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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Arthropod Order Amphipoda (Scuds)

A freshwater amphipod (scud). Tiny crustacean common to many freshwater environments

Dorsal view of a Amphipoda (Scud) Arthropod Adult from Salmon Creek in New York
Scuds can be an extremely important trout food source. They are often the most abundant aquatic macroinvertebrate in their habitat.

They are crustaceans so they don't go through the same life-cycle complications as aquatic insects. They start out as small scuds, grow to be big scuds, and die. The most significant family to anglers is Gammaridae with the species of the Gammarus genus heading up the list. The smaller Hyalella species of the Talitridae can also be important.

Though they all share the same silhouette, they can come in a surprising variety of sizes and colors. They run from size 8 to as small as you wish to imitate. The most common colors are olive or tan, though they can be found with yellow or gray base colors as well. Shading is often illusive to describe with highlights of pink, orange, green and even blue at times. It pays for anglers to notice both size and color differences in the waters they fish.

Where & when

Preferred waters: Best in alkaline water

Scuds are present year-round. They do very well in both lakes and streams. This is especially so in the West with its greater abundance of the alkaline stillwaters preferred by these critters. They're generally associated with slow water and do seem to be the most common there, especially in spring creeks and lakes or ponds with extensive weedy littoral zones (shallows). But some swift-flowing streams still hold good scud populations, and they can even be found in the riffles.

Scuds are very sensitive to light and prefer to remain deeply hidden during the day. Overcast days and periods of low light are the best times for anglers to use their imitations.

Amphipoda Fly Fishing Tips

Highly imitative flies have proven very successful and many anglers swear by them. Gravid female designs with their flashy segments of bright orange may give them that extra "edge" of attraction at times. Most anglers prefer special scud hooks with exaggerated short and rounded shanks, especially for dead drifting. Traditional hooks still have their place for use with active retrieves.

Some respected angling authorities however suggest that fuzzy Hares Ears, Birds Nests, and Zug Bugs are equally effective. They consider specialized scud patterns an unnecessary extravagance taking up precious space in their fly boxes. This is a valid consideration, especially for those anglers that don't regularly fish water where these crustaceans are important. Regardless of fly selection, fishing them in and around weed beds with known populations is often a good choice in low light conditions.

Specimens of Scuds:

4 Adults

1 Streamside Picture of Scuds:

1 Underwater Picture of Scuds:

Discussions of Amphipoda

Pakistani amphipods
Posted by Halabano on Apr 2, 2009
Last reply on Apr 2, 2009 by Halabano
Hi! i m working on Pakistani amphipods. i want to be intouch with scientists & students working on amphipods taxonomy & ecology

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Arthropod Order Amphipoda (Scuds)

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