Trial of stable outdoor mass culture of <I>Chaetoceros calcitrans</I>

Sasaki Tadashi

doi:10.11233/aquaculturesci.69.55

To clarify the stability of Chaetoceros calcitrans in outdoor mass cultivation, culture trials using 100 l, 500 l and 5 kl tanks were conducted outdoors from spring to fall, with C. neogracile as the control group for comparison. In addition, experiments were conducted to clarify the use of commercially available C. calcitrans products as a starter culture and the effectiveness of culturing C. calcitrans with a shade curtain in summer. In spring, which is an optimal season for cultivation, the maximum density of C. calcitrans cells reached approximately 6 million cells/ml in the 100 l and 500 l tanks. Furthermore, the results demonstrated that C. calcitrans can be stably cultured like C. neogracile, although the maximum cell density was slightly inferior to that of C. neogracile. The results also confirmed that C. calcitrans can be efficiently cultured as a starter culture using commercially available products. The use of a shade curtain to reduce the water temperature in summer was also found effective for the stable culture of feed algae, suggesting that even heat-sensitive strains such as C. calcitrans can be cultured during summer.

Trial of stable outdoor mass culture of <I>Chaetoceros calcitrans</I>

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