Ok, so your fish have breed, you have 5000 eggs what to do now?
Your goldfish eggs should be kept in water which shouldn't be more the 6
inches deep. In deeper water the water pressure is to much and can damage
the fry and make it hard for them to reach the surface.
Water temperature should be about 70 - 80 degrees F (20 - 25 degrees C). It
can be slightly lower or higher as well. The warmer the water, the quicker
the eggs will hatch. At about 75 degrees the eggs will hatch after 90
After 24 hours of the eggs being layed and fertalized some will become clear
and others will become white. The white eggs are unfertalized eggs and
should be removed where possible. These eggs will quickly grow fungus on
them which can spread to and kill other eggs.
Once the fry hatch they will be 'tiny stick fish' with eyes. For the next 2
days they will not eat anything because they have not yet developed a mouth
or internal organs. Instead they will absorb what is left of their yolk
sac. During this time they will be mostly motionless and suction themselves
to walls or plants or anything else they can grab ahold of.
It is not necessary to filter the water at this time, although some people
After two days the fish will fill their air bladders and start swimming
normally looking for food. In about 24 hours there will be thousands of
little hungry eyes which need to be fed.
The fry will eat anything it can fit into its mouth. Brine
shrimp is often fed to young goldfish. Shrimp eggs can be bought at
most pet shops which come with instructions on how to hatch them. They will
also eat any single celled animals in the water, paramecium,
algae and daphnia to name a few. They will also eat egg yolk which
can be prepared for them.
Some breeders start their fry out on flake food immediatly. It is difficult
to find flake food which is as rich in nutrients as live food. It is also
hard to break the flakes down into a small enough powder that the young fry
can eat it.
Feeding your fry is difficult because they are so small. You must put
enough food in the water that they can find it, but not so much that the
water goes bad. Keeping a continuous supply of live food infront of them is
always the best, but that is often not possible. It is often best to put
enough food in that it will be eaten within a few hours, then add more
again. By doing many water changes, changing 50% or more a day, you can
help keep the water fairly clean as well.
Baby goldfish will grow quickly and soon will require a lot of food.
Raising a thousand tiny fish is a lot of work and making sure they live in a
clean aquarium is also a lot of work. You will have to
cull out your fry from time to time, keeping only the best
If you have an outdoor pond it is a good idea to keep the fry in this water.
If not in the pond itself when you do water changes be sure to change the
old water with water from the pond. The pond water is full of
microorganisms which they can eat. Water changes should be done daily to
keep the fry in as clean as water as possible.
As the fish grow they will need to be given more room to swim. Although a
hundred fry can live in an icecream pail for their first week this becomes
just too crouded for them by the third week. As they get larger they can
start to be fed flake food as well. By 4 or 6 weeks they should be eating
flake food two or three times a day.