I really am convinced that Antonio Margheriti is a good director, period. "Killer Fish" is an average, but decent action/disaster/thriller with just a few horror elements. Some might say this is a "Piranha" rip-off, but it's not. Because only in the second half of the movie we get to see some piranha action. And even that isn't much. It's more their constant being there that's causing the threatening atmosphere. This is as much a crime movie as it is a disaster movie, as it is a killer-fish movie. And I simply loved the great miniature effects when the dam broke. But what struck me most, was some of the very well-written and catchy dialogue. One guy says to Karen Black: "There I was thinking you've got some German blood in you...". Karen Black denies this by responding "Uh-uh... I WIN my wars.". Or the bad guy saying "Sometimes an unloaded gun is more effective than a loaded one." (you have to see that quote in the context of the scene). And there's much more good stuff like that coming from all characters. Lee Majors is in it too, and something hit me when I saw him in this film... If George Clooney would have been big in the 70's, he would have been Lee Majors! Surprisingly this flick was a bit less silly than "Tentacoli" (which coincidentally I saw a week before, or so), so I say "Killerfish" is a good, average and watchable film. A typical Margheriti cocktail, actually.