Cladocera Species Safe Aeration Kit

This kit contains 2.5meters(~100inches) of standard soft 4mm clear air hose and 5 marine grade 1/4inch stainless steel Hex nuts for use as sinkers.
Enough to set up 5 cultures at about ~$2 each.

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Cladocera Species Safe Aeration Kit

This pack contains 2.5meters(~100inches) of standard soft 4mm clear air hose, along with five 316 marine grade 1/4inch stainless steel Hex nuts.
Enough to set up 5 cultures at about ~$2 each.

This is the very same equipment that I use on my own cultures and after after trialing heaps of different things(in standardized side by side trials with a control), these are bloody PERFECT!

Air stones, bars, curtains and even the fine plastic aeration devices commonly used for the propagation of fish are generally not suitable for the production of Daphnia, Moina, Simocephalus and most other small freshwater crustaceans.
Well they are, it’s just not “ideal”.

The main reason for this is physical. They have a shell.

That shell is made of a series of impenetrable and overlapping plates which encase their delicate internal appendages and organs.

Works really really good in a wild situation as anything hard just bounces or slides off the surface.
The problem that happens with conventional aeration in fish tanks is that air is not hard, it is soft and flexible, yet at the same time it have a very strong upwards force.

Because of the flexibility, it easily works it way between the layers of shell and carpice of any crustaceans that happen to be swimming along above the bubbles.
Then that massive powerful upwards force rips and separates the sensitive body tissues inside as it yanks the poor little bugger towards the surface.

This immediately kills a very small % of victims.
Some it doesn’t immediately kill, instead it traps them on the surface where they can not feed.
Those poor fellas swim round in circles until they eventually starve and die.

An even greater % only get microscopic damage, too small to see or even effect their movement in any great way.

BUT, that damage is normally micro air bubbles being forced into the gut where they lodge and prevent food absorption, or they are forced into the rectum or brood chamber, where they prevent feeding and breeding, two thing you are trying to maximize.

This is not normally visible to the naked eye and many folks will assert that they have cultured using Airstones and similar devices for years without any noticeable issues.
Not going to argue with that, I do totally believe you.
I really do.

Species like Daphnia breed so fast that it is not often a major visible issue.
The damaged and dead break down and completely disappear very quickly often within a day, so the bodies might not have ever even been seen, especially with a large amount of fine bubbles disturbing the waters surface.

What I will say is that it is that it is not “ideal”.
If you are mass culturing anything the ideal should be your aim both for the welfare of the creature and for productivity reasons.

It does increase the chances of a crash as the decomposing bodies introduce more food for the bacteria to feed on, which increases the chances of Ph swings, which increases the rates of infection in damaged but still alive Daphnia, which increase the chances of general mortality, which increases the chances of Ph swings, which increases the rates of infection in damaged but still alive Daphnia, which increase the chances of general mortality and round and round it goes…

The second reason I do not recommend these devices is chemical.
They were not designed with Cladocera in mind and they can do more harm than good.
Especially the mineral, stone, sandy textured ones as they are made by the crushing and then gluing together of rocks and minerals.

These rocks and minerals do bugger all to humans or fish, but they are exactly the sort of things Cladocera are sensitive to, as they accumulate minerals, metals and salts in their shells.
The constant leaking, or occasional dumping of minerals and metals(especially when the Ph changes)into the water does nothing to most fish.

It DOES effect Cladocera, and mostly in bad ways.
As the effect is gradual, or only rarely, occasional and dramatic(in the case of Ph changes), it is normally not even considered to be possible by most folks, even those with lifetimes of experience in the aquarium or aquaculture industry.

I am not after an argument, and you are welcome to do your own research including side by side testing if you wish.

I have and as such, I do strongly assert it can cause problems including trouble with molting shells or formation of eppipia.
I can also cause defects via metal toxicity or just physical deformation.
It can cause sterility or lower reproduction rates.
It can trigger a crash where everything dies, and I personally believe based on my own side by side statistics, it should much more often be considered a causative effect.

These are all also valid reasons to not use any other metal or weight except the much more expensive 316 marine grade stainless steel.
The reason I use these 1/4inch stainless steel hex nuts is that they fit any standard 4mm air hose perfectly and are just heavy enough to keep the hose in place providing lots of aeration to your culture.
They just work perfect.

In “ideal” conditions aeration is a massive benefit, as more oxygen means higher densities are possible.
More critters per litre or gallon of water!

Fine bubbles mean a greater absorption of air into water is possible, which is awesome too!

But large bubbles also produce a much greater absorption of air, not quite as large as with super fine, but still many many times greater than without aeration at all.

The main advantage of large bubbles is they have more upward lifting force.
They also have a greater force holding them together and this very strong force prevents them splitting them into smaller parts.
This means they push more water out of the way as they rise to the surface.
This means instead of wedging inside or under the shell of a mini-critters, they just whoosh past pushing the whole creature out of the way unharmed.

This is what I use, and I use it because it works best based on my own very extensive research and testing.
I strongly recommend you do too.

Extra Air = Good.
Small bubbles and mineral air stones = Bad.
My Cladocera Species Safe Aeration Kit = BEST!