My Ravelry store is closed. You can find all of my old and new patterns on my own website: www.kulabradesign.com

The PDF has three different fishies charts for stranded knitting. The width is adjustable (from 66sts around and up). The length is fixed - you can’t really cut the fish in half. However, you can vary the length of toes to make the socks shorter. You can also start toe decreases right after the last fin has been completed (I did that on black socks; decreased in every round for size 6).
The pattern contains charts only, and is intended for knitters familiar with basic sock construction. You need to know how to knit heels and toes (any method will do).

Other fishies patterns:

Coral Reef Mittens,
Fishies, Topical Fish, Fishies, and Freshwater Fish Mittens.