A SIMPLE WATER SAMPLER, AND A CHAMBER FOR IN-SITU INCUBATION OF PLANKTON SAMPLES AT DISCRETE DEPTHS

1. A simple water sampler and an incubation chamber are presented. The water sampler is simpler in construction than the Ruttner sampler and other comparable devices. In addition to enclosure of water at a disc rete depth, the incubation chamber releases a radioisotope or other su bstance of experimental interest into the sample. 2. Tests of performa nce are presented, demonstrating efficiency in enclosure of water from discrete depths, and time course of mixing of a tracer into the sampl e after activation of the release mechanism.