While collecting the water samples
Irrespective of methods
Surface water samples are collected by
The plankton are then concentrated
It is best to sample at particular time each day
The sampling bottles or water samplers with closing mechanisms are commonly used
for obtaining samples from the desired depths.
dipping a well-rinsed bucket or bottle over the side of the boat, let it fill half with water and bring it back into the boat
between 8.30 and 10.00 a.m. is the preferred time
samples should be preserved soon after collection and where possible, live samples should also be examined
there should be minimum disturbance of water to prevent avoidance reaction by plankton
by allowing them to settle, centrifuging or fine filtration
