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The largest sturgeon on record was a beluga female captured in the Volga Delta in 1827, measuring 7.2 m (23 ft 7 in) long and weighing 1,571 kg (3,463 lb). Most sturgeons are anadromous bottom-feeders, migrating upstream to spawn but spending most of their lives feeding in river deltas and estuaries.
When ready to spawn, white sturgeon choose a variety of substrates dependent on the river system, spawning on gravel or rocky substrate in moderate to fast currents, with observed depths of 3–23 m (9.8–75.5 ft), and water velocities at the bottom on a range of 0.6-2.4 m/sec. [21] When eggs are released by the female, they are negatively ...
Sturgeon are an anadromous species that live solitarily or in small groups. They migrate upriver in the spring to spawn. Sturgeons tend to inhabit the shallow waters of coastal shelves, coastal and estuarine areas on soft bottom in the sea, and can live down to a depth of 160 ft (49 m).
They prefer to spawn in temperatures between 55 and 64 °F (13 and 18 °C). [15] Lake sturgeon reproduce by swimming around each other in circles and shaking violently; the male stops circling when he has released his sperm and the female then lays her eggs. [16] Males spawn every 2 to 7 years while females spawn every 4 to 9 years.
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Males attain sexual maturity at 12–16 years of age, whereas females do so at 16–22 years. They will spawn every four to seven years. At one time, beluga sturgeons could migrate up to 1,000 km (620 mi) upriver to spawn, but dams in almost every major tributary that they utilize have impeded historic spawning routes.
The recovery in that system was recently documented with clear video footage of sturgeons congregating and spawning in the Ottertail River for the first time in 125 years. "Our voices were heard ...
Lake sturgeon congregate in the shallows of the Wolf River on April 14 near Shiocton. The fish are gathering in the area to spawn.