AtmosphericEmissionsfromOxidation Ponds

Frozen ponds

Frozen ponds: production and storage of methane during the Arctic winter in a lowland tundra landscape in northern Siberia, Lena River Delta M. Langer, S. Westermann, K. M. Walter Anthony, K. Wischnewski, and J. Boike Alfred-Wegener-Institut Helmholtz-Zentrum für Polarund Meeresforschung, Periglacial Research Section, Potsdam, Germany University of Oslo, Department of Geography, Oslo, Norway Ce...

Limnology of Tundra Ponds

Blue Crab Aquaculture in Ponds

North Carolina’s Blue Crab Fishery As North Carolina’s number one fishery, blue crabs, Callinectes sapidus, are part of an important industry for numerous coastal communities. The fishery supports commercial fishermen, dealers, gear providers and processors throughout the year. Fluctuations in landings have led to concerns over crab populations and the livelihood of the commercial crabbers they...

Managing Ammonia in Fish Ponds

Ammonia in water is either unionized ammonia (NH3) or the ammonium ion (NH4). The techniques used to measure ammonia provide a value that is the sum of both forms. The value is reported as “total ammonia” or simply “ammonia.” (In this publication, “ammonia” refers to the sum of both forms; the specific forms will be referred to as appropriate.) The relative proportion of the two forms present i...

Nitrification-denitrification in waste stabilisation ponds: a mechanism for permanent nitrogen removal in maturation ponds.

A pilot-scale primary maturation pond was spiked with (15)N-labelled ammonia ((15)NH(4)Cl) and (15)N-labelled nitrite (Na(15)NO(2)), in order to improve current understanding of the dynamics of inorganic nitrogen transformations and removal in WSP systems. Stable isotope analysis of delta(15)N showed that nitrification could be considered as an intermediate step in WSP, which is masked by simul...