Diagnostic Description
(
Inglês
)
fornecido por Fishbase
Distinguished by 2 large teeth on the supraoral bar, a large middle tooth on the tongue, 3 points (rarely 2) on each central lateral tooth plate, and the absence of posterial teeth (Ref. 27547). Anterior dorsal fin being lower than posterior, the fins separate in nonbreeding individuals but coming into contact at spawning; caudal fin lobes about equal, lower lobe joined to anal fin; anal fin virtually absent in males (Ref. 27547). Dark brown or brownish gray on sides and back; belly yellowish, silvery around head, gill openings and lower sides; caudal fin has a band of dark pigment inside its margins, symmetrical on each lobe (Ref. 27547). Other diagnostic features: Adults: 11.4-31.1 cm TL. Body wet weight in individuals 17.5-23.0 cm TL, 20-24 g. Body proportions, as percentage of TL (based on 68 specimens measuring 11.7-31.1 cm TL): prebranchial length, 10.9-14.1; branchial length, 7.8-11.8; trunk length, 45.9-55.9; tail length, 24.4-29.5; eye length, 2.3-4.3; disc length, 4.7-7.2. The urogenital papilla length, as a percentage of branchial length, in two spawning males measuring 17.4-18.7 cm TL, 10.3-12.5. Trunk myomeres, 60-71. Dentition: supraoral lamina, 2 unicuspid teeth; infraoral lamina, 7-10 teeth, the lateralmost often bicuspid, the others unicuspid; 3 endolaterals on each side; endolateral formula, typically 2-3-2, very rarely 2-2-2; 3 rows of anterials; first row of anterials, 4 unicuspid teeth; exolaterals absent; posterials absent; transverse lingual lamina, 12-17 unicuspid teeth, the median one greatly enlarged; longitudinal lingual laminae each with 9-12 unicuspid teeth. Velar tentacles, 3-5, with tubercles. Body coloration in marine waters (live), lead gray on dorsal and upper lateral aspects, silvery on the lateral aspect, and white on the ventral aspect. Body coloration (preserved), dorsal and lateral aspects brownish gray and ventral aspect whitish. Lateral line neuromasts unpigmented. Extent of caudal fin pigmentation, 25% to more than 75%. Caudal fin shape, spade-like or rounded. Oral fimbriae, 88-117. Oral papillae, 12-18 (Ref. 89241).
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- Recorder
- Cristina V. Garilao
Life Cycle
(
Inglês
)
fornecido por Fishbase
Probably spawns in gravel, with an activity similar to Lethenteron japonicum (Ref. 1998).
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Migration
(
Inglês
)
fornecido por Fishbase
Anadromous. Fish that ascend rivers to spawn, as salmon and hilsa do. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.
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Trophic Strategy
(
Inglês
)
fornecido por Fishbase
Parasitic adults are found in estuaries and the ocean, migrating to clear gravel riffles of streams to spawn (Ref. 5723). Ammocoetes burrow into the mud where they live for an unknown period and migrate to the sea only after transformation (Ref. 1998). Adults feed by ripping flesh from other fishes (Ref. 2850), ammocoetes feed on microscopic plants and animals just like other members of this family (Ref. 1998). Parasitism can take place at a length of 16.2 cm TL (Ref. 1998). Preyed upon by a number of fishes, e.g. lingcod, and birds (Ref. 1998).
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Biology
(
Inglês
)
fornecido por Fishbase
Anadromous. A permanent freshwater resident population is believed to occur in Morrison Creek, British Columbia. In marine waters, they inhabit surface waters. In fresh waters, they occur in lakes, rivers, and creeks. They leave rivers to enter the sea in late spring or early summer, where they actively feed throughout the summer, and return to the rivers in the fall (Ref. 89241). Parasitic adults are found in estuaries and the ocean, migrating to clear gravel riffles of streams to spawn (Ref. 5723). Ammocoetes burrow into the mud where they live for an unknown period and migrate to the sea only after transformation (Ref. 1998). Adults feed by ripping flesh from other fishes (Ref. 2850), ammocoetes feed on microscopic plants and animals just like other members of this family (Ref. 1998). Parasitism can take place at a length of 16.2 cm TL (Ref. 1998). Preyed upon by a number of fishes, e.g. lingcod, and birds (Ref. 1998). In the Sacramento River, California, the spawning season is thought to be from late April into May. Fecundity, 11,398-37,288 eggs/female. Egg diameter, 0.6-0.7 mm (Ref. 89241). Because of its small size, it is unlikely to pose a threat to economically important fish (Ref. 1998). Utilized fresh or smoked by some cultures (Ref. 27436).
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Importance
(
Inglês
)
fornecido por Fishbase
fisheries: minor commercial; price category: unknown; price reliability:
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Lampetra ayresii
(
Inglês
)
fornecido por wikipedia EN
Lampetra ayresii is a species of lamprey in the family Petromyzontidae. It is also called the river lamprey or western river lamprey. It is found in the eastern Pacific, specifically from Tee Harbor, Juneau in Alaska to the Sacramento–San Joaquin drainage in California, USA.[4][3] It can survive in both marine surface waters and freshwater lakes, rivers, and creeks. In freshwater, it is found typically in the lower portions of large river systems.[5] It is a predatory fish and feeds on fishes in the size range of 10–30 cm. It feeds by attaching to prey using its round, sucker-like mouth.[6] Adult western river lampreys typically grow to about 21 cm (8.3 in) total length (TL), but can reach 31 cm (12 in) TL.[3]
Description
Western river lampreys are noted by their long body, round mouth, and lack of jaws. On their disk-like mouth is two teeth, one tooth on the tongue, 3 points on each central lateral tooth plate, and no posterior teeth.[5] They have no scales, and are typically dark brown in color, with yellow bellies and silver around the head, gill openings and lower sides.[3]
Western river lamprey larvae are very visually similar to Pacific lamprey and western brook lamprey larvae, and are virtually indistinguishable.[5]
Life cycle
Western River Lampreys live on average for 6–7 years, spending most of their life in freshwaters and only living in marine waters for about 10 weeks. Starting their lives as an ammocoete (larva), they burrow into the stream bottom and survive as filter feeders. They can live like this for 2–7 years, after which they begin a metamorphosis into their macropthalmia (juvenile) stage.[5] This metamorphosis starts in the months of July–April, and can take up to 9–10 months, the longest of any lamprey.[6] After metamorphosis, they enter the ocean as adults between the months of May and July. They spend a parasitic feeding phase here for 10 weeks, during which they grow rapidly and reach their maximum size.[6] After their feeding phase, they migrate back to fresh waters to spawning areas. They likely prefer spawning areas upstream and with gravel bottoms. Both sexes will move around stones to construct the nests.[6] Each female will then lay around 11,400 to 37,300 eggs.[3] Adults die after the eggs are laid and fertilized.[5]
Diet
The river lamprey begins as a filter feeder in its ammocoete stage. During this time, they feed on algae and detritus.[5] Parasitism begins in the adult stage and once it has reached 16.2 cm.[3] During this time it feeds on 10–30 cm fishes, most commonly herring and salmon. To feed, it attaches to the back of its prey above the lateral line, using its round mouth. There it sucks on muscle tissue.[6]
References
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Lampetra ayresii: Brief Summary
(
Inglês
)
fornecido por wikipedia EN
Mouth of river lamprey
Lampetra ayresii is a species of lamprey in the family Petromyzontidae. It is also called the river lamprey or western river lamprey. It is found in the eastern Pacific, specifically from Tee Harbor, Juneau in Alaska to the Sacramento–San Joaquin drainage in California, USA. It can survive in both marine surface waters and freshwater lakes, rivers, and creeks. In freshwater, it is found typically in the lower portions of large river systems. It is a predatory fish and feeds on fishes in the size range of 10–30 cm. It feeds by attaching to prey using its round, sucker-like mouth. Adult western river lampreys typically grow to about 21 cm (8.3 in) total length (TL), but can reach 31 cm (12 in) TL.
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Lampetra ayresii
(
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 ayresii: Brief Summary
(
Basco
)
fornecido por wikipedia EU
Lampetra ayresii Lampetra generoko animalia da. Arrainen barruko Petromyzontidae familian sailkatzen da.
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Lampetra ayresii
(
Neerlandês; Flamengo
)
fornecido por wikipedia NL
Lampetra ayresii 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 1870 door Günther.
Bronnen, noten en/of referenties Geplaatst op:
25-02-2013
Dit artikel is een beginnetje over biologie. U wordt uitgenodigd om op bewerken te klikken om uw kennis aan dit artikel toe te voegen.
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Mouth of river lamprey 
