You cast your line into that still pond and wait for it to get tugged on. Then you feel something pulling back and see a flash of silver. And there’s the fish!
But what kind? If you are a sunfish angler, do you wish to keep only the desired species? Or maybe you’re an accidental bass angler and hooked a sunfish instead.
In either case, bluegill and green sunfish can be confusing unless youve taken the time to study them. They both has the same basic shape with the same vertical bars, and they tend to hangs around lily pads and docks. No wonder people gets confused.
Both species are members of the centrarchid family which rules much of freshwater habitats of North America. They inhabit the same waters, eat a lot of the same baits, etc. But as you will see, they’re very different creatures. They has different tastes, different behaviors, and different regulatory designations.
Knowing the distinction can save you from a bad day of fishing. It’s also a way to respect the ecosystem and follow the law. You don’t want to take home a protected green sunfish when all you’re allowed is bluegill.
How to Identify Bluegill and Green Sunfish
Why Distinguish Bluegill From Green Sunfish
The face is the simplest way to begin identification. There is something about structure of a bluegill’s face that seems to be designed just right. Its mouth is compact and its lower jaw isn’t elongated past the upper jaw.
Facial Structure and Jaw Differences
Not so with the green sunfish. Its lower jaw juts far outward from its upper jaw, creating a bulldog-like profile to the fish. This design is how the green sunfish can absorbs bigger meals.
And it certainly simplifies ID if you know what to look for. Outstretched lower jaw? Green sunfish.
Evenly matched jaws? Probably bluegill. To confirm color, you need to take a closer look.
Color Patterns and Gill Covers
Bluegill get their name from the obvious blue tint on the gill cover, or operculum. Most of the time this blue will be bordered by some orange or red, giving them a very distinctive color pattern when compared to the rest of the body. The body is typically olive or some shade of greenish and fades into vertical bars that dissapears towards the belly.
Although they’re called green sunfish, most aren’t actualy brightly green. They are typically olive or brownish-green with lots of spots. Body spots is usually irregularly shaped and pretty large.
There is no clean blue ring around the gill cover as there is with the bluegill. It may have a small less well-defined yellow or orange dot instead. Overall it’s just more muddled and dark looking.
Body Shape and Hunting Behavior
Another clue is body shape, which reflects their different hunting styles. Bluegill are more disc-like and deeper bodied. They’re more round with a compressed profile that enables quick darts into and out of cover.
Green sunfish are more elongate. They aren’t quite as deep bodied than bluegill and therefore has a bit slimmer profile than bluegill. That indicates their hunting style too.
Green sunfish is more active foragers, whereas bluegill ambush prey from cover. Also, green sunfish are generally more aggressive than bluegill. They will bite easier on smaller baits and put up a harder fight.
This aggression works well for casual anglers looking for a fight. However, it leads to green sunfish dominating bluegill in areas where they both live together. The real-world application is the flavor.
Taste Profile and Harvest Regulations
Bluegill are well-known to be better food then their close relatives. Mild, white and firm, bluegill are popular throughout the nation at fish fries and other southern cooking. Green sunfish tend to be known for having a stronger flavor.
When harvested from dirty water, they can sometimes have a gamy and/or muddy taste to the flesh. Because of this, many states’ harvest regulations often limit the amount of green sunfish an angler can catch. Some states limits the size or number of green sunfish that can be kept while others don’t limit bluegill much, if any.
Always know your local laws when harvesting a fish. Knowing these differences alters your fishing. You take a breath before pulling that fish out of the water.
Final Identification Tips
You inspect the color of its gill cover and check if the lower jaw protrudes. You observe the deep body of the bluegill and the spotting of the green sunfish. And this isn’t some classification exercise.
This is all about appreciating the fish we catch and the waters we visit. Next time you cast, pay attention to these details. If you learn to read them, your next sunfish catch will share its identity with you.
It would of been helpful to know this sooner.
