Abstract
The ultrastructure of the host-parasite interface was studied in Henneguya laterocapsulata, parasitizing the skin of hybrid catfishes (Clarias gariepinus × Heterobranchus bidorsalis) in Nigeria. The plasmodia were located between malpighian cells, which are the main elements of the multilayered fish epidermis, and were bordered by a single cell membrane. The desmosomal junctions between the malpighian cells were forced apart by finger-like protrusions of the Plasmodium. These plasmodial protrusions finally ran into the host cell without disrupting of the host cell membrane and formed network-like extensions. At the margin of the plasmodium an extensive vacuolization occurred, leading to a wavy surface. Infections with H. laterocapsulata may be an adverse factor in the large-scale production of hybrid catfish fingerlings used for aquaculture in Africa.
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