The comparison of two simple protocols designed to initiate and stimulate ammonia oxidation in closed aquaculture systems

Strictly aerobic and anaerobic bacteria associated with sinking particulate matter and zooplankton fecal pellets

“…Nitrification was determined by measuring the nitnte concentration i.n flasks containing inhibitors (Perfettini & Bianchi 1990). Briefly, in flasks of 50 m1 final volume, (1) the natural nitrifying activity was determined by the increase of nitrlte in flasks witho.ut addition of substrate (NH,); (2) the potential nitrifying activity was demonstrated by the incrt'ase of nitkite in duplicates receiving 50 W M final concentration of NU,Cl.…”

Rates of nitrification and carbon uptake in the Rh�ne River plume (northwestern Mediterranean Sea)

“…The nitrite concentration in the subsamples was measured [5] for 24 h at 4 h intervals, using 10-cm pathlength cells. The nitrification rates were calculated from the exponential increase or decrease in nitrite, as described elsewhere [7,21]. In such short-term incubations, inhibition with ATU treatment was effective.…”

Startup and effects of relative water renewal rate on water quality and growth of rainbow trout (Oncorhynchus mykiss) in a unique RAS research platform

“…The startup phase of the biofilter is considered to be long, e.g. 40 days in shrimp RAS (Perfettini & Bianchi 1990), and it can be shortened by using inoculates of nitrification bacteria (Grommen et al 2002, Kuhn et al 2010. However, external bacteria load might be harmful, and the community composition of the bacterial inoculates might differ from the one of the natural RAS bacterial population, thus an alternative strategies for enhancing the startup of the nitrification process are needed.…”