Ichthyomyzon gagei, Southern brook lamprey

Ichthyomyzon gagei Hubbs & Trautman, 1937

Southern brook lamprey
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Ichthyomyzon gagei
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> Petromyzontiformes (Lampreys) > Petromyzontidae (Northern lampreys) > Petromyzontinae
Etymology: Ichthyomyzon: ichthys, fish; myzon (Gr.), to suck (borrowed from Petromyzon), i.e., a sucking fish, referring to their suctorial behavior (See ETYFish)gagei: In honor of American histologist and embryologist Simon Henry Gage (1851-1944), Cornell University (Ithaca, New York, USA), “one of the foremost students of the lampreys,” who brought this “interesting and distinct species” to the authors’ attention (See ETYFish).
Eponymy: Simon Henry Gage (1851–1944) was a histologist and embryologist at Cornell University, which awarded his first degree (1877). [...] (Ref. 128868), visit book page.
More on authors: Hubbs & Trautman.

Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet Ökologie

; süßwasser demersal; potamodrom (Ref. 126106). Temperate; 37°N - 31°N

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North America: Mississippi River basins, Tennessee River drainage and Gulf of Mexico Coast drainages from Ochlockonee River in Florida to Galveston Bay in Texas, USA.

Größe / Gewicht / Alter

Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 17.0 cm TL Männchen/unbestimmt; (Ref. 5723); common length : 12.0 cm TL Männchen/unbestimmt; (Ref. 12193)

Kurzbeschreibung Bestimmungsschlüssel | Morphologie | Morphometrie

Distinguished by the following characters: Oral disc narrower than head; teeth blunt and poorly developed; usually 52-56 trunk myomeres; black on lateral-line pores; one slightly notch dorsal fin (Ref. 86798). Other adult diagnostic features: 8.6-12.9 cm TL. Body proportions, as percentage of TL (based on 35 specimens measuring 8.6-12.9 cm TL): prebranchial length, 8.3-11.2; branchial length, 8.3-11.1; trunk length, 47.0-56.0; tail length, 25.6-33.3; eye length, 1.1-2.1; disc length, 3.8-6.5. Urogenital papilla length, as a percentage of branchial length, in 6 spawning males measuring 9.2-11.1 cm TL, 22.7-33.3. Trunk myomeres, 50-56, with a strong mode at 53. Dentition: supraoral lamina, 2-4 teeth, usually 2; infraoral lamina, 5-10 unicuspid teeth, usually 8-9; 4-5 endolaterals on each side; 0-8 bicuspid endolaterals in total, the other endolaterals, unicuspid; 3-4 rows of anterials; first row of anterials, 3 unicuspid teeth; 3-4 rows of exolaterals on each side; 2 rows of posterials; first row of posterials, 9 unicuspid teeth; crest of transverse lingual lamina linear to weakly w-shaped, with no apparent cusps; longitudinal lingual laminae each with undetermined number of unicuspid teeth. Velar tentacle number unrecorded. Body coloration (preserved) distinctly bicolored, with the dorsal aspect dark and the ventral aspect light. Lateral line neuromasts darkly pigmented. Caudal fin pigmentation unrecorded. Caudal fin shape, rounded. Oral fimbriae number unrecorded. Oral papillae number unrecorded (Ref. 89241).
Body shape (shape guide): eel-like.

Biologie     Fachlexikon (Englisch) (z.B. epibenthic)

Freshwater (Ref. 89241). Adults inhabit gravel and sand riffles, and runs of creeks and small rivers. Ammocoete larvae occur in flowing water near sand bars and debris. Non-parasitic (Ref. 5723). Average fecundities varied from 713-2,448 eggs/female among 19 localities across the distributional range (Ref. 89241).

Lebenszyklus und Paarungsverhalten Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven

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Page, L.M. and B.M. Burr, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref. 5723)

IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))

  nicht bedroht (LC) ; Date assessed: 17 February 2012

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless





Nutzung durch Menschen

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Schätzungen auf der Grundlage von Modellen

Phylogenetischer Diversitätsindex
(Ref. 82804)
PD50 = 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00107 (0.00040 - 0.00285), b=3.03 (2.80 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophische Ebene
(Ref. 69278)
4.1   ±0.7 se; based on size and trophs of closest relatives
Widerstandsfähigkeit
(Ref. 120179)
niedrig, Verdopplung der Population dauert 4,5 - 14 Jahre. (Semelparous species, assuming tm (= tmax) > 4).
Anfälligkeit der Fischerei
(Ref. 59153)
Moderate vulnerability (36 of 100). 🛈