Are there any good portable fish finders on the market?

I take my son fishing to a couple of lakes and, because I don’t own a boat, I always rent one for the day.
Do you know if there are portable fish finders that can readily attach to a rented 4 person aluminum boat?
If so, where can I buy one.
Any help will be appreciated.

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Fish industry hoping to revive market

Fish industry hoping to revive market
BOSTON – It’s been a worry-free couple of decades for the Acadian redfish. The reddish-orange schooling fish have been worth so little to fishermen that they’ve rarely had to flee from the tightening mesh of a net. But life for the redfish may soon be changing – if the fishing industry can get people to bite. Redfish is one of the few populations of New England groundfish considered completely …

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