Please watch the following videos in HD, you can get a clearer picture of the nymphs.

This mayfly nymph has a body lenght of 5mm and 3 tails, greyish color on the body, Is it a Baetis Rhodani?



I would also like to know what type of mayfly nymph this is, it has a body lenght of 5mm and 3 tails and a yellow color, a baetis probably but what kind of baetis?


Thank you for your help
Best regards
Robert

Theres not enough info for me i am afraid, if you still have the samples you could post them to Craig macadam. There is a great chart from peregrine of the various mayfly nymphs in the country, if you are interested.... you will find they are all 3 tails.There also a new FBA guide just published.
From our limited outlook the specie that some individuals do seem to turn Yellow and semitransparent for some reason is Empherella ignita, you can usually identify them by the 'rocking horse' movement, but i am afraid your sample didn't give enough away

Your upper sample could well Rhodani as the tail dimensions are right, but it could also be many other's. Sorry I am not much help, I hope someone else is.

Mayfly Nymphs
Peregrine Production
Unbound | 2001 | #123971
NHBS Price: £1.75 | $3/€2 approx.
http://www.nhbs.com/mayfly_nymphs_tefno_115135.html


alternatively if you want to spend a bit more...

SP 66. Mayfly Larvae ..
http://www.fba.org.uk/index/books/scipubs

Serratella ignita

Serratella ignita if you please WP; how many times must I say?

Yes you could be right; the Ephemerellidae are spiny or moss crawlers - the family's only other UK member is the more yellow Ephemerella notata which also fits the bill.

Baetidae are known as the agile darters. The size difference would be about right too.

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Save the softmouth trout

Normally I would note your chastisement and would admonish myself with an evening writing out 1,000 lines of I must stop using Ephemerella for serretella, and then feel duly ashamed.

However as you freely admited to turning chanels to the X FACTOR last
night, you have lost all credibility round here.

Beer comes in pints
Houses are made in Imperial measures.
Manchester is in the county of Lancashire.
Cars do miles to the gallon
And blue wing olives are Ephemerella ignita

............so up yer bum!

I live in sweden and these are from a swedish river.

So you guys think the yellow one is a Ephmerella ignita?

Is Empherella ignita the same as a Serratella ignita?

Could also be Ephemerella notata.

Serratella ignita was split off to its own Genus in 1996 after DNA testing showed they were not as closely related as taxonomists previously had them. As WP lives in the past one must make allowances and all of his dusty reference books would be correct.

__________________


Save the softmouth trout

okey, thanks for trying to help me out, it is very much appreciated.

I know it might be hard to give an exact genus based on these videos alone..but all the photos I took just didnt work so I had to film them instead to get clear picture.

I might aswell say sorry for the spelling mistakes that might show up in my posts


By the way the first Video just screams baetidae but what genus?

Yes your right, and most normal people would call it Ephemerella( watch where you put your 'M's) ignita.
However some jumped up, precosious, la de da, poncy, science types, have gone all trendy and decided to confuse matters, by giving it yet another name Serratella.

Mind you Ephemerella was always been one to call a spade a digging implement.

No one spells well on this forum, we work in English, its a stupid illogical langauge even for the Natives.

Hi rob, your first sample is almost definitely one of the Baetidae family but genus is anyone's guess as you can't see the gills. The second yellowish one is not so easy to be so sure about. It looks like one of the juvenile Heptagenidae to me, the head's wider than the body unlike our Baetidae that have a more streamlined shape. March Browns are one of the Hepts that have that kind of shape but unfortunately your picture is a bit vague to even approach a decent identification. Try the macro setting on a digital camera next time, you can get some great results.

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Musha rig um du rum da

I did take one other video of this yellow nymph but there was also a caddis larva in that video, most probably a Hydropsychidae..

but in this video the yellow nymph can be seen a bit more, the eyes are cleary ontop of its head..could Diawl bach be right? is it a Heptageniidae??

I just found it strange that it can wriggle and swim fast when put in deeper water, I thought that when a Heptageiidae looses its grip of the river bed it just drifts with the current until it can grasp a hold of something, it doesnt swim at all so to speak.

here is the video and remember to choose the 720P version.