分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Petromyzonti >
Petromyzontiformes (Lampreys) >
Petromyzontidae (Northern lampreys) > Lampetrinae
Etymology: Lampetra: lambo (L.), to lick; petra (Gr.), rock or stone, referring to their suctorial behavior (adults attach to rocks during nest building and mating). (See ETYFish); richardsoni: In honor of surgeon-naturalist John Richardson (1787-1865), “author of several important works on fishes from North America”. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 居于水底的; 非迁移的. 溫帶; 57°N - 43°N
North America: Pacific slope from McDonald Lake, southeastern Alaska to Umpqua River drainage in Oregon, USA.
北美洲: 太平洋斜坡從麥當勞湖，阿拉斯加州東南方到美國奧勒岡州的安魁河流域。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 17.3 cm TL 雄鱼/尚未辨别雌雄; (Ref. 43939)
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). Oral disc narrower than head; usually 58-67 trunk myomeres; caudal fin with dark spot (Ref. 86798). Other adult diagnostic features: 8.0-15.4 cm TL. Body proportions, as percentage of TL (based on 45 specimens measuring 10.1-15.4 cm TL): prebranchial length, 10.4-14.0; branchial length, 8.3-10.8; trunk length, 44.7-53.1; tail length, 25.2-30.4; eye length, 2.0-2.7; disc length, 4.1-7.9. Urogenital papilla length, as a percentage of branchial length, in 26 spawning males measuring 12.2-15.1 cm TL, 17.6-30.8. Trunk myomeres, 60-67. Dentition: supraoral lamina, 2 unicuspid teeth; infraoral lamina, 7-10, usually 7 unicuspid teeth; 3 endolaterals on each side; endolateral formula, typically 1-2-1 (15 cases), 2-2-1 (12), or 2-2-2 (10), and rarely 2-3-2 (5) and 2-3-1 (1); 2 rows of anterials; first row of anterials, 4-6 unicuspid teeth; exolaterals absent; posterials usually absent; transverse lingual lamina, 5-11 unicuspid teeth, the median one enlarged or only the median enlarged tooth is present; longitudinal lingual laminae cusps too small to count. Velar tentacles, 5-6, with tubercles. Body coloration (preserved), dorsal and lateral aspects grayish, ventral surface whitish. Lateral line neuromasts unpigmented. Extent of caudal fin pigmentation, 75% or more. Fleshy tissues around the lingual laminae unpigmented. Caudal fin shape, rounded or spade-like. Oral fimbriae, 93 (Ref. 89241).
区别的特徵为非常钝的齿了, 那在舌与缺乏后面的齿上没有一个明显的中央牙齿.(参考文献 27547) 前面的背鳍低于后面的, 出现在身体正后方; 尾鳍连到了背鳍与臀鳍; 臀鳍小的, 雄性出现一个低的脊.(参考文献 27547) 雌鱼有一个尖的第二背鳍鳍与一个显着的尾鳍叶。 (参考文献 1998) 背面与侧边深灰色到褐色的, 身体的腹侧边微白色的;(参考文献 27547) 鳍半透明的橄榄绿色的而且尾鳍有扩散的黑色素.(参考文献 1998)
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, 89241). Spawning period in early May in British Columbia as evidenced by spent females being collected on 8 May. Spawning occurs in redds and fertilized eggs collected on 8 May hatched in about 28 days at water temperatures between 10-12 °C. Eggs are greenish. In the state of Washington, in the early 1900s, ammocoetes were sold at $1.50 to $1.75 US per dozen to use as bait for sportfishes (Ref. 89241).
栖息于碎石激流与清洁的水流，冷水流。 (参考文献 5723) Ammocoetes 出现在泥泞多沙的洄水区与溪中的水潭。 (参考文献 5723) Ammocoete 大部分吃硅藻也捕食其他的微小动植物.(参考文献 1998) 变态后的八目鳗根本不进食。 (参考文献 1998) 非寄生的.(参考文献 5723)
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
Nest mostly made by males; may be shared by 6 pairs at a time; occupied by different groups at different times. Male carries out 'sliding-feeling' courtship by sliding up the body of the female with the disc gently touching her body. The male then attaches itself to her head and coils around her. The pair vibrates when the eggs and sperms are released.北美洲: 太平洋斜坡從麥當勞湖，阿拉斯加州東南方到美國奧勒岡州的安魁河流域。
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)
人类利用
渔业: 没有兴趣; 诱饵: usually
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5002 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00126 (0.00056 - 0.00284), b=2.99 (2.80 - 3.18), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
营养阶层 (Ref.
69278): 2.4 ±0.23 se; based on food items.
回复力 (Ref.
120179): 低的, 最小族群倍增时间4.5 - 14 年 (Semelparous species, assuming tm (= tmax) > 4).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
