Identification and treatment of marine monogen (Microcotylidae) parasite of Sparidentex hasta in Chabahar region

Document Type : article

Authors

1 1- Offshore Fisheries Research Center, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Chabahar, Iran

2 Offshore Fisheries Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Chabahar, Iran

Abstract

Monogens are a class of parasitic flatworms commonly found in fish and aquatic invertebrates. Monogens are hermaphrodites. They feed on the mucus and epithelial cells of the body surface and gills of the fish. Some are viviparous and spawning and are present in marine and fresh water. More than 4000 to 5000 species have been identified. In viviparous specimens, it can keep up to three generations in its belly .In spawning specimens, gravid specimens release eggs into the sea where they continue to develop and hatch into oncomiracidia – free swimming ciliated larva that eventually finds and attaches to the host. In this study, in the coastal waters of Chabahar region, 20 fish (Sparidentex hasta) weighting approximately 500 g were transferred to the aquaculture workshop of Offshore Fisheries Research Center for study, and after 8 days, Casualties were observed 4 fold of the fish. After taking samples from the gills of Sparidentex hasta in the form of a wet smear and using a light microscope by a 4x and 10x lens, and marine Monogen (Microcotylidae) was identified. Formalin long-term bath at 30 ppm for 24 hours removed the parasite and there were no casualties.

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