As the name implies, this pattern looks like little fish tails in a chevron.
You will need:
Yarn of your choice
Knitting needles to suit your yarn
C/on cast on
C/off cast off
M1 Make a new stitch by wrapping your yarn around your needle
SK2P slip 1, knit 2 together, pass slip stitch over the knit 2 together
C/on a number of stitches divisible by 10
Row1: (M1; K3; SK2P; K3; M1; K1) to end
Row 2 and all even rows: Purl
Row 3: (K1; M1; K2; SK2P; K2; M1; K2) to end
Row 5: (K2; M1; K1; SK2P; K1; M1; K3) to end
Row 7: (K3; M1; SK2P; M1; K4) to end
These 7 rows make the pattern, knit until your work reaches the desired length.