Infected Scale

A scale carved from Abyssal creatures

Carved from Abyssal Reaper and Abyssal Ankylosaurus corpses, the Infected Scale is listed in our records for ARK: Survival Ascended, and the ARK Wiki gives Aquatica as its DLC. The game describes it as "An infected Scale. Can be used to apply infected augments to creatures." The wiki gives 360.1 as the version that added it. One scale weighs 0.1, and a stack of 100 weighs 10.

Harvesting scales

Both source creatures can be found in the Abyss biome, and the Abyssal Ankylosaurus can also be spawned in low-tier Rifts. Bodies lying in the corrosive areas yield Infected Scales too, together with other infected parts. The wiki advises the Carving Knife for this work and warns that carving those corpses completely brings on a spore debuff that resembles Aberration's fertile spores.

Barnacles and eating it

At the Infectarium, the scales go into Infected Barnacles. Barnacles made with Infected Scales raise the chance of resisting infection with Poison and Jaundice.

Players and tames can both consume it:

• Survivors: it deals 25 damage and restores 10 Food. Movement Speed goes up, and Food and Water drain rises by about 20%. The icon also claims a Melee Damage boost, but according to the wiki it seems to do nothing.
• Tames: force-feeding raises their Movement Speed without hurting them; their damage output stays the same.

The wiki states that the effect of eating infected body parts lasts 30 seconds. Eating another while it is active does not stack it; the timer simply starts over at 30 seconds.