Fisken

Fisken is the definite singular form of the noun for "fish" in Norwegian and Danish. It is used to refer to a fish in the sense of a living animal or to a specific fish previously mentioned. The term is common in everyday language, literature, and media where a definite article is required.

In biological terms, fishes are aquatic vertebrates that typically breathe with gills, move with fins, and are covered with scales. They are cold-blooded and inhabit a wide range of environments, from freshwater rivers and lakes to the open ocean and coral reefs. Fishes are traditionally classified into three major groups: jawless fish (Agnatha), cartilaginous fish (Chondrichthyes, including sharks and rays), and bony fish (Osteichthyes). Within the bony fishes, most species belong to the ray-finned fishes (Actinopterygii), with a smaller group of lobe-finned fishes (Sarcopterygii) that gave rise to amphibians.

Ecology and human use: Fishes play a central role in aquatic ecosystems as predators, prey, and competitors. They are a primary source of animal protein for many populations and support commercial and recreational fisheries. Aquaculture has grown to meet demand, especially for species like carp, tilapia, and salmon.

Conservation: Many fish populations face pressures from overfishing, bycatch, habitat degradation, and climate-driven changes in water temperature and chemistry. Efforts focus on sustainable fisheries management, habitat protection, and reducing pollution.