spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by DIETRICH, M. A.
Right arrow Search for Related Content
PubMed
Right arrow Articles by DIETRICH, M. A.

Quarterly Journal of Microscopical Science, Vol s3-94, 71-82, Copyright © 1953 by Company of Biologists

A Histological Study of the Development of the Scales of the Largemouth Black Bass (Micropterus salmoides)

MARY ALICE DIETRICH 1

1 Simmons College, Boston, Massachusetts

1. The scale method of age determination in largemouth black bass, Micropterus salmoides, is valid at least up to and probably including the third year of the fish's life. A more careful study of older fish might reveal that it was valid beyond that point.

2. The annulus in a largemouth black bass is formed by a brief but gradual slowing down of growth and then its quick resumption. The annulus appears as a wide band on the anterior edge of the scale, and as a dark line (circulus) cutting across some inner dark lines (also circuli) on the lateral edges.

3. The scale is mesodermal in origin, and lies in a pocket surrounded by dermal tissue, which in turn is covered externally by a thin layer of epidermis.

4. The bony layer is formed by osteoblastic cells on its outer surface in a manner similar to the formation of dermal bone. Excess bony material is accumulated in ridges or circuli.

5. The fibrillary plate is formed by the fibroblastic cells on its inner surface.






© The Company of Biologists Ltd 1953