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Old 08-12-2018, 06:50 AM   #11 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

All the daphnia hatched and growing. After acclimating them to my tap water params, minus the chlorine of course, they went into a 10G plastic tub. If all goes well they should reproduce/replicate x10 every week.

I use a dual stage carbon filter to remove chlorine for my fishes and now for the daphnia. Usually people use aged tank water. Chlorine and dechlorinators will kill them off.
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Old 08-19-2018, 10:06 AM   #12 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

I recommend anybody that keep fish or plan to breed fish to raise daphnia. They're so easy.

I started with ~50 D. pulex, now I have hundreds and will reach thousands soon. I raise them in the basement where temperatures are stable (72F) in a 10G tub. I feed yeast and spirulina powder where the water is hazy. Their nutrition is relatively the same but yeast has more protein and spirulina has more iron and a few other vitamins. I cover my bases by feeding both. I don't depend on green water so I don't need to waste energy having the lights on 24/7.

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Old 08-19-2018, 03:15 PM   #13 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

Daphnia are "so easy" IF you keep multiple cultures going and keep thinning them out. It's easy for them to get TOO dense rather quickly and then crash.
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Old 08-19-2018, 06:08 PM   #14 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

Yup, it's not hard to thin them out. I have multiple tanks and a pond.

I've kept daphnia before and had it crashed from excel laced tank water change. I have my water situation worked out and things should be fine. I should keep a spare culture in a liter soda bottle though, in case.
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Old 08-20-2018, 04:44 AM   #15 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

Oh, when the daphnia 'crash' happens. There's going to be daphnia eggs in the container, probably. I should have revived them instead of scrapping the whole container.
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Old 08-20-2018, 08:32 AM   #16 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

Quote:
Originally Posted by mistergreen View Post
Oh, when the daphnia 'crash' happens. There's going to be daphnia eggs in the container, probably. I should have revived them instead of scrapping the whole container.
Maybe. If it's an end-of-season fall-winter decline when the Daphnia are expecting it, then hopefully there will be viable ephippia (resting cysts). But if they crash during a spring or summer rapid-growth phase due to overpopulation and sudden oxygen depletion, you may have nothing to salvage. They dont always make ephippia. My strategy is to give them away to as many local friends as possible so I can get a re-start culture when needed.
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Old 10-04-2018, 12:14 PM   #17 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

So, my daphnia tub crashed a month ago. I noticed the daphnia would group together on the bottom of the tub. They developed white spots on their backs which were ephippia. Also, the ephippia floated to the sides of the tub. I think I fed them too much (every day) even though I made it a point to only make the water hazy with the food, not cloudy. So a month later, the snails cleaned up the tub and the daphnia have return with me doing nothing.

I've heard from a guy on youtube that fed yeast and spirulina crashed his culture as well. I'm curious to what the issue is. I know yeast are living and can consume oxygen but there are no sugars around so they can't reproduce. And Spirulina is cultured in high pH waters so I wonder if that would affect the water params. The spirulina would grow in the tub as well....

So this time around, I'll only feed yeast and only once every couple of days.

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Old 06-20-2019, 06:56 PM   #18 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

I had another crash and I left the tub alone. This time green water developed. I then pipette the eggs off the sides, into the water. They love green water, much more than any thing you can feed them. I noticed the population grew much faster. They've eaten all of the green water within a few weeks and I'm feeding them again.
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Old 06-27-2019, 06:45 PM   #19 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

I started my daphnia culture in outdoor planters a few years ago, and continue to harvest daphnia year after year. I top the planters with WC water, never clean them, and let them over winter. I mount a window screen over to prevent mosquito from laying eggs. The planters are exposed to direct sunlight for most afternoon, so the summer temp can hit 90s in mid day, and the production drops, but never crashed. The most productive time is spring and fall. Certain time of the year I saw a lot of floating black pepper seeds, and I guess they must be ephippia, but I am not certain not knowing what they should look like. It’s care free life food.
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Old 06-28-2019, 06:03 AM   #20 (permalink)
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Default Re: Live Daphnia from frozen Daphnia?

Yeah, I find growing daphnia indoor easy too. I'll try a batch outside. I found a secret to growing green water. It just needs a dash of micronutrients.

The ephippia's color will depend on the species. Mine are white specs.
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