here is one i like but i can't figure out how to download it or acquire it.

https://www.google.com/search?q=public+domain+photo+red+salmon&espv=2&biw=1304&bih=683&tbm=isch&tbo=u&source=univ&sa=X&ei=jbZBVbOnGoS7ogSVuYHIAw&ved=0CCgQ7Ak&dpr=1#imgrc=3kBA2TiPvVgaTM%253A%3BCnd6qhUitVDRrM%3Bhttp%253A%252F%252Fwww.nps.gov%252Fcommon%252Fuploads%252Fphotogallery%252Fakr%252Fpark%252Fkatm%252F859CA852-1DD8-B71C-071CBD3C103E79FA%252F859CA852-1DD8-B71C-071CBD3C103E79FA-large.jpg%3Bhttp%253A%252F%252Fwww.nps.gov%252Fmedia%252Fphoto%252Fgallery.htm%253Fid%253D859A44FD-1DD8-B71C-078752A578C05791%3B800%3B600

click