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Plecoptera - Stoneflies
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Some Other Arthropods
Signed copies of Matching the Hatch - Pat O'Reilly's best selling 245-page full colour book on aquatic flies and their imitation - are available by print-and-post form or by Credit Card or Debit Card via our online Bookshop, with PayPal Security for just £16 including P&P.
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Wild Trout Flyfishing

Isoperla grammatica - Yellow Sally

Yellow sally nymph

The Yellow Sally is a medium-sized stonefly and very common on Welsh rivers and streams; its slow, creeping nymph spends most of the time beneath stones where trout are unable to find it. When ready to transpose to a winged adult, the nymph moves into the shallows. Usually it leaves the water either by crawling up emergent vegetation or by climbing onto a partly submerged stone.

Adult yellow sally stonefly

The adult appears as a sulphur yellow blur in the summer sunshine, and it is one of the very few insects that 'hatch' during the heat of the day. A related species, the Large Yellow Sally (Chloroperla torrentium) is very similar apart from size and is also most likely to be seen during the daytime.

Special Offer - author-signed copies: £14-00 + £2-00 P&P = £16

Matching the Hatch

Signed copies of Matching the Hatch - Pat O'Reilly's best selling 245-page full colour book on aquatic flies and their imitation - are available by print-and-post form or by  Credit Card or Debit Card via the PayPal Secure Server for just £16 including P&P.

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