Large-scale rearing of Atlantic halibut, Hippoglossus hippoglossus L., yolk sac larvae: effects of flow rate on growth, survival and accumulation of bacteria
1998
Opstad, I. | Bergh, O. | Skiftesvik, A.B.
The role of flow rate in large-volume production units (2800 L silos) for Atlantic halibut, Hippoglossus hippoglossus L., larvae was studied. Correlations between flow rate, bacterial numbers (a measure of water quality), the larval growth and development rates, and mortality were assessed. The experiment included a total of six silos, two each at three different flow rates. Flow rate and mortality were positively correlated: the number of dead larvae on day 30 was highest (i.e. 2200 and 2000) in the silos with highest flow rate (8 L min-1) and lowest (i.e. 1300 and 1200) in the silos with the lowest flow rate (2 L min-1). Larval weight was negatively correlated with flow rate: on day 30, the mean dry weight was 968 micrograms in the silo with the lowest flow rate and 820 micrograms in the silo with highest flow rate. Yolk sac utilization efficiency was 92% in the silo with the lowest flow rate and 72% in the silo with the highest flow rate. The number of bacteria were highest (2.7-10(6) mL-1) in the incubators with the lowest flow rate.
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