fish, stickleback, sticklebacks, threespined stickleback, three spined stickleback, three-spined stickleback, threespine stickleback, three spine stickleback, three-spine stickleback, freshwater, tiddler, tittlebat, sprick, Gasterosteus aculeatus, reproductive color, breed, mate, mating, fertilised, fertilized, fertilise, fertilize, fertilisation, fertilization, reproduction, nest, nest hole, nest tunnel, threespined sticklebacks, three spined sticklebacks, three-spined sticklebacks, threespine sticklebacks, three spine sticklebacks, three-spine sticklebacks, stickle, stickles