The X-cell pseudotumor found on the starry flounder, Platichthys stellatus, in the lake Mokoto, the eastern Hokkaido [Japan]
1990
Kato, T. (Hokkaido National Fisheries Research Inst., Yoichi (Japan)) | Prince Masahito | Ishikawa, T. | Minami, T.
The present study was carried out to examine the incidence of X-cell pseudotumors in the starry flounder, Platichthys stellatus (Pallas), in Lake Mokoto, and their influence on the growth of the fish. X-cell pseudotumors were more likely to occur on the depigmented side than on the pigmented side of the fish. The number of fish with X-cell pseudotumors changed according to the seasons and the highest incidence recorded was 29.9% for the fish in April. The occurrence of X-cell pseudotumors in the starry flounder seems to be age-related. The number of fish with X-cell pseudotumors, as well as the mean number of X-cell pseudotumors in a single specimen was greatest in 1-year-old, and decreased progressively in older age groups. The stomach content weight of the fish with X-cell pseudotumors was smaller than that of the normal fish. Furthermore, both the body length and weight of the fish with X-cell pseudotumors were smaller than those of the normal fish
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