Lethenteron alaskense, Alaskan brook lamprey

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Lethenteron alaskense Vladykov & Kott, 1978

Alaskan brook lamprey
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Lethenteron alaskense
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分类 / Names 俗名 | 同种异名 | Catalog of Fishes(, ) | ITIS | CoL | WoRMS | Cloffa

Petromyzonti > Petromyzontiformes (Lampreys) > Petromyzontidae (Northern lampreys) > Lampetrinae
Etymology: Lethenteron: Greek, letheia = apathetic (lethe = oblivion) + Greek, enteron = intestine (Ref. 45335); referring to the degeneration of the intestine (Ref. 117245).

Environment: milieu / climate zone / depth range / distribution range 生态学

; 淡水 居于水底的; 河川洄游 (Ref. 43939).   溫帶

分布 国家 | FAO区域 | 生态系 | 标本纪录 | Point map | 简介 | Faunafri

North America: Alaska and Kenai peninsulas to Chatanika and Chena rivers near Fairbanks; Martin River, Mackenzie River basin, Northwest Territories.
北美洲: 阿拉斯加州與肯奈半島到 Chatanika 與費班克附近的Chena 河; 馬丁河,麥肯茲河流域,西北地區。

大小 / 重量 / 年龄

Maturity: Lm ?  range ? - ? cm
Max length : 18.8 cm TL 雄鱼/尚未辨别雌雄; (Ref. 43939)

简单描述 型态特徵 | 形态测量图

Adult preserved specimens gray-brown dorsally, white ventrally, with a dark blotch on 2nd dorsal fin; tail dark. Teeth on disk blunt and weakly cornified. Tongue teeth poorly developed and blunt. Typical length 12-17 cm TL (Ref. 43939). Trunk myomeres 66-72 (Ref. 43938, 89241). Other adult diagnostic features: 12.2-18.8 cm TL. Body proportions, as percentage of TL (based on 68 specimens measuring 12.2-18.8 cm TL): prebranchial length, 9.3-14.9; branchial length, 8.7?11.6; trunk length, 45.4-53.5; tail length, 25.7-33.5; eye length, 1.7-3.2; disc length, 3.8-7.3. Urogenital papilla length, as a percentage of branchial length, in a 14.1 cm TL spawning male, 26.9. The shape of the second dorsal fin in spawning males is arch-like and in females triangular. Dentition: supraoral lamina, 2 unicuspid teeth (1 of 34 specimens had 2 additional small unicuspid teeth on the bridge); infraoral lamina, 6-11 teeth, the lateralmost one on each side unicuspid or bicuspid and the internal ones unicuspid; 3 endolaterals on each side; endolateral formula, 2-2-2; 3 rows of anterials; first row of anterials, 3-5 unicuspid teeth; total number of anterials, 23-38 unicuspid teeth; exolaterals absent or one or two unicuspid exolaterals present in each lateral field, exceptionally, one complete row of exolaterals on each side; single row of posterials, 17-24 unicuspid teeth; transverse lingual lamina, 9-15 unicuspid teeth, the median one greatly enlarged; longitudinal lingual laminae each with 6-13 unicuspid teeth. Velar tentacles, 5-7, with tubercles and with the single median tentacle shorter than the lateral tentacles immediately next to it. Body coloration (preserved) in mature adults is gray brown on the upper surface and flanks and whitish on the lower surface. Lateral line neuromasts unpigmented. Gular region unpigmented (2 of 64 specimens had weak pigmentation). Second dorsal fin with a dark blotch near the apex (4 of 64 specimens did not have a blotch). Extent of caudal fin pigmentation, 1% to <25% (17% of specimens), 25% to <75% (36%) or, 75% or more (46%). Caudal fin shape, spade-like. Oral papillae, 18 (Ref. 89241).
成鱼的保存标本灰褐色背面, 腹侧白色的, 在第二背鳍鳍上具有一个黑色斑块; 尾部深色的。 牙齿在圆盘钝与弱的 cornified 。 嘴上的横带有两个尖头。 嘴下的横带 6-11个尖头。 侧齿板 3, 中央的对有两个尖头。 舌齿发展不良的与钝的。 后面的齿呈现。 一些, 增补的边缘齿位于圆盘的侧面区域之上。 典型的长度 12-17 公分TL.(参考文献 43939) 躯干 myomeres 66-72.(参考文献 43938)

生物学特性     字汇 (例如 epibenthic)

Freshwater, in creeks and rivers (Ref. 89241). A non-parasitic lamprey. At about 4 years of age transforms from ammocoete in fall, moves downstream into lakes over winter; spawns the following spring and summer in shallow of lakes and rivers (Ref. 43939). Spawning period between 11 June and 25 September in Naknek River Basin, Alaska. Fecundity, 2,188-3,477 eggs/female. Egg length, 0.9 mm (Ref. 89241).

一个非寄生的八目鳗。 在秋天于大约来自 ammocoete 的 4 岁变换,移动在冬天以来进入湖之内顺流而下; 在湖与河的浅滩中产卵下一个春天与夏天。 (参考文献 43939)

Life cycle and mating behavior 成熟度 | 繁殖 | 产卵场 | | 孕卵数 | 仔鱼

北美洲: 阿拉斯加州與肯奈半島到 Chatanika 與費班克附近的Chena 河; 馬丁河,麥肯茲河流域,西北地區。

主要参考文献 Upload your references | 参考文献 | 合作者 | 合作者

Mecklenburg, C.W., T.A. Mecklenburg and L.K. Thorsteinson, 2002. Fishes of Alaska. American Fisheries Society, Bethesda, Maryland. xxxvii +1037 p. (Ref. 43939)

世界自然保护联盟红皮书 (Ref. 123251)

  数据缺失 (DD) ; Date assessed: 21 February 2012

CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

对人类的威胁

  无害处的





人类利用

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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00117 (0.00051 - 0.00272), b=3.00 (2.80 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
营养阶层 (Ref. 69278):  3.4   ±0.4 se; based on size and trophs of closest relatives
回复力 (Ref. 120179):  低的, 最小族群倍增时间4.5 - 14 年 (tm=tmax=5).
脆弱性 (Ref. 59153):  Moderate to high vulnerability (45 of 100) .