Something else I just noticed in the article:
"Wild hybrids are usually hard to find, so detecting hybrids and their offspring is extraordinary," said Jennifer Ovenden from the Queensland Department of Primary Industries and Fisheries.
Now, I'll admit it's been a while since I was in 10th grade biology class, but I seem to recall, natural hybrids - a mule (the offspring of a horse and a jackass) being the commonly used example - were generally STERILE. How is it, if these really are two distinct and separate species of shark, that the HYBRIDS - these Black-tip Mule Sharks, for want of a better name - are capable of producing OFFSPRING???

Sounds to me like maybe somebody created two separate classifications of the same species, so as to under-report the population and thus get them listed as protected animals, and now mother nature is coming along and tossing her big-assed wrench into the scam.