Diagnostic Description
(
Inglês
)
fornecido por Fishbase
Characterized by having oral disc narrower than head; teeth extremely degenerated; usually 52-59 trunk myomeres; coloration consisting of light tan to silver gray above, yellow or white below; and yellow or gray fins (Ref. 86798). Other adult diagnostic features: 7.5-17.8 cm TL and wet weight 0.9-3.0 g for individuals 8.2-12.0 cm TL. Body proportions, as percentage of TL (based on 166 specimens measuring 7.5-16.5 cm TL): prebranchial length, 6.9-13.0; branchial length, 8.4-12.8; trunk length, 42.8-57.3; tail length, 23.4-35.0; eye length, 0.9-2.1; disc length, 2.8-6.7. Urogenital papilla length, as a percentage of branchial length, in 71 spawning males measuring 10.2-14.6 cm TL, 23.1-60.0. Trunk myomeres, 53-62. Dentition: marginals, 63-67; supraoral lamina, 2 unicuspid teeth; infraoral lamina, 5-13 unicuspid teeth; 3-4 endolaterals on each side; endolateral formula, 2-1-2 with variations, including 1-1-1, 2-3-2 and 2-3-3; 2 rows of anterials; first row of anterials, 4-5 unicuspid teeth (some teeth may even be found on the anterior field between the supraoral lamina and the first row of anterials); 1-2 rows of exolaterals on each side; 0-1 row of posterials; first row of posterials, when present, may be complete (13% of individuals) or incomplete (87%) with 1-22 unicuspid teeth; transverse lingual lamina, undetermined number of unicuspid teeth, the median one of undetermined size; longitudinal lingual laminae each with an undetermined number of unicuspid teeth. Velar tentacles, 3-5, with tubercles. Body coloration (live) of spawning individuals, dorsal aspect mottled gray-brown and ventral aspect light silvery-yellow. Lateral line neuromast pigmentation unrecorded. Caudal fin pigmentation, darkly pigmented, but the extent of coverage has not been reported. Caudal fin shape, spade-like. Oral fimbriae number unrecorded. Oral papillae, 12-20 (Ref. 89241).
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Life Cycle
(
Inglês
)
fornecido por Fishbase
The female attaches with her oral disc to a rock at the upstream end of the nest. The male attaches to the back of her head using his oral disc and wraps his tail around her trunk region in such a way as to have each others urogenital papilla in close proximity and through muscular contraction of his body assists in the extrusion of the eggs. They vibratevigorously for a few seconds. This results in the release of their gametes and disturbance of the substrate, which partially buries the fertilized eggs (Ref. 89241). One female pairs up with up to two males (Ref. 89241).
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Trophic Strategy
(
Inglês
)
fornecido por Fishbase
Inhabit clean, clear gravel riffles and runs of creeks and small rivers (Ref. 3814). In Delaware, occurs in small streams with relatively slow current, usually 0.03 m/s or less, with water temperatures throughout the year 4.0-19.0 °C, dissolved oxygen 5.6-14.0 ppm, and pH 6.0-7.3. In Kentucky, occurs in small to medium size, clear creeks with sand-gravel substrate, either among debris (adults) or in mud banks with silt deposits (ammocoetes) (Ref. 89241). Ammocoete larvae occur in spring-fed wetlands and quiet pools and backwaters of small, sandy or muddy bottom streams (Ref. 3814). Larval period varies from 2.5 to at least 5.4 yrs. Metamorphosis in early September and maybe even mid- to late August. In Maryland, metamorphosis has been reported as late as February (Ref. 89241). Adults enter riffle areas to spawn at 10-16°C water temperature (Ref. 10294). Non-parasitic (Ref. 3814). Fecundity, 572-3,816 eggs/female and relative fecundity, 373-687 eggs/g body weight. Egg diameter, 0.66-1.36 mm. In Delaware, spawning occurs at the end of March at a water temperature of 13.8 °C, dissolved oxygen 11.6 ppm, and pH 6.6. In Maryland, spawning occurs from 10 April to 10 May when the water reaches 16 °C. Both sexes participate in nest building. Stones up to 2.5 cm in diameter are moved using their oral disc. Nests are circular or oval, 15-2 cm in diameter and about 7 cm deep. They are built in streams 4.5-.3 m wide and 15-1 cm deep with a substrate of sand and fine gravel. From 2-5 lampreys share a nest. Up to two males will spawn with one female. Average size at hatching, 3.4 mm TL. Modal length at age 1 is 27-8 mm TL and at age 2 is 50 mm TL. Most growth occurs during the spring season, intermediate growth in summer and fall and very little during winter. In Kentucky, mean length at age 1 is 39 mm TL, at age 2 is 65 mm TL, and at age 3 is 89 mm TL (Ref. 89241).
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Biology
(
Inglês
)
fornecido por Fishbase
Freshwater, in streams and lakes (Ref. 89241). Inhabit clean, clear gravel riffles and runs of creeks and small rivers (Ref. 3814). In Delaware, occurs in small streams with relatively slow current, usually 0.03 m/s or less, with water temperatures throughout the year 4.0-19.0 °C, dissolved oxygen 5.6-14.0 ppm, and pH 6.0-7.3. In Kentucky, occurs in small to medium size, clear creeks with sand-gravel substrate, either among debris (adults) or in mud banks with silt deposits (ammocoetes) (Ref. 89241). Ammocoete larvae occur in spring-fed wetlands and quiet pools and backwaters of small, sandy or muddy bottom streams (Ref. 3814). Larval period varies from 2.5 to at least 5.4 yrs. Metamorphosis in early September and maybe even mid- to late August. In Maryland, metamorphosis has been reported as late as February (Ref. 89241). Adults enter riffle areas to spawn at 10-16°C water temperature (Ref. 10294). Non-parasitic (Ref. 3814). Fecundity, 572-3,816 eggs/female and relative fecundity, 373-687 eggs/g body weight. Egg diameter, 0.66-1.36 mm. In Delaware, spawning occurs at the end of March at a water temperature of 13.8 °C, dissolved oxygen 11.6 ppm, and pH 6.6. In Maryland, spawning occurs from 10 April to 10 May when the water reaches 16 °C. Both sexes participate in nest building. Stones up to 2.5 cm in diameter are moved using their oral disc. Nests are circular or oval, 15-2 cm in diameter and about 7 cm deep. They are built in streams 4.5-.3 m wide and 15-1 cm deep with a substrate of sand and fine gravel. From 2-5 lampreys share a nest. Up to two males will spawn with one female. Average size at hatching, 3.4 mm TL. Modal length at age 1 is 27-8 mm TL and at age 2 is 50 mm TL. Most growth occurs during the spring season, intermediate growth in summer and fall and very little during winter. In Kentucky, mean length at age 1 is 39 mm TL, at age 2 is 65 mm TL, and at age 3 is 89 mm TL (Ref. 89241).
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Least brook lamprey
(
Inglês
)
fornecido por wikipedia EN
The least brook lamprey (Lampetra aepyptera) is a common, non-parasitic lamprey distributed in the Mississippi River watershed, and a limited range along the Atlantic coast.[1]
Description
As with all lamprey species, the least brook lamprey spends the majority of its life as a worm-like ammocoete. The ammocoete (5 mm–20 cm) is clear with a pigmented head when small (<5 cm), but becomes a dark/golden brown as it matures. Ammocoetes have pigmented eye spots located in the head that can detect light and dark. After metamorphosis from the ammocoete into the juvenile stage, the lamprey becomes a golden color with yellow-tinged fins. Teeth (often used to identify lamprey to species) develop on the oral disk, and the eyes develop from the eye spots at metamorphosis. Least brook lamprey do not have a juvenile period (see life cycle), and maturation continues directly into the adult stage, at which point the body swells as the gonads are developed. Populations are likely physically distinct depending on the locality where they are captured. Therefore, the physical description provided herein is only a general description. Instead, the tooth arrangements in adults, which do not vary as much between populations, should be used to identify this species positively. Ammocoetes should be tentatively identified based on prior collection history for the area in which they were found unless they are positively identified by an expert.
Life cycle
Adults spawn in the spring in the headwaters of streams. The males (aided by females) construct small nests by picking up pebbles with their oral disks and moving them to form the rims of shallow depressions. The sticky eggs are deposited in the nest and adhere to the sand and gravel. Multiple adults may spawn in the same nest, and multiple males may spawn with the same female. As with all lamprey species, adults die after spawning.
When they first hatch, embryos remain in the nest for up to one month before they mature into ammocoetes. Ammocoetes leave the nest and seek out slow-flowing water in sandy areas, where they burrow and begin feeding. Ammocoetes live burrowed for 3–7 yr, feeding on microscopic plant and animal life and detritus (decaying matter). Mature ammocoetes will begin metamorphosis in the late summer through the fall in preparation for spawning the following year. Metamorphosing and adult brook lampreys cannot eat, since they have nonfunctional intestines, and only live for four to six months.
References
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Least brook lamprey: Brief Summary
(
Inglês
)
fornecido por wikipedia EN
The least brook lamprey (Lampetra aepyptera) is a common, non-parasitic lamprey distributed in the Mississippi River watershed, and a limited range along the Atlantic coast.
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Lampetra aepyptera
(
Basco
)
fornecido por wikipedia EU
(RLQ=window.RLQ||[]).push(function(){mw.log.warn("Gadget "ErrefAurrebista" was not loaded. Please migrate it to use ResourceLoader. See u003Chttps://eu.wikipedia.org/wiki/Berezi:Gadgetaku003E.");});
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Lampetra aepyptera: Brief Summary
(
Basco
)
fornecido por wikipedia EU
Lampetra aepyptera Lampetra generoko animalia da. Arrainen barruko Petromyzontidae familian sailkatzen da.
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Lampetra aepyptera
(
Francês
)
fornecido por wikipedia FR
Lampetra aepyptera (Abbott 1860) est une espèce de lamproies non parasitaires de la famille des Petromyzonidae. Les adultes peuvent atteindre entre 7.5-17.8 cm en longueur.
Étymologie
-
Lampetra : du latin, lambendis petris, qui signifie sucer des rochers
- Aepyptères du latin: d’après les mots aepy, signifiant haut et ptéron, signifiant aileron ou aile
Description
Les agnathes ne sont pas considérés comme des poissons (ne possèdent pas de mâchoires mais une ventouse, pas d'écailles, ni nageoires paires, ni de colonne vertébrale osseuse).
Comme dans les autres espèces de lamproies, l'alevin présente un régime zooplanctonique, mais Lampetra aepyptera n'est pas un ectoparasite au stade adulte, une charactéristique rare chez les lamproies.
Cette espèce peut être différencié d'autres lamproies par la nageoire dorsale qui est profondément cranté apparaissant comme deux nageoires dorsales contiguës. Le disque oral est plus étroit que la tête et avec des dents extrêmement dégénérées. Pas de couleur noire sur les pores latéraux.
Coloration: brun clair à gris argenté sur la face dorsale, jaune ou blanc en-dessous; nageoires jaunes ou grises
Leur reproduction est dioïque[1].
Les adultes peuvent atteindre généralement entre 7.5-17.8 cm en longueur.
La position taxonomique de cette espèce est toujours incertaine à cause de sa morphologie des dents. Elle est provisoirement placé dans le genre Lampetra mais d’autres études futures pourraient montrer qu’elle devrait être placé de manière plus appropriée dans le genre Okkelbergia Creaser et Hubbs 1922. C’est la seule espèce du genre qui possède à la fois des dents exolatérales et postéliales[2].
Synonymes: Lethenteron meridionale (Vladykov, Kott & Pharand-Coad, 1975) ; Ammocoetes aepyptera (Abbott, 1860) ; Least brook lamprey (anglais)[3]
Distribution, habitat
Lampetra aepyptera est une espèce d'eau douce trouvée dans des lacs et des ruisseaux avec un courant d'eau relativement lent.
Cette espèce est présente dans le bassin versant du Mississippi et peut être rencontré plus rarement le long de la côte de l’Atlantique.
D'autres rencontres ont été documentés dans le fleuve d'Ohio (Portland, Ohio, USA) ainsi que dans le "Blue Springs Creek" (Tennessee River Basin, Tennessee, USA)
Milieu de vie: Température modérée: 4°C - 19°C
Notes et références
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Lampetra aepyptera: Brief Summary
(
Francês
)
fornecido por wikipedia FR
Lampetra aepyptera (Abbott 1860) est une espèce de lamproies non parasitaires de la famille des Petromyzonidae. Les adultes peuvent atteindre entre 7.5-17.8 cm en longueur.
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Lampetra aepyptera
(
Neerlandês; Flamengo
)
fornecido por wikipedia NL
Lampetra aepyptera is een kaakloze vissensoort uit de familie van de prikken (Petromyzontidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1860 door Abbott.
Bronnen, noten en/of referenties Geplaatst op:
25-02-2013
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