Lower Yuba River Hatch Chart - Updated on February 22nd, 2013
For most of us fly fishers that have attempted to figure out the Lower Yuba, it's seasons, it's bugs, and how to catch the residence rainbows and winter and summer steelhead, I have put together the information that I have gained by many years of fishing the Lower Yuba, and about six months of research to create this Lower Yuba River Hatch Chart.This research has provided the information included in the Hatch Chart, which includes, recommended "Patterns" to match the bugs found on the river, entomological "Attributes" of the bugs, the "Habitats" that you will find the bugs, and simple "Presentation" techniques to fool them.
The Lower Yuba River Hatch Chart has been updated on 02/22/13 and many of the fly patterns listed can be found at the Reel Anglers Fly Shop in Grass Valley, CA. Call Tom Page at the shop and he can hook you up.
Hatch Volume Key: None Minor Major Peak
Clay's "Go To" patterns.
Includes pattern recipe.
Caddis
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Mothers Day Caddis or Spring Caddis or Grannoms (Family: Brachycentrus) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Attributes | |||||||||||||
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Characteristic Size Larva 12-17mm, Pupa 6-12mm, Adult 6-12mm Nymph Color Green body w/tan shroud Dun Wing Color brown or black wing Dun Body Color green or dark brown body |
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| Habitat | |||||||||||||
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Nymphs Grannoms build square-shaped cases and live in riffly water or runs with moderate to fast currents. Here in Northern California the hatch typically takes place in about April. They prefer shallower riffles and runs. The larvae, though cased, often become available to trout due to their common occurrence in stream drift and an unusual rappelling behavior. |
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| Presentation | |||||||||||||
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Nymphs Use a weighted cased larva pattern on a white colored leader to imitate the rapelling behavior. Fish close to the bottom, using shot, weighted flies and indicator with an upstream presentation. Best places to fish larval patterns will be below shallow riffles and weed beds. Emergers Use a pupa pattern and fish it up-and-across so it sinks, then slowly rises to the surface. Dead-drifting a pupa pattern in the surface film can also be very effective. Dries When the females are laying eggs fish low-riding caddis adult pattern will generally work best for this group. Fish it on a dead drift, with either an upstream or downstream presentation. |
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Spotted Sedge Caddis or Summer Caddis (Family: Hydropsyche) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Attributes | |||||||||||||
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Characteristic Size Larva Size – 10 – 16 mm - Adult Size – 10-15 mm Nymph Color Larva Color – Light Green, Tan, Tan/Green - Pupa Size – 10-15 mm - Pupa Color – Tan, Brown, Yellow-Tan w/ Tan or Light Green Shroud Dun Wing Color Mottled Gray Wing Dun Body Color Adult Color – Green-Olive or Brown-Green Body |
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| Habitat | |||||||||||||
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Nymphs Hydropsyche, net-spinning caddis don't build a case in which to live. Instead, they build a rough shelter of gravel and plant debris that they attach to the sides of rocks. Hydopsyche prefer moderate- to large-sized streams with warmer temperatures, somewhat slower currents, and smaller substrate The larvae of net-spinning caddis periodically crawl out of their shelters, let go, and drift downstream 40, 50, or even 100 feet. This activity occurs on a daily cycle, and peaks near sunrise and sunset. |
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| Presentation | |||||||||||||
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Nymphs Nymph fishing can be productive, but difficult. Use a strike indicator to help spot subtle takes. Fish eddies behind rocks, current seams, and bottom. Fish the riffles upstream with relatively short casts of 15 to 30 feet. Emergers Swing soft hackles downstream during the hatch using standard soft hackle swinging techniques. Dries Rigg for using tackle and tactics for standard dry fly fishing. Fishing upstream, across stream, or downstream can all be effective. Fishing down-and-across with a slack line so the fly drifts naturally downstream, then rises to the surface just in front of a feeding fish is often deadly. |
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Green Rock Worm (Family: Rhyacophila) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Attributes | |||||||||||||
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Characteristic Free Roaming Size Larva Size – 11 – 18 mm, Pupa Size – 8-16 mm, Adult Size – 8-16 mm Nymph Color Larva Color – Green Dun Wing Color Adult Wing Color -Mottled Gray Dun Body Color Adult Body Color - Green to Brown-Green |
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| Habitat | |||||||||||||
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Nymphs All species occur in moving water and primarily in riffle habitat in cool, clean streams and rivers. Green rock worms are referred to as free-living caddisflies because the larvae do not build cases and thus remain exposed or “free-living” throughout their development. Once fully grown, the larvae construct rough shelters out of sand and small pieces of gravel. Inside these sealed shelters, the larvae turn into pupae. After four to six weeks, the pupae are mature and ready to swim to the surface for adult emergence. Nymphs Rhyacophila are common in extremely fast riffles on medium-sized streams, and while trout sometimes feed heavily on the larvae, it's usually during the low light conditions near dawn and dusk. Most anglers cast imitations in water that is too slow or during the wrong times of the day. |
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| Presentation | |||||||||||||
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Nymphs The Green Rock Worms favor riffles, and they often drift in the current. Emergers A larva pattern is effective when drifted through riffles near the bottom. Dries Adults hatch in the afternoon from late spring through August, and pupa patterns are effective during the hatch. For a couple of weeks after the hatch, adults often land on the water and are taken by trout. This provides excellent dry fly opportunities. Females swim or crawl underwater to lay eggs. You can fish a dry at this time, or go subsurface with a Soft Hackle or Diving Caddis pattern. |
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Mayfly
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Blue Wing Olive (BWO) (Family: Baetis) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Attributes | |||||||||||||
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Characteristic Swimmer Size 3/16" to 1/2" Nymph Color dark-brown, olive-brown, olive Dun Wing Color smokey Dun Body Color olive to olive-brown |
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| Habitat | |||||||||||||
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Nymphs The BWOs are of the swimmer group of mayflies. The BWO nymphs live in sun struck riffles and the runs below the riffles where algal growth is present. Emergers Most BWO nymphs swim to the surface to emerge in the runs below sun struck riffles, eddy pools and calmer water. Some BWO nymphs crawl to the edges and emerger at the rivers edges and climb out on sticks and rocks to make their transition to duns. Duns Most BWO Duns are found in the runs below sun struck riffles, but certain species will hatch in rougher nervous water in smaller riffles. BWO duns are often found in eddy pools and spring creek type waters. |
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| Presentation | |||||||||||||
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Nymphs Free drifted near bottom using split shot and indicator methods or tight lining Bouncing the nymphs on the bottom using tight line methods or under indicator close to the bottom in the runs below riffles. Prior to hatch use unweighted nymphs or soft hackles with a traditional wet fly swing inches deep. During hatch present unweighted nymphs upstream just as you would a dry. Fish an unweighted nymph under a dry fly as a dropper during the hatch. Emergers Fish the smooth currents Fish upstream from slightly to the side presenting your flies 1 to 2 feet upstream from the targeted fish Fish across stream with a reach cast. Fish from upstream presenting your fly down from slightly to the side with a downstream reach wiggle cast. Dries Use 12 to 14 foot leaders, with 3 feet of fine tippet, 5x, 6x, 7x if necessary Best to fish from across using a reach cast or present downstream to targeted fish using a downstream reach wiggle cast. |
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Western March Brown (Family: Rhithrogenia) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Clinger Size 5/16" to 1/2" Nymph Color dark-brown to olive-brown Dun Wing Color mottled brown/tan Dun Body Color brown on top, tan below |
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| Habitat | |||||||||||||
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Nymphs The March Brown Mayflies are well adapted to spring creeks and tailwaters which in some years can provide a welcome dry fly hatch here on the Lower Yuba River. PMDs thrive in riffles and runs. They Browze on thin layers of photosynthetic growth that covers bottom rocks. Populations are dimminshed in tailwater locations after when scouring occurs which can happen on our Lower Yuba River. |
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| Presentation | |||||||||||||
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Nymphs Rigg for fishing nymphs with shot and indicator and roll nymphs along the bottom. Emergers You should present emergers and dries just as you would any dry fly with long leaders and fine tippets. When fishing upstream from a downstream position, make your presentations up and across. When fishing straight across or downstream from an upstream position use a reach cast from straight across or a downstream wiggle cast from an upstream position Traditional wet fly method, on the swing Duns Fish near the rough water near where the nymphs live in but to the softer seams a edges. Fish the nearest flat water Naturals often hatch on long smooth flats as well. |
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Pink Ladies, Pinkies, Pink Ladies or Yellow Quills (Family: Epeorus) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Clinger Mayfly Size Nynph and Dun Size 8 – 15 mm or 5/16” to 5/8” Nymph Color Brown to Dark Olive Brown Dun Wing Color Yellow, Tan Dun Body Color Yellow tan |
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Nymphs Pinkies live and are adapted to fast, turbulent riffles and are poor Swimmers When presenting nymphs, concentrate on areas below riffles in runs using deep presentaions. The emergers and duns most important phase for fly fishers. Emergence takes place in pockets and fast runs and riffles. The runs and tailouts below these water types are the where to concentrate your efforts. |
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| Presentation | |||||||||||||
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Nymphs Nympgs should be tumbled along bottom with split shot & indicator. Fish upstream in riffles and runs & down the seams between fast water and slow. Alss look for trenches. Emergers Fish emergers in the top 12” of the water column with un-weighted nymphs or fish soft hackles and flymphs just under the surface film. Dries On rough water fish upstream using traditional upstream methods quartering upstream with reach casts/ On smoother currents (a) Upstream at an angle and to the side (b) Across. Use the reach cast (c) Downstream use the downstream wiggle or parachute cast. |
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Pale Morning Dun or PMDs (Family: Ephemerella) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Crawler Size ¼” to ½” Nymph Color Olive Brown, Red Brown Dun Wing Color Smokey Grey Dun Body Color Pale Yellow to Tan |
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Nymphs PMDs are well adapted to spring creeks and tailwaters like our Lower Yuba River. PMDs thrive in riffles and runs. Browze on thin layers of photosynthetic growth that covers bottom rocks. Populations are diminshed in tailwater locations after when scouring occurs. |
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| Presentation | |||||||||||||
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Nymphs When fishing nymphs for PMDs, rigg with shot and indicator and roll nymphs along the bottom. Fish the Gary Borger Shotgun method and systematically cover the water. When hatch begins, fish un weighted nymphs a few inches deep using 5x or 6x tippet Use a dry dropper with an unweighted nymph. Emergers When fishing emergers and dries, present just as you would a dry fly with long leaders and fine tippets. Present up and across from a downstream position. Use a reach cast from straight across or a downstream wiggle cast from an upstream position |
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Pale Evening Dun or PEDs (Family: Heptagenia Elegantula) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Dries |
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Characteristic Clinger Size Nymph Size 6 – 12 mm ¼’” to ½” - Dun Size – 7-15 mm ¼” to 5/8” Nymph Color Dark Brown to Olive-Brown Dun Wing Color Pale Yellow Dun Body Color Pale Cream to Tan |
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Nymphs PEDs are a.dapted to clinging to the substrate of fast water, but commonly inhabit the slow to moderate reaches Nymphs rarely found in the drift until days preceding a hatch. A few days prior to emergence the nymphs migrate from water with moderate currents to side pools, eddies and shallow runs. |
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| Presentation | |||||||||||||
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Nymphs Rigg with split shot and indicator and fish deep. Use Gary Borger’s Shotgun Method to cover the water. Fish the shallows at evenings without shot but use a small indicator. Swinging un-weighted nymphs can be effective in eddy pools in the evenings. Emergers Use shallow nymphing methods Rigg with an indicator two to four feet up the leader Or without an indicator with leader dressed with floatant Or as a dropper below a dun. Or on the wet fly swing in eddies and near the banks. Dries Fish the hatches on the smooth quiet waters and along the edges. Fish the backwaters and eddies Have patience and work sighted fish taking PED duns or emergers. Use long fine tippets 5x, 6x Use delicate presentations and techniques. |
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Slate Drake Mayfly or Great Western Leadwing (Family: Isonychia) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Swimmer Size ½” to ¾” Nymph Color Black, Red/Brown Dun Wing Color Dark Gray w/mottling Dun Body Color Grey, Red/Brown |
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| Habitat | |||||||||||||
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Nymphs Live in riffles and hey often perch on tangled branches or debris that trail into fast water They are extremely strong swimmers They emerger in late afternoons, evenings and just after dark Look for cast away nymphal casings on the rocks along or just below riffles for indications of hatch |
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| Presentation | |||||||||||||
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Nymphs Mimic the bold swimming style or the nymphs Present with long strips in slow water. Rhythmic rod tip action in fast water. In riffles tumble along bottom Swing flies to the bank blow riffles with a rhythmic action casting down stream. |
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Tricos (Family: Tricorythodes) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Crawler Size Nymph Size 3 – 10 mm 1/8” to 3/8” - Dun Size – 3-6 mm 1/8” to 1/4” Nymph Color Dark Brown Dun Wing Color Whiteish Dun Body Color Dun Body Females Color – Olive Abdomen, Dark Brown Thorax - Body Male Color – Dark Brown |
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Nymphs Tricos are distributed across the entire continent. They inhabit slow flowing rivers and streams and portions of some lakes where you may try fishing |
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| Presentation | |||||||||||||
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Nymphs Present the nymph upstream or cross-stream to spotted trout or likely lies. You should fish it dead drifted a few inches to a foot or so deep. A tiny yarn or hard indicator two to four feet up the leader will help detect strikes. You can also fish a Trico nymph suspended under a dry fly that represents an emerger or dun. Emergers Use light lines, leaders twelve to fifteen feet long, with three to four feet tippets of 6x or 7x. Wade carefully into position and place your casts accurately into a very narrow feeding lane. Use cross stream reach casts or downstream wiggle casts for drag free floats. Cast upstream to it, but place the fly only a foot or two above it. Nymphs Use the same techniques as described for presenting Trico emergers. . Nymphs Trico Spinners You will also fish the Trico spinner fall the same way as you do the emergers and the duns. Single out a feeding trout, time its rises, cast a foot or so upstream from it, right in its feeding lane. If you get refusals, lighter up your gear, lengthen your leader and go to a finer tippet before you change up your patterns. |
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Stoneflies
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Skwala Stonefly or Brown Willow Fly (Family: Perlodidae) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Crawler Size 22-38 mm Nymph Color Mottled Yellow Olive/Brown Dun Wing Color Adult Wing Color - Dark Gray Dun Body Color Yellow/Olive/Brown w/ Yellow Markings |
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Nymphs Like the other stoneflies, the golden stonefly nymphs habitat is quick choppy riffles with a substrate of large gravel and cobble. Prior to adult emergence the nymphs migrate to the banks where they crawl out of the water when ready to become adults. Usually they crawl out on the banks, large rocks or even a limb or log. Trout tend to feed on them along the banks when the hatch starts. |
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| Presentation | |||||||||||||
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Nymphs Fish the runs and riffles using the "high stick" method. Use shot and indicator methods. Fish the nymph imitation about an hour before dark to simulate the migrating behavior with you nymph imitation. Fish below the riffles and swing the flies to the bank. Use a down and across presentation utilizing a reach cast allowing the fly swing from the runs and riffles all the way to the bank. Add a lot more weight to the fly to keep in on the bottom than you normally would. Dries Fish using dry imitations along the banks in the slack water below the riffles. Fish from the river casting to the bank upstream with a reach cast. Fish downstream using the wiggle or parachute cast to present flies in the slack water along the banks. |
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Little Yellow Stonefly or Yellow Sally (Family: Isoperla) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Size 7 – 16 mm Nymph Color Mottled Tan/Brown w/ yellow markings Dun Wing Color Dun Body Color Yellow to Light Brown Body Yellows can be very bright |
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Nymphs Like the other stoneflys, nymphs their preferred habitat is quick choppy riffles with a substrate of large gravel and cobble. Prior to adult emergence the nymphs migrate to the banks where they crawl out of the water when ready to become adults. |
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| Presentation | |||||||||||||
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Nymphs Before emerging, most nymphs migrate toward shore. As they move from the subsurface structure, they become more visible and risk becoming dislodged. When a good quantity of aquatic insects drift in the water, trout notice them. This is a great time to fish nymphs. Dead-drifting, dead-drifting with an occasional twitch, and swinging flies in the current are effective techniques of imitating this activity. Dries Fishing using soft hackles Both dead-drifting and swinging wet flies can work. You can mend your line up- or downstream to regulate the fly’s rate of travel. Dead-drifting an adult pattern is usually the best technique, but at times a more active approach can be productive. |
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Golden Stonefly or Golden Stone (Family: Callineuria Pacifica) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Size 22 – 38 mm Nymph Color Mottled Brown to yellow-tan Dun Wing Color Dun Body Color Yellow-Brown to Golden Head and Abdomen, Medium Brown Wing |
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Nymphs Like the other stoneflies, the golden stonefly nymphs habitat is quick choppy riffles with a substrate of large gravel and cobble. Prior to adult emergence the nymphs migrate to the banks where they crawl out of the water when ready to become adults. Usually they crawl out on the banks, large rocks or even a limb or log. Trout tend to feed on them along the banks when the hatch starts. |
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| Presentation | |||||||||||||
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Nymphs Nymph Presentation: Fish the runs and riffles using the "high stick" method. Use shot and indicator methods. Fish the nymph imitation about an hour before dark to simulate the migrating behavior with you nymph imitation. Fish below the riffles and swing the flies to the bank. Use a down and across presentation utilizing a reach cast allowing the fly swing from the runs and riffles all the way to the bank. Add a lot more weight to the fly to keep in on the bottom than you normally would. Dries Fish using dry imitations along the banks in the slack water below the riffles. Fish from the river casting to the bank upstream with a reach cast. Fish downstream using the wiggle or parachute cast to present flies in the slack water along the banls. Nymphs Nymphs |
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The Others
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Grasshoppers (Family: Scientific Name: genus Orthoptera Common Names: Hopper) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Terrestrial Size Adult Size: 30-40 mm (1-3/16 to 2 in) Nymph Color Not Applicable Dun Wing Color Not Applicable Dun Body Color Adult Color: Yellows, greens, yellow-greens, tans, browns |
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Roe or Eggs (Family: Common Name: Fish eggs) |
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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Characteristic Not Applicable Size Size: 5-12 mm (3/16 to 1/2 in), typical Nymph Color Egg Color - Varies widely depending on species and state of egg Dun Wing Color Not Applicable Dun Body Color Not Applicable |
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