Eleutheronema tetradactylum és una espècie de peix pertanyent a la família dels polinèmids[1]
present des del golf Pèrsic fins a Papua Nova Guinea[2]
i el nord d'Austràlia.[3][4][5] És reemplaçat per Eleutheronema rhadinum a l'Àsia Oriental (el Japó, la Xina i el Vietnam).[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]
És un peix d'aigua dolça (entra als rius durant l'hivern),[36][37]
salabrosa i marina; pelàgic-nerític; amfídrom[38] i de clima tropical (32°N-26°S, 47°E-154°E),[39] el qual viu entre 0-23 m de fondària[40] sobre fons fangosos i costaners. Els joves viuen als estuaris.[6]
Pot arribar a fer 200 cm de llargària (normalment, en fa 50) i 145 kg de pes. Té 9 espines i 13-15 radis tous a l'aleta dorsal i 3 espines i 14-16 radis tous a l'anal. Té 4 filaments pectorals. Té les membranes de les aletes de color groc.[6][41][42][43]
És hermafrodita.[6][44]
Les larves (entre 7 i 30 mm) es nodreixen sobretot de copèpodes i de Mysida i, també, de larves de gambes. Els joves (entre 31 i 60 mm) mengen gambes i Mysida.[45]
Els exemplars adults s'alimenten de gambes, peixos (Mugilidae, Engraulidae i Sciaenidae) i, de tant en tant, poliquets.[6][46][47]
A Austràlia és depredat per la barramunda catàdroma (Lates calcarifer), Centropomidae, d'altres polinèmids, el cocodril marí (Crocodylus porosus), taurons i rajades.[48]
És inofensiu per als humans i es comercialitza fresc, congelat, assecat o en salaó.[6]
Dades ràpides Taxonomia, Nomenclatura ...
Tanca
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