Well, so far as I can tell, there's been no stripers stocked in Somerville, but it does get hybrids pretty regularly. Not sure if you're asking about stripers or hybrids.
Striped bass are far more elongated, with much more prominent stripes.
Hybrids are deep-bodied like sandbass, and generally have multiple darker (sometimes 'broken') stripes.
Sandbass tend to have one dark stripe and the others are lighter. But their eyes are larger in proportion to their body size than a hybrid usually is.
The key test is to check the center tooth patch. If it's triangular, it's a sandbass. If it's elongated and split, it's a hybrid.
Zackery D. Artim
Denton County Tax Attorney
"Decency is not news; it is buried in the obituaries --but it is a force stronger than crime" ~ Robert A. Heinlein, 1952