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Petromyzonti >
Petromyzontiformes (Lampreys)
七鰓鰻目 (Lampreys) >
Petromyzontidae (Northern lampreys)
七鰓鰻科 (Northern lampreys) > Lampetrinae
Etymology: Entosphenus: entos (Gr.), within; sphenos (Gr.), wedge, referring to wedge-shaped tooth within mouth on tongue of E. tridentatus. (See ETYFish); tridentatus: tri- (L.), three; dentatus (L.), toothed, referring to “three conspicuous and contiguous teeth” on supraoral tooth plate [name coined by surgeon-naturalist Meredith Gairdner (1809-1837), who is sometimes credited as the author]. (See ETYFish).
More on author: Richardson.
Issue
The landlocked population in the Sprague River, Klamath River Basin, Oregon, appears distinctive from other conspecifics in a number of characters and would benefit from a closer examination. For example, four of the five specimens from the Sprague River examined by Vladykov and Kott (1979a) did not possess wings on their velar apparatus and had counts between 7-10 tentacles, while typically, E. tridentatus possesses wings and 11-18 tentacles. Hubbs (1924) suggested that the population in Goose Lake, Oregon (the lake also straddles California) represented a separate but unnamed race. This requires further investigation (Ref.89241). Consequently, Entosphenus astori (Girard, 1858) is questionably a synonym of Entosphenus tridentatus (Richardson, 1836) (Ref. 89241).
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋; 淡水; 半鹹淡水 居於水底的; 溯河洄游 (Ref. 89241); 深度上下限 0 - 1508 m (Ref. 96339). 溫帶; 65°N - 32°N, 133°E - 114°W
North Pacific: Bering Sea coasts of Asia and Alaska southward to the Yuhutu River, Hokkaido, northern Japan and Punta Canoas, central Baja California, Mexico. The populations were, at one time, split into two groups (Ref. 10015) as Entosphenus tridentatus tridentatus which ranged from the Columbia River to Alaska, and Entosphenus tridentatus ciliatus which ranged from Klamath River southwards (Ref. 1998). This division no longer holds (Ref. 1998). Freshwater resident populations exist in Culrus Lake and the Columbia River, British Columbia, the Sprague River in Oregon, the Goose Lake in Oregon/California, and the Klamath and Shasta rivers and Copco Lake in California (Ref. 12269).
北太平洋: 亞洲的白令海海岸與阿拉斯加州向南至 Yuhutu 河，北海道，日本北部與 Punta Canoas ，中央的墨西哥的下加利福尼亞。 族群是，同時，分割為如 叉牙楔齒七鰓鰻〔Entosphenus tridentatus〕 tridentatus 的二個群 (參考文獻 10015) 範圍從到阿拉斯加州的哥倫比亞河 , 與 叉牙楔齒七鰓鰻〔Entosphenus tridentatus〕 ciliatus 範圍從克拉瑪斯河南方.(參考文獻 1998) 這個部份已經不存在.(參考文獻 1998) 淡水居留族群在 Culrus 湖與哥倫比亞河，卑詩省存在, 在奧勒岡州的 Sprague 河, 鵝湖在奧勒岡州/加州, 與在加州的克拉瑪斯河與沙斯塔山河與 Copco 湖.(參考文獻 12269)
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 76.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 2850); common length : 41.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 12193); 最大體重: 500.00 g (Ref. 27436); 最大年齡: 9 年 (Ref. 72464)
Characterized by the presence of 3 (rarely 2) large sharp teeth on the supraoral bar and three sharp points on each of the central lateral tooth plates. Dorsal fins arise far back on the body, the anterior fin lower and shorter, higher in males; lower lobe of caudal fin larger than upper, the lobes joined to dorsal and anal fins; anal fin rudimentary, virtually absent in males. Adults from the sea blue-black to greenish above, silvery to white below; spawning adults become reddish brown (Ref. 27547). Other diagnostic characters: oral disc as wide or wider than head; usually 64-71 trunk myomeres; dark blue or brown above, light or silver below (Ref. 86798).
Adults: 9.6-80.0 cm TL. Specimens 38-62 cm TL weigh 120-510 g wet weight. Body proportions, as percentage of TL (based on 274 specimens measuring 9.6-71.6 cm TL): prebranchial length, 9.8-18.0; branchial length, 7.8-12.6; trunk length, 40.3-54.0; tail length, 23.6-34.9; eye length, 1.3-4.5; disc length, 4.6-9.1. The urogenital papilla length, as a percentage of branchial length, in two spawning males measuring 21.1-21.7 cm TL, 12.0-12.5. Trunk myomeres, 60-71 (may be as low as 57 and as high as 78). Dentition: marginals, 48-62; supraoral lamina, 3 unicuspid teeth, the median one being smaller; infraoral lamina, 5-6 unicuspid teeth, predominantly 5; 4 endolaterals on each side; endolateral formula, typically 2-3-3-2, the first endolateral rarely unicuspid and the second and third endolaterals rarely bicuspid; 2 rows of anterials; first row of anterials, either 1 or 5 unicuspid teeth; exolaterals absent; 1 row of posterials, 12-21 teeth, of which 0-5 may be bicuspid and the remainder unicuspid; transverse lingual lamina, 14-23 unicuspid teeth, the median one slightly enlarged; longitudinal lingual laminae parentheses-shaped, each with 20-27 unicuspid teeth [50-63 according to McPhail and Lindsey (1970)]. Velar tentacles, 10-18, with tubercles; the dorsal wings may each consist of up to 5-6 long tentacles that reach the median tentacle. Median tentacle about the same length as the lateral ones immediately next to it. Four of five specimens from the Sprague River did not possess wings and had 7-10 tentacles. Body coloration (preserved), dorsal, lateral, and ventral aspects bluish gray in older individuals and ventral aspect either dark gray or almost white in recently metamorphosed individuals. Lateral line neuromasts unpigmented or darkly pigmented. Caudal fin pigmentation, +++. Caudal fin shape, rounded or spade-like. Oral fimbriae, 94-105. Oral papillae, 12-18 (Ref. 89241).
特徵為出現了 3(很少地 2) 大的銳利牙齒在嘴上的橫帶與三個點尖每個有中央的側齒板.(參考文獻 27547) 背鰭出現相距遙遠地在身體，前面的鰭上低而比較短的, 比較高的在雄性中; 尾鰭的低葉大於上面的, 葉連到了背鰭與臀鰭; 臀鰭不發達的, 事實上不存在於雄性.(參考文獻 27547) 成魚從藍黑色到呈綠色的上方, 銀色到腹面白色的; 產卵期的成魚變成紅褐色。 (參考文獻 27547)
Anadromous, but also a number of permanent freshwater resident populations (Cultus Lake, British Columbia; Sprague River, Klamath River Basin, Oregon). In marine waters, adults mostly inhabit the mesopelagic zone down to 800 m depth and have been documented as far as 117 km off the coast of Oregon. In fresh waters, ammocoetes and adults inhabit lakes, rivers, and creeks. Ammocoetes occur in soft sediments in shallow areas along stream banks (Ref. 89241); in silt, mud, and sand of shallow eddies and backwaters of streams (Ref. 5723). Spawning adults are found in gravel riffles and runs of clear coastal streams; feeding adults usually in the ocean, but landlocked populations occur (Ref. 1998). Stops feeding once upstream spawning migration is underway (Ref. 1998). Parasitic adults attach themselves to the side or undersurface of its prey, from which it draws blood and body fluids as food. Preys on fishes and sperm whales (Ref. 6885). Adults are found in the Strait of Georgia from December to mid-June. The duration of the feeding phase at sea has been estimated at 20-42 months. In British Columbia, return to fresh water begins as early as April and is completed by September. In the Columbia River, prior to the completion of the Grand Coulee Dam in 1941, spawning migrations of 800 km up to Kettle Falls, Washington occurred. In order to cross barriers such as falls, they use their suctorial disc to attach to the vertical surfaces and slowly make their way up. In British Columbia spawning is in June to the end of July, while in Oregon, it begins in May at water temperatures of 10-15 °C and continues through July. Fecundity, 98,300-238,400 eggs/female in Oregon populations from Clear, Trout, and Cow creeks, respectively, in the John Day, Molalla, and Umpqua river basins. Death of spawners follows 3-36 days after spawning. Eggs are eaten by two species of fish in the Umatilla River, Oregon (Ref.89241). Rarely consumed as food; prepared fresh or smoked (Ref. 6885). Sometimes processed into meal (Ref. 27436). The Native American tribes of the mid-Columbia River Plateau have an ongoing tradition dating back hundreds of years of harvesting Pacific Lamprey. The adults are caught either by hand or dipnet in areas where they congregate prior to spawning. They are prepared for human consumption either by drying or roasting. Caloric values for Pacific Lamprey range from 5.9 to 6.3 kcal/g wet weight. Their oil is also extracted and used for medicinal purposes. Ammocoetes are used as bait for introduced Micropterus dolomieu in the John Day River, Oregon. In 1812, Americans of European descent obtained Pacific Lamprey from the Umatilla tribe of Oregon for the purposes of consumption. In the early 1900s, fur trappers utilized Pacific Lamprey as bait for coyotes. A fishery for adult lamprey has existed at Willamette Falls on the Willamette River, Oregon at least since 1913. That year, 24.5 metric tons were harvested and ground into fishmeal for young hatchery salmon. Between 1943 and 1949, 740 metric tons in total were harvested and used for vitamin oil, food for livestock, poultry, and fishmeal. In 1994, about 1.8 metric tons were exported to Europe for human consumption. The North Carolina Biological Supply House regularly collects adults from this locality for use as teaching material (Ref.89241). The effects of Pacific lamprey attacks on commercial species needs further studies (Ref. 6885).
產卵的成魚被發現於碎石激流與清潔的水流海岸的溪流; 成魚通常在大海中覓食, 但是陸封的族群出現;(參考文獻 1998) 在淺水渦流中的灰、泥及砂與溪流中的死水中的 ammocoetes.(參考文獻 5723) 寄生的成魚把自己吸附到它的獵物的側面或下面, 從它平局血液與體液當作食物。 魚與抹香鯨的獵物.(參考文獻 6885) 溯溪產卵開始即停止進食.(參考文獻 1998) 很少被當作食物; 製成煙燻或新鮮食用.(參考文獻 6885) 有時加工成一餐。 (參考文獻 27436) 太平洋八目鰻攻擊對經濟魚種的影響需要更高深的研究。 (參考文獻 6885)
In the spring following the migration into fresh water, a male and a female dig a nest. In the spawning act, the female attaches herself to a rock and the male fastens its sucker on the head of the female and coils around the female. The two then vibrate and eggs and sperms are released (Ref. 27547). Males spawn with more than one female in different nests (Ref. 1998). Adults die 1-14 days after spawning (Ref. 1998), while other sources say adults die 3-36 days after spawning (Ref. 89241). Larvae remain buried in the stream bottom for up to 5 or 6 years and return to the sea after changing into the adult form (Ref. 1998). The parasitic adults spend 12-20 months in the sea before moving upstream to spawn (Ref. 1998).北太平洋: 亞洲的白令海海岸與阿拉斯加州向南至 Yuhutu 河，北海道，日本北部與 Punta Canoas ，中央的墨西哥的下加利福尼亞。 族群是，同時，分割為如 叉牙楔齒七鰓鰻〔Entosphenus tridentatus〕 tridentatus 的二個群 (參考文獻 10015) 範圍從到阿拉斯加州的哥倫比亞河 , 與 叉牙楔齒七鰓鰻〔Entosphenus tridentatus〕 ciliatus 範圍從克拉瑪斯河南方.(參考文獻 1998) 這個部份已經不存在.(參考文獻 1998) 淡水居留族群在 Culrus 湖與哥倫比亞河，卑詩省存在, 在奧勒岡州的 Sprague 河, 鵝湖在奧勒岡州/加州, 與在加州的克拉瑪斯河與沙斯塔山河與 Copco 湖.(參考文獻 12269)
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)
人類使用
漁業: 自給性漁業; 誘餌: occasionally
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Estimates based on models
Preferred temperature (Ref.
123201): 0.8 - 6.3, mean 2.7 °C (based on 270 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5156 [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).
營養階層 (Ref.
69278): 4.5 ±0.80 se; based on food items.
回復力 (Ref.
120179): 低的, 最小族群倍增時間4.5 - 14 年 (tmax=9; tm 6-8; Fec=10,000-106,000 (semelparous)).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (50 of 100).
