Scorpion Carp

Overview
Scorpion Carp is a fish that can be caught in the Desert. It is one of the desert-exclusive catches and is also useful for several side systems, including fish ponds, tailoring, dyeing, and quests.
In a 

- First pond quest: expand the pond from 3 to 5 fish by bringing 3 Cactus Fruits or 3 Coconuts. This grants 40 Fishing XP.
- Second pond quest: expand the pond from 5 to 10 fish by bringing 1
Golden Relic. This also grants 40 Fishing XP.
The pond’s output changes with population. At lower populations, roe is the most common result, while higher populations increase the chance of multiple roe and make Cactus Seeds possible at population 10. If the pond is empty of item production for a day, it produces nothing instead.
Scorpion Carp can also be used in the 
It can appear on the Help Wanted board after The Desert is unlocked, where it may be requested as an item delivery task for a reward and 150 Friendship points. 
A notable fishing detail is that Scorpion Carp has a theoretical maximum size of 33 inches, but in actual gameplay it cannot be caught above 30 inches because of the layout of the Desert pond. Catching a 30-inch Scorpion Carp requires at least Fishing level 18.