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Insects | Flies | Terms/Glossary Basic Insect Entomology - Artificial FliesAt my first Trout Unlimited meeting they were talking about Mayflies, Blue-Winged Olives, Hendricksons, Duns, Wooly Buggers and many other things involved in catching trout. I thought they were all species of insects; Actually only one, the Hendrickson, was. A Mayfly is an order in the insect class (remember your taxonomy from biology:
Kingdom [animal] < Phylum [arthropod { Insects, Spiders, beetles, ticks, crabs, shrimps, ...}
A dun is a stage in the mayfly life cycle also a color of some fly tying materials. From the day that Alfred Ronalds published "The Fly-Fisher's Entomology" in 1836, anglers have been fascinated with aquatic insects and the flies to match them.
This page is a summary so a beginner will have some clue as to what they are talking about, for a excellent site with more complete information see Jason Neuswanger's Aquatic Insects of American Trout Streams at TroutNut.com.
Insect taxonomic classification: | ||||||||||||||||||||||
Orvis Fly Patterns | ||||||||||||||||||||||
Mayflies - Order Ephemeroptera The Mayfly is the most important group for anglers. The order Ephemeroptera, or mayflies, comprises 21 families, about 82 genera, and more than 600 species in North America. Of those, there are about 12 families, 30 genera, and a couple of hundred species potentially important to anglers. Some genus and species in Ephemeroptera: Brown Duns, Blue-Winged Olives (BWO), Hendricksons, Sulphurs, Hexagenia (Hex) and Big Drakes, Cahills, Quill Gordons, Slate Drakes, Green Drakes, Tricos, Black Quills and Blue Quills, White Flies, more. |
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There are four types of nymphs: Swimmers (Baetidae - BWO), crawlers (Ephemerellidae - Hendricksons, Sulphurs, ..), clingers (Heptageniidae - March Browns, Cahills, Quill Gordons, ..) and burrowers (Ephemeridae - Hexes, Big-Drakes). | ||||||||||||||||||||||
1. A dun is the first stage in the adult mayfly's life cycle; usually of short duration (1 to 24 hours); this is the stage most often imitated by the | ||||||||||||||||||||||
2. Spinner refers to the stage when the female has dropped back onto the water to die after laying her eggs. A mayfly spinner (imago) has wings that are hyaline (shiny and transparent). | ||||||||||||||||||||||
The Duns will sit on the surface of the water letting their wings dry out in an upright position after emerging. The spinners usually drop their eggs from high then lie on the water usually with their wings prone (or "spent"), and lie motionless on the surface until they are eaten or drowned. See article at orvis.
Hatches: Duns most often emerge during an hour or two each day for a couple weeks sometime in the spring or summer, though there's great variation between species; Slate drakes have multiple generations with hatches thru Sept.. See Hatch Times below. | ||||||||||||||||||||||
Caddisflies - Order Trichoptera Families, Genus and species in Trichoptera: Early Smoky Wing Sedges, Apple Caddis and Grannoms, Little Black Caddisfly, Little Brown-Green Sedges, Hydropsychidae, Little Brown-Green Sedges, Leptoceridae, Little Black Sedges, Northern Caddisflies, Tiny Black Gold Speckled-Winged Caddis, Green Sedges, Autumn Mottled Sedges, more. |
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Hatches: In the early or mid summer, the larvae reach maturity and move from the faster currents to the slower flows that are generally found along the margins of the stream to begin pupation which takes about 2 months. It crawls into a protected niche and constructs a cocoon to start pupation. During this period the insect is unavailable as trout food except during catastrophic drifts caused by floods etc. Most pupae emerge from waters that are too shallow or too exposed for trout.
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Stoneflies - Order Plecoptera Families and genus in Plecoptera: Little Yellows and Little Greens, Little (Tiny) Black, Roachflies, Golden Stones, Medium Browns and Yellows, Yellow Sally, Salmonflies, Willowflies |
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Hatches:
They emerge by crawling out of the water onto rocks, sticks, or other shoreline objects.
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Midge Order - Diptera (True Flies) Family Chironomidae (Midges) Midges are small, down to hook size 28. |
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Other trout food: Insects: Alderflies, Beetles, Damselflies, Dobsonflies, Dragonflies, Water Boatmen, Grashoppers Crustaceans: Crayfish, Scuds, Sowbugs Fish and amphibians: Minnows, Salamanders Terrestrials: Insects which live on land and are fed on by trout only when they incidentally fall into the water. Important in late summer. E.g. Order Hymenoptera (Ants, Bees, and Wasps) I caught a rainbow with an ant at Lola Montez in July. More... | ||||||||||||||||||||||
Life Cycles (Stages): Insects go thru a metamorphosis transforming into different forms. Stages vary by family. Some examples:
Metamorphosis - Metamorphosis is the change that occurs during the organism's development (life cycle) from egg to adult. Most aquatic insects can be divided into two groups: ones that develop through complete metamorphosis, and ones that develop through incomplete metamorphosis.
Examples: Caddisflies, Midge, Mosquitoes, Aquatic Gnats and Flies
Incomplete metamorphosis has three main stages of development (except for the mayfly that has two winged growing stages). These immature insects are called nymphs and they undergo a series of molts until the last decisive molt transforms the organism into an adult or imago in mayflies. There is no intermediate pupae stage where transformation occurs. The nymphs resemble the adults closely except for wing development.
Flies: Flies are named by "Fly patterns" designed to imitate insects (in various forms from larva to adult), baitfish, and other fish food. They can range in size from imitation fish eggs to mice and frogs. There are usually a variety of styles and colors within a given pattern. They are made with various materials such as bird feathers, animal fur and hair, wool, yarn, foam, beeswax, mylar, ... and are usually held together with sewing thread and glue.
Ernest Schwiebert is credited with popularizing the term "matching the hatch" in 1955. When there is no hatch some stick to nymphs because that is what trout are feeding on, others say multi-purpose dry flies will attract fish. There are books written on this and it makes for good discussion.
Gary LaFontaine said that the three main methods of deciding on a particular fly are empiricism (trial and error tempered by previous experience), generalism (actually a denial that fly choice is very important and that fish will take any fly as long as I present it properly.), and naturalism (bug watching).
Hatch Times for mid-Atlantic streams:
Some species have multiple generations; e.g. Slate drakes have hatches from April to Sept. Source: Mid Atlantic Trout Streams and their Hatches by Charles R. Meck See also: Hatch Charts at Cold Water Fly Fishing for Trout by NCFishandGame.com a volunteer organization. Selecting a fly is not as simple as matching a pattern to an insect that lands on your arm as in the movie "A River Runs Thru It". Some flying insects only land on the water to die during a short period of time after laying their eggs from the air.
Patterns generally fall into 3 classes: Dry flies (usually imitating adult insects which stay on the top of the water) and 2 classes of wet flies (that sink below the surface of the water), Nymphs/Emergers and Streamers/Poppers/Terrestrials.
Most popular flies: |
Woolly Bugger (5) (streamer): Tied to imitate the Dobsonfly larva, leeches, baitfish (minnows, night crawlers, ...), tadpoles, damselfly larvae, dragonfly larvae, crayfish and others. A generalist pattern that's always worth a try and a must have for any fly box, dry fly purists excepted! In this 'original' dressing the pattern can be used for trout, largemouth and smallmouth bass, panfish, chub, and carp, to name a few. In suitable sizes and with more applicable colors you can expect to get into steelhead, salmon, stripers and more.
Pheasant Tail (4) (Nymph)
Hare's Ear (4) (Nymph) |
Elk-Hair Caddis (4) (Dry fly)
Adams (4) (Dry fly)
- Partridge Soft Hackles
- Midges and Chironomids |
Griffith's Gnat (3) (Dry Fly, Emerger)
Clouser Minnow (3) (streamer)
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Other popular flies: Light Cahill, Royal Coachman
Purchase Flies: ReelFlies.ca, FishingConcepts.com, DiscountFlies Online Fly Shop, Discount Flies at OnFlyFishing.com, cabelas.com, llbean.com, Orvis Continental Flies Trout Dry Fly Assortment Terms:
Books: Trout Flies: The Tier's Reference by Dave Hughes Haandbook of Hatches by Dave Hughes Essential Trout Flies, by Dave Hughes The Benchside Introduction to Fly Tying by Ted Leeson and Jim Schollmeyer
Links:
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