Time for a few facts of life about the colony nesting sunfishes including bluegills, shellcrackers and crappies.
1. Virtually all the fry that survive from any colony of nests comes from the center nests in those beds. Virtually 100% of the fry from the edge nests perish.
2. Those center nests are dominated by the largest male fish in that breeding population; so harvesting them is killing off the prime male members of that population.
3. The biggest females actively seek to spawn in those center beds combining the best of the males with the best of the females. The largest females also produce orders of magnitude more eggs of higher quality than the smallest females.
4. Those fish too old to spawn rapidly deteriorate and die off in nature almost never surviving between spawning seasons once age deterioration sets in. There is no extended decrepancy period for these fish in the wild. Either they continue to be healthy enough to able to spawn abundantly or they die off quickly.
If you take the biggest fish off the beds, you are not only harvesting the highest quality breeders in that population, you are harvesting those not only most likely to be successful at it you are eliminating the selective pressure for that species to reach its maximum size in that particular water.
Because there is one other factor. Male fish in these species will extend their juvenile period until they are large enough to compete with the biggest fish in the population for those prime central nesting spots in the breeding colony. Females grow to match the male sizes available. There is a natural pressure to maximize the size of these fishes that the local water can produce, unlesss the biggest are harvested regularly. Only humans concentrate on the top sizes; virtually all other predation on these fishes is most heavily on the smallest sizes available from larvae to fry to juveniles, and the juveniles need the life expectancy periods necessary to grow to sufficient size adults to have a chance to dominate the local breeding colonies.
Up here it may take a bluegill for example some 7 or 8 years to reach 10" or about a pound. Most of that time will be spent as an immature fish, since they stop growing for the most part once they become sexually mature. To reach bull bluegill size they must have extended juvenile periods to do it in. That is despite the fact that without the standards of size presented by the presence of larger fish all of the colony breeding sunfishes can mature very rapidly. Once they do you have a breeding colony of younger smaller fish. That is far more often the case when all there is are small fish than stunting due to overpopulation, except in ponds where potential for growth is limited unless carefully cultured. Pond fish are very close to being domesticates in fact. In most larger waters they will over time naturally produce the largest size in the size structure when the largest fish are not removed as dominant breeders and will reestablish that quite naturally if harvest of those large size is curtailed sufficiently.
Even catch and release of nesting males results in the total loss of any eggs or larvae that might have already been present. Those of the larger fish will have been the highest quality offspring in the colony and the most likely recruitment potential for maintaining that size will then also be lost. Catch and release of the females around the colony and at their concentration points will cause much less damage, since the females do not brood the fry, and brooding the fry is vital to any chance of their survival. Personally I want the best males to have the best chance to give the highest quality fry the best possible start. If I start taking breeding condition males, especially crappie males, I will back off and look for other places and/or other species to fish for.
I avoid fishing the nesting colonies of crappies and sunfish. That is when I will turn to catfish or walleyes or perch until the nests are left behind, although I will fish catch and release for the females, if I can sort out the distinct areas they are assembling in without disturbing the nesting males. I will certainly never point out an active bed that is being overlooked by others.
To me it is a matter of protecting the highest quality breeding stock in the waters I fish. Not that I do not love eating fresh fish and crappies are the best there is. I handle those few meals I actually harvest as special treats, and those come at other times of the year.
I certainly cannot say that anybody MAY not or even should not fish when and where it is legal for whatever numbers of whatever quarry they may legally take, but to me that is the maximum limit one may push out of respect for the quarry not an admonition to maximize one's harvest. The limits are in fact set with the assumption that many if not most anglers will not fill them out completely on every trip. A great many will not do that on any but the rarest of occasions. Those who can need to be much more careful to harvest selectively IMO, but that is attitude on my part not legal limitation. The law gives the rights; it is up each individual how much of those rights one wishes to exercise at any given point. Overdo it, even legally, and you will find crappie size declining and your local state conservation department will inevitable reduce the limits and/or clamp on size restrictions. That is happening all over the country.


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