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Rainbow Trout (Salmo gairdneri) hatching egg. North America, introduced elsewhere Female Pike Cichlid (Crenicichla lepidota) attacking with open mouth. Amazon to N. Argentina Eggs of Brown Trout (Salmo trutta) newly-hatched alevins (fry) among eggs about to hatch. Red Piranha (Serrasalmus nattereri). Amazon Basin, Orinoco, Parana Basin Elvers of Common or European Eel (Anguilla anguilla) migrating up a stream. Brown Trout (Salmo trutta) fingerling, leaping at a damselfly. Europe Miller's Thumb (Cottus gobio) with it's eggs. Europe Rainbow Trout (Salmo gairdneri) 'Siamese twins' joined at the tail, just after hatching. North America introduced elsewhere Three-spined Stickleback (Gasterosteus aculeatus) eggs with developing embryos. Rainbow Trout (Salmo gairdneri) egg development series of 8 stages. Start bottom left and move anti clockwise. Brown Trout (Salmo trutta) fingerling yawning. Europe, introduced elsewhere Brown Trout (Salmo trutta) fingerling attempting to catch a hoverfly. Europe, introduced elsewhere Brown Trout (Salmo trutta) fingerling taking a mayfly. Europe, introduced elsewhere Three-spined Stickleback (Gasterosteus aculeatus) males in territorial dispute. Three-spined Stickleback (Gasterosteus aculeatus) males in territorial dispute. Three-spined Stickleback (Gasterosteus aculeatus) males in territorial dispute.