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Stability of vitamin B12 levels in Mankai™ along the year. “Autumn” refers to water temperatures of 22–24.5 °C and 10:20–10:50 h of light. “Winter” refers to water temperatures of 17–20 °C and 10–10:20 h of light. “Spring” refers to water temperatures of 21–24 °C and 11:30–13:30 h of light. “Summer” refers to water temperatures of 25–29 °C and 13:50–14:15 h of light. For each season, the weekly average water temperatures and daily light hours relate to the sampling date.
