teflubenzuron on cultured sea bass (Dicentarchus labrax) naturally infected with Diplectanum aequans was investigated. Two different groups of fish (sea bass weighing 80-100 g, mean weight: 92+or-1 g SD) received a daily dosages of 10 and 20 mg kg-1 teflubenzuron in feed to for 7 days. On day 0, 7, 14, 21 and 28 of the experiment, fish were randomly sampled and then parasites on the gills were counted. Comparisons were made to untreated control fish. At experimental start all examined fish were infected with D. aequans. There were no statistical differences (P>0.05) in terms of mean number of D. aequans within each group, including the control. The treatment did not reduce the infection level of D. aequans. No mortality was found and adverse drug reactions or palatability problems were not associated with the treatments during the study. Seawater temperature and salinity in the pens were 16.0-16.5 degrees C and 35 ppt, respectively.