The rock gunnel, or Pholis gunnellus, is a small marine fish found along the rocky shores of Quebec. It is rarely targeted by sport fishermen due to its small size and low fighting ability. However, it plays an important role in the coastal ecosystem by serving as prey for many larger predators. Its distribution is primarily along the Gulf of St. Lawrence and coastal areas where it hides in crevices and seaweeds. Although it is not well known, it is an interesting indicator of the health of marine ecosystems.

The rock gunnel is an elongated and slender fish, typically measuring between 15 and 25 cm. Its coloration ranges from brown to olive green, with lighter patterns in the form of bands or irregular spots on the sides. Its head is small with a slightly prominent terminal mouth. It has a continuous and very elongated dorsal fin that extends almost the entire length of its body. The pectoral fins are rounded and well-developed, while the caudal fin is slightly rounded. The scales are small and smooth, making its skin slightly slimy to the touch. Young fish resemble adults but are often lighter and thinner.

In Quebec, the rock gunnel is primarily found along the shores of the Gulf of St. Lawrence, including the regions of Gaspésie and Côte-Nord. It is less common in waters further south and is absent from freshwater. It is abundant in rocky areas and seagrass beds where it can hide from predators. Although its presence is stable, it can sometimes be difficult to spot due to its ability to blend in among rocks and seaweeds.

The rock gunnel prefers the salty and brackish waters of rocky shores where it can hide in crevices and seaweeds. It is often found at depths ranging from a few centimeters to about twenty meters. These fish appreciate areas where the water temperature is cool, generally between 8 and 15 °C, and where the bottom consists of rocks and seaweeds that provide natural cover. They avoid overly turbulent waters, preferring sheltered bays and inlets.

The rock gunnel spawns in winter when water temperatures are low. Females lay their eggs in crevices or under stones, where they are protected from currents and predators. The eggs hatch in spring, and young gunnels begin their rapid growth in nutrient-rich coastal waters. Sexual maturity is reached at about 1 to 2 years of age. These fish typically live up to 5 to 7 years. Spring: Hatching → Summer: Rapid growth → Fall: Preparation for spawning → Winter: Spawning.

The rock gunnel is a relatively solitary fish, although it can sometimes be found in small groups, especially when feeding. It is not particularly territorial, but it prefers to stay hidden in crevices or under seaweeds to avoid predators. Sensitive to changes in light, it is more active at dawn and dusk. Weather conditions such as wind and rain do not greatly affect its behavior, but it avoids areas where currents are too strong.

The rock gunnel has a varied diet that mainly includes small crustaceans, worms, and mollusks. Young fish primarily feed on plankton and tiny invertebrates, while adults capture larger prey. In summer, when food is abundant, they feed actively throughout the day. In winter, their feeding activity decreases, and they feed less frequently.

Spring is an active time for the rock gunnel, as young fish begin to hatch and feed abundantly. In summer, with warmer waters, they are more visible and active, especially early in the morning and late in the afternoon. Fall sees a decrease in their activity, but they continue to feed to build reserves before winter. In winter, spawning occurs, and they become more discreet. Weather conditions, such as cloudy skies or light showers, do not significantly impact their behavior, but they prefer calm days with little wind.

To catch the rock gunnel, lures are generally not necessary, but if you want to experiment, opt for small soft lures mimicking worms or crustaceans. In clear waters, choose natural colors like brown or green. In murky water, brighter colors can be used to attract attention.

To fish for the rock gunnel, a light rod of 1.8 to 2.1 meters is sufficient. Use a light reel with a line of 4 to 6 lb. Hooks should be small, size 8 to 12, to match the small mouth of the gunnel. A fluorocarbon leader may be useful for its invisibility in the water.

When handling the rock gunnel, be gentle, as its skin is fragile and easily damaged. Use wet hands to minimize damage. Release should be quick and gentle. For a photo, hold the fish near the water for immediate release afterward.

The rock gunnel is prey for many predators, including larger fish like striped bass and seabirds such as cormorants. Seals may also consume it when it is abundant near the surface.

The rock gunnel is not subject to specific conservation measures in Quebec due to its wide distribution and relative abundance. However, it is important to respect coastal habitats by avoiding pollution and human disturbances. Catch and release is recommended to maintain local populations.