Get a portable aerator system, that is a must. There is the kind that pumps the water thru a bilge pump and sprays the water thru an aerator head.
Unfortunately, the herring lose their scales easily and this will clog the filter, so you need to be vigilant in cleaning it out. Aerators that pump air thru an aerating stone will avoid this problem. A couple of these that run on D batteries and a 48 quart cooler will keep the herring happy for short runs, I dunno about 25 miles, tho.
Ordinary Saltine crackers crushed up and thrown in the tank will keep the foam down.
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