Studies on formation and resorption of fish scales: IV. ultrastructure of developing scales in newly hatched fry of the sheepshead minnow, Cyprinodon variegatus (Atheriniformes: Cyprinodontidae)
1980
Scale formation in Cyprinodon variegatus was found to be initiated at about 26 to 30 days after hatching. Ultrastructural investigation revealed that within 4 to 6 h in the first-formed scales the marginal cells begin to flatten and differentiate into osteogenic cells, which later change to osteoblasts and fibroblasts. These cells are separated from the surrounding epithelial cells by a basal lamina. The osteoid is formed by the marginal and osteogenic cells; the osseous layer by the osteoblasts; and the fibrillary plate by the fibroblasts.
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