Blue marlin

The blue marlin is a rare sea fish in the introduced in. It is one of the most expensive sea fish, selling for 10,000 Bells. It has a long, pointed extension of its mouth. The fish can be found all day and has a large shadow size.

Use in cooking
Blue Marlin is used as a cooking ingredient in the cooking recipes for the following items:

Donating to the museum
When placed in the museum in all games, the fish goes in the very back tank and zips around very quickly.

In
Blathers says this about the blue marlin when donated:

Blathers will talk about the blue marlin when donated dialogue.

In
The Blue Marlin can be found in the large, vertical fish tank in the rightmost room in the aquarium.

Fishing Tourney
During a Fishing Tourney, when given a blue marlin, Chip will say the following dialogue.

Real-world information
In the wild, it uses its big spear-like snout to attack fish and cephalopods that it may eat, such as tuna and squid. Represented in-game by the fact that it only appears in summer, the Atlantic blue marlin generally stays in the area of ocean south of Spain but north of South Africa. There are many names for this fish such as billfish, ocean guard, and Cuban black marlin.