River Eels - Anguilla
Size: Female: 50-100 cm, 0.5-2 kg, max. 3-4 kg.
Smaller male, usually less than 50 cm.
The common immature (yellow) olive eels dark olive with yellowish abdomen. When preparing for spawning migration the skin of the back becomes blackish brown, the abdomen almost white or the flanks acquire a metallic glow.