TL;DR: FickleRhubarb tested not moving the green bar all day on Spring 2 (two runs) at the Fish Shop, with the Training Rod, alternating Trout Soup and alternating short and long casts. Green bar is 1.3 ticks (joints) long irrespective of Trout Soup. Run 1 (summarized here) had 4 perfect catches, xp 208, level 1 on entirely long casts and run 2 (logged here) had 10-11 perfect catches, xp 418, level 2 on mostly short casts. I just ran a baseline fishing test on Y1 Spring 2 all day without playing the mini-game (no green bar movement). The results on that aren't too impressive, but I learned one good hard fact. PARAMETERS: Location: Fish Shop front door Time: Y1 Spring 2, 7:00am to 2:00am. (No training rod until 9:10 am, of course.) I made four Perfect Catches. I leveled up to 1 almost immediately but only made 208 experience for the day and fell asleep still at level 1. Trout Soup does not increase green bar length beyond Training Rod (1.3 ticks) at Level 0 and 1. So Trout Soup is only useful at that level for energy (and to save time vs. going to fetch other kinds of energy).