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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.