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

Blue-winged Olives
Baetis

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.

This little pool in update New York is enjoyed by many tourists every day, and it still holds a few trout -- stockers mostly, but you can't complain about the setting!

From Mystery Creek # 62 in New York

Stream photos

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 Recently Added Photos

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.

Beetle ID

Hydrophilidae (Giant Water Scavenger Beetle) Beetle Adult

2 Pictures

This is a water beetle. It is the hardest object in the world to pick up with tweezers. The second hardest is Mount Everest.

Collected January 12, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected January 12, 2004 from the Namekagon River in Wisconsin and added by Troutnut on January 25, 2006

DMM
Posts: 34

DMM on Nov 18, 2006November 18th, 2006, 7:58 pm EST

Beetles can be very tricky to identify. It has been my experience that it is extremely difficult to identify many insects to the species level based on pictures alone. It may not be able to be positively identified to genus either. The family is probably correct though, except the family isn't listed here. The family should be Hydrophilidae. Hydrophiloidea is a superfamily designation. Having said that, GONZO's ID could be correct (and if he has the experience, probably is), it's just not possible for me to confirm this.

David

Troutnut