Blubber fish or trout....
Rainbow Trout Brown Trout Kokanee Salmon Small Mouth Bass
1. One of best ways to distinguish the sex of a trout is to examine the mouth. Female trout all have a short rounded nose or upper jaw, while male trout have a more elongated snout. If your trout has a lower jaw with a kype, it's a male for sure. Although the mouth of a female trout will grow larger as it ages and increases in size, the mouth will never grow a kype (hooked lower jaw). Upon becoming sexually mature, male trout will begin to grow a pronounced kype. At first, it will just be a tell-tale sign, but as a male trout ages, its kype will become more pronounced. It's important to point out that even for trout that aren't sexually mature, an angler can look at the mouth of a trout and see either a uniform mouth with a short rounded nose (female), or a elongated snout with a slightly longer lower jaw (male).2. Sexually mature male and female trout for both rainbows and browns have different looking anal fins. A male will have a slight convex anal fish "(", while a female trout's anal fin will be slightly concave ")". I'm not sure if cutthroat trout are in the same boat. I'll have to depend on the community who regularly catch them, to provide us their insight and confirm this.
small mouth bass
Trout
No! Stomach acids would eventually dissolve metals.
my guess is a raccoon probably i have no idea
Catfish and carp require lower levels of oxygen than trout. Since the mouth of a river typically has lower levels of oxygen and the area near the source has higher levels of oxygen, catfish and carp can thrive at the mouth and trout, which require higher levels of oxygen, thrive at the source.
lake trout , rainbow trout ,white fish
Trout.
trout
Trout are a very curious with their choice of eating. Trout are a very aggressive fish, usually eating whatever can fit in their mouth. Although this is so, trout are also very cautious about what they eat. A trout will not usually eat if it has been spooked or in a state of shock(after being stocked). A natural looking spinner or insect fly usually will catch a trout.