Hummingbird Fish Finders, and Garmin GPS. The lure of the early morning outdoors perhaps seemed to them too banal, not quite promising. But now it is very promising since the advent of coordinating sonar beams. Fish arches are created as the fish moves through the transducer's cone-shaped scanning area. However, as one expert points out, arching a point target such as a fish, can cause other structures under the boat to arch, covering up depressions or holes that might be holding fish. But it is fun to use, play with, and may also lead to a better understanding of the swimming creatures. Did you know that mollusk aquaculture is carried out in coastal waters either as bottom culture or off-bottom culture? There are other aquacultures programs, too.