Whisperfrost Frontiers
Fish in Zone 3 would be Arctic & Sub-Zero Extremophiles (fish adapted to freezing temperatures, high oxygen levels, and waters that are often trapped under thick layers of ice or glacial runoff).
Note
Arctic Extremophiles - Aquatic environments where fish survive in temperatures ranging from -2°C to 10°C.
Real word example
Angler’s Almanac concepts
Zone 3 cave
Colours
Above ground
The colours should reflect “Ice,” “Steel,” and “Winter Sky.”
#A2D2FF
#BDE0FE
#FFAFCC
#00B4D8
#CAF0F8
Below ground
The colours should feel Deep Cold and Bioluminescent.
#03045E
#023E8A
#0077B6
#00B4D8
#90E0EF