OT
The 19,000+ non-shark pings...stripers, cod and tuna?
(although it seems rather skinny water for tuna)
Since the pings come from the acoustic tags, Biologists will place them on many species including stripers,cod,tuna different shark species etc. even on horseshoe crabs.
Years ago in Plymouth Mass. a biologist friend did a long term study and would catch sandtiger sharks flip them up side down ,cut them open and place an acoustic device inside, and stitch the cut closed and release the shark.
In the Carolinas he would get regular ping reports from biologists there,, and realized the hydrophones along the east coast between Massachusetts and the Carolinas were not reporting ping information because the biologists were only interested in their own species study. They couldn't care less about somebody else's study.
When he got involved with the white shark tagging, he noticed the same thing-unreported white shark pings. He pleasantly and diplomatically, got many of the biologists from Canada to Florida to report the white shark pings on their hydrophones.
So he has to deal with 2 species-white sharks, and other biologists. - Tom