Now that you have the main ingredients,
how do you create enough infusoria to feed
your fish fry? Here’s the recipe:
Half-fill a clear, wide-mouthed glass
container that holds approximately 6 quarts
(about 6 liters) with the starter water,
whatever the source. Glass is preferable
to plastic as it is easier to clean and will
not leach chemicals into the culture water.
Glass also makes it easier for you to observe
the progress of your culture.
Now add the organic ingredients, but
again, not too much. The organics are
important because they encourage some
bacterial growth that, in turn, feeds the
nonphotosynthesizing infusoria present in
the starter culture—the paramecia and the
rotifers. The temperature of the culture
should be maintained at approximately 82°F
( 28°C); be sure to keep the temperature
relatively stable, as fluctuations either way
can negatively affect the culture.
The pH should be somewhat alkaline,
above 7.0. The container should be placed
either under artificial light or indirect
sunlight. If you put the container in direct
sunlight, you will still develop infusoria,
©HSUSAI TFH July/Aug 2017
Rotifers range from 50 micrometers to a relatively large 2 millimeters—the smaller ones
make infusoria feedings good first foods for fry.
A close-up view of the rotifer Stephanoceros fimbriatus.