1 The bigger the better.  2 Good things come in small packages..  3 What's good for the goose is good for the gander..  4 One man's meat is another man's poison..  5 Birds of a feather flock together..  6 Opposites attract..
Fish. The artic grayling, a favorite of anglers, is one of the most abundant fish species found near the North Pole. Arctic char, lake trout, rainbow trout and salmon along with northern pike, whitefish, burbot and sheefish are also commonly found in the lakes around the arctic circle.
Some species originating from the Caspian Sea have also been introduced into the Baltic Sea. For example species of goby fish as well as some water fleas (Cladocera) from the genera Cercopag. Other species such as the seahorse (Mysidae), get transported in fresh water tanks and found their way to the Baltic Sea.