IE8 – Ten Grand is Buried Here Clue 4

The latest clue for the Microsoft Internet Explorer 10 grand treasure hunt is…………………….
“a predatory fish being earnest”.
A Shark, pirahna?
Ernest Hemmingway?
Earnest = serious, severe, sedate?
Find the other clues:
Clue 1
Clue 2
Clue 3