Problem with the vac and working in water is that the bucket fills with water quickly and has to be poured off often.Scientific research activity is, for the purposes of this part, an activity in furtherance of a scientific fishery investigation or study that would meet the definition of fishing under the Magnuson-Stevens Act, but for the exemption applicable to scientific research activity conducted from a scientific research vessel. The motorized vac should be legal due to the fact that there is no discharge back into the water source. The hand dredges are inexpensive but the vac is worth every dollar due to the amount of material you can gather faster, coupled with the ease of use, along with having more suction power. With the vac, the motor does all the work and all you have to do is run the nozzle over the crevices or around boulders etc. The hand dredge I built incorporated two check valves so I could pull in material on the upstroke and then expel material on the down stroke through a hose into a bucket or even directly into a sluice with the crash box adapter. Guess if you have never used a vac then the hand dredge is better than nothing. I couldn't get my gold vac out of the truck fast enough to start using it instead. After using my hand dredge for a short while this weekend for the first time,
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