Albacore

Angler

Barracuda

Char

Corvina sounds too much like a car model. 

Corvina

Cobia

Dorsal

As a member of two trendy name categories, animal and occupational, this name broke into the Top 1000 in 2004 and would make a nice tribute to an angler Grandpa.
 The best known bearer, Fisher Stevens, pulled a switcheroo on his birth name Steven Fisher. Fischer (another possible spelling) Black was a distinguished economist.
 Fisher is a fairly common surname, whose bearers include the family of Eddie, Carrie, and Joely; actress Isla; food writer M.F.K. Fisher; and two legendary cartoonists: Bud Fisher, creator of "Mutt 'n' Jeff," and Ham Fisher, who invented Joe Palooka.

Fisher

Herring

Javelin

Kingfisher

Though this simple, appealing name works for both genders in Japan, it's best known as the name of the princess who chose to leave the Royal Family in order to marry a commoner. As a boys' name, it can be a short form of Makato.

Mako also means "shark" in Maori, and is the name of two shark species.

Mako

Marlin

Mackerel

Mariner

If used at all these days, it would be to honor artist Jackson, whose first name would be far preferable. 

Pollock

Piranha

The surname Rudd, made most famous by Antman actor Paul, derives from the words ruddy or red and may have originally been given to someone with a reddish complexion.

While this name can theoretically be a short form of Rudyard, we like it just as it is. You might see it as an honor name for Daniel Rudd, who started the first newspaper for Black Americans and was an early Civil Rights aactivist.

Rudd

Rockling

Sable

Sabre

Skate

Sturgeon

Trigger

Turbot

On the rise as an independent name: Zander and Xander are both widely used can increasingly be found as characters in movies and on TV. 

Zander

justthinkin's list "Boy Names for Families Who Love to Fish" of 27 great name ideas: Ahi - Zander!

Boy Names for Families Who Love to Fish

Names inspired by either the fishing pastime or the fish themselves. Some bold, some quite wearable. Options for an offbeat middle name.