Attached Link: http://www.troutlet.com/species/index.htm

you probably won't find most trout species near plants... they prefer open clear water. If you do another google search on 'rainbow trout habitat' you'll get a ton of hits with much the same info. (I included one link that seemed to have the most general information. As to determining sex I found this in a Q&A section of a fishing magazine... "The methods to distinguish between male and female trout are difficult to determine to the untrained eye. Again, the older the trout is and the closer to spawning season, the easier it is to determine between the sexes. In general, mature male trout will develop a kype (or a hooked snout on their lower jaw) male trout also tend to be more laterally compressed than female trout and during the spawning period may be brighter in coloration. Conversely, female trout tend to have a more rounded snout and body conformation. Of course the positive way to determine this would be as you did, to sacrifice the fish and examine for the presence of eggs or sperm."