10 20 40 60 cm

mittakaava > 60 cm

         
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Gösta Sundman: Suomen Kalat (Kansalliskirjasto, The National Library of Finland), Lauri Urho, Petri Savola (Uudenmaan ympäristökeskus)

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Cod

Gadus morhua

  • Other names: Atlantic cod
  • Family: Codfishes – Gadidae
  • Similar species: None in Finland
  • Size: 40–80 cm, 0.5–3 kg, large specimens weigh 6–7 kg but can attain 20–30 kg.
  • Appearance: With its large head and gaping mouth lined with small teeth, the cod can hardly be confused with any other of Finland’s sea fishes. The lower jaw has a single barbel. The dorsal fin comprises three parts and the anal fin two. Scales very small.
  • Colouring: Pale belly with sides and back showing pronounced brown mottling. Pale stripe runs along lateral line.
  • Reproduction: Spawns from early spring through to August in open water at depths of 50–150 m. The eggs float in water with a salinity of at least 0.11% but below this they sink and fail to survive, so that cod rarely reproduce in Finnish waters. Cod caught here originate from the southern Baltic.
  • Food: Benthic invertebrates, notably isopods, and small fish and fish roe.
  • Distribution and habitat: Occurrence in Finnish sea waters varies greatly. Pulses of saline sea water through the Straits of Denmark can bring large numbers of cod into the Baltic as far as the northern Gulf of Bothnia and the eastern Gulf of Finland. At other times, cod occasionally turn up off the SW coast.

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