Fishing
Fishing is the core of the game. As a result, there are many custom features that have been added in relation to fishing.
Fishing Minigame
Tutorial
Tension Bar
The blue bar below represents how the fish is fighting. Higher rarity fish will pull harder, thus making them more difficult to catch. If this bar reaches the end on either side, the line will snap and the fish will be lost. This bar is unaffected by the size of the fish.
Progress
The green bar above represents how close you are to catching the fish. Think of this bar like the health meter of the fish. Once you get this bar to 100%, the fish is caught. The weight of a fish directly affects how much progress is needed to reel. This bar is affected by natures and Fishing Stats, namely reel speed and line strength.
Fish Natures
Fish natures affect the behavior of the minigame, with some making it easier or more difficult.
Nature Effect Calm Slightly easier Docile Fairly easier Relaxed Much easier Sassy Slightly harder Brave Fairly harder Hardy Much harder Hasty Rapid line, less frequent Impish Slow line, more frequent Jolly Stays closer to middle Lonely Stays away from middle Quirky Slower progress Timid Faster progress
Fish Rarities
Base chances for fish rarities, these can be increased with higher Luck.
Rarity Odds 
55% 
30% 
10% 
4% 
1%
Fish Sizes
Fish have different sizes that affect their sell price and XP. You can increase the chance for bigger fish with Scale. When the size tier of a fish is generated, it will then generate a length from within that tier's range for the specific fish. The weight is then determined from the neighborhood of that length. After this, any size bonuses from lures, armor rolls, or location rolls are added together and multiply the generated weight and length.
These are the base odds for each size tier:
Size Odds Baby 20% Juvenile 40% Adult 30% Large 7% Large+ 2.98% Gigantic 0.02%
It's important to note that in-game, Large and Large+ are indistinguishable from each other; they will both be displayed as Large. However, they have separate ranges of length, with Large+ having a considerably wider spread.