Information on the Western brook lamprey from FishBase

http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Lampetra&speciesname=richardsoni

 

Lampetra richardsoni Western brook lamprey

Lampetra  richardsoni  Vladykov & Follett, 1965
Family:	Petromyzontidae (Lampreys) , subfamily: Petromyzontinae			picture (Laric_u0.gif) by Canadian Museum of Nature, Ottawa, Canada Map
Order:	Petromyzontiformes  (lampreys)
Class:	Cephalaspidomorphi (lampreys)
FishBase name:	Western brook lamprey
Max. size:	15.0 cm TL (male/unsexed; Ref. 5723)
Environment:	demersal; non-migratory; freshwater
Climate:	temperate; 57°N - 43°N
Importance:	fisheries: of no interest; bait: usually
Resilience:
Distribution:   Gazetteer	North America: Pacific slope from McDonald Lake, southeastern Alaska to Umpqua River drainage in Oregon, USA.
Diagnosis:	Distinguished by the very blunt teeth, the lack of a distinct median tooth on the tongue and the lack of posterial teeth (Ref. 27547). Anterior dorsal fin lower than the posterior, arising well back on body; caudal fin joined to both dorsal and anal fins; anal fin small, represented in males by a low ridge (Ref. 27547). Females with a pointed 2nd dorsal fin and a conspicuous anal lobe (Ref. 1998). Back and sides dark gray to brown, ventral side of body whitish (Ref. 27547); fins translucent olive-green and the caudal fin with diffuse black pigment (Ref. 1998).
Biology:	Inhabits gravel riffles and runs of clear, cool streams (Ref. 5723). Ammocoetes occur in muddy and sandy backwaters and pools of streams (Ref. 5723). Ammocoete feed mostly on diatoms but also on other microscopic plant and animal matter (Ref. 1998). Transformed lampreys do not feed at all (Ref. 1998). Nonparasitic (Ref. 5723)
Red List Status:	Not in IUCN Red List  , (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Page, L.M. and B.M. Burr. 1991. (Ref. 5723)
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