Extraction of veligers from the pot scrubber sampler:
To extract the veligers from the pad, hold each pad over a collecting vessel and wash it with a stream of pressurized tap water. Rinse each pad three times for approximately 30 sec per rinse. Filter the rinse water twice, using a 63-µm mesh sieve. After extraction, examine both the scouring pad and the sample under a dissecting microscope in the same manner described for general qualitative analysis (see Veliger Analysis Techniques.
Extraction of mussels from the bridal veil cylinder sampler:
Remove filamentous netting from cylinder housing. Place netting in large bucket, rinse thoroughly until netting is clean. Filter rinse water through a 63-µm mesh sieve. The samples can be quantified (number per square meter). Under the microscope, measure the size of the nylon cylinders forming a single mesh. Calculate surface area of the four cylinders; count the number of mesh squares in the material. This provides the number of veligers/square meter. Alternately, carefully cut the material in strips to fit better under the dissection scope.