11005-12703 Southern freshwater crayfish, or koura (Paranephrops zealandicus 'south island southeast') scavenging on a dead Smeagol galaxias(Galaxias gollumoides) *
DSC_0269 Southern freshwater crayfish, or koura (Paranephrops zealandicus 'south island southeast') blue crayfish are not uncommon in the deeper lakes around New Zealand. Blue koura survive because the colour spectrum of light shifts as it passes down through the water, and beyond a certain depth there is no effective visual difference in colour between a blue crayfish and a brown one *
DSC_0217 Southern freshwater crayfish, or koura (Paranephrops zealandicus 'south island southeast') blue crayfish are not uncommon in the deeper lakes around New Zealand. Blue koura survive because the colour spectrum of light shifts as it passes down through the water, and beyond a certain depth there is no effective visual difference in colour between a blue crayfish and a brown one *
