Fish
Blackstripe Topminnow
Fundulus notatus · also called blackstripe topminnows
Just beneath the surface of a quiet drainage ditch, a blackstripe topminnow hovers in place, its bold dark stripe and upward-angled eyes marking it as a fish built specifically for a life spent watching the water’s surface for its next meal.
Overview
The blackstripe topminnow, Fundulus notatus, is a small, surface-dwelling fish native to slow-moving streams, ditches, sloughs, and wetland habitat across a broad range of the central and eastern United States. Its bold identifying stripe, surface-feeding adaptations, and tolerance for a wide range of quiet freshwater habitats make it a common and easily recognised member of its family.
A fish that lives at the surface
Nearly every physical feature of the blackstripe topminnow, from its flattened head to its upward-angled eyes, reflects a lifestyle built around feeding at the thin boundary between water and air.
Status
Least Concern — widespread and abundant across suitable slow-moving freshwater habitat throughout the central and eastern United States.
Blackstripe Topminnow: common questions
How can you identify a blackstripe topminnow?
Look for a bold, continuous dark stripe running the length of the body from snout to tail, a distinctive pattern that gives the species its common name and makes it one of the more easily identified small fish found in slow-moving streams within its range.
Why does the blackstripe topminnow stay near the surface?
This species has a somewhat flattened head with upward-angled eyes well suited to spotting insects landing on or near the water's surface, an adaptation that supports its habit of spending most of its time feeding just beneath the surface rather than lower in the water column.
How does the blackstripe topminnow reproduce?
Females lay eggs equipped with sticky filaments that attach them to submerged vegetation, where the eggs remain until hatching without any further parental care from either parent, a common reproductive strategy among topminnow species.
What kind of water does the blackstripe topminnow prefer?
This species tolerates a variety of slow-moving freshwater habitats including streams, drainage ditches, sloughs, and the quiet backwaters of larger rivers, generally avoiding fast-flowing water in favour of calmer conditions near the surface.