Description and characteristics
The northern pike (Esox lucius) is a large predator with an elongated, fusiform body covered with small scales. It has a long, broad, duck-bill snout and sharp teeth. Colouring is olive-green with yellowish or white spots on the flanks, camouflaging it in vegetation.
Habitat and distribution
It prefers calm waters with abundant vegetation — lakes, ponds, canals and branches of the Danube Delta. It spends its time hidden in vegetation, ambushing prey that passes close by.
Diet and behaviour
It is an ambush predator, feeding on fish, frogs and occasionally birds or small rodents. It attacks rapidly from cover, being one of the most efficient freshwater predators.
Reproduction
Spawning occurs in spring at 4–10°C, with females laying numerous eggs on flooded vegetation. The fry grow quickly and first feed on zooplankton.
Economic and ecological importance
The pike has great sport and semi-commercial value, being one of the most sought-after species by anglers. Ecologically, it controls smaller fish populations.
Threats and conservation
It is affected by loss of spawning areas and overfishing. Protection of vegetation and flooded areas is important.
Fishing and legal minimum size
The pike is caught with a rod, artificial or natural baits. In the table of minimum legal sizes, the northern pike (Esox lucius) has a minimum legal size of 40 cm.
Conclusion
The northern pike is an emblematic predator of the vegetated waters of the Danube Delta, important for fishing and ecological balance.