cjrgreen: I think these would run to prohibitions on keeping cetaceans in captivity (whether for scientific, military, or entertainment purposes) and on activities that kill cetaceans or disrupt their social units (whaling, fishing in ways that tend to trap and drown dolphins, use of high-powered sonar).
WBGhiro: I agree on the enterteinment and probably military purposes (but as i stated, all other animals should be protected against that too). But the dolphin's intelligence is what makes the study of his behaviour appealing in the first place. by outlawing the study of dolphins we will probably miss some worthwile knowledge about social evolution.
The problem with not extending the prohibition to "scientific" purposes is that many cetaceans are slaughtered in the course of what are claimed to be "scientific" hunts. The existence of the "scientific" loophole renders the entire prohibition against whaling unenforceable against countries barbarous enough to drive a factory ship through it.
I suspect legitimate marine biologists (as opposed to whalers sailing under false flag) will be on both sides of the fence, some wanting continued limited provision for captive study, others believing we can do enough good science by observing free-ranging populations.