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Tilapia is one of the commercially important fish in Malaysia as well as in other parts of the world. An understanding of monogenean infection dynamics in tilapia fish may assist us in searching for some intervention measures in reducing the loss of fish caused by parasitic diseases. The present study aimed (1) to compare infection level of monogeneans between the wild and cultured  Oreochromis niloticus , and between the cultured  O. niloticus  and cultured red hybrid tilapia, and (2) to examine the spatial distribution of monogenean species over the gills of the different host species. From a total of 75 fish specimens, six species of monogeneans from two genera:  Cichlidogyrus  ( C. halli ,  C. mbirizei ,  C. sclerosus ,  C. thurstonae ,  C. tilapiae ) and  Scutogyrus  ( S. longicornis ) were identified. Data showed that the infection level of cultured  O. niloticus  was higher than that of the wild  O. niloticus , however, the former was lower than that of the cultured red hybrid tilapia. Higher species richness of monogeneans was observed in the cultured red hybrid tilapia as compared to the others. Results for spatial distribution showed that the monogeneans have no preference on the left or right sides of the gills. However,  C. halli ,  C. mbirizei , and  C. tilapiae  showed preferences on specific gill arches in the cultured  O. niloticus  and red hybrid tilapia. In general, the gill arch IV harboured the least number of monogeneans. The susceptibility of monogenean infection between the different types of tilapia is discussed.

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Gill monogeneans of Nile tilapia (Oreochromis niloticus) and red hybrid tilapia (Oreochromis spp.) from the wild and fish farms in Perak, Malaysia: infection dynamics and spatial distribution