A lot of people have mentioned my improper counts -- hope you all muddles through ok. There have been a lot of helpful knitters who have suggested corrections, here is artgal702’s errata, which I’m sure will be helpful:

Rows 82-92 of the body should read as such:
82.) K55 • P, K11, P2 (K3, P2) 7 times, K11, P
83.) K55 • P, K11, M1L, P2, (K3, P2) 7 times,
M1R, K11, P
84.) K55 • P, K12, P2, (K3, P2) 7 times, K12, P
85.) K8, M1L, K39, M1R, K8 • P, K12, P2, (K3, P2) 7
times, K12, P
86.) K57 • P, K12, P2 (K3, P2) 7 times, K12, P
87.) Repeat row 86
88.) Repeat row 86
89.) K57 • P, K12, M1L, P2 (K3, P2) 7 times,
M1R, K12, P
90.) K57 • P, K13, P2, (K3, P2) 7 times, K13, P
91.) K8, M1L, K41, M1R, K8 • P, K13, P2, (K3, P2) 7
times, P2, K13, P
92.) K59 • P, K13, P2, (K3, P2) 7 times, K13, P
(in each row there’s a P2 after the 7 K3, P2’s that doesn’t make sense in the pattern.)

Row 121 of the body should read as follows:
121.) K47 • K24, SSK, K, K2tog, K24

Row 157 of the body should read as:
157.) SSK, K27, K2tog • K15, SSK, K, K2tog, K15

Row 22 of the fins needs to have ANY TWO of the M1 stitches removed to add up in the rest of the pattern

The top fin where you leave 7 on a holder is a bit confusing, but shouldn’t be too hard.