Abstract:

A two stage turbidostat was developed according to Boraas and Bennet (1988), but with highly improved turbidity sensors. The first stage was an algal turbidostat where algal density was regulated by turbidity measurements. Algal density was also held constant in the second stage (rotifer production) according to turbidity measurements. Additionally, the growth rates were monitored. The regulation system allowed an effective on-line process control. Initially, the production of rotifers in long-time studies was variable. However, after further improvements of the turbidity measurement, fluctuations in the rotifer turbidostat decreased significantly.
(Inst. Freshwater Ecol. And Inland Fisheries, Dept. Lowland Rivers and Shallow Lakes, Muggelseedamm 260, D-12562 Berlin, Germany) home