Now the reason I like the last one so much is because it is TOTALLY away from the "growth" pattern of the others. It is simple, conveys the message to what it is representing, has maturity to it, yet the fish is attractive to children, being cute.
I might put an inline on the banner and increase the size of the last S for balance, but other than that - PERFECT.
As they say in the movies... "that's a wrap"
PS. Make sure you get a worthy design fee, and being so good, register it. With the internet, I can see this being stolen.