ive seen several in the merrimack, they are usually either at the mouth or right in the channel by bridge marina. You know it when you see one, they jump straight out of the water and usually go back in the same way. Most i've seen are in the 3-4' range. cool to see. One particular day at the mouth in a 1-2 hour span i saw 4-5 jump at the mouth, i'm sure many others saw it too, there was a ton of boats that day.
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