Traits

Requires: Sphirix Tail

Continuous tail: Swims at slow speed but highly manoeuvrable, enabling access into crevices and caves (e.g. cobbler).
Source

Requires: Sphirix Tail

Lunate tail: Very fast fish, able to maintain high speeds for long periods of time, but a lack of surface area means they can't stop or turn easily or swim backwards (e.g. tuna).
Source

Requires: Sphirix Tail

Forked tail: Cruising fish that swim continuously at very fast rate (e.g. tailor and Australian herring). Extra fin surface provides more manoeuvrability than fish with a lunate tail.
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Requires: Sphirix Tail

Truncate tail: Cruises at intermediate speeds, with increased manoeuvrability due to even larger surface area (e.g. mangrove jack). Also able to accelerate quickly when needed. 
Source

Requires: Sphirix Tail

Rounded tail: Swims at intermediate speeds, with greater manoeuvrability, and able to accelerate quickly for short periods (e.g. Estuary cod).
Source

The grifix has the same tail shape as the sphirix. Occurs predominantly to grifix that have a strong connection with their sphirix. 

Doesn't have to be lizard tail. The Image is just an example.