On Diplostomulum tregenna, the Diplostomulum Stage of Diplostomum tregenna Nazmi Gohar, 1932 with an Experimental Demonstration of Part of the Life Cycle

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Abstract
While working on the cranial nerves of the Nile fish Clarias lazera Cuvier and Valenciennes, my attention was drawn to the presence of a very large number of trematode larvae on the brain. Subsequently twenty-four fishes were examined, both from the White Nile and the Blue Nile in Khartoum area in the Sudan, and twenty-two fishes were found to be heavily infected, each with several hundreds of the parasite. The parasite was identified through the help of Dawes' book—The Trematoda—and after feeding experiments, as Diplostomulum tregenna the larval stage of Diplostomum tregenna Nazmi Gohar, 1932. The parasite was found above or in front of the brain in the fat tissue, in the cranial cavity. Closer examination did not reveal the presence of the parasite in the brain tissues and its cavities, nor in the eyes, two of the most common places in which the majority of similar larvae occur. In some of the heavily infected fishes haemorrhage occurred which may suggest that the parasites reached the brain through the blood stream.