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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
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.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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.
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JAD
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Alexandria Pa

Posts: 362
JAD on Sep 5, 2009September 5th, 2009, 7:24 am EDT
Hi all
I was;t sure how or what to post this under. I know my friends on the board, would never make fun at or with me so here goes.:)

Do frogs eat gold fish?. This is getting really expensive, I have placed 80 gold fish in our gold fish pond. In a two week period I have one left, before you ask no turtles, heron, king fishers or neighborhood rascals. (kids) Their are three older Goldfish about 4 inches and a few tadpoles with a few frogs so water is ok . I know their are some really great minds on the forum ----Any Ideas.

Pond Manager

JAD AKA--Caddisman1

They fasten red (crimson red) wool around a hook, and fix onto the wool two feathers which grow under a cock’s wattles, and which in colour are like wax.
Radcliffe's Fishing from the Earliest Times,
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Sep 5, 2009September 5th, 2009, 8:34 am EDT
John-

Unless your frogs are bullfrogs, I would suspect another culprit. You didn't mention raccoons. And if the goldfish are small enough, like 1" or less, I would suspect some predaceous aquatic insect larvae, like dragonflies, water tigers (beetles), etc.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Sep 5, 2009September 5th, 2009, 5:04 pm EDT
John, I suppose you do need to stop the predators, but in the meantime, do you want to look into buying "feeder goldfish" at a Petsmart? They're darn cheap. You might be able to keep up that way. Also, have you thought about putting a net over the pond, the kind of black nets used to protect blueberry bushes, etc. might foil some predators. Don't know what you'd do about dragonfly larvae etc., though. Taxon, would draining the pond and starting over be a cure?
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Sep 6, 2009September 6th, 2009, 8:31 am EDT
Louis-

Taxon, would draining the pond and starting over be a cure?


I wouldn't think so, at least not for long. Assuming predaceous insect larva are the problem, I would expect them to reappear following the first flight period.

However, I like your suggestion of netting, and then stocking with "feeder" goldfish, as that would (hopefully) eliminate the possibility of predation from above, which would seem the more likely scenario.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Jmd123
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Oscoda, MI

Posts: 2474
Jmd123 on Sep 6, 2009September 6th, 2009, 1:48 pm EDT
How about SNAKES?? As in garter and water snakes, both of which regularly include fish in their diets. Both types (probably eastern garter snake and northern water snake) are attracted to prime frog habitat, which most small ponds are - and frogs are very common in their diets too. So, the presence of frogs brings them in (snakes have an extremely good sense of smell, or taste I suppose because their tongues are their primary chemoreceptors), and then they probably find the goldfish easy pickings. If so, good luck keeping them out, and I don't recommend killing them either, both for ecological reasons and because, like beavers, more will just move in if the habitat is prime...Perhaps VERY fine mesh would work, like plastic screening - just make sure you watch out for holes because snakes can squeeze through very small ones (as my daughter found out when her baby corn snake disappeared one day). GOOD LUCK!

Jonathon

P.S. Replace them with koi? They're a bit on the large size for most fish predators...
No matter how big the one you just caught is, there's always a bigger one out there somewhere...

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