On one front this film does exactly what it says on the tin, its a creature feature boasting no more than soft porn and mindless killing via nasty sharp toothed fish. If you enjoy this type of film then you will possibly enjoy this 'comedy' horror, there is nothing to explain as its entirely obvious all the way through.
On the other front you could also look at this as yet another completely pointless waste of money and time which offers absolutely zilch originality in any department.
Personally I enjoy creature features but this is pretty much bottom of the barrel stuff that wasn't needed and drags down the genre's good image. Its completely a rehash/rerun of the first film (almost identical for gods sake) that offers terrible effects both real and cgi coupled with lame vanilla 'porn' which only teenagers would find sexy.
Comedy horror? no, not at tall, not even remotely amusing. Although it does amuse me how the makers couldn't decide what they wanted it to be. It does start off as a reasonably sensible creature horror but totally deteriorates into a spoof towards the end, I half expected Leslie Nielsen to pop up, quite bizarre frankly.
Yes it delivers more pointless flesh eating goldfish which some may want but ultimately the film is so badly made, so trashy with dreadful...everything! Quite simply if you wanna see tits n ass just watch some porn, why bother watching this nonsense?
The only half decent thing was Hasselhoff enjoying a laugh at his own expense. The 'Baywatch' spoofing could easily be a fun film on its own, just drop the shitty piranha plot and you could have a winner.