Control of conchospore formation and release

Conchospore formation and release usually requires a particular combination of conditions such as nutrient availability, temperature, photoperiod and photon flux density, depending on the species. Conchospore release is promoted by stirring, using compressed air bubbling, or by treating cultures with lower tempera ture seawater (18 °C from 20-22 °C). For the latter treatment, conchocelis bearing shells are transferred to lower temperature seawater tanks 5-7 days before seeding. Replacing the seawater in conchocelis culture tanks and adding vitamin B 12 can also promote con chospore release. To inhibit conchospore release, conchocelis tanks may be covered by black vinyl sheets and the culture seawater maintained calm with little, if any, aeration.

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