Just Enough Fishing (JEF)
This mod adds detailed fishing information to the JEI (Just Enough Items) interface. To view all available fishing loot, press the JEI usage key (default 'U') on a fishing rod. For information about a specific obtainable item through fishing, use the recipe view key (default 'R') on any item that can be fished up.
If you have Aquaculture 2 installed, the viewing functionality also works with iron, gold, diamond, and neptunium fishing rods. Vanilla Minecraft loot is sorted by item types, while Aquaculture 2 fish are organized by their respective biomes.
The mod additionally displays useful tooltips when hovering over certain fishable items.
Main features
Shows various categories of fishing loot

Hovering over items in the interface displays additional information

Supports Aquaculture 2 with biome categorization
