Brook stickleback
<a href="https://en.wikipedia.org/wiki/User:Terrapin83" class="extiw" title="en:User:Terrapin83">Terrapin83</a>
CC BY 2.5
originally uploaded as <a href="https://en.wikipedia.org/wiki/File:Brook_stickleback.JPG" class="extiw" title="en:File:Brook stickleback.JPG">en:File:Brook stickleback.JPG</a>