Rotifer Cultures: Continuous Rotifer Culture and Production
Rotifer Cultures: Continuous Rotifer Culture and Production
There are two popular methods of culturing rotifers—continuous culturing and batch culturing. Each method has its own pros and cons, but the next two posts should help you decide which method is right for you. The focus of this article is to describe the process of continuously culturing rotifers and identify some of the advantages and disadvantages of this method.
Rotifer Continuous Cultures
Culturing rotifers with a continuous process is analogous to the way we maintain our reef tanks. With a continuous system, your goal is to create a stable habitat for the rotifers to thrive in. Like the inhabitants of your display tank the rotifers need clean saltwater, food, oxygen and light. Provide them with a suitable environment, and the rotifers take care of the rest. However, unlike the fish and coral in your reef tank, a healthy rotifer population will double almost every day. Left unchecked, twice as much food and oxygen would be needed, and twice as much waste would be produced, every day, spiraling out of control until the culture eventually crashed. In order to keep the culture from crashing, you need to perform maintenance, almost daily. You will need to harvest enough rotifers to keep the population stable, perform regular partial water changes and feed them.
Since the focus of this methodology is on maintaining a stable, reproductive population, you can transfer some of the knowledge you gained in creating a stable reef aquarium. For example, with increased volume comes increased opportunity for stability—larger culture volumes, in general, will be more stable than smaller culture volumes. The larger volume of water creates a greater margin for error, thus giving you a little slack. The key is to estimate your demand—how many rotifers will you need? How large of a culture can you reasonably maintain? How much space are you looking to devote? And establish a culture that suits your individual needs.
As with any decision in life, the decision to culture rotifers continuously instead of as a series of batch cultures has advantages and disadvantages, that you should consider.
Advantages of Continuous Rotifer Cultures
- Rotifers are available for harvest and use every day
- Small equipment footprint—all your equipment can potentially fit in a compact area since you will primarily be culturing in only one or two vessels
- Relatively larger volumes of cultures have the potential to be more stable and be insulated against small swings in water parameters
- You will eventually develop a fast, streamlined process to perform the maintenance duties, since you will have to keep up with maintenance every day
Disadvantages of Continuous Rotifer Cultures
- Continuous cultures run at lower densities than batch cultures—as a result, you produce fewer rotifers per Liter of culture media
- Crashing—continuous cultures may crash from time to time—if you don’t have a back-up (redundant) culture running you may have to start over from scratch
- Continuous rotifer cultures require continuous maintenance. The work-load is spread out, since you will perform a little bit of work every day, but you may have culture crashes if you miss too many days in a row.
Further Reading:
For more information about culturing Rotifers, check out these books:
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