The dwarf lumpfish is a little-known fish among sport fishermen in Quebec, mainly due to its small size and low fighting ability. This marine and brackish water fish is primarily found in the cold waters of the northern St. Lawrence and estuaries. Although it is not sought after for sport fishing, the dwarf lumpfish plays an important ecological role as prey for larger species. Due to its tolerance for murky and cold waters, it is often observed in shallow coastal waters, clinging to rocky substrates with its characteristic adhesive disc.

The dwarf lumpfish is a small, stout, and globular fish, typically measuring between 5 and 10 cm in length. Its color ranges from brown to greenish, often marbled with darker spots that provide excellent camouflage among rocks and algae. Its head is broad with a small, downward-facing mouth, adapted for its benthic diet. The fins are short and rounded, and it has a distinctive ventral adhesive disc that allows it to securely attach to substrates. The scales are reduced, and the skin is thick and rough. Males and females are similar, although males may be slightly more colorful during the breeding season.

The dwarf lumpfish is found in the cold waters of the St. Lawrence estuary and in certain coastal areas of the Gulf of St. Lawrence. It is mainly located in rocky areas and reefs, where it can attach to substrates. It is less abundant in the warmer waters of southern Quebec. Its distribution is generally limited to saline and brackish waters, as it does not tolerate freshwater well.

The dwarf lumpfish prefers shallow waters, typically between 1 and 10 meters deep, where it can cling to rocks, algae, and other solid structures with its adhesive disc. It is often found in areas with moderate currents, where it can feed on small benthic invertebrates. It prefers cold temperatures typical of the northern Gulf of St. Lawrence waters and tolerates turbid waters well due to its ability to securely attach to substrates.

The reproduction of the dwarf lumpfish occurs in spring when water temperatures begin to rise slightly. Females lay their eggs on rocky substrates or in crevices, where males fertilize them. The eggs are often guarded by males until they hatch. Young lumpfish are born with a functional adhesive disc, allowing them to attach and protect themselves from predators. Growth is relatively rapid, and young reach maturity in one to two years. The dwarf lumpfish has a relatively short lifespan of three to five years.

Spring → Spawning and egg laying → Summer → Rapid growth of young → Fall → Sexual maturity → Winter → Slowed life, survival in cold waters.

The dwarf lumpfish is generally a solitary fish, although it can sometimes be found in small groups in food-rich areas. It is not territorial and moves little, preferring to remain attached to rocks or algae. It is not very sensitive to changes in pressure and light but avoids overly turbulent waters. When disturbed, it firmly attaches to the substrate to avoid being swept away by currents.

The diet of the dwarf lumpfish consists mainly of small benthic invertebrates, such as amphipods, copepods, and small crustaceans. Young fish feed on zooplankton and small organisms, while adults prefer larger prey found on the seabed. Their diet varies little with the seasons, although it may be influenced by the availability of prey in their immediate environment.

The dwarf lumpfish can be observed year-round in the cold waters of the Gulf of St. Lawrence. In spring, it becomes active for reproduction and egg laying. In summer, it takes advantage of slightly warmer temperatures to feed abundantly and grow. In fall, it begins to reduce its activity, preparing for the winter months when it remains attached to substrates to conserve energy. The best times to observe it are generally early in the morning or late in the afternoon when benthic invertebrate activity is at its peak. The dwarf lumpfish is little affected by weather changes but avoids very rough sea conditions.

The dwarf lumpfish is not targeted by traditional lures due to its small size and behavior. However, if studied for scientific or observational purposes, use natural baits like small crustaceans or worms to attempt to attract it to observation areas. Color is not of great importance for this species, but baits should be placed near the bottom, where it feeds.

For observing the dwarf lumpfish, using light equipment is recommended. An ultra-light rod with a fast action and a small reel is sufficient to handle natural baits. Use a line of 2 to 4 lb to avoid harming the fish. Hooks should be small and discreet, and it is advisable to use a fluorocarbon leader for its stealth.

Handling the dwarf lumpfish should be done carefully to avoid stressing the fish. Use wet hands or wet gloves to minimize damage to its sensitive skin. If you need to handle it for scientific reasons, do so quickly and return it to the water immediately. For photos, keep the fish low above the water to prevent accidental drops.

The aquatic predators of the dwarf lumpfish include larger fish such as cod and eelpouts. Diving birds, like cormorants, may also attack it when it is in shallow areas. Its ability to attach to substrates helps it avoid some predators.

The dwarf lumpfish is not considered threatened in Quebec, but it is an indicator of the health of coastal marine ecosystems. Managing its populations involves protecting its natural habitat and monitoring human activities that could disrupt spawning areas. There are no specific regulations for its fishing as it is not a target species.