The Atlantic herring is a well-known fish from the salt waters of the North Atlantic, playing a crucial role in the marine ecosystems of Quebec. Although its fishing is not considered a sport in itself, it holds significant economic and ecological importance. Herring is highly sought after as bait for other sport fish such as mackerel and tuna. Its distribution in Quebec is primarily concentrated in the Gulf of St. Lawrence and its surroundings, where it gathers in immense schools, offering a fascinating spectacle for anglers and naturalists. Its capture is often synonymous with outings at sea where one enjoys the salty air and marine landscapes of Quebec.

The Atlantic herring is distinguished by its fusiform and elongated body, typically measuring between 20 and 30 cm in length at maturity, although some individuals can reach up to 40 cm. Its color is silver with a blue-green back, allowing it to blend into the marine waters when swimming in schools. The sides and belly are a bright silver, and its scales are smooth and easily detachable. The mouth is small and terminal, adapted to its planktonic diet. Its fins are rather small, with a single dorsal fin located in the middle of the back. The tail is forked, giving it great speed and agility in the water. Young herring resemble adults but are generally smaller and have slightly more pronounced patterns. During spawning, males and females show few visual differences, although females may appear slightly rounder when they are full of eggs.

In Quebec, the Atlantic herring is primarily found in the Gulf of St. Lawrence, including the north coast and Gaspésie. It is also found around the Magdalen Islands. It is a pelagic species that forms large schools, often near the coasts, especially in spring and autumn. Its abundance varies with the seasons and reproductive cycles, but it is generally well present in these regions. In contrast, it is absent from freshwater and areas further north, where temperatures and salinities do not suit its lifestyle.

The Atlantic herring prefers salty, cool, and well-oxygenated waters. It frequents coastal areas and continental shelves, often at depths ranging from the surface to about 200 meters. These fish gather in large schools that move according to the seasons and food availability. In summer, they tend to move to deeper, cooler waters, while in spring and autumn, they come closer to shore to feed and spawn. The waters of the Gulf of St. Lawrence, rich in plankton, are particularly conducive to their survival and reproduction.

The life cycle of the Atlantic herring is closely linked to the seasons and environmental conditions. Spawning generally occurs in spring and autumn when schools gather in shallow waters near the coasts. Females lay several thousand eggs that adhere to marine substrates such as algae and rocks. After hatching, the larvae drift with the plankton and quickly begin to feed on zooplankton. Growth is rapid, and juveniles reach sexual maturity in 3 to 4 years. Their longevity can reach 8 to 10 years under optimal conditions.

Spring → Spawning and laying → Summer → Growth of juveniles → Autumn → Coastal migration → Winter → Depths for feeding

The Atlantic herring is a social fish, living in large schools that can number in the thousands. These schools are very dynamic and move quickly according to currents, water temperature, and food availability. Herring are not territorial and show little sensitivity to noise or mechanical disturbances, although sudden changes in light can temporarily disperse them. Weather conditions such as wind and currents influence the depth and direction of their movements, but they generally stay sheltered in areas where plankton is abundant.

The diet of the Atlantic herring mainly consists of plankton, which it filters from the water using its gills. Larvae feed on microorganisms and zooplankton, while adults consume a greater variety of plankton, including copepods and crustacean larvae. Depending on the seasons, the availability of these resources may vary, but herring are opportunistic feeders that adapt their diet to local conditions. In summer, plankton abundance is at its peak, promoting rapid growth of young fish.

The Atlantic herring is most active in spring and autumn, during which it comes closer to shore to spawn and feed. During these seasons, its presence is easier to detect due to the movements of schools following currents and the availability of plankton. In summer, herring tend to move to deeper waters, where they find cooler temperatures and an abundance of food. Winter sees them descend even deeper, where they slow their activity while waiting for favorable conditions to return. The time of day has little influence on their behavior, but cloudy days and choppy waters may encourage them to come closer to shore.

For fishing Atlantic herring, lures in silver or blue-green colors are the most effective, as they mimic the natural reflection of the fish. In clear water and sunny weather, favor silver lures that reflect light well. In murky water or overcast conditions, a blue-green lure may stand out better in the water. Adjust the size of the lure to the size of the fish present, with small lures generally being sufficient.

To fish for Atlantic herring, a light fast-action rod of 1.8 to 2.1 meters is recommended. A light fixed spool reel, spooled with 4 to 8 lb line, allows you to detect even the slightest bites. Size 6 to 8 hooks are ideal for herring, which has a small mouth. A fluorocarbon leader can be used for its invisibility, especially in clear water.

Herring are delicate fish to handle due to their easily detachable scales. Use wet hands to avoid removing the protective mucus layer. If you wish to release it, do so quickly to minimize stress. For a photo, hold the fish carefully, without squeezing, and ensure that the gills remain submerged as much as possible.

The natural predators of Atlantic herring in Quebec include fish such as tuna, mackerel, and seals. Seabirds, such as gannets and gulls, also enjoy herring, especially when they are near the surface.

The Atlantic herring is a managed species in Quebec with catch quotas to ensure its sustainability. Natural fluctuations in its population are monitored, and regulations on fishing seasons and capture methods are in place. Catch and release is encouraged for recreational fishing, especially when fish are caught accidentally.