LaMotte BOTTOM SAMPLING DREDGE 1097 - Manual (Page 3)

3. When the dredge contacts the bottom, release tension on the
retrieving line to release the trigger mechanism. Pull up with a
smooth, steady, hand-over-hand action to close the dredge jaws and
raise the dredge until it is above the water surface. Hold the dredge by
the retrieving line or by the middle of the bridle until you are ready to
place the contents of the dredge into a collecting container. A white
enameled metal or plastic pan provides an excellent receptacle for
examining the sample.
4. Pull arms apart to open dredge and release contents into collecting
container.