To eat. I prefer fish not over 8". I make a conscious effort to return large males.
Here’s some info from the MN DNR.
Bluegills are a favorite among anglers
Fish and wildlife management, to the untrained eye, can be a strange breed of cat when it comes to the female of the species.
Hen pheasants are fully protected when it comes to pheasant hunting. In the spring, we protect hen turkeys, but then make them fair game in the fall. Hunters can generally take female deer throughout the hunting seasons, but only at prescribed numbers.
As for fish, certain waters are closed to early season fishing in order to protect spawning females, most notably walleyes. But not so for bluegills.
Quizzically, the Department of Natural Resources delivers this message to the angling public: ?During the bluegill spawning season, keep some of the females but throw the males back!?
Brady Becker, assistant DNR area fisheries manager at Little Falls, said that while it can seem a contradictory message when considered in the context of typical game and fish management, there is actually good, solid science behind protecting male bluegills.
?Male bluegills may play a critical role during the spawn,? Becker explained. ?They fan out the nests for the females and they also guard the eggs and fry. But most importantly, by keeping small, genetically inferior male bluegills away from the nest, they may actually help prevent stunting in the population.?
Bluegills, Minnesota?s largest and most popular sunfish, are notorious for becoming stunted in certain lakes. ?While there are a number of factors that can lead to stunting, it basically comes down to over-population,? Becker said.
?Bluegills are more prone to over-produce than to under-produce,? Becker explained. ?When you have a lake with lots of bluegill, the bluegill can eat all the available forage. Then they grow very slowly. A bluegill that typically matures at six to seven inches will mature at five inches in lakes where there are too many bluegills.?
One means for keeping the population under better control, while at the same time protecting a more genetically superior strain of ?gills, is to leave those larger males on their nests, letting them ?do their thing? of protecting their nests during the spawn, explained Cindy Tomcko, a DNR fisheries research biologist in the Grand Rapids fisheries office.
?Smaller, inferior males (called cuckolders) swarm around the nests of large males and try to spawn while the large males do their best to keep the cuckolders away from their nests,? Tomcko said. ?If large males are fished off of their nests, the result is the production of too many, slow growing offspring - stunted bluegills.
Tomcko said there are usually more than enough females and eggs to produce plenty of young fish. ?But it?s the large males that may be the key to quality in bluegill populations,? Tomcko noted. Well meaning anglers think the are doing the right thing by keeping the males and putting the females back, when in fact they should be doing just the opposite.?
Tomcko also pointed out that because of their aggressiveness during the spawn, the males are considerably more vulnerable to hook and line at that time.
?Anglers usually aren?t going to keep four-and five-inch bluegills but they will keep those six inches and larger,? Tomcko said. ?Yet it?s the larger, male bluegills that prevent cuckolders from spawning and give you the genetic pool you want to produce large bluegill. Leave more of them in the lake and you stand a much better chance of eventually having a good, healthy crop of large bluegills.?
Other factors, such as the effects of predation (or lack thereof) and the presence of submerged aquatic vegetation also affect the size of bluegills.
Tomcko said, ?If there aren?t enough predators, particularly northern pike and bass, in a lake, bluegills are much more prone to become stunted. And we?re still studying just how much submerged aquatic vegetation along shorelines is best. We know that clearing shorelines of vegetation is bad news, but it appears too much vegetation can also be detrimental.?
The DNR has been working on improving the size of bluegills in Minnesota lakes for nearly a decade. A study by Peter Jacobson, a DNR fisheries researcher in Detroit Lakes, involved lowering the bag limit to 10 bluegill on eight similar lakes. Some lakes with the lower daily limit began to grow bigger bluegills.
The DNR continues to experiment with different daily bluegill limits in an effort to determine which lakes are most likely to respond positively to lower limits. A few lakes, such as Annie Battle Lake in Otter Tail County, Mink, Somers and Crawford lakes in Wright County, and Bass and Grave lakes in Itasca County, currently have a five-fish limit. Most lakes have a 20-fish limit.
?We?re looking for a good balance,? Tomcko said. ?Not all lakes have the food, habitat, and abundant predators to produce bluegills larger than 8 inches. But if bluegills in a lake grew large in the past, we may restore those bluegill populations by lowering the bag limit of bluegill. In the end, we hope to restore quality bluegill populations to those lakes. Releasing those larger males during the spawn and keeping the females all year round is may be one way to start growing bigger ?gills in other lakes.?
For each acre of pond, where the fish population is not being fed the recommended harvest each year is 15 pounds of bass, 100-200 pounds of bluegill, and 50 pounds of channel catfish.