Fauna
Fish · GBIF taxon 5203654

Tanasi Studfish

Fundulus catenatus

Also known as Northern Studfish, Chain Killifish

Northern studfish patrol sunlit, gravel-bottomed riffles and clear pools across upland streams of the central and southern United States. During the spring breeding season, males transform into vibrant spectacles of metallic iridescent blue, dotted with horizontal chains of bright orange and russet spots that give the fish its species name catenatus. Unlike many annual killifish that rely on ephemeral waters, this hardy perennial species thrives in perennial river systems where it actively hunts drifting insect larvae along the substrate.

FreshwaterStream FishColorful
Tanasi Studfish reference1 / 2
Licensed reference(c) Dominic, some rights reserved (CC BY), uploaded by Dominic · cc-by
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & prey
  • Mayfly Nymphs
  • Chironomid Midge Larvae
  • Amphipods
Predators
  • Smallmouth Bass
  • Belted Kingfisher
  • Northern Watersnake
ThreatsSiltation, dam construction, agricultural runoff, and loss of clear-water stream corridors
HabitatsClear, rocky upland creeks, springs, and small to medium rivers with gravel or bedrock bottoms
Life span3–5 years
Classification
  1. OrderCyprinodontiformes
  2. FamilyFundulidae
  3. GenusFundulus
  4. SpeciesFundulus catenatus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
Responsible observation
  • Polarized Glasses: Wear polarized sunglasses on sunny days to cut surface glare and spot colorful territorial males in shallow riffles.
  • Snorkeling Observation: Drift slowly mask-down in clear spring-fed creeks to watch courtship displays without disturbing the gravel substrate.
Related species
Help improve the field guideSomething wrong?

Report a name, category, or profile issue for review.

Checking your Fauna account…