Fishing is a Barbarian skill found in World 2 through the left portal in town.
Medium fish are caught at the big fishing spots last in the fishing areas. Small Fish are caught in all the small ones.
The first Fishing area contains a Fishing Rack, 2 Fishing spots, a whale named Whattso that gives a couple of Fishing-related quests and a portal to the next Fishing area (requires level 15 Fishing).
Simply click on the fish you can see swimming in the water and your character will begin fishing. If you are fishing actively, when your character reels in a fish it will fly up and bash you in the head, causing damage to your character. Each type of fish requires a certain amount of defense to endure. If your character has enough defense, no damage will be taken.
For example, my fisherman has 26 defense and takes 25 points of damage when hit with a Hermit Can. If you are active fishing and have low defense, make sure to equip food. Fishing does no damage to your character when AFK.
Efficiency
Efficiency works a little different here than in other skills. Besides increasing the amount of fish you get and decreasing your catch time (up to around 5-6k efficiency), Efficiency also affects which fish you get, as it relates to the "depth" at which each fish can be caught.
All 4 small fish can be caught in any of the first five fishing spots (first and second fishing zones).
All 4 medium fish can be caught in any of the final three fishing spots (third fishing zone).
See how I said chance to catch? That's because when you have enough efficiency for the next fish, your percentage for the fish before gets reduced and added to the next.
Another example: My fisherman is level 11 fishing, has 193 efficiency, using fly as bait, Scripticus Spoons line and Copper Fish Rod, my percentages are 68% for Goldfish and 32% for Hermit Can.
Note that each fishing spot has different rates for fish. For example, if you look at AFK gains at the Fishing spot closest to the desert town you will notice that your goldfish gains are different than the second Fishing spot by Whattso.
Drops
Apart from fish, you can also get various other items from AFK fishing.
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Fishing Accessories
Alongside Fishing Rods, different accessories can be equipped at the Fishing Rack. The four colored Xes increase the chance of catching the fish of that depth. FExp is Fishing Exp, FSpeed decreases time between catches, and FPow is Fishing tool power (increases efficiency). You may have one Fishing Line and one Fishing Weight equipped at a time.
Fishing Accessories
Name
Image
Type
FExp
FSpeed
FPow
Sell Price
Source
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The aim of the game is, of course, to get as many points as possible by 'casting', holding on screen (mobile) or holding left click (PC) for the required time; then letting go to cast far enough to land on the fish without hitting a mine.
When your lure lands on a fish you get the corresponding points.
1 point for Green Fish
2 points for Eel
3 points for Squid
5 points for Whale
The more casts you do the harder it gets, the fish targets start to move and more mines will appear on the screen.
The real challenge is to NEVER miss. I put emphasis on this because no matter how many mines there are on the screen; if you still land on a fish, even if it is directly on top of a mine, it will still count as landing on a fish and you will not lose the game.
Now you're allowed to miss as much as you want but the best way to get the most points is by getting a streak of landing on fish. After 3 consecutive Green Fish, Eels will start to appear and after 3 more consecutive landings (doesn't have to be Eels) Squid will appear, and finally, after another 7 consecutive landings on any fish makes the Whale appear. Be careful once the Whale shows up; catching it will reset your streak back to 1 green fish!
In 1.22, an item will tell you how to get the last one, the Megalodon . You will have to catch two whales in a row, then miss the third one. Then the "behemoth" will appear. Catching it will give you a new trophy.
Fishing Exp Quests
Quest Information for Fishing
Quest Name
Quest Text
Difficulty
Requirements
Consumed?
Rewards
Notes
Scubidew - A Normal Quest.
He's much better this way. I can't have too many free thinkers not in this world not in its current state. Get him a fish.
Upon completing Rift 16 in World 4, Skill Mastery unlocks. Skill Mastery gives you account wide bonuses based on your skill's total level across every player.
x1:
Fishing Rack. The four colored Xes increase the chance of catching the fish of that depth. FExp is Fishing Exp, FSpeed decreases time between catches, and FPow is Fishing tool power (increases efficiency). You may have one Fishing Line and one Fishing Weight equipped at a time.
Brute Efficiency
Bobbin' Bobbers
Hermit Can Card
Skelefish Card
Shellfish Card
Golden Ribs
Paper Boat
Studded Hide
Fishing Overalls
Angler Boots
Deep Sea Galoshes
Fishing Obols
Pie Seas (Ch-4a)
Stronk Tools
Warriors Rule)
Etruscan Lager
Sealed Fishheads (Bonus 1)
Fishing Rod Stamp
Oceanman Statue
Strongest Statues)
Sand Shark Card
Caulifish Card
Slurpin Herm
Aqua Pearl
Candy Canes
Idle Skilling
Catching Some Zzz'S
Bloach Card
Kraken Card
Jumbo Shrimp Card
Coastiolyte Card
Bag o Heads Stamp
All Fish Diet
Tempestuous Emotions
Jellyfish Card
Manta Ray Card
Icefish Card
Whatamelon Chain
Any Tier 2 Keychains
Fishhead Pendant
Reely Smart
Fishing EXP
Fishhead Stamp
Fish Aint Biting
Sploosh Sploosh
Holy Mackerel Stamp
Worming Undercover
Fuscismatia
Any Tier 3 
Any Tier 1 
20
