Balance in fish populations is an important concept in fisheries management. Research on the characteristics and dynamics of balanced and unbalanced bluegill (Lepomis macrochirus) populations suggests guidelines relative to growth rate, survivorship and recruitment which may be applied to other species such as gizzard shad (Dorosoma cepedianum). Regulations and stocking are important management techniques which may be applied to improve the state of balance and structure in fish populations.