Studies on the Regenerative Scales of Fishes-Ii

Abstract

(1) It is difficult to tear off experimentally the scales of mud-loach, Misgurnus fossilis anguillicaudatus, because of their relatively small size. If the operation is carried out unski llfully, deformed scales would oftenly be regenerated on account of presumptive damage of the scale pockets.(2) The early regenerative scales have a broad scuiptureless focal area occupying almost all of the scale dimention, and they resemble the ordinary scales of Cobitis taenia.(3) Regenerative scales observed 172 days after the operation are a little smaller in the whole shape and somewhat fewer in number of circular grooves than the ordinary ones. As time goes by, the structure of the former bears resemblance to that of the latter and conse quently when the breeding of the fishes is continued, it may be supposed that these regenera ted scales would completely return to the ordinary ones.

Studies on scale regeneration in the Common goby, Pomatoschistus microps (Pisces)

“…The most striking account of scale regeneration have been reported by Suzuki (1952) and Kobayasi & Kawai (1960), who confirmed a complete recovery in the surface of the regenerated scales indistinguishable from the original ones, within a period of six months, in goldfish. A study on the histology of regenerated scales in P. microps has been done by the author (Fouda, in press), and was found that the cells responsible for the formation of circuli usually degenerate on the completion of calcification in the regenerated area.…”