Please can you share how do you make intentionallyment the propagation/cultivation of the Algae for to feed both your fish fry & your Daphnia?

[TiercelR]

Please can you share how do you make intentionallyment the propagation / cultivation of the Algae for to feed both your fish fry (alevins) & your Daphnia?
Many thanks in advance for your comments.

 

[Aqua67]

Spirulina powder and dry yeast. Get a water bottle and add enough dry yeast to make it appear milky. Then add the same amount of spirulina. Shake the bottle very well to mix all the powders and feed your daphnia a small amount each day. How much you need to add depends on how large your water bottle is. Keep it refrigerated and use it up within a week. Some people grind up fish flake food instead of using spirulina.

Or you can make green water the long way which is to put a jar of tank water in the window with some fertilizer and let nature do its thing.

You will probably get even more ideas if you do an online search.

 

[Sgooosh]

Spirulina powder and dry yeast. Get a water bottle and add enough dry yeast to make it appear milky. Then add the same amount of spirulina. Shake the bottle very well to mix all the powders and feed your daphnia a small amount each day. How much you need to add depends on how large your water bottle is. Keep it refrigerated and use it up within a week. Some people grind up fish flake food instead of using spirulina.

Or you can make green water the long way which is to put a jar of tank water in the window with some fertilizer and let nature do its thing.

You will probably get even more ideas if you do an online search.

a bucket in the sun makes really good greenWater... you can use old tank water and tank gunk as fertilizer

 

[connorlindeman]

GREEN WATER
Green water is a mass bloom of single celled algae. To culture this, put a container of dechlorinated water out in the sun and add 1 level tablespoon of lawn fertiliser for every 20 litres (5 gallons) of water. Use fresh water for freshwater species and seawater for marine species. If possible aerate or circulate the mixture. It should go green and soupy quite quickly, (usually within a couple of weeks). Then take some of the green water and put it in with the baby fishes. Enough green water should be added to the fry tank to turn it a pale green colour. You also need to keep adding green water to the fry tank to keep the green tinge in it. If the water in the rearing tank goes clear, there will not be enough algae for the fry to eat and they die.

Algae cultures can be grown indoors and regularly are in scientific labs or aquaculture facilities. You have a couple of fluorescent lights above or next to some containers of water with fertiliser in. You either add an algae starter disc, available from aquaculture supply stores (like Florida Aqua Farms) or you just leave the containers of water open to the air. Algae spores will eventually land in the water and start the cultures.

If you need to get green water quickly, you can use a clean fish sponge and wipe some green algae off the inside of an aquarium and rinse the sponge out in the culture container. Within a week the water should start to go green and soupy.

Have the light on for 24 hours a day and aerate the water and fertiliser. Use an airline without an airstone to circulate the water. Tie a small lead weight to the airline to hold it on the bottom of the container of water.

When the water goes green and soupy you start adding a liquid aquarium plant fertiliser or an iron based aquarium fertiliser to keep the culture going.

You should start a new culture regularly by making up some clean tap water and fertiliser and adding some of the green water you already have.

You can use old green water cultures to grow rotifers, daphnia & cyclops.

Make sure the green water that gets added to the fry tank has a similar temperature to the fry tank so there are no sudden temperature changes.

Replace the water you take out of the culture container with some fresh dechlorinated water.

If you put fry into a container full of green water, make sure it is aerated so the fry don't suffocate at night, and have something in the water to buffer the pH. During the day when the tub of green water gets light, it will use all the carbon dioxide (CO2) in the water and the pH will go up. At night the green water will use up all the oxygen (O2) and release CO2 and the pH will drop. Aerating the green water culture will prevent this from happening and stop or reduce pH fluctuations.

An aquarium based plant fertilizer can be used to keep the culture going after it has been running for a while. Alternatively, start a new culture every few weeks so you have several cultures going at any time. This will provide you with plenty of green water and provide a back-up should one culture crash. *NB* put a cover on the container to stop insects making it their home.

 

[TiercelR]

Spirulina powder and dry yeast. Get a water bottle and add enough dry yeast to make it appear milky. Then add the same amount of spirulina. Shake the bottle very well to mix all the powders and feed your daphnia a small amount each day. How much you need to add depends on how large your water bottle is. Keep it refrigerated and use it up within a week. Some people grind up fish flake food instead of using spirulina.

Or you can make green water the long way which is to put a jar of tank water in the window with some fertilizer and let nature do its thing.

You will probably get even more ideas if you do an online search.

Aqua67, thank you so much for all this so highly valuable information, i do appreciate it so much.

a bucket in the sun makes really good greenWater... you can use old tank water and tank gunk as fertilizer

Sgooosh, thank you so much for all this so highly valuable information, i do appreciate it so much.

GREEN WATER
Green water is a mass bloom of single celled algae. To culture this, put a container of dechlorinated water out in the sun and add 1 level tablespoon of lawn fertiliser for every 20 litres (5 gallons) of water. Use fresh water for freshwater species and seawater for marine species. If possible aerate or circulate the mixture. It should go green and soupy quite quickly, (usually within a couple of weeks). Then take some of the green water and put it in with the baby fishes. Enough green water should be added to the fry tank to turn it a pale green colour. You also need to keep adding green water to the fry tank to keep the green tinge in it. If the water in the rearing tank goes clear, there will not be enough algae for the fry to eat and they die.

Algae cultures can be grown indoors and regularly are in scientific labs or aquaculture facilities. You have a couple of fluorescent lights above or next to some containers of water with fertiliser in. You either add an algae starter disc, available from aquaculture supply stores (like Florida Aqua Farms) or you just leave the containers of water open to the air. Algae spores will eventually land in the water and start the cultures.

If you need to get green water quickly, you can use a clean fish sponge and wipe some green algae off the inside of an aquarium and rinse the sponge out in the culture container. Within a week the water should start to go green and soupy.

Have the light on for 24 hours a day and aerate the water and fertiliser. Use an airline without an airstone to circulate the water. Tie a small lead weight to the airline to hold it on the bottom of the container of water.

When the water goes green and soupy you start adding a liquid aquarium plant fertiliser or an iron based aquarium fertiliser to keep the culture going.

You should start a new culture regularly by making up some clean tap water and fertiliser and adding some of the green water you already have.

You can use old green water cultures to grow rotifers, daphnia & cyclops.

Make sure the green water that gets added to the fry tank has a similar temperature to the fry tank so there are no sudden temperature changes.

Replace the water you take out of the culture container with some fresh dechlorinated water.

If you put fry into a container full of green water, make sure it is aerated so the fry don't suffocate at night, and have something in the water to buffer the pH. During the day when the tub of green water gets light, it will use all the carbon dioxide (CO2) in the water and the pH will go up. At night the green water will use up all the oxygen (O2) and release CO2 and the pH will drop. Aerating the green water culture will prevent this from happening and stop or reduce pH fluctuations.

An aquarium based plant fertilizer can be used to keep the culture going after it has been running for a while. Alternatively, start a new culture every few weeks so you have several cultures going at any time. This will provide you with plenty of green water and provide a back-up should one culture crash. *NB* put a cover on the container to stop insects making it their home.

connorlindeman, thank you so much for all this so highly valuable information, i do appreciate it so much.

 

[GaryE]

It's winter where I am, which means less sun. But I put several jars of dechlorinated water on a windowsill, and add a tiny bit of terrestrial plant fertilizer. Then I wait.

In summer, it is very fast, but now, it can take a few weeks. You have to plan ahead. As you draw water out with a turkey baster, replace it with dechloninated. At a point, a tiny bit more fertilizer will be needed. I try to use the jars in a sequence, so while one is recharging (but never emptied because the algae takes so long to start growing) I use the others. I don't want to be dumping fresh fertilizer into my tanks.

 

[TiercelR]

It's winter where I am, which means less sun. But I put several jars of dechlorinated water on a windowsill, and add a tiny bit of terrestrial plant fertilizer. Then I wait.

In summer, it is very fast, but now, it can take a few weeks. You have to plan ahead. As you draw water out with a turkey baster, replace it with dechloninated. At a point, a tiny bit more fertilizer will be needed. I try to use the jars in a sequence, so while one is recharging (but never emptied because the algae takes so long to start growing) I use the others. I don't want to be dumping fresh fertilizer into my tanks.

GaryE, thank you so much for all this so highly valuable information, i do appreciate it so much.