The Atlantic Four-line is an obscure fish found in the brackish and salt waters of Quebec. Although it is not a prime target for sport fishing due to its small size and elusive nature, it remains an interesting component of marine ecosystems. This fish is mainly found in the shallow coastal waters of the Saint Lawrence. Its presence is mainly noted by biologists and marine biodiversity enthusiasts rather than by sport fishermen, who prefer more combative species.

The Atlantic Four-line has an elongated and slim body, typical of members of the Stichaeidae family. It is easily recognizable by its four dark longitudinal lines that run from its snout to its tail. Its color generally ranges from olive brown to dark brown, allowing for good camouflage among algae and rocky bottoms. The mouth is small and slightly inferior, equipped with fine teeth suited to its diet. Its fins are relatively small and well adapted to its coastal habitat. The caudal fin is rounded, which aids in quick movements in tight spaces. Young fish are often lighter and may have spotted patterns that fade with age. There is no marked sexual dimorphism, making it difficult to distinguish between males and females, even during the spawning period.

The Atlantic Four-line is primarily found in the estuary and Gulf of Saint Lawrence, as well as in the coastal waters of Gaspésie and Côte-Nord. It is common in bays and areas where the waters are mixed and rich in nutrients. It is also found in the brackish waters of estuaries, making it a species well adapted to salinity variations. In contrast, it is absent from freshwater and areas too far from the coast.

This fish prefers shallow coastal waters where it can easily hide among algae and rocks. It is often found at depths of up to 20 meters, although it can go deeper if conditions are favorable. Cold waters, between 4 and 10 °C, are ideal for it. The Atlantic Four-line is often associated with areas rich in aquatic vegetation where it can feed and protect itself from predators. When fishing, it is advisable to look in rocky areas and eelgrass beds.

The spawning of the Atlantic Four-line occurs mainly in spring when temperatures begin to warm. Females lay their adhesive eggs on rocky substrates or among algae, where they are protected until hatching. The larvae are planktonic and drift with the currents until they are large enough to reach the bottom. Growth is relatively rapid, with maturity reached in 1 to 2 years. Longevity is short, generally 3 to 5 years. Spring → Spawning → Summer → Young growth → Autumn → Winter preparation → Winter → Slowed life

The Atlantic Four-line is a rather solitary fish, although it may be observed in small groups when food is abundant. It is not particularly territorial but often chooses areas where it can hide effectively. This fish is generally more active during twilight hours when light is low. It reacts little to sound disturbances, but changes in atmospheric pressure can affect its behavior, especially during storms.

The diet of the Atlantic Four-line mainly consists of small invertebrates, such as crustaceans, worms, and mollusks. Young fish feed on zooplankton and small crustaceans, while adults target slightly larger prey, often captured by rummaging through the substrate. In winter, its feeding activity decreases, but it continues to feed when conditions are favorable.

The Atlantic Four-line is active year-round, but its availability for fishing may vary. In spring, it moves closer to the shores for spawning, making it more accessible. In summer, it remains in coastal areas but may descend deeper if temperatures rise too much. Autumn is a good time to locate it in estuaries where it finds plenty of food. In winter, it becomes harder to spot as it hides in deep, rocky areas to protect itself from the cold. The best times to fish for it are early in the morning and late in the afternoon, especially on overcast or slightly rainy days.

For the Atlantic Four-line, choose lures that imitate small crustaceans or worms, with natural colors like brown, green, or gray. In clear waters, prefer discreet lures, while in murkier waters, slightly brighter colors can help attract attention. Phosphorescent lures can also be effective in low light.

To fish for the Atlantic Four-line, a light rod of 6 to 7 feet with a moderate action is ideal. A light reel capable of handling a 4 to 8 lb line is sufficient. Use small hooks, between #8 and #12, to match the fish's mouth. A fluorocarbon leader can be useful for its discretion in water.

Handle the Atlantic Four-line carefully, using wet hands to avoid damaging its fine protective mucus layer. For a successful release, minimize the time out of the water and ensure the fish is well oxygenated before releasing it. A quick photo can be taken by supporting the fish under its belly.

The main predators of the Atlantic Four-line in Quebec include larger fish such as striped bass and cod. Seabirds, such as the herring gull, may also hunt it when it ventures near the surface.

The Atlantic Four-line is not considered an endangered species in Quebec. However, it is important to respect local fishing regulations and practice catch-and-release when possible. Its management relies on the preservation of its natural habitat, particularly coastal areas and estuaries.