Окружающая среда: среда / климатическая зона / пределы глубины / диапазон распространения
экология
; пресноводный; солоноватоводный демерсальный; мигрирует в реке (Ref. 116361); пределы глубины 5 - 9 m (Ref. 117245). Temperate; 60°N - 30°N, 100°W - 71°W
North America: St. Lawrence-Great Lakes, Hudson Bay, and Mississippi River basins.
Длина при первой зрелости / Размер / Вес / Возраст
половая зрелость: Lm 99.7, range 90 - 120 cm
Max length : 274 cm TL самец/пол неопределен; (Ref. 5723); common length : 97.5 cm TL самец/пол неопределен; (Ref. 12193); наибольший вес (опубликованные данные): 125.0 kg (Ref. 3672); наибольший возраст (опубликованны данные): 152 годы (Ref. 72475)
Single row of preanal shields. Soft area on the top of the head absent and black viscera. Large blotches present on anterior half of upper surface of snout and on back. Lower surface whitish (Ref. 37032). Anal fin origin behind dorsal fin origin; scutes on back and along side same color as skin (Ref. 86798).
Body shape (shape guide): elongated.
Adults inhabit bottom of lakes and large rivers (Ref. 10294), usually in 5-9 m depth, over mud, sand, and gravel. Occasionally enters brackish water. A specimen caught in 1952 was reputed to have been 152 years old (Ref. 6866). Search for food, with the aid of the sensory ability of the barbels, by constantly moving close to the substrate. Omnivorous, virtually anything edible that enters the mouth is sucked up and consumed. The food is worked or pulled in the mouth, often partly ejected and sucked in again (Ref. 1998). Spawning sites are rocky and boulder filled areas along the outside bend of rivers (Ref. 41542). In the 1800s, it was extensively exploited for oil to fire boilers on steamboats, animal feed and fertilizer. Later is was high-valued as smoked, caviar and isinglass (Ref. 117245). In 1951, Canada, 2,000 lbs. of caviar were made from the eggs (Ref. 37032). It continous to be an important source of food for Indigenous people in North America (Ref. 117245). Threatened due to over harvesting, habitat loss and pollution (Ref. 58490).
Spawning sites are rocky and boulder filled areas along the outside bend of rivers (Ref. 41542).
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)
Статус Красного Списка МСОП (Ref. 130435: Version 2025-2 (Global))
Угроза для людей
Harmless
Использование человеком
рыболовство: коммерческий; аквакультура (рыбоводство): экспериментальный; объект спортивного рыболовства: да; аквариум: общественные аквариумы
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ресурсы в Интернет
Оценки, основанные на моделях
Индекс филогенетического разнообразия (ссылка
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00269 (0.00214 - 0.00339), b=3.18 (3.13 - 3.23), in cm total length, based on LWR estimates for this species (Ref.
93245).
Трофический уровень (ссылка
69278): 3.3 ±0.49 se; based on food items.
устойчивость к внешним воздействиям (ссылка
120179): очень низкий, минимальное время удвоения популяции более 14 лет (tm=16-26; tmax=152; K=0.04; Fec=50,000).
Уязвимость рыбной ловли (Ref.
59153): Very high vulnerability (86 of 100).
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