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Managing a Stunted Largemouth Bass Fishery

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Posted May 1, 2012

Many small lakes and ponds across the country are not actively managed for quality or trophy largemouth bass. If fishing for largemouth bass is not a goal for an impoundment (body of water such as a lake or pond), there is often no need to manage largemouth bass in the impoundment. However, if fishing for largemouth bass is an important goal, lack of or improper management can result in a stunted largemouth bass fishery.

A stunted fishery is one in which the majority of a species has stopped growing and is similar in size. This happens when there is not enough forage to feed an overabundance of fish in a given size class. When this occurs, most fish caught only vary in size by a few inches.

Many impoundment managers and largemouth bass anglers view a stunted largemouth bass fishery as a negative situation. In most stunted largemouth bass fisheries, the average length of largemouth bass caught is approximately 7 to 12 inches and weights average less than half a pound. To address this issue, bluegill may need to be stocked (if absent), low fertility of an impoundment may need to be addressed, or adequate numbers of fish from the stunted size need to be removed. Unfortunately, there is not one correct answer.

When largemouth bass removal is appropriate, the general rule of thumb is to start by removing 10 pounds of stunted fish per surface acre of the impoundment. The following year, survey the fishery to determine whether there was an increase in average length of caught fish. If there is no change, increase removal of largemouth bass to 15 pounds per surface acre. Continue increasing the harvest rate each year until a change is noted. In one 16-acre impoundment, only minimal growth was achieved after removing 17 pounds of stunted largemouth bass per acre for two consecutive years. After two years of removing largemouth bass at this rate, the average length and weight of caught largemouth bass increased by 0.75 inch and 0.25 pound, respectively. Increasing average size of largemouth bass is easier in smaller impoundments than larger ones because of the labor involved in removing surplus fish. However, smaller impoundments can be more easily overfished. To determine if largemouth bass are stunted in an impoundment, read the Noble Research Institute fact sheet How to Survey the Fish in Your Pond.

stunted bassThis is an example of largemouth bass harvested from a stunted fishery. Even though their ages are different, they are similar in size.

A stunted largemouth bass fishery can have several positive aspects. They are excellent places to introduce someone to fishing or take young anglers. Due to the high number of fish in the impoundment, catch rate is usually good, which helps maintain the attention of beginning or young anglers. This type of fishery can be desirable to control the young of typically undesirable fish, such as bullheads. Also, a stunted largemouth bass fishery is often desirable when managing for trophy-size bluegill, hybrid sunfish or redear sunfish.

Each impoundment manager needs to determine whether a stunted largemouth bass fishery is right for his or her goals.

Steven Smith
Wildlife and Fisheries Consultant