Investigation of bacterial diversity and pathogen abundances in gibel carp (Carassius auratus gibelio) ponds during a cyprinid herpesvirus 2 outbreak.

Furthermore, populations of Clostridium and Thiobacillus decreased slightly in the sediment of the SY pond in July, whereas these genera exhibited an increasing trend in the DF pond in this period.

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The concentrations of NH 4 + ‐N and NO 3 − ‐N in the SY pond exhibited a decreasing trend, whereas the NO 2 − ‐N concentration increased to a dangerously high level, as 0.1 mg/L is the upper limit for NO 2 − ‐N levels in breeding ponds (Svobodová et al., 1993 ).

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