Thanks for the great essay on dredging, Paul!! I have heard a triangular
design has some advantages, since it can never land the "wrong" side up,
and always bites into the bottom.
        Re New England Corals, however, there are perhaps 12+ species, mostly
deep-water (60-3000+ fathoms) octocorals, which live on canyon walls,
and form complex, virtually unstudied ecosystems with spledid
biodiversity and productivity, just like their shallow-water relatives.
However, one is not likely to accidentally dredge these!
 
                                                                                                                -Ross M.