When can you spend fish tokens during a turn, and can fish move the robber before the roll?

Question

Accepted Answer

Only in the trade and build phase of your turn, so fish cannot move the robber before the roll. Fish you collected this turn can be spent in that phase, but each action is paid in full and fish cannot be pooled across actions.

CATAN

When can you spend fish tokens during a turn, and can fish move the robber before the roll?