This primitive looking fish lives at the bottom of freshwater lakes and rivers in the St. Lawrence and Mississippi River Basins and the Great Lakes and Hudson Bay drainages. Lake sturgeon are omnivorous and have been described as “eating virtually anything”, including leeches, snails, clams, invertebrates, small fish and algae.
  • Size

    3 to 9 feet
  • Diet

    Leeches, snails, clams, other invertebrates, small fish, algae
  • Range

    North America
  • Habitat

    Bottom of lakes and large rivers

Physical Characteristics

  • Lake sturgeon can reach lengths of about 9 feet (274 cm) and weights of 276 lbs. (125 kg). More commonly, a mature adult averages between 3 to 5 feet (0.9 -1.5 m) and 10 to 80 lbs. (4.5 – 36 kg).
  • Primitive in appearance, the lake sturgeon has a torpedo-shaped body that is covered with five rows of bony plates: one on top and two rows along each side.
  • Lake sturgeon is gray in color dorsally and white ventrally.
  • There are four distinctive barbels near its mouth, which is on the underside of the head.

Animal Fact

It is estimated that lake sturgeon can live to, and beyond, 100 years of age!

Diet / Feeding

  • Diet consists of fishes, crustaceans, birds, and small mammals as well as reptiles. Turtles and blue crabs are common prey.
  • A bottom feeder that searches for food using its barbels as it moves closely over the substrate.

Range / Habitat

  • Lake sturgeon is a North American fresh water fish occurring in the St. Lawrence-Great Lakes, Hudson Bay, and Mississippi River basins.
  • The species is found at the bottom of lakes and large rivers (usually from about 16 to 30 feet [5 – 9 m] in depth) over mud, sand and gravel. Occasionally enters brackish water.

Reproduction & Growth

  • Spawns over rocky and boulder-filled areas along the outside bend of rivers and around islands. Spawning occurs from April through June. The female produces 100,000 to 800,000 eggs.
  • Lake sturgeon eggs hatch in 5 to 8 days and young reach 7.5 inches (19 cm) by the end of their first growing season.
  • Female does not reach sexual maturity for 14 to 23 years. Male matures in 8 to 19 years.

Additional Information

  • The lake sturgeon is estimated to live to 100 years. A 154 year old, 208 lbs. (94 kg) individual was caught in Lake of the Woods, Canada in 1953.

Sources

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