A hat in Time
The Fish Hat is one of the 37 hats in the book "A Hat in Time"
"A Hat in Time is brimming with 37 hats to knit and crochet, ranging from the simple to the complex, the traditional to the hip, the cozy to the cute. The book celebrates 90 years of Save the Children's work for children and is sold in aid of the independent international children's charity." Available in paperback of E-book (pdf) at Lulu.com