Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
marina; sötvatten; brackvatten bottenlevande; anadrom (Ref. 138280); djupintervall 6 - 53 m (Ref. 93286), usually 6 - 34 m (Ref. 93286). Subtropical; 49°N - 28°N, 82°W - 65°W (Ref. 54259)
North America: St. John River in Canada to St. Johns River in Florida, USA.
Längd vid första mognad / Storlek / Vikt / Ålder
Könsmognad: Lm 50.0, range 45 - 55 cm
Max length : 143 cm TL hane/ej könsbestämd; (Ref. 6866); common length : 50.0 cm TL hane/ej könsbestämd; (Ref. 12193); publicerad maxvikt: 23.0 kg (Ref. 6866); rapporterad maxålder: 67 år (Ref. 6866)
Taggstrålar i ryggfenan (totalt) : 0; Mjukstrålar i ryggfenan (totalt) : 33 - 42; Taggstrålar i analfenan: 0; Mjukstrålar i analfenan: 18 - 24. Snout short, bluntly V-shaped, not upturned at tip. Barbels short (Ref. 7251). Absence of fontanelle and post dorsal shields. Single row of pre anal shields, 6-11 (Ref. 4639). Dorsal shields 7-13, lateral shields 22-34 (Ref. 4639). Blackish viscera (Ref. 37032). Head and back dark, lower surface white (Ref. 37032). Anal fin origin beneath dorsal fin origin (Ref. 86798).
Body shape (shape guide): elongated; Cross section: angular.
Inhabit river mouths, lakes, estuaries, and bays; occasionally enters the open sea. Feeds mostly at night over soft substrates; juveniles feed primarily on benthic crustaceans and insects, adults prey on benthic crustaceans, insects and mollusks (Ref. 93252). Maximum known age is 67 years for females and 30 years for males. Flesh of good quality; eggs are suitable for caviar (Ref. 3192).
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)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))
Hot mot människor
Harmless
Mänskliga användningsområden
Fiskeri: mindre kommeriell; sportfisk: ja; Akvarium: Offentliga akvarier
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Uppskattningar baserade på modeller
Önskad temperatur (Ref.
123201): 7.5 - 25.5, mean 15.6 °C (based on 138 cells).
Index för fylogenetisk mångfald (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00316 (0.00155 - 0.00645), b=3.19 (3.02 - 3.36), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.3 ±0.39 se; based on food items.
Generation time: 23.4 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
Resiliens (Ref.
120179): Mycket låg, lägsta populationsfördubblingstid mer än 14 år (K=0.04; tm=14-17; tmax=67; Fec=48,000).
Sårbarhet i fisket (Ref.
59153): Very high vulnerability (77 of 100).
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