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I found an interesting variety of insect life in the stomach of a brown trout which I caught, approx 1.5 hours prior to recording the caterpillar image, I am going to add it in as an edit- the stomach contents.
I think I see braconidae and ichneumonidae present?
Can't see any braconids, the hymenopterans look like they are all ichneumonids, but fascinating to see so many in a single trout, I would have expected mainly diptera/ aquatic insects.
Is the one immediately below the largest insect, in the lower right of the image not possibly a braconid?
I could be seeing an antenna but possibly an ovipositor? It seems very straight and rigid and seems to be protruding from an abdomen.
Then again, this could be a feature of some ichneumons for all I know.
Caddis and froghopper made up the bulk of the food items. This is only a small part of the stomach contents.
I think that's an ichneumonid, most likely subfamily Banchinae, because of the large hypopygium (ventral plate just before the bas eof the ovipositor) also the wing venation (small/open areolet where there would be a large cell in a braconid). Many banchines and other subf. of ichnuemonids have a long ovipositor, and many braconids have a short one.
Thanks for this info and clarification. In that case there is probably no relationship here between what was in the fishes gut and what was on the caterpillar.
I must keep my eyes peeled for adult braconidae when up in the hills this coming summer.
Thanks for this ID Gavb, I tried to have a look for microgastrinae adult images just now, the best I found was a selection of dead ones from Canada, it was difficult to tell what size they were. Some of them looked a bit like the adult insects Ive added in above -mostly black with yellow/orange legs.
I found an emperor moth cocoon in early March and it was full of small disused, quite old brown cocoons very similar in size to the fresh white ones above, I found this cooon very close to where the cat was photographed last summer. Possibly a very similar species if not the same species.
Lat/Lng: 55.016, -6.064
OS grid ref: NW402766