Swimmy by Leo Lionni.  It has a "work together" theme. 

 Big Al by Andrew Clements.  It has a theme of making friends with people regardless of their looks.

 
McElligot?Ts Pool By Dr. Seuss
 

A Fish is a Fish by Leo Lionni
 

House for Hermit Crab By Eric Carle
 

Arty the Smarty
 

Big Al and Shrimpy (sequel to Big Al)
 

Five Silly Fishermen by Roberta Edwards
 

Fish Wish by Bob Barner

 a FISh motivational video for staff.
It's called, "Fish! Catch the Energy & Release the Potential" by Stephen C. Lundin, Ph.D., Harry Paul and John Christensen.  It was a Wall Street Journal Business Bestseller.  It was presented to our staff at the beginning of the last school year, and it was very enjoyable and motivating to the staff.  There is a video that is available also that is a companion to the book.  The book is published by Hyperion and the ISBN is 0-7868-6602-0.