Rotifer Feed Calculator

This calculator will help you to determine how much feed your culture requires to produce the number of L-type rotifers you need to harvest each day. These feed rates will produce the same biomass (food value) of S rotifers, but the rotifer numbers will be about 2.5 times higher.

The traditional technique for growing and harvesting rotifers has been to count the rotifers and feed the culture based on the count.  We recommend a very different technique–maintaining a constant harvest rate and regulating the growth of the rotifer population by regulating the amount of food you give them.  This results in more stable and predictable rotifer production.

Rotifer egg production is high for only the first 3–5 days of their 7–15 day (depending on temperature) lifespan, so for the best production it is important to harvest at least 25% of your culture each day to keep your population young and reproducing vigorously.  In a healthy culture the numbers of rotifers produced each day directly corresponds to the amount of feed you provide.  If you need more rotifers, keep the same harvest rate and simply feed more to your culture each day; feed less if you need fewer rotifers.  When you increase or decrease the feed it will take 1-3 days (depending on the magnitude of the change in feed rate) for the culture to reach a new equilibrium and stabilize production.

How many rotifers do you need to harvest each day? million
How big is your tank? liters
What is your daily harvest rate? percent

 

Number of rotifers needed in the tank million
Rotifer density per ml
Amount of Nannochloropsis 3600 OR Rotifer Diet to feed daily ml per day
Amount of ClorAm-X to add daily grams
OR  
Amount of Rotigrow Nanno to feed daily ml per day
Amount of ClorAm-X to add daily grams
OR  
Amount of RotiGrow Plus to feed daily ml per day
Amount of ClorAm-X to add daily grams
OR  
Amount of RGComplete to feed daily ml per day
Amount of ClorAm-X to add daily grams

Note: Normally no ClorAm-X will be required when feeding RGcomplete, which contains ClorAm-X. With all feeds, actual ClorAm-X demand will depend on temperature as well as other factors. These recommended dosings will be adequate in most situations, but we recommend daily ammonia testing at least until a culture routine is established that maintains consistently low ammonia levels. Always use a salicylate-based ammonia test (turns green-blue) when using ClorAm-X.