Tematica Pesci

Myoxocephalus quadricornis Linnaeus, 1758

Phylum: Chordata Haeckel, 1874

Subphylum: Vertebrata Lamarck J-B., 1801

Classe: Actinopterygii Klein, 1885

Ordine: Scorpaeniformes Greenwood et al., 1966

Famiglia: Cottidae Bonaparte, 1832

Genere: Myoxocephalus Tilesius, 1811

Descrizione

Ha una grande testa nodosa con labbra sporgenti e quattro protuberanze ossee, sebbene queste ultime non siano presenti nelle forme lacustri di acqua dolce di questo pesce. Le pinne pettorali sono grandi e arrotondate. Le forme d'acqua dolce assomigliano allo scazzone alpino e allo scazzone europeo, ma si distinguono da loro per il fatto che le pinne dorsale e anale terminano più in avanti dando una maggiore lunghezza al peduncolo caudale. La testa, il corpo e le pinne sono brunastre, screziate e barrate di colore più scuro. Il ventre del maschio è bruno-giallastro mentre quello della femmina è biancastro. In mare questo pesce raggiunge da 20 a 30 cm ma nei laghi supera raramente i 15 cm. Si nutre di invertebrati che vivono sul fondo e uova di pesce. Nidifica in inverno tra novembre e marzo e il maschio si prende cura delle uova. Scava una cavità nel substrato in cui la femmina depone una serie di uova. Quindi rimane in guardia, sventolando le uova con le pinne durante il periodo di incubazione di cento giorni.

Diffusione

È presente nell'Oceano Atlantico e Oceano Artico: costa baltica della Svezia, Finlandia, Russia e sud-occidentale alla Polonia orientale; costa occidentale della Svezia costa settentrionale della Norvegia, a est di Bianco e del Mare di Barents bacini. In Siberia a est fino circa all'estuario del fiume Anadyr. Popolazioni Landlocked diffuse in Svezia, Finlandia centrale e Carelia. Bacini fluviali artici del Nord America.

Sinonimi

= Cottus hexacornis Richardson, 1823 = Myoxocephalus hexacornis Richardson, 1823 = Oncocottus hexacornis Richardson, 1823 = Triglopsis quadricornis Linnaeus, 1758.

Bibliografia

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	Data: 01/01/1997 Emissione: Vita nelle acque fredde Stato: Åland Islands