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My friends that live on the coast do and they say it has improved their productivity.
They also give kelp to their cat, dog, horse and cow
( powdered form ? ) and those critters are never sick.
The dog is 15, the horse 25 and the cow is 16 or 17.
There is a fish emulsion in liquid form that comes out of Gloucester Mass that they rave about too for their tropical indoor plants and their outdoor big flowering plants.
Can't rememeber the name of it but it has gotten alot of "fertilizer" awards and attention over the years. All natural--FRESH--off the boat--fish emulsion. Might have kelp in it too. Comes in small bottles and 5 gallon buckets too.
Hope I am saying this right.... emulsion.