Whiting

The whiting (Merlangius merlangus) is a slender member of the cod family (Gadidae), native to the northeastern Atlantic Ocean, North Sea, and Mediterranean and Black Seas. It belongs to a large order of Gadiform fishes closely related to cod and haddock, distinguished by its three dorsal fins and two anal fins typical of the family. Whiting are among the smaller Gadidae, rarely exceeding half a meter, and occupy inshore and shelf waters at moderate depths. They form an important link in coastal food webs, preying on smaller fish and invertebrates while serving as prey for larger predatory fish, seabirds, and marine mammals. Populations are distributed widely across European continental shelf waters, with regional subpopulations in the North Sea, Celtic Sea, and Mediterranean basins.

Whiting have an elongated, silvery body with a pale to yellowish-grey back and white belly, lacking the prominent barbel found on cod and haddock.

• Body: slender, tapering, slightly compressed
• Fins: three separate dorsal fins, two anal fins, no chin barbel (or vestigial)
• Key mark: small black blotch at the base of the pectoral fin
• Mouth: slightly protruding lower jaw
• Size: typically 20-40 cm

Whiting can be told apart from pouting or poor cod by their lack of a prominent barbel and the diagnostic dark pectoral-fin spot, and from silver hake by their shorter, more compact body shape.

Whiting inhabit continental shelf waters of the northeastern Atlantic, from Norway and Iceland south to the Mediterranean and Black Seas, with the North Sea and Celtic Sea holding dense populations. They favor sandy or muddy seabeds at depths from just a few meters down to around 200 m, moving into shallower coastal waters and estuary mouths as juveniles before shifting to deeper offshore grounds as adults. Whiting tolerate a range of temperatures but are most abundant in cool, temperate shelf seas. Juveniles often shelter among seagrass beds and rocky reefs for protection from predators, gradually moving to open sandy or gravel bottoms with age.

Whiting are active, schooling predators that hunt mainly at dusk and during the night, using their large eyes to locate prey in low light. Juveniles feed heavily on small crustaceans, while adults become increasingly piscivorous, taking sprat, sandeels, and young herring alongside shrimp and worms. Schools shift seasonally, moving inshore in spring and summer to spawn and retreating to deeper offshore waters in winter. Spawning occurs from January to July depending on latitude, with females releasing large numbers of small pelagic eggs that drift with currents before hatching. Whiting play a key ecological role as both predator of small fish and forage species for cod, seabirds, and seals.