Bioflocs were sampled in situ using Imhoff cone
Zooplankton samples were measured for the total settled volume of all zooplankton collected by pouring each sample into an Imhoff cone
and measuring the volume of zooplankton which had settled to the bottom of the cone overnight.
The veligers were allowed to settle in the Imhoff cone
for a minimum of 24 h.
Selected samples are analyzed for Total Suspended Solids (TSS), and a few Imhoff cone
determinations of settleable solids have been made.
Imhoff Cone determination of sediment in irrigated runoff.
Sediment loss from each furrow was measured frequently throughout the irrigation event using Imhoff cones.
Between 1,050-1,200 embryos were placed into each Imhoff cone, for a total of 10 cones (5 for each diet treatment) containing 1,000 mL of 1 [micro]m millipore-filtered, UV sterilized sea water with a continuous supply of about 50 small bubbles of air per minute (George et al.
The present work shows that by using the Imhoff cones, it is possible to carry out protein and carbohydrate analyses with the appropriate number of replicas without having to false huge amounts of larvae.
The software requires a calibration function, which converts settled sediment volume observed in one-liter Imhoff cone samples to weight of sediment per liter of runoff (12).
FRWSED can compute separate Imhoff cone calibration equations for different furrow groups, or treatments, and use them to compute erosion losses.
The spreadsheet, unlike FRWSED, does not calculate Imhoff cone calibrations.
Necessary measurements can be made using a stop watch, a 3.78-L (1-gal) bucket, a one-liter Imhoff cone, and a flume.