Swim Speed Up
From Inkipedia, the Splatoon wiki
Swim Speed Up increases movement speed while swimming in squid form by up to 25%. Krak-On gear has a 5x chance of rolling this ability.
In-Depth Ability
This Ability also affects movement speed while under the effect of the Kraken special.
Use
Like Run Speed Up, this Ability comes in handy during the opening moments in a match when you are heading toward a Stage's center.
Gear
Swim Speed Up is the main ability of: