As I understand it, there are naturally occuring ocean currents (eg , the gulf stream) which are richer in sea life than quieter regions. And the ships relied on such currents in the days when sail power was the only form of power at sea. That's why "the sharks follow the same route as the slaving ships" .
"There was a black academic"
No, this was a black Congressman, Rep Major Owens.
"There was a black academic who stated that sharks to this day follow the routes of the slave ships because so many dead Africans were thrown overboard. Supposedly, they remember and are waiting for more"
That was a Congressman, name escapes me at the moment, not an academic.
I consider both to be of about the same low mentality.