Brook Silverside

The Brook Silverside (Labidesthes sicculus) is a small, slender freshwater fish in the family Atherinopsidae, native to lakes, rivers, and streams across much of eastern and central North America, from the Great Lakes region south through the Mississippi drainage. It is the only widespread freshwater silverside native to much of its range and is notable for its unusually elongated, beak-like snout, which sets it apart from most other North American freshwater fish. The species is short-lived, typically surviving only about one year, and is known for its habit of leaping and skittering across the water's surface, giving rise to the common name 'skipjack minnow.'

Brook Silversides are very slender fish, usually 5-9 cm in length.

• Body: extremely elongated, laterally compressed, nearly transparent
• Markings: a bright silver stripe runs along the midline from head to tail
• Snout: distinctly elongated and beak-like, with a small terminal mouth, unlike most native freshwater fish
• Fins: a tiny first dorsal fin set far back on the body, separate from the larger second dorsal fin
• Tail: forked The combination of a needle-like beak, thread-thin translucent body, and bright silver stripe makes this species easy to distinguish from other small freshwater fish sharing its habitat.

Brook Silversides inhabit the open, surface waters of lakes, ponds, and slow-flowing rivers across much of eastern and central North America, from the Great Lakes basin south through the Mississippi River system. They favor clear water with minimal current, typically remaining near the surface in open water areas rather than dense vegetation. The species is sensitive to water clarity and quality, generally avoiding heavily turbid or degraded waters. Brook Silversides are most often observed in schools skimming just beneath the surface of calm bays, coves, and open lake or river sections during warmer months.

Brook Silversides are highly active, schooling fish that spend most of their time near the water's surface, frequently darting and skipping across it when startled, a behavior that gives the species its 'skipjack' nickname. They feed primarily on small flying and aquatic insects, picking prey from the surface film and just below it throughout the day. The species has an unusually short lifespan, with most individuals living only about one year, spawning once during a single summer breeding season before dying; eggs are scattered near the surface and left unguarded. As short-lived, abundant schooling fish, Brook Silversides are an important surface-feeding prey source for larger fish and birds.