Construct a valid question about the article you just read.
Article: 

Scientists have discovered a new species of fish in the Amazon river.
What kind of fish species was discovered by scientists in the Amazon river?
Complete the following task based on the instruction and optional input provided.### Instruction:
Construct a valid question about the article you just read.

### Input:
Article: 

Scientists have discovered a new species of fish in the Amazon river.

### Output:
What kind of fish species was discovered by scientists in the Amazon river?