St. Vrain Angler

          Terms & Definitions

                   Fish

Fish live in the water. Fly anglers like to fool them with flies, catch them and usually release them after admiring and reviving them.

Fish are cold blooded, which is one of the reason they are fish. Their body temperatures are monitored by their environs. When and where it is cold, the fish are cold and don't eat as much food as when and where it is hot. Too cold is death to some fish, while too hot is death to others.

Most fish are found in areas in which they will thrive. Before going fishing we should know basic water temperatures and conditions so we know how actively the fish may be feeding.

Even though fish are cold blooded, some fish types are referred to as "warm water fish" and others are referred to as "cold water fish". In general, trout and other salmonids are referred to as being "cold water fish" even though certain warm and cold water fish in the same areas.

Here are pictures of fish types and basic areas where they are found. As time goes on we'll add information as required by readers. Thanks for reading! Enjoy.

Fish ID

Note: This information is not scientific and is not designed to be used as such. It is for fun! The information dispensed here is what I have in my head concerning fish that I've caught and nothing more. I know enough to help you identify and understand fish basics. If you want more, talk to an ichthyologist.

Trout Warm Water Salmon
Saltwater    

Trout: are found primarily in cold water. There are exceptions; nature has a way of doing that. In North America there are four basic trout types: Cutthroat, Rainbow, Brook and Brown.

Cutthroat Trout are indigenous to the Rocky Mountains. All along the spine of the Rockies Cutthroat Trout thrive - or used to. In many area specific strains are extinct. Yellowstone Cutthroat, Snake River Cutthroat, Colorado River Cutthroat, Rio Grande Cutthroat, Greenback Cutthroat and many others are still with us and thrive in many areas. Cutthroat trout are an indicator species, disappearing the quickest when water conditions - high temperatures, low oxygen content or pollution - change for the worse. So, Cutthroat trout are usually found in pristine areas of the Rocky Mountain West.

Cutthroat Trout can be most sizes, from very small to very large depending on their environs and how long they live. The fish have few to no spots near the back of the head, but spots become more abundant and very close together toward the tail. There is an orange or red slash along the lower edge of their jaw, giving them their name. At spawning time, in spring, Cutts turn fire red all along their sides.

Rainbow Trout are indigenous to the Pacific Northwest, from the coast of California all the way through Alaska and along the Russian border of the Pacific. As with Cutthroat trout there are various strains of Rainbow Trout. A Steelhead Trout is basically an andronomous rainbow that goes to sea, then returns to the stream in which it was spawned to continue the family cycle of life. They spawn in spring.

Rainbow Trout have been stocked all over the world. The fish are apparently easy to rear in captivity and are turned loose as catch and keep stockers. Some fish will survive and repopulate a stream, becoming "wild" even though they live in an area where they were not indigenous. Well, look at us!

Rainbow Trout are hearty fish. They are often brightly colored with a long red slash along their sides and a red gill plate. Their spots are often small and close together, including the spots on their dorsal and tail fins. Rainbows may be more "silver" than most other trout types.

Brown Trout were brought from Ireland, Iceland, Britain and Germany and are found around the world. They were introduced in the US in about 1893 and have done very well, running out wild populations of every other type of trout in the process. These sturdy fish can withstand the widest range of conditions, including warm water and higher levels of pollution and lower levels of oxygen. They are lovely, too.

Brown trout are found at many elevations and populate lakes and streams. They spawn in the fall.

Brown trout are often a buttery color with brown and dark olive hues. their spots are large and may be black but mixed with bright red or orange. The spots are inside a lighter surrounding circle. It is thought that Brown Trout are "smarter" than other trout types. Angler often agree that browns are aggressive feeders and grow large due to a long life. I guess you'll have to hook a few to make up your own mind.

Brook Trout are actually Artic Char. Interesting, huh? They are in the same group as Bull Trout, Lake Trout, Char, Dolly Varden and so on. Still, we refer to them as trout. When they are large, we refer to them as Mr. Brook Trout, Sir! Brook Trout are from the Eastern Seaboard, from way up in Canada down to North Carolina and Georgia. Again, there are multiple strains of fish.

In the west, Brook Trout often reproduce so successfully that they stunt because there are too many mouths to feed for the food that's available. Brook Trout spawn in fall, with the brown trout.

Brook Trout have an olive back with worm-shaped figures toward the top of the fish. Blue spots are inside other spots. At spawning time the fish get very colorful, as above, with orange-red fins that are tipped with white and black markings. The inside of a Brook Trout's mouth is black.

This is a large Cutthroat Trout. This fish was caught on the Rio Grande River, but is not a Rio Grande Cutthroat, which is an endangered species, I think. Note the bright orange "gash" near the fish's jaw, which identifies it as a Cutt.
This is a Greenback Cutthroat, for all we know. It was caught in Rocky Mountain National Park. Note the red gill plate and the spots which are widely separated near the head, but get closer together and more abundant near the tail. That's a sign of a Cutt.
Cuttbow, which is a hybrid between a Cutthroat and a Rainbow. Note the orange gash on the jaw, but the small, close spots and silver coloration of the fish.
A colorful rainbow trout. Note the band of red along the lateral line and the small, close-spaced spots all along the fish's side. The bottom of the fish is bright, but hidden when the fish lies on the bottom of a stream, looking up to refuse my fly.
Red gill plate; close spots; bright bottom. Rainbow Trout! This one liked the caddis it took. Little did it know; little did it know.
Butter colored side, large even-spaced spots = Brown Trout! This one is being drug in by a dry fly, and was later released. It was not a happy fish, but most likely forgot.
This particular Brown Trout does not have as many red spots as do many others. Still, it has a buttery bottom, an olive top and large spots that are evenly spaced throughout the length of its body. Lovely, eh?
Well, at least the Brown Trout is handsome. This is a classic local fish caught on the Big Thompson River between Loveland and Estes Park. Note the colors and shape; a perfect trout specimen. I love trout; they don't fool around.
A lovely little Brook Trout. Note the shape and colors - white fins tippet in black, and orange belly which are common to Brook Trout.
This is a washed out Brook Trout, caught earlier in the season and well before spawning time. Still, the worm shapes and olive back are there, as are the white tipped fins.
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

This page will continue to be under construction and additions will be made as questions are sent, then answered. Please submit your questions by filling out the form found here: Terms & Definitions. See what's there, and ask any question you might have. I'll do my best to answer them and all of us will enjoy the process!

Thanks!

Go fly fishing, soon.

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