Apparently, this fish is spectacular as a food fish. Many chefs have cooked it and found it to be extremely tasty and usable. As far as ugly goes, most humans think any fish with teeth is ugly, and probably vice versa.
From the beginning of time, species have been trumping each other, that is the name of the game. I am afraid it is a losing battle to try to save the less evolutionarily advanced species when conditions are harsh. The world of nature does not work that way. We really cannot choose who will be the fittest and the strongest.
If it is any consolation, there are a number of species, including those cute, loveable dolphins, that are supposed to have evolved from the sea to the land, and then back to the sea again. Even humans were supposedly at some point part of this process of evolving from water beings to land beings (although much much much much much farther back in our history). These supposed frankenfish are said to only be able to "writhe across land" when they are young. So, once they get big, they have to stay put in their youth inspired adventurous waters.
We are changing our world at a rapid rate, and yes, it is US who are the true Frankensteins doing it. If you want to go back to the dark ages when most babies died of disease or birth, when people had to actually toil their limited lifetimes away, and we had hardly any intellectual or exploratory pursuits, then yeah, go call this poor enterprising fish ugly and unworthy of setting fin to your soil that was claimed through the same drive that brings this fish to our realm.
So, he is a worthy opponent, and he is very tasty on the bbq. Give him a little respect, oh evil, vicious, conniving, sharp-toothed, and scary humans.