Search results for query: Daphnia bioassay

It’s going ok, but I’m definitely at the point of needing healthy distractions! I am lucky to be part of a doctoral training partnership so my funding isn’t results based, although I am also lucky that my research so far has been fairly ‘successful’ in terms of finding interesting things...

Hi all, I can see you might need a distraction and I really wish you the best of luck, <"I never finished mine">, and I'll be honest, to some extent, I still <"feel bitter"> about it. I wouldn't expect any nitrite (NO2-), but <"your water report"> gives a minimum value of ~17 mg / L (ppm)...

...for the last 4.5 billion years - <"Scientists Discover The Water You Drink May Be 4.5 Billion Years Old | nyruralwater.org"> The <"Daphnia Bioassay"> is a pretty fool-proof method of telling whether your water is OK to use. Some people will get rainwater with single figure conductivity...

Hi all, Not really, I use the <"Daphnia bioassay">. Two water butts <"daisy chained together"> also helps. These are the back garden butts. I've still got two of the three butts, but the "daisy chained" green-blue butt (far left) sprung a leak and I had to replace it. This image was pre-2011...

There is some info here. But I think it’s pretty simple. https://www.ukaps.org/forum/search/2280717/?q=Daphnia+bioassay&o=date Daphnia are often available as live food from LFSs. They often turn up in my water butts by themselves. Dispersal in Daphnia is usually characterised as being driven...

...is fascinating, thank you all 😍I love the dedication to science over rumour here, I'm so glad I joined this forum 💙 @Tim Harrison A daphnia bioassay is an excellent idea, although I'd need to a daphnia culture first! But that would be useful for live foods as well, so maybe I'll look into...

...also lived in hard water areas so in terms of water pH etc I doubt it made much of a difference. Anyway, I don’t think a bottle of tannin extract will go off as such. And should be safe to store for a good while. If you’re worried you could test a suitably diluted solution with a daphnia...

I actually have one of these for my tubs, good call. I'll grab a second one and see if it helps. This is what gave me the hint (along with the smell) not to use the water as I borrowed the idea from you and threw some daphnia in there at the beginning of spring. There were none visible, and had...

Hi all, I just use the <"Daphnia Bioassay">. No swimming Daphnia means that that water goes onto the pots in the garden, without accessing the fish tank. If the butt water still has swimming Daphnia? I use it, even if it is a bit yellow. I have five water butts so I can always afford to empty...

It should be fine. But if you want complete peace of mind, don’t use it, or take up @sparkyweasel’s idea and use a daphnia bioassay. https://www.ukaps.org/forum/threads/is-this-rock-safe-for-shrimp.37672/ The vinegar test is just a diagnostic for carbonates. Many of the rocks used for...

Hi all, Shrimp safe is the issue really, because Daphnia etc are crustaceans anything that kills them is very likely to do for the shrimps as well. CO2 would be safest, I know that they apply it at night, when they are using phytoplankton for waste remediation, to kill Daphnia etc. or...

Older thread but I'm going to move to Rain water and do my bit. ill use the Daphnia Bioassay. In addition, I have been feeding my house plants with rain water this past 6months and I noticed their health is better. No more crispy ends. I read that fluoride from tap water can lead to damaged leaves

...our varies from a bout 30 microS in the winter to 120 microS in the summer after they've cut the corn etc. Pretty pure, I use the <"Daphnia bioassay">, but this will only work if you have a bit of carbonate buffering in your rainwater. I've <"used rain-water"> since the 1970s and I've...

Hi all, Still OK. @shangman uses / has used it. You might be interested in the <"Daphnia Bioassay">, it is a simple method for assessing your rain water. cheers Darrel

...<"large body of scientific work"> using it them bioassay organisms. I'm not claiming that methods like the <"Duckweed Index"> or <"Daphnia Bioassay"> are perfect, or fool proof, but they both <"combine accessibility"> with <"ease of use">. Their great advantage, for me, is that you don't...

Hi all, I'd agree to some degree, Daphnia would be tolerant of lower oxygen and higher ammonia levels than most fish. I'm sure there could be circumstances where it wouldn't work, but on the balance of probabilities I still think it is a viable method When you run an aquatic organism bioassay...

thanks you so much, yes my roof is 35 yo =)

...up over pH7, but you could get soluble zinc sulphates formed if you have very pure rainwater, suffer from industrial pollution or live close to the coast. The "Daphnia Bioassay" works in pretty much all circumstances, basically if you rainwater has swimming Daphnia it is fish safe. cheers...

Hi all, I keep some <"Daphnia in my barrels">. This won't work if you live somewhere where you get very pure rainwater, mine always has some carbonate hardness. Have a search for <"Daphnia Bioassay">. cheers Darrel

It's more about all the other stuff coming down the downspout I worry about. We have a ton of trees in the yard and around the house. We do have 1 barrel currently and the water in that is pretty much tea colored and full of leaves and what not. I'm sure I'll be able to find it online in some...

Hi all, I've used rainwater <"since the 1970s"> without any problem, have a look at the <"Daphnia bioassay">. A lot of <"serious aquarists"> still use rainwater, and we are lucky in NW Europe that we get a lot of it all year around. These are three of my five rainwater barrels. cheers Darrel

Thanks Darrel, that explains the water cutting. Honestly I think it highly unlikely the rainwater in rural N.Scotland running off a slate roof would be contaminated, unless it picks up combustion products deposited by open fires but I’ll take the risk and think it’ll probably be beneficial. Will...

...you have soft tap water (low/no dGH/dKH) then there isn't any point in cutting your rain-water with tap water, you've just added small amounts of chlorine, <"NaOH"> and <"PO4---">. I use the <"Daphnia bioassay">, but that will only work if you have some hardness in your rain-water. cheers...

Hi all, Good idea. Have a look a the <"Daphnia bioassay">. It is to do with the site indexing, basically you can't search for any <"three letter words"> from within UKAPS, which is why I put Hedera in my search, I knew we had an Ivy thread to which I had contributed, and I would have used...

Hi all, Yes, agreed these things are all relative. We have figures for the Daphnia species etc. because they are used in water quality bioassay etc. That is actually a reasonably higher level of dissolved oxygen for a species that naturally lives in eutrophic still waters. The situation is...

Hi all, Yes, should be OK. I'm pretty sure it is <"Carboniferous age limestone">. I'd be surprised if the rocks weren't fine, but I agree with @sparkyweasel that the <"Daphnia bioassay"> is a good idea. cheers Darrel

Hi all, This is actually easier in sea water, because you have a known composition (a datum) and you can take into account the 33 ppt NaCl etc. Yes pretty much, in a planted tank, for some parameters, even an order of magnitude of latitude isn't going to matter that much. The really critical...

Many of the rocks we use in our aquariums are inert and do not react chemically with our tank water, for instance those that are mainly composed of silica, like smooth river bed pebbles or cobbles. But quite a lot of rocks that are great to scape with are not totally inert and may have some...

Darrel do you mean Daphnia or shrimps with "browsing the leaflitter surface"? I was wondering is it a typo? If so that would mean leafliitter is enough to keep daphnia alive? I kinda strugle a bit to keep daphnia culture alive sometimes and they just disapear after clearing all the food (i...

Hi all, I use the same method (<"Daphnia bioassay">) to make sure that the rain-water for water changes is OK. I'd also add some <"structural leaf litter">, it acts as a browsing surface for the shrimps, and the humic and fulvic compounds produced complex any heavy metals, that may have become...

...out for an oily sheen on the water, which may indicate that you are getting un-burnt kerosene from planes taking off. I use the <"Daphnia bioassay">, it just means that you seed the water butt with Daphnia, and then look to make sure the water you draw off has some <"Daphnia in it">. As...

...because I have access to lab. grade analytical equipment (ISE, AAS, HPLC etc) and the staff who can use them. There is, it uses a bioassay as a proxy to indicate water conditions. I use a <"Daphnia bioassay"> for water quality, and a <"Lemna bioassay"> to assess nutrient status. cheers Darrel

Hi all, I use a <"Daphnia bioassay"> to test my rain-water. I seed the water butts with Daphnia and then when I draw the water off, basically if it has Daphnia present I know it is OK to use, and if there aren't any it isn't, and I need to clean the butt. I would be concerned by this as well...

...problems since the 1970's, but I've also got a KISS method of testing the rain-water for agricultural pollutants etc, it is the <"Daphnia bioassay"> it just means you have Daphnia in the water butt, and as long as there are swimming Daphnia in the water you draw off its OK to use. I've got...

...and the other plants are fine. I've also got a KISS method of testing the rain-water for agricultural pollutants etc, it is the <"Daphnia bioassay">. Our tap water also comes from a deep limestone aquifer, and is pretty devoid of solutes other than Ca++ and HCO3-, so it provides a...

Hi all, Tom if you had 3 tanks, you could have a third tank, without a filter etc but with a "floater", either Pistia or Limnobium would do. I should have some references for TAN removal by Pistia. I know the feeling, I bid on any suitable Eheim filters that come up on Ebay. I recently found...

Hi all, That would be quite interesting. If you assume that it is working by electrocoagulation, then it won't have much effect on the ammonia, but it would work a bit like a protein skimmer in the longer term. Methods of increasing REDOX values, like H2O2 and O3 generators (oxidators etc.)...

Cripes...I've just got used to the idea of the Twinstar...what other uses are they going to find for electrolysis? I agree though the data set is a bit spurious. Good luck with the daphnia bioassay...that'll be a first for a LFS:geek:

...who can't be convinced to establish plants (my first recommendation) or do a fishless cycle (my last act of desperation) before adding fish to a brand new tank. I might try and convince the manager to do a side by side daphnia bioassay with one of these and an unclycled filter and added...

...in the W. of England that was fairly rural. I use a really simple technique to check that the water is OK, it is called <"the Daphnia bioassay">, it just means you have Daphnia in the water butt, and as long as there are swimming Daphnia in the water you draw off its OK to use. Have a...

Hi all, I've got a mixture of bought rain-butts and old food containers, I haven't had any problem with any of them. I use the <"Daphnia bioassay"> as my water testing method. Because I have small tanks, make regular small water changes and I'm really tight with my money, I draw the water of...

...dependent upon the microbial conversion of ammonia to nitrate. There are risks involved with rain-water as well, but by using the "Daphnia bioassay" <http://www.ukaps.org/forum/threads/distilled-deionised-water.26098/> they are much reduced. The Staffs University water industry web pages...

Hi all, Good point,didn't think of that although this "Daphnia bioassay" is the technique I use for testing rain-water. It is suitable to test for a wide range of potential toxins: "The use of a Daphnia magna bioassay for rapid screening of acute intoxications with insecticides in dogs and...

...of the extra NH3 used enough oxygen to fall below the critical level <View topic - Bad start to the day>. I use rain-water, the "Daphnia bioassay" <Distilled / Deionised Water | Page 2 | UK Aquatic Plant Society> and have lots of plants, so it isn't something that I worry about. cheers Darrel

...that sinks naturally. Ivy and Box are always quoted as "toxic" but they were both long dead and I didn't have any problems. I use the "Daphnia bioassay", from this thread <Distilled / Deionised Water | UK Aquatic Plant Society>, if I'm not sure about wood, leaves, water etc. cheers Darrel

Hi all, I do, I use a really simple technique and it also feeds the fish. The Daphnia bioassay: <Distilled / Deionised Water | Page 2 | UK Aquatic Plant Society> & <http://www.environment-agency.gov.uk/static/documents/Business/daphnia208_1669241.pdf> cheers Darrel

This is off topic from the original post I know but if needed what could be used to help filter out nasties before rain water enters the barrel??

...Inquiry - Bioassays Using Daphnia>. Daphnia are actually quite sensitive to a whole range of pollutants (and presumably in a similar manner to other Crustaceans like shrimps) and are widely used in the water industry as "Canaries". <Daphnia bioassay - Google Scholar> cheers Darrel

...bio-assay, because they are sensitive to water pollution. I just draw the water off into a container assuming there are swimming Daphnia in the water, the water is OK to use. Daphnia bioassay: <http://www.environment-agency.gov.uk/static/documents/Business/daphnia208_1669241.pdf> cheers...

Hi all, First up, I have never kept Discus, but I'm still going to have my 2p's worth. I don't think every-ones tap water is suitable for keeping Discus, or any-other soft water fish, because much of the tap water in the S and E of the UK is extremely hard and full of agricultural pollutants...