TRIALS FOR CONTROL OF MONOGENEA IN SOME FRESHWATER FISHES

TRIALS FOR CONTROL OF MONOGENEA IN SOME
FRESHWATER FISHES

Mohamed E. Abou Atta and Gehan I. Abd El-Bar Shagar

Fish Health and Management Dep., Central Lab. For Aquaculture Research (El-Abbassa), Agriculture Research Center, Egypt.

Abstract

Monogenetic trematodes of freshwater fishes coud be considered one of the most prevalent helminthes affecting skin and gills including irritation, sever gill destruction and impaired breathing as a sever losses (anemia, emaciation followed by death). The study conducted to evaluated the efficacy of Bafry D – 50 / 500 as a therapeutant for the control of infestation of monogenetic trematodes in freshwater fishes. Five hundred Nile tilapia (Oreochromis niloticus) and Five hundred Common carp (Cyprinus carpio) were collected from earthen ponds of Central Laboratory for Aquaculture Research, Abbassa, Abou Hammad Sharkia, Egypt (CLAR), transported alive for examination of fish for reliable diagnosis of monogenetic trematodes infection . This experiment was carried out in wet laboratory to assess the response of O. niloticus, C. carpio and monogenetic trematodes to Bafry D – 50 / 500 exposure at three dosages, 0.5 ml / L (250 ppm), 0.75 ml / L (375 ppm) and 1 ml / L (5oo ppm) for 10 minutes for three successive days. The fish were examined daily after application to sure that elimination of monogentic trematodes by gill biopsy. However single treatments with Bafry D – 50 / 500 at concentration of 0.75 ml / L(375 ppm) was the best dose for treatment and elimination of monogenetic trematodes without any side effect on fish. Blood samples were taken also to study the effect of Bafry D -50 / 500 on the hematological findings of fish used in this study.