Stardew Fishing: A Minigame, Not a Content Pack
Stardew Fishing is a mod that recreates the fishing minigame from Stardew Valley inside Minecraft, and it is best understood as a minigame overhaul rather than a bundle of new biomes, dimensions, or questlines. Instead of adding a pile of unrelated content, it changes how catching a fish feels: you work an active bar against a moving target, and the fish you pull up are drawn from a themed roster tied to the places you already fish.
What the Mod Actually Changes
The core of the mod is the minigame itself. Fishing becomes an active test of timing and control rather than a single click and a wait. Because the challenge lives in that bar, the mod's items are built around making the bar easier to manage or making the fish around it more rewarding. This is why the guide's subject is the minigame and not a content pack: everything here feeds back into the act of catching something.
The Fish
The fish roster is organized by where you cast your line, which means exploring different biomes pays off with different catches.
Blazing Oarfish and 
Cyclops Mahimahi are found in warm oceans.
Goliath Grouper and 
Storm Tarpon are found in normal and cold oceans.
Chromatic Arapaima and 
Vampire Payara are found in jungle lakes and rivers.
Crystalline Snakehead and 
Demon Gar are found in rivers.
Golden Snook and 
Sabre-toothed Tigerfish are found in desert, savanna, and badlands lakes and rivers.
If you want a specific fish, the biome decides where you stand, not the bait or the rod.
Bobbers
Bobbers are the mod's answer to the difficulty of the minigame. Each one solves a different problem, so the right choice depends on what keeps costing you fish.
Cork Bobber slightly increases the size of your fishing bar, which makes the whole minigame more forgiving.
Trap Bobber causes fish to escape slower when you aren't reeling them in, giving you room to recover from a bad moment.
Treasure Bobber keeps fish from escaping while you collect treasures, and it also slightly increases your chance of finding treasures.
Sonar Bobber shows you what fish is on the line before you catch it, so you know whether it is worth the effort.
Quality Bobber greatly increases the experience you gain from fishing.
Crafting the Gear
The mod adds six crafting recipes. The bobbers and the display item are the ones worth planning around, since each needs a small set of specific materials.
- Cork Bobber: four stripped logs (any type in the stripped logs tag) plus two
Barrel. 
Fish Display: four 
Gold Nugget plus four 
Oak Planks.- Quality Bobber: two
Diamond plus one 
Prismarine Crystals and one 
Prismarine Shard. - Sonar Bobber: five
Copper Ingot plus one 
Amethyst Shard and one 
Observer. - Trap Bobber: two
Iron Nugget plus five 
Iron Ingot, one 
Tripwire Hook, and one 
Slimeball. - Treasure Bobber: one
Block of Redstone plus two 
Gold Ingot, one Iron Ingot, and one Tripwire Hook.
Several of these recipes lean on materials you likely already have from mining and basic crafting, while the Quality Bobber and Sonar Bobber push you toward diamonds, prismarine, and an Observer.
Showing Off Your Catch
Catching a rare fish is only half the point if it sits in a chest forever. The Fish Display lets you right click to put your prized fish on display, turning a good catch into something you and anyone visiting your base can actually see. Given how biome-specific the roster is, a display is a natural way to show which regions you have fished.
Putting It Together
Treat Stardew Fishing as a change to the fishing loop first and a collection of fish second. Pick a biome that matches the fish you are after, craft the bobber that patches your weakest moment in the minigame, and use the Fish Display when you finally land the one you wanted. The minigame is the content; the fish and the gear exist to give it stakes.