There have been a couple of references on this thread to what could be bull
sharks, a.k.a. Zambezi shark, Lake Nicaragua Shark, etc. etc.. They are
known and feared in all of the world's great rivers where the temperatures
are warm.
Thomerson has a note a bunch of years ago in Copaea (sp.) about a newspaper
article out of Alton, Illinois from the 1920s or '30s before the flood
control dams were put in. Evidentially a bull shark had actually roved that
far north in the Mississippi and gotten tangled up in the nets of commercial
fishermen.
What is the minimum temperature which bull sharks can tolerate. Then I know
where to collect. ;)
Thanks and all the best,
Scott
By the way, there is a satire pondering the idea of using them as biological
controls on the St Lawrence River at
http://www.southwestdiver.com/angolob/sharks.html
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