New neutrophil types in red seabream Pagrus major infested with Ceratothoa verrucosa: Fourth and fifth neutrophil types
2020
Kondo, M. (National Fisheries University (Japan). Department of Applied Aquabiology) | Yasumoto, S.
We report the morphology and cytochemistry of new neutrophil types (fourth type, N-4sup(th); fifth type, N-5sup(th)) from Ceratothoa verrucosa (Cv)- infested red seabream Pagrus major with morphological abnormalities. The number of Cv in each infested fish was one (usual parasitism). The N-4sup(th) and N-5sup(th) were observed in the infested fish with mouth insufficiency (MI; Mouth closure was incomplete) and with MI plus exophthalmos (ocular proptosis), respectively. The bulging eyes contained bubbles. The first (N-1sup(st)), second (N-2sup(nd)) and third (N-3sup(rd)) neutrophil types have been reported from Cv-infested fish showing usual parasitism without morphological abnormality, unusual parasitism with MI, and super-unusual parasitism with MI plus exophthalmos, respectively. Therefore, the N-4sup(th) and N-5 sup(th) will be the intermediate types (N-4 sup(th), between N-1sup(st) and N-2sup(nd); N-5sup(th), between N-1sup(st) and N-3sup(rd)).
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