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Re: Nymph Survey Through the Seasons
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2016/1/24 14:30
From Gettysburg
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Having re-visited the three riffles last month (July) that were surveyed in April, the results across the three streams showed noticeably fewer macros. While I expected to find fewer and smaller nymphs in summer, this drop was more pronounced than I had predicted.
Here are the results for July:

CONOCOCHEAGUE:
Mayflies:4
Caddis: 3
Stoneflies: 0
Scuds and Cress Bugs: 0
Crayfish: 1

YELLOW BREECHES:
Mayflies:38
Caddis:1
Stoneflies: 0
Scuds:48
Cress Bugs:0

LETORT:
Mayflies: 1 (very small)
Caddis: 0
Stoneflies: 0
Scuds: 6
Cress Bugs: 26
Other: 3 Crayfish, 1 Worm




Posted on: 8/13 10:52


Re: Nymph Survey Through the Seasons
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From Gettysburg
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In particular, note the steep drop off of mayflies at all locations.

While one would expect to see fewer nymphs due to hatching in the previous weeks, this suggests that opportunistic trout may be more likely to be focused on other forage species.

Breeches, for example, dropped from 78 mayfly nymphs in April down to 38 in July. On Conococheague, mayflies dropped from 18 in April down to 4 in July. Letort mayflies dropped from 13 down to just 1 very small nymph.

In addition to such drops in numbers, the mayflies were notably smaller at all stations.

Cress bugs were much fewer at Letort, however I should note that seining Letort was hard this summer. Unlike Breeches and Conococheague, which had lower water levels this month, Letort was choked with weeds in the survey riffle and water levels were actually much higher and slower than in the spring and this may have impacted the number of macros captured.

A brief side observation is that crayfish increased since springtime.

Posted on: 8/13 11:01


Re: Nymph Survey Through the Seasons
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Joined:
2016/1/24 14:30
From Gettysburg
Posts: 1747
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Will return to these spots in October and check again.

After the final survey in October, I'll re-capitulate the results and write up a conclusion. This may be posted in article format on the home page.
DW

Posted on: 8/13 11:02



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