Occurrence of parasites in cultured common dentex (Dentex dentex L.) from I•zmir, Turkey

Common dentex (Dentex dentex L.) has been introduced in Mediterranean aquaculture as an alternative to sea bass and sea bream. A pilot study was conducted on the parasitic fauna of cultured common dentex from Aegean sea coast of Turkey. The research was carried out between May and October 2007. 94 fish were examined and totaly 8 protozoan and metazoan genera were found: Amyloodinium Brown and Hovasse, 1946; Trichodina Ehrenberg, 1838; Epistylis Ehrenberg, 1830; Riboscyphidia Jankovski, 1985; Ceratomyxa Thelohan, 1892; Gyrodactylus Nordmann, 1832; Microcotyle Beneden and Hesse; Clavellotis Castro and Baeza, 1984. Gross pathology and peaks of mortalities and morbidities coincided with high abundance of three of them: Amyloodinium sp., Gyrodactylus sp. and Ceratomyxa sp

The effect of Teflubenzuron on the control of Lernanthropas kroyeri (van Beneden, 1851) (Lernanthropidae) infestations in cultured sea bass, Dicentrarchus labrax (Linnaeus, 1758)

Two different dose groups were formed to evaluate the efficacy of teflubenzuron as a treatment for Lernanthropus kroyeri (van Beneden, 1851) infestation in cultured sea bass Dicentrarchus labrax (L.). Teflubenzuron, coated on commercial feed pellets was administered orally at doses of 0 (control), 10, 20 mg kg-1 biomass day-1 for 7 consecutive days. Fish were randomly sampled and parasites were counted on days 7, 14, 21 and 28, and comparisons were made to untreated control fish. Seawater temperature was 16-18 °C. Treatment with teflubenzuron was not effective against larval and mature stages of L. kroyeri. No differences were observed in growth between the treatment groups and the control group. No mortality was found and adverse drug reactions or palatability problems were not associated with the treatments during the study (p > 0,05)

The effect of trichlorfon on the control of Lernanthropus kroyeri (van Beneden, 1851) (Lernanthropidae) infestations in Cultured sea bass, Dicentrarchus labrax (Linnaeus, 1758)

Sea bass, Dicmtrarchus labrax naturally infected with L. kroyeri were exposed to dosage of trichlorfon for 7 days: 0 (as control), 50 mg kg -1. On days 0, 7, 14, 21, 28 and 35 of the experiment, fish were randomly sampled and weighed, and then parasites on the gills were counted. Comparisons were made to untreated control fish. Sea water temperature and salinity in the pens were measured as 16.0-16.5°C and 35 ppt, respectively. When the study began, all of the examined fish were infected with L. kroyeri. There were no statistical differences (P > 0.05) in terms of mean number of L. kroyeri within each group, including the control. According to the IRR coefficients, 50 mg dose of trichlorfon reduce the males at 98.3%, females at 97.1% and the total 97.1% when compared to the control group. No mortality was found and adverse drug reactions or palatability problems were not associated with the treatments during the study