*sigh* the sad thing is I could actually see that working...
In a comedy movie perhaps.
Anyway, please don't get me wrong, I'm not saying that OUR dolphins are as smart as we are. But I still say that simply getting caught in nets on a regular basis shouldn't be the measure.
It is actually a good measure, because the net is a trap; a simple, obvious trap. It is obvious because it is in plain sight, and because it is always accompanied by a massive foreign object on the surface (the boat).
We actually have two levels of stupidity going on here. First, you have the dolphins swimming into the plainly visible trap, but more importantly, you also have the dolphins' inability to "spread the word" among themselves about these obvious traps so that others can avoid them.
That second level of stupidity is the most damning BTW, because it indicates that they can't comprehend dangers that their instincts don't warn them of (i.e., artificially constructed dangers; i.e., traps), much less communicate those dangers to others. That indicates that there is little to no critical thinking going on in their brains, and indicates that their communications are simplistic at best.
As for extra-terrestrial 'dolphins' why not? We've only seen one example of evolution on our world. Maybe instead of oposable(sp?) thumbs, dolphins of another world evolved some sort of telekinesis to manipulate the world around them on an equal, if not better level then we do ourselves.
In science-fiction that would be fine (I said as much in an earlier post). However, ordinary earth dolphins as crew members is a ridiculous idea; just as the premise for
Star Trek IV: The Voyage Home was ridiculous (though an entertaining movie nonetheless).