Understanding biological basics fosters fishing success. That mantra was one of the cornerstones of In-Fisherman philosophy that changed the world of fishing in the late 1970s. This approach continues to be particularly pertinent when it comes to finding and catching spawning sunfish.

Scientific observations of the timing and activities of sunfish species in various regions assist the process. Spawning in clear shallow water, they’re a natural for fishwatchers, amateur and professional. And with planning and help from Mother Nature, you may catch the biggest fish of the year.

Bluegill Spawning Biology

Bluegills are the most widely distributed sunfish, thriving in waters large and small and coast to coast, since their popularity among eastern anglers led to western introductions in the late 1800s. In the southern fringe of their range in South Florida, bluegill may start spawning in late February as water temperatures rise toward 70°F. Populations farther north spawn progressively later, but at similar water temperatures.

As with black bass and crappies, northern fish often begin to spawn at lower water temperatures than fish in more temperate areas. It’s as though they want to get the deed done as soon as possible, knowing the summer growing season is short for offspring and parents alike. Moreover, large bluegills tend to spawn first, occupying the best areas.

Nest building and defense of eggs and fry improve survival of hatchlings but make adults more vulnerable to attack by predators as well as harvest. The spawn can be broken down into 5 stages: 1) Male establishes a territory; 2) he constructs nest; 3) male courts one or more females with lateral displays and fin movements, chasing, and nipping; 4) egg laying and fertilization; 5) male defends developing eggs, larvae, and fry from predators and fans the nest to oxygenate it and prevent silt buildup.

A combination of increasing day length, warming water, and an internal biological clock seems to cue male sunfish to move shallow and start building nests. Because this species nests in colonies, there may also be some involvement of pheromones from males and females that draws more fish to the colony, where over 100 adults may be in various phases of the spawn.

Because eggs typically hatch more successfully in protected areas, sunfish select quiet bays, protected flats, and the backs of feeder creeks for nesting sites. Typical nest depth is just a couple of feet, though in extremely clear water, fish may bed from 10 to 15 feet deep, possibly even deeper. Bluegills form nesting colonies on flat, sandy areas, but if some cover is available, such as lily pads or sparse brush, they tend to use it.

Male sunfish are able guardians, chasing off fish that come too close, no matter their size. Larger males react to intruders at a greater distance than smaller ones. This might be due to greater aggression, or else better vision since visual acuity increases with age in this species.

After fry depart the nest, males may build another or occupy one fanned by other fish if spawning activity continues. Typically, however, spawning subsides after a few weeks. In northern waters, ovaries of prespawn females contain both large and small eggs, the larger are released first with the remainder developing weeks later. Secondary spawning aggregations are smaller and less synchronized.

In temperate and southern waters, bluegills spawn throughout summer, peaking at intervals of about a month. Extremely warm water or dense weedgrowth may inhibit spawning but it resumes in early fall, as late as October in south Georgia and Florida. Fry production from successful nests typically ranges from 10,000 to 20,000 but can exceed 100,000 under prime conditions. In southern waters, females just a few months old may begin spawning. Egg production increases with size and age.

Catching Spawners

The best catches often come at the onset of the Spawn Period, before fishing pressure mounts and when the first wave of big fish arrives. Track water temperatures in traditional spawning bays and shallow areas likely to attract fish. Morning temperatures are important. If a bay warms from 62°F to 70°F during a warm day, that isn’t enough to jump start the spawn. It takes morning temperatures in the upper 60°F range for fish to be metabolically ready to begin nesting.

On the water, scan shoreline flats that have a sufficiently hard bottom for nest building. Males sweep silt off a layer of sand, often leaving round, lighter circles against a darker background. Once a colony develops, the terrain resembles the dimpled surface of a golf ball.

Once you find spawning fish, it’s generally best to anchor. The fish can be skittish and spooked by the sound of a motor or shadows coming too close. They may dart away when you arrive but resume their activities within a few minutes.

A great new shallow-water anchoring option is the Power-Pole, a hydraulically powered, 8-foot fiberglass pole that mounts on the stern and can be deployed in seconds. Poking into the bottom, it holds the craft in place so a spot can be precisely fished.

Male bluegills rarely feed during the spawn but strike small jigs or livebaits presented near or on the nest. When not actively spawning, females hold in nearby brush or vegetation and are generally eager to feed. Underhand pitching works well with a 10- to 12-foot pole and 8-pound line, a small slipfloat, and either a baited hook or small jig.

Particularly in water less than two feet deep, and where cover is sparse, spawning fish can be spooky. Move too close and they abandon the beds. Long-distance casting with a long, medium-light spinning rod is the answer. A slipfloat or fixed float like Rainbow Plastics A-Just-A Bubble helps propel the cast and keeps the bait in the zone. Fish may dart away as the rig splashes down, but wait a minute and they’re back at it.

An extreme ultralight spinning rod, 8 to 10 feet long, can propel ice-style jigs that land softly and slowly drift along. It’s a fun and effective option when you find bedding sunfish of any species.

While tiny softbaits on jigheads generally draw bites, the biggest fish can be wary. Top livebaits include crickets, medium garden worms, and small leeches. Even in the act of chasing a plump female, a male sunfish can be distracted by a wriggling morsel dropped near his path.