The yellow sturgeon is an iconic fish of the freshwater waters of Quebec, prized by anglers for its impressive size and remarkable longevity. Although it is not particularly aggressive, its strength and ability to resist make it a formidable opponent for sport fishermen. It is mainly found in the large river basins of Quebec, such as the St. Lawrence River, as well as in some lakes and rivers. Its popularity lies not only in its weight and size but also in the challenge it represents. Additionally, the yellow sturgeon is an excellent indicator of the health of aquatic ecosystems, making it a species of interest for biologists and conservation-minded fishing enthusiasts.

The yellow sturgeon has an elongated fusiform body covered with five rows of bony plates called scutes, giving it a prehistoric appearance. Its color ranges from yellowish-brown to olive gray, with a lighter belly. Its head is elongated by a pointed snout, beneath which is a protractile mouth without teeth, ideal for digging the bottom in search of food. Four sensory barbels hang in front of the mouth, allowing it to detect its prey. Its dorsal and anal fins are located near the tail, while its caudal fin is heterocercal, meaning the upper lobe is longer than the lower lobe. Young sturgeons are often lighter and have more distinct patterns than adults. During spawning, males may be slightly smaller and more slender than females, which develop a rounder belly to hold the eggs.

In Quebec, the yellow sturgeon is mainly present in large river systems such as the St. Lawrence River, the Ottawa River, as well as in some large lakes like Lake Saint-Pierre and Lake Témiscamingue. It is also encountered in some northern rivers, although less frequently. It prefers deep, calm waters with a muddy or sandy bottom, where it can feed by digging into the substrate. Its distribution is influenced by water quality, and it is often absent from waterways that are too polluted or heavily modified by human activity.

The yellow sturgeon primarily inhabits large bodies of freshwater, including slow-flowing rivers, deep lakes, and estuaries. It particularly favors soft-bottom areas, such as sand or mud beds, where it can easily find food. It is often found at depths ranging from 3 to 20 meters, although it can go deeper in large bodies of water. It prefers waters with temperatures between 14 and 20 °C, but it can tolerate a wide range of environmental conditions, including slightly brackish waters near estuaries.

The yellow sturgeon has a long and complex life cycle. Spawning occurs in the spring when water temperatures reach around 10 to 15 °C. Adults migrate to specific spawning areas, usually upstream in rivers, on rocky or gravel substrates. Females lay several thousand eggs that adhere to rocks and hatch after about a week. Young sturgeons spend their early years in protected habitats before joining adults in large bodies of water. They reach sexual maturity very late, between 14 and 25 years, and can live up to 100 years or more. Spring → Spawning and laying → Summer → Growth of young → Autumn → Preparation for winter → Winter → Slowed life under the ice.

The yellow sturgeon is generally solitary, although it may be observed in small groups, especially during spawning. Non-territorial, it often shares its habitat with other aquatic species. It is relatively insensitive to noise and surface movements, but weather conditions, such as changes in barometric pressure, can influence its feeding behavior. It is more active at dusk and dawn, when it explores the bottoms for food.

The diet of the yellow sturgeon varies with age and season. Young sturgeons primarily feed on zooplankton and small invertebrates. As they grow, they adopt a more opportunistic diet, including insect larvae, mollusks, crustaceans, and sometimes small fish. In winter, its metabolism slows down, and it becomes less active, feeding sporadically. Spring and autumn are the periods when it feeds most actively to accumulate reserves needed for spawning and winter.

In spring, the yellow sturgeon becomes more active with the warming of the waters, preparing for spawning. It is then easier to locate in migration areas towards spawning sites. In summer, it stays in deep, cool waters but can be fished early in the morning or late in the evening. Autumn is a period of high feeding activity as it accumulates reserves for winter. During winter, the yellow sturgeon slows its activity under the ice, but it is still possible to fish it on warmer days. Changes in atmospheric pressure and weather fronts can influence its behavior, making it more or less active.

For yellow sturgeon, prefer lures that mimic natural prey, such as worms or shrimp. In clear waters, use natural colors like brown or green. In murky water, brighter colors or fluorescent lures may be effective. On sunny days, muted colors work better, while on overcast days, brighter colors can attract attention.

Opt for a sturdy rod 2.4 to 3.6 meters long with heavy power and moderate action. A fixed spool or baitcasting reel capable of holding a 20 to 40 lb line is ideal. Use circle hooks sized 4/0 to 8/0, and a 50 lb fluorocarbon leader to withstand abrasion from the sturgeon's scutes.

Handle the yellow sturgeon with care, supporting it well under the belly to avoid injury. Use fine-mesh nets to lift it out of the water. If you plan to release it, do so quickly and ensure it is well-oxygenated before letting it go. For a photo, hold it horizontally and avoid squeezing too tightly.

Adult yellow sturgeons have few natural predators due to their size and tough skin. However, young sturgeons can be vulnerable to large predatory fish like pike and walleye. Piscivorous birds, such as ospreys, may also pose a threat to young sturgeons.

In Quebec, the yellow sturgeon is considered a species of concern due to its late maturation and sensitivity to environmental disturbances. Fishing is regulated, and anglers are encouraged to practice catch and release to preserve populations. It is essential to respect quotas and fishing periods to ensure the sustainability of this species.