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Topic: Freshwater Rotifer (Read 14597 times)
Vale!
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Re: Freshwater Rotifer
«
Reply #150 on:
November 15, 2016, 02:25:23 pm »
I netted a GDB this morning (I've parked a net on the bath's side so I can swoop at a moment's notice!) but from its smaller size I'm sure it wasn't the one I saw the other day.
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Re: Freshwater Rotifer
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Reply #151 on:
December 07, 2016, 10:04:25 am »
A serendipitous event ...
I'd kept the net on the side of the bath, ready to scramble if GDB(s) appeared on the radar. This morning I noticed that the net wasn't there where I'd left it. I ventured out to investigate.
The net had fallen into the bath, so I rolled up my sleeve and prepared to hoik it out again. I saw it was covered in what appeared to be fibrous grot ... only it wasn't that. As I pulled it up most of the grot fell off ; and when I got it airside I saw that the grot was in fact blackworms! They were mostly smaller ones, too - ideally sized to fit in fish mouths.
I took a pic of what remained on the net (attached). This is a really useful discovery : catching blackworms is a bit of a pain normally. I'll have to see if this trick works on my indoor culture, too!
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Gingerlove05
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Re: Freshwater Rotifer
«
Reply #152 on:
December 07, 2016, 11:10:48 am »
Nice discovery, makes feeding times easier
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plankton
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Re: Freshwater Rotifer
«
Reply #153 on:
December 07, 2016, 11:49:15 am »
They must have known, and knocked the net off accordingly!
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Re: Freshwater Rotifer
«
Reply #154 on:
December 08, 2016, 12:57:47 pm »
Yes someone .... or some
thing
must have displaced it. Something more brutish than a wee innocent worm perhaps ...
I went to check the net this morning to see if it had attracted another blackworm conference (it had) and when I lifted it out of the water I was greeted by a Guest Star leaping around in it (pic#1).
It isn't a GDB but has six legs, so is an insect larva* of some kind. It's 2cm long. From the traces of what (I guess) will be wing cases, its imago will probably be a beetle. I took it inside and put it into a little plastic container to photograph better : pics #2 - #4.
Pic #5 is the best side-on image I could get. It doesn't look particularly vicious to me ... but a blackworm may well have a different perspective, of course! It's not one of the usual suspects - dragonfly, mayfly etc. - but what is it? I've looked at Google images and didn't find an exact match. This could be a job for GL and his bug book!
For the moment I've parked it in one of my tubs of RO/DI pending a visit to a local pond. When I put it in it immediately unfurled 'feathers' on its rearmost pair of legs, turning them into oars. The other remarkable thing was that it had captured a layer of air which completely covered its back, making it look entirely silver in colour. I've tried to show those characteristics in Pics #6 and #7 but don't know whether they're good enough to be successful.
* although I suppose it
could
be the finished article rather than a larval stage?
«
Last Edit: December 08, 2016, 01:11:01 pm by Vale!
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Munchy2007
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Re: Freshwater Rotifer
«
Reply #155 on:
December 08, 2016, 01:12:00 pm »
Is it some kind of water boatman?
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Re: Freshwater Rotifer
«
Reply #156 on:
December 08, 2016, 01:18:09 pm »
Thats what i thought looking at the legs in the last couple of pics.
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Re: Freshwater Rotifer
«
Reply #157 on:
December 08, 2016, 01:32:56 pm »
Yes! Well done you two! I'd been searching using terms such as "aquatic coleoptera larvae" but "water boatman" throws up an exact match! It looks like it's one of the five 'instar' forms that water boatman nymphs seemingly go through.
Apparently they're able to eat Daphnia etc. as well as algae. I now wonder if it was really having a go at the blackworms or whether it just happened to be going from A to B and the net happened to be in its way.
In the interim I've e-mailed Freshwater Habitats and pointed them at the pics here. So if you're watching, FH, sorry to have bothered you!
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plankton
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Re: Freshwater Rotifer
«
Reply #158 on:
December 09, 2016, 12:07:52 pm »
It looks very much like Charon.......and don't pay him!
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Re: Freshwater Rotifer
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Reply #159 on:
December 09, 2016, 07:58:16 pm »
Had to look that one up, didn't realise that was his name
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Re: Freshwater Rotifer
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Reply #160 on:
December 09, 2016, 08:00:22 pm »
So did, and I'm rather disappointed in myself, I'm normally pretty good with my greek mythology
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Re: Freshwater Rotifer
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Reply #161 on:
December 09, 2016, 08:09:54 pm »
It's all greek to me
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Re: Freshwater Rotifer
«
Reply #162 on:
January 14, 2017, 09:11:40 pm »
This thread is very, muchly interesting and I have duly bookmarked it for future reading
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Re: Freshwater Rotifer
«
Reply #163 on:
January 15, 2017, 12:23:56 am »
Some great pictures Vale! and good to see the abundance of different insects and wildlife you have there it beats living in a city where all you have is concrete and cars to look at.
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Re: Freshwater Rotifer
«
Reply #164 on:
May 07, 2017, 12:33:41 am »
Inspired by GlassWalker's latest report on his pond/wildlife refuge I went out after dusk with a torch to inspect my little construction. Upthread I reported finding a frog in my bath and thereafter making a catproof shelter in a corner of the garden for it and for any friends that it had lurking in the wilderness. The shelter included a washing-up bowl which I filled with invert-water and a few stones.
I could see by the light of the torch what seemed to be a lot of mosquito larvae (which I'll harvest tomorrow!) but got the impression that there were different squiggly things there too. So I went and got my camera and took a few shots blind, as it were, to see if the result would be more informative. I've just now looked at the pics and the best one is attached. I'm trying to convince myself that those black things might be tadpoles! I'll have a better look in daylight tomorrow.
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