The life cycle is normally 6-8 days; L-strain rotifers are most prolific with a salinity at "Single vessel culture 22ppt and at optimal temperatures of 25 setups with pH, degrees Celsius. Only light aeration is normally applied to avoid fast water movement that ammonia control and may strip the daughter cells off the adult rotifers. biological filtration Batch culturing rotifers in four to can operate within a five vessels has proved a straightforward protocol and allows a culture to develop compact area, yield over four to five days with one vessel harvested each day. Normally two thirds high rotifer densities and of a mature culture is harvested for feedallow daily harvesting" ing and one third retained to establish a new culture. This culture setup limits water quality becoming an issue, the vessels are cleaned between uses, and any background build-up in ciliate populations that may compromise the rotifers can be kept in check. ZM live adult rotifer and daughter cell Single vessel culture setups with pH, ammonia control and biological filtration can operate within a compact area, yield high be at risk if the culture does crash and need from microalgae plates that can be stored lture | 2015 Hatchery Ad Campaign | Theme: Ad-1 Conal True | Design: A | Version: 1 rotifer densities and allow daily harvesting. replacing. in the fridge and shipped internationally by ernationalCareful Aquafeed | Size: Half Page | Dimensions: 190mm X 132mm management of single vessel cultures courier. Normally Nannochloropsis and/or is still required to avoid ciliate population build Food options for rotifers: Tetraselmis is used for a day-to-day rotifer up and water parameters being exceeded Live microalgae have traditionally been feed and Isochrysis used as a DHA enrichthrough laziness. This setup will represent ‘all cultured for feeding and enriching rotifer ment just prior to using the rotifers as a larval your eggs in one basket’ so your hatchery will cultures. Starter cultures can be established feed. Microalgae culture technique remains
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March-April 2015 | INTERNATIONAL AQUAFEED | 31
Published on Mar 16, 2015