UMT MOOC: Ornamental Fish Culture - Topic 7: Seed Production - Factors to be Considered for Feeding - Zooplankton : Infosuria & Rotifier

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Previously we discussed about Phytoplankton, which is a microscopic (hard to see with naked eyes) plant drifter organisms which obtains its energy through Photosynthesis. Meanwhile, Zooplankton is animal drifter organisms which can be microscopic or large (e.g. Jelly Fish). Zooplankton consumes Phytoplankton and end up as crucial food source for fishes. The video below will show a quick summary of both planktons. The discussion of this and following posts is to look into different types of Zooplankton which are crucial as live feed for ornamental fishes.


Infosuria
This is a general collective term for microorganisms or aquatic creatures in freshwater ponds. Infosuria is a good initial live feed for newly hatched fries until 4 to 5 days and can served as supplement food source after day 3 in combination with other live feed. Culturing Infosuria is straightforward, just soak vegetation in aged water (aquarium water is the best) in a jar and wait a few days for the cloudy water to turn clear. You should see some white speck with your naked eyes. The culture is ready for harvesting and fed to the larvae or fry.


Rotifier
This is aquatic organism which have rotating wheel-like structure. Rotifier is commonly used and mass cultured as live feed in aquaculture. This organism is a good food source for larvae and fry as it's easily digestible, slow moving, small, and fast reproduction. Since its life span is roughly 3 to 4 days, it's a cultured and harvested in most fish farm as good protein source.


If you've watch both videos above, you will notice that maintaining a live feed culture like Infosuria and Rotifier take quite some time and effort, even though culturing Infosuria is easier. That is why some Betta sp. breeder prefer to use Daphnia or common water fleas as live feed.

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