Threadfin Shad Identification Guide

Key identification features

• Small, deep-bodied, laterally compressed fish, usually under 20 cm
• Bright silvery sides with a pale yellow to olive tint on the fins
• A single long, thread-like filament trailing from the last ray of the dorsal fin
• One faint to moderate dark spot on the shoulder behind the gill cover
• Small, terminal, slightly upturned mouth and blunt snout
• Deeply forked tail fin

Common look-alikes

• American gizzard shad: shares the deep shad-like shape but has a subterminal, underslung mouth and pointed snout, and lacks the yellow tint seen in threadfin shad fins.
• Skipjack shad: grows much larger with a distinctly projecting lower jaw and no trailing dorsal filament.
• Other small silvery baitfish: the whip-like dorsal filament is the single most reliable mark separating threadfin shad from similar-sized minnows and herrings.

Where you'll see one

Threadfin shad live in freshwater and brackish lakes, reservoirs, and slow rivers across the southeastern and south-central United States, and have been widely introduced elsewhere as a forage fish for sport fish management.