Order of Appearance of Scales in Speckled Trout

Abstract

In Salvelinus fontinalis two scale papillae develop on the lateral line over each myotome. They appear as far back as the adipose fin and independently on the dorsal line anterior to the adipose fin. The scale pattern develops by extensions obliquely forward from the primary papillae. Development is more rapid in the posterior region. Chief variations are bifurcation of rows and extension of rows posteriorly.