Fish diurnal

Redfin Shiner

Lythrurus umbratilis

A hidden gem of the creek, the Redfin Shiner transforms from a humble silver minnow into a fiery crimson spectacle during the summer months. These social swimmers turn ordinary stream pools into vibrant underwater festivals.

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Quick Identification

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Size

Typically 5-8 cm (2-3 inches) in length

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Colors

Silvery-blue body with a prominent dark spot at the base of the dorsal fin. Breeding males develop fiery red or orange fins and a rosy flush across their heads and bodies.

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Key Features

Dark spot at the front base of the dorsal fin
Breeding males display vibrant red fins and blue-silver bodies
Slender, side-compressed body shape
Small white 'tubercles' or bumps on the heads of males during spawning

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10 AM - 4 PM (when sunlight is highest and water is clearest)

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Season May-August (during peak spawning and color display)

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Diet An omnivorous forager that eats small aquatic insects, larvae, zooplankton, and various types of algae found on submerged rocks.

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Habitat Found in small to medium-sized streams with slow currents, preferring clear water with sandy or gravel bottoms and some aquatic vegetation.

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Behavior

The Redfin Shiner is a social, schooling fish that brings a surprising burst of color to North American streams. Unlike many other minnows that blend into the background, these fish are famous for their high-energy displays during the summer months. They are 'nest associates,' meaning they frequently gather around the nests of larger fish like Green Sunfish or Longear Sunfish to deposit their own eggs, benefiting from the protection of the larger fish.

In the water, they are incredibly active and fast-moving. While they aren't traditionally 'tame,' they are relatively bold for small fish and will often hover in mid-water columns where the current is slow. Because they are social, seeing one Redfin Shiner usually means there are dozens more nearby, darting through the shadows and sunlight of the creek bed.

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Camera Tips

To capture the Redfin Shiner on camera, you need to think like an underwater cinematographer. Since these fish are small and fast, a submersible action camera (like a GoPro or a dedicated underwater trail cam) is your best bet. Place the camera in shallow, clear pools—ideally near a submerged log or a sunfish nest during the summer. Use a weighted mount to keep the camera steady on the stream bed, angling it slightly upward toward the water surface to catch the light glinting off their scales.

Lighting is the most critical factor for this species. Try to set your camera during the brightest part of the day when the sun can penetrate the water column; this is the only way to truly capture the brilliant reds and blues of the breeding males. If you are filming from above the water, a circular polarizing filter is mandatory to cut through the surface reflection and see into the creek.

For settings, use a high frame rate (at least 60fps). These fish move in quick, jerky bursts, and standard frame rates will often result in a blurry silver streak. A high shutter speed will help freeze the motion of their fins. Because they are curious, you don't necessarily need bait, but stirring up a small amount of sediment or 'kicking' a few rocks upstream can release natural larvae that will draw the school right in front of your lens.

Similar Species

Species that look similar or are commonly confused with Redfin Shiner.

Common Shiner

Lacks the dark spot at the base of the dorsal fin and has much larger, taller scales on its sides.

Rosyface Shiner

Has a pointier snout and the red coloration on males is usually confined to the head rather than the fins.

Redfin Pickerel

Much larger with a duck-bill shaped snout; it is a predator, not a minnow.

Frequently Asked Questions

Redfin Shiners are most active during the day, particularly when the sun is directly overhead. This provides the best visibility for them to hunt for small insects and allows observers to see their bright colors more clearly.

If you have a natural stream on your property, maintaining healthy riparian buffers (plants along the bank) and avoiding chemical runoff will keep the water clear enough for them. They love slow-moving pools with gravel bottoms and natural underwater debris like fallen branches.

They have a varied diet consisting of algae, small aquatic invertebrates, and terrestrial insects that fall onto the water's surface. They are opportunistic feeders that will snap at almost anything small and moving.

Yes, they are quite common in suburban and rural streams throughout the Ohio and Mississippi River basins, provided the water isn't heavily polluted or overly silted from construction.

The most reliable field mark is the dark spot at the base of the dorsal fin. During the summer, the males' brilliant red fins are a dead giveaway that sets them apart from the more common silvery-colored minnows.

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