Sterlet (Acipenser ruthenus) is the smallest native sturgeon species, instantly recognizable by its elongated, narrow pointed snout, long fringed barbels, and prominent rows of white-edged bony scutes along its body. Highly prized by anglers where legal, large specimens can reach weights of up to 16 kg.
Behavior and Feeding Habits
- Diet & Feeding Style: Feeds mainly on benthic insect larvae (especially caddisflies and midges), worms, small crustaceans, and mollusks. It cruises close to the riverbed, using its highly sensitive inferior barbels to locate hidden prey in the substrate before extending its protrusible mouth.
- Habitat: Inhabits deep sections and channels of large rivers with sandy, pebbly, or gravel substrates and moderate to strong currents. It migrates upstream in spring to reach its spawning grounds.
- Activity & Season: Most active in water temperatures between 10–20 °C. Feeds consistently throughout the warm season, with feeding peaks occurring in late spring (post-spawning) and autumn as it builds reserves for winter. It remains deep in river depressions during low temperatures.
Fishing Techniques and Catch & Release Strategy
- Effective Baits: Responds best to natural bottom baits, particularly large bunches of red worms, nightcrawlers, maggots, and insect larvae.
- Primary Method: Leger / Ledgering (bottom fishing with a heavy lead weight or feeder) is the primary method. The bait must be held firmly static directly on the riverbed in the flow.
- Conservation & Handling: Sterlet is a protected species across most of its natural range, making catch-and-release mandatory in many regions. Always check local fishing regulations prior to targeting or keeping this species. Where fishing is permitted, focus on deep channel drop-offs. Always handle caught fish with wet hands, avoid touching the gills or soft underbelly, and release them promptly to ensure survival.
