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Scioto madtom
Scioto madtom
Scioto madtom
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Scioto madtom
Extinct
Extinct (2013)  (IUCN 3.1)[1]
Presumed
Presumed Extinct (2013)  (NatureServe)[2]
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Ictaluridae
Genus: Noturus
Species:
†N. trautmani
Binomial name
†Noturus trautmani

The Scioto madtom (Noturus trautmani) was a species of fish in the family Ictaluridae. It is listed as extinct by the International Union for Conservation of Nature, which notes that it has likely been entirely or functionally extinct since 1957 given the lack of records since that year.[1]

This fish was endemic to Ohio in the United States. Only one population was ever known; it was located in Big Darby Creek, a tributary of the Scioto River. Eighteen specimens were collected, all at one riffle in this creek, an area called Trautman's Riffle. It has not been seen since 1957.[3]

It was proposed for removal from the list of endangered species by the U.S. Fish & Wildlife Service on September 30, 2021.[4][5] It was removed on October 16, 2023, in accordance with the Endangered Species Act due to it being declared extinct.[6][7]

References

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Further reading

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Scioto madtom

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from Grokipedia
The Scioto madtom (Noturus trautmani) is an extinct species of small freshwater in the family , endemic to a limited stretch of Big Darby Creek, a tributary of the in central . Reaching a maximum length of about 2.25 inches (6.1 cm), it had a long, slender body that was gray to dusky olive-brown dorsally, marked by four dark saddles, with a low adipose fin connected to the caudal fin by a small notch and no dark blotch on the adipose fin. Nocturnal in habit, the species hid under rocks or in vegetation during the day and foraged along stream bottoms at night, with only 18 individuals ever documented since its discovery in 1943. Listed as federally endangered in 1975 due to its extreme rarity and restricted range, the Scioto madtom was proposed for delisting as extinct in 2021 and officially removed from the Endangered Species Act in October 2023, with the last confirmed sighting occurring in 1957. Its decline was driven by habitat degradation in Big Darby Creek, primarily from , industrial pollution, and agricultural runoff, which altered the clear, gravelly streambed essential for its survival. As Ohio's only endemic , its extinction underscores broader threats to aquatic in the Midwest, though ongoing monitoring and restoration efforts in the region continue to benefit related and the .

Taxonomy

Classification

The Scioto madtom is classified within the domain Eukarya, kingdom Animalia, phylum Chordata, class , order Siluriformes, family , genus Noturus, and species Noturus trautmani. This placement situates it among the North American freshwater catfishes, a family endemic to the continent and characterized by robust body forms adapted to riverine environments. Madtoms of the genus are small, bottom-dwelling distinguished from other ictalurids by the continuous connection or fusion of the low adipose to the caudal , creating a tadpole-like posterior profile, along with the absence of scales and the presence of strong pectoral spines. The comprises over 30 , primarily distributed across eastern and central , with many exhibiting specialized adaptations to and pool habitats in temperate streams. The Noturus trautmani was established in 1969 by ichthyologist William R. Taylor in his revision of the , based on type specimens collected from Big Darby Creek, a tributary of the in . Taylor's highlighted its distinct morphological traits within the . Within Noturus, the Scioto madtom is morphologically allied to species in the subgenus Rabida, sharing features such as a slender body and specific fin ray counts, but it differs from close relatives like the stonecat (Noturus flavus) in its smaller adult size, more pronounced dark saddles, and lack of a light-colored venter on the head.

Etymology

The common name Scioto madtom reflects the species' restricted historical distribution within the Scioto River drainage in central Ohio, specifically Big Darby Creek, a tributary of the Scioto River. The component "Scioto" derives from a Wyandot Native American term, scionto, meaning "deer," in reference to the abundant wildlife along the river. The term "madtom" is a vernacular name shared among small-bodied catfishes of the genus Noturus, combining "mad"—alluding to their aggressive defensive response involving venomous, serrated pectoral spines that can inflict painful stings—and "tom," a colloquial diminutive for catfish, evoking the image of a feisty tomcat. The binomial scientific name is Noturus trautmani. The genus name Noturus originates from the Greek words nōton (back) and ourá (tail), describing the characteristic fusion of the adipose and caudal fins, which positions the tail fin in close proximity to the back. The specific epithet trautmani is an eponym honoring Milton Bernhard Trautman (1899–1991), a pioneering self-taught ichthyologist and curator at the Museum of , renowned for his comprehensive studies on Ohio's fishes and for collecting the type specimens of this species from Big Darby Creek in 1943. Noturus trautmani was formally described and named by ichthyologist William R. Taylor in his 1969 monograph revising the genus Noturus, published as Bulletin 282 of the National Museum.

Description

Morphology

The Scioto madtom (Noturus trautmani) exhibits a slender, elongated body adapted for a benthic lifestyle, with known specimens reaching a maximum total length of 44 mm (1.7 in); no mature adults were collected. The head is slightly depressed with a terminal mouth, surrounded by four pairs of barbels that aid in sensory detection along the stream bottom. The skin is smooth and scaleless, characteristic of the family , providing a streamlined form for navigating riffle substrates. The pectoral fins feature short spines that are moderately serrated for defense, with 5–7 large teeth on the posterior edge and smaller teeth along the anterior margin. The dorsal includes a stout spine anteriorly. A low adipose is present, broadly connected to the caudal via a shallow notch. The caudal is square to slightly rounded, while the elongate anal has 13–16 rays (typically 14). These structures support agile maneuvering in fast-flowing, rocky habitats.

Coloration and variation

The Scioto madtom displays a cryptic coloration adapted for its environment, with the dorsal surface ranging from gray to dusky olive-brown and marked by four prominent dark saddles extending along the back from behind the head to the base of the tail. These saddles provide disruptive patterning that blends with the gravelly substrate. The sides are lighter brown, occasionally mottled for further . The ventral surface is unspotted and pale, typically white or cream-colored, contrasting with the darker dorsum. The caudal fin features a distinctive dark bar or crescent in its center, while the pectoral, pelvic, and anal fins are dusky overall with lighter edges. The adipose fin, connected to the caudal fin, lacks dark pigmentation. in coloration is minimal among madtoms, including the Scioto madtom, with no documented evidence of intensified pigmentation in males during the breeding season. This subdued variation aligns with the species' overall conservative appearance. Due to the extremely limited number of specimens—only 18 individuals ever collected, all from a single in Big Darby Creek, all juveniles with no mature adults documented—coloration variation remains poorly understood, and no geographic morphs or significant individual differences have been observed.

Distribution and habitat

Historical range

The Scioto madtom (Noturus trautmani) was endemic to a limited stretch of Big Darby Creek in Madison and Pickaway Counties, , a of the . The species was first discovered on November 4, 1943, by ichthyologist Milton B. Trautman, approximately 1 mile south of the village of in southeastern Jackson Township, Pickaway County. Subsequent collections occurred in 1945 and 1957, with the last confirmed sighting in 1957 at Trautman's Riffle, a series of riffles and runs in the same locality; of the 18 total specimens, 15 were collected in 1957 and all but one from this riffle. No specimens have ever been recorded outside Big Darby Creek, and the species' highly restricted range is presumed to result from its dependence on particular conditions within this . A total of 18 individuals were collected over the 14 years spanning 1943 to 1957, all from this confined area of the creek.

Habitat requirements

The Scioto madtom (Noturus trautmani) inhabited shallow riffles characterized by moderate water current, providing the dynamic flow essential for its . These riffles featured clean substrates composed primarily of and , interspersed with cobble, , and occasional large boulders or slabs, which offered critical cover and nesting sites. This species required high-quality water conditions, including well-oxygenated flows with low and minimal suspended sediments, and it exhibited intolerance to that could smother its preferred substrates. As a benthic dweller, the Scioto madtom led a secretive , concealing itself during daylight hours under rock slabs, in crevices, or amid rubble, and it was closely associated with clear, groundwater-influenced streams that maintained stable, sediment-free environments. The Big Darby Creek, a National Wild and Scenic River and the sole known locality for the species, exemplified these traits with its spring-fed, relatively undisturbed riffles and minimal impoundments prior to the 1950s, supporting a diverse benthic community.

Biology

Behavior and diet

The Scioto madtom exhibits a primarily nocturnal lifestyle, remaining inactive and concealed under rocks or in streamside vegetation during daylight hours to evade predators. At night, individuals emerge to forage along the stream bottom, relying on sensitive barbels to locate and identify prey in low-visibility conditions. It is an omnivorous bottom feeder that consumes a wide variety of plant and animal life. Based on studies of related Noturus species, its diet is inferred to include mainly aquatic insect larvae, such as those of mayflies (Ephemeroptera), caddisflies (Trichoptera), and midges (Chironomidae), supplemented by small crustaceans such as amphipods and occasional algae or plant detritus, reflecting opportunistic feeding habits common among Noturus species. Stomach content analyses of closely related madtoms, such as the frecklebelly madtom (Noturus munitus), indicate that insect larvae often constitute over 70% of dietary volume, with crustaceans providing additional protein sources. In response to threats, the Scioto madtom deploys its sharp pectoral and dorsal spines, which can be locked in an erect position to deter predators and complicate extraction from shelter, a defensive trait shared across the family. Ecological interactions are limited, with no records of schooling behavior; the species likely serves as prey for larger stream fishes such as darters (Etheostoma spp.) or (Micropterus dolomieu), though direct observations are absent due to its rarity.

Reproduction

The of the Scioto madtom (Noturus trautmani) remains poorly understood due to the extreme rarity of observations prior to its presumed , with no direct records of spawning or early life stages available. Due to the paucity of specimens, details are almost entirely inferred from congeneric species. Like other species in the genus Noturus, it is inferred to exhibit and dioecious mating, with spawning likely occurring in summer months, potentially from to . This timing aligns with patterns observed across the genus, where reproductive seasons often extend from through early fall in temperate streams. Females in the genus Noturus typically reach at age 1 to 2 years, producing a single annual of eggs that are deposited in protected nests, such as cavities or depressions under flat rocks or slabs. sizes for closely related small-bodied range from 16 to 160 eggs, potentially similar for the Scioto madtom given its body size, though unconfirmed. Males provide by guarding the eggs and newly hatched larvae, fanning them for oxygenation and defending against predators until the young disperse, a behavior consistent with Noturus species. Post-hatching, larvae remain benthic and associated with the nest site initially before shifting to independent along bottoms, reflecting the genus's to habitats. The Scioto madtom likely had a short lifespan of 2 to 3 years, inferred from the brief life histories of similar small Noturus congeners that mature quickly and reproduce once or twice before . Adults may undertake downstream migrations in fall following spawning, a movement pattern suggested for the based on limited historical collections.

Conservation

Status and listing history

The Scioto madtom (Noturus trautmani) was federally listed as an under the Endangered Species Act on September 25, 1975, due to its presumed rarity and limited distribution in a small portion of Big Darby Creek, . This listing followed its initial recognition as one of Ohio's first state-endangered species in 1974, reflecting early conservation concerns for the fish's persistence. Monitoring efforts began shortly after federal listing, with extensive surveys conducted by the U.S. Fish and Wildlife Service (USFWS) and the Ohio Department of Natural Resources (ODNR) from the 1970s through the 2000s, including targeted searches in 1976–1977 and 1981–1985, as well as annual monitoring at the type locality from 1970 to 2005; these efforts yielded no confirmed sightings since the last record in 1957. The International Union for Conservation of Nature (IUCN) assessed the species as Extinct (EX) in 2012, with the status formally updated in 2013, based on the absence of detections despite comprehensive sampling. Five-year status reviews under the Endangered Species Act were initiated in 1985, 1997, and 2009, each confirming no evidence of recovery or persistence and recommending further evaluation for potential delisting due to extinction. Additional surveys, such as Ohio Environmental Protection Agency efforts in 2014–2015 that collected over 96,000 fish without detecting the madtom, and varied techniques (e.g., seining and electrofishing) from 2001 to 2019, reinforced these findings. On October 17, 2023, the USFWS published a final rule in the Federal Register removing the Scioto madtom from the list of endangered and threatened wildlife, effective November 16, 2023, due to verified extinction; Ohio simultaneously delisted it from the state endangered species roster.

Threats and decline

The primary threat to the Scioto madtom was habitat degradation through caused by agricultural practices and urban development in the Big Darby Creek watershed, which smothered essential habitats and reduced dissolved oxygen levels critical for the . This intensified in the mid-20th century as row-crop farming expanded, leading to increased and deposition that altered the gravelly substrates preferred by the . Channelization of portions of Big Darby Creek for agricultural drainage, dating back to the early 1900s, further exacerbated habitat loss by straightening channels, reducing complexity, and promoting accumulation. Pollution from industrial discharges, sewage effluents, and agricultural runoff, including pesticides and fertilizers, significantly contributed to the ' decline, particularly after the 1950s when post-World War II industrialization and farming intensification altered water chemistry and quality in the basin. These contaminants likely impaired and by increasing and in the limited habitats. Additional factors included potential competition with the northern madtom (Noturus stigmosus), which was first recorded in Big Darby Creek in 1957—the same year as the last Scioto madtom collection—possibly displacing it from shelter and foraging sites amid degraded conditions. The species' small population size, with only 18 individuals ever documented, also resulted in low , heightening vulnerability to environmental stressors and preventing recovery. The Scioto madtom was regularly collected in the and early , indicating a persisting but restricted in Big Darby Creek, but it underwent a dramatic decline, with no confirmed sightings after 1957 despite extensive surveys. As an endemic confined to this single watershed, natural recolonization was impossible once the collapsed.

Extinction

In October 2023, the U.S. Fish and Wildlife Service (USFWS) published a final rule in the delisting the Scioto madtom (Noturus trautmani) from the Endangered Species Act due to , effective November 16, 2023. This decision followed more than 50 years of intensive surveys across its historical range in Big Darby Creek, , where no live individuals have been detected since the last confirmed sighting in 1957. Extensive efforts, including seining, , and snorkeling from 1976 through 2019, sampled tens of thousands of fish but yielded no evidence of the species' persistence, despite targeting suitable habitats during peak activity periods. Supporting the extinction determination, the ' historical has been irreversibly altered by , industrial effluents, agricultural runoff, and channelization, eliminating the clean, rocky riffles essential for its survival. Morphological analyses have confirmed the Scioto 's distinct taxonomic status as a separate from congeners, with the elegant madtom (Noturus elegans) considered its closest relative based on shared characteristics, but no viable populations exist for potential reintroduction efforts. These factors, combined with the absence of any detections in peer-reviewed surveys, indicate that the is beyond reasonable doubt. The delisting underscores the vulnerability of narrow-endemic catfishes to habitat degradation in Midwestern , emphasizing the critical need for enhanced protection of habitats to prevent similar losses among congeners like the freckled madtom (Noturus nocturnus). As Ohio's only endemic fish , the Scioto madtom's serves as a cautionary example of how localized threats can lead to total loss for stream specialists. Preserved specimens, totaling 18 individuals collected between 1943 and 1957, remain in collections such as the Museum of Biological Diversity, providing valuable material for ongoing taxonomic and ecological research. As of 2025, no new evidence of the has emerged, but habitat restoration efforts in the Big Darby Creek watershed continue to support other and aquatic biodiversity.

References

  1. https://www.fws.gov/species/scioto-madtom-noturus-trautmani
  2. https://ohiodnr.gov/discover-and-learn/safety-conservation/about-ODNR/news/scioto-madtom-declared-extinct
  3. https://www.floridamuseum.ufl.edu/fish/catfish/ictaluridae/scioto-madtom/
  4. https://www.fws.gov/press-release/2023-10/21-species-delisted-endangered-species-act-due-extinction
  5. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=164042
  6. https://www.floridamuseum.ufl.edu/fish/catfish/ictaluridae/phylogeny/
  7. https://www.columbusmonthly.com/story/lifestyle/2015/06/22/city-quotient-why-do-we/22795599007/
  8. http://ohiohistoricarchitecture.blogspot.com/2016/01/scioto-or-sciota-or-siota-bit-of-ohio.html
  9. https://www.planetcatfish.com/cotm/cotm.php?article_id=161
  10. https://animalia.bio/tadpole-madtom
  11. https://www.fishbase.se/summary/SpeciesSummary.php?id=3050
  12. https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=22324&context=auk
  13. https://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatget.asp?spid=4575
  14. https://static1.squarespace.com/static/5a9ae7b13c3a53a2a2d55395/t/5d69549358a84800017385bd/1567184027644/Joseph%2BRossano_Vanity_QR%2BFiles.pdf
  15. http://www.fishofohio.com/ohio-fish-scioto-madtom.htm
  16. https://www.encyclopedia.com/environment/science-magazines/scioto-madtom
  17. https://scholarworks.uno.edu/cgi/viewcontent.cgi?article=1056&context=td
  18. https://www.federalregister.gov/documents/2023/10/17/2023-22377/endangered-and-threatened-wildlife-and-plants-removal-of-21-species-from-the-list-of-endangered-and
  19. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.100241/Noturus_trautmani
  20. https://ecos.fws.gov/docs/five_year_review/doc3057.pdf
  21. https://www.federalregister.gov/documents/2021/09/30/2021-21219/endangered-and-threatened-wildlife-and-plants-removal-of-23-extinct-species-from-the-lists-of
  22. https://ecos.fws.gov/docs/tess/species_nonpublish/1522.pdf
  23. https://ohiodnr.gov/go-and-do/plan-a-visit/find-a-property/big-darby-creek-scenic-river
  24. https://s3.amazonaws.com/american-rivers-website/wp-content/uploads/2019/04/02154443/BigDarbyCk_MER2019_Full-Layout_FNL.pdf
  25. http://ecosphere-documents-production-public.s3.amazonaws.com/sams/public_docs/species_nonpublish/2698.pdf
  26. https://bioone.org/journals/southeastern-naturalist/volume-9/issue-3/058.009.0309/Life-History-Attributes-of-the-Imperiled-Frecklebelly-Madtom-Noturus-munitus/10.1656/058.009.0309.short
  27. https://www.jstor.org/stable/2425536
  28. https://mdc.mo.gov/discover-nature/field-guide/ozark-madtom
  29. https://www.fishbase.se/Reproduction/3050
  30. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0633.1994.tb00019.x
  31. https://www.registrelep-sararegistry.gc.ca/virtual_sara/files/cosewic/sr_northern_madtom_e.pdf
  32. https://ncd.fisheries.org/wp-content/uploads/2014/12/Ictalurid_RP-Bulger-and-Wilkinson-et-al.-2002.pdf
  33. http://vtichthyology.blogspot.com/2017/04/mad-about-madtoms-by-don-orth.html
  34. https://downloads.regulations.gov/FWS-R3-ES-2020-0106-0002/content.pdf
  35. https://ecos.fws.gov/docs/five_year_review/doc5986.pdf
  36. https://bioone.org/journals/the-american-midland-naturalist/volume-168/issue-1/0003-0031-168.1.132/The-Influence-of-Channelization-on-Fish-Communities-in-an-Agricultural/10.1674/0003-0031-168.1.132.short
  37. https://www.metroparks.net/blog/requiem-for-a-fish-the-secrets-of-the-scioto-madtom/
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