Clue bottle

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Reason: Information about chances and drop mechanics has been outdated since Combat Achievements release.
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Clue bottles are bottles that can be found while training Fishing. Opening them will destroy the bottle and leave players with a clue scroll of the same difficulty as the bottle given. Players will not receive a clue bottle if they possess a clue scroll of the same difficulty tier. Like clue scrolls, players can only have one of each type of clue bottle in their possession.

There are five types of clue bottles:

• Clue bottle (beginner)
• Clue bottle (easy)
• Clue bottle (medium)
• Clue bottle (hard)
• Clue bottle (elite)

Rates

Like skilling pets, the rate of obtaining clue bottles are dependent on the player's fishing level and the type of fish the player is catching. A ring of wealth (i) will double the rate of clue bottles for fishing spots in the Wilderness.

The chance of obtaining a clue bottle of any difficulty is $[(100+Y)/X]$, where $Y$ is the player's fishing level and $X$ is the base chance of the fish. Equivalently, this chance is 1 in $[X/(100+Y)]$. For example, a player catching anglerfish at level 99 fishing will have a 1 in 395 chance of obtaining a clue bottle, with decimal values floored.

The table below displays the base chances of obtaining a clue bottle; all rates are confirmed by Mod Tide. It is unknown exactly how Combat Achievements affect these rates.

Fish	Base chance	Rate range (approx)	Fish	Base chance	Rate range (approx)
Leaping fish(trout, salmon, sturgeon)	1,280,862	1/8654 - 1/6436	Mackerel, cod, bass	1,147,827	1/9895 - 1/5768
Sardine, herring	1,056,000	1/10057 - 1/5307	Minnow	977,778	1/5372 - 1/4913
Trout, salmon	923,616	1/7697 - 1/4641	Shrimps, anchovies	870,330	1/8617 - 1/4374
Aerial fishing	636,833	1/4453 - 1/3200	Karambwanji	443,697	1/4226 - 1/2230
Pike	305,792	1/2446 - 1/1537	Tuna, swordfish	257,770	1/1909 - 1/1295
Karambwan	170,874	1/1036 - 1/859	Infernal eel	165,000	1/917 - 1/829
Dark crab	149,434	1/808 - 1/751	Monkfish	138,583	1/855 - 1/696
Rainbow fish	137,739	1/998 - 1/692	Lobster	116,129	1/829 - 1/584
Sacred eel	99,000	1/529 - 1/497	Shark	82,243	1/467 - 1/413
Anglerfish	78,649	1/432 - 1/395

Changes

Date	Changes
21 July 2021 (update)	Clue bottle rates are now affected by completion of Combat Achievements. Clue bottles no longer roll to determine which tier of clue you get after the initial roll to give you a clue bottle.