Some Massachusetts lakes are experimentally limed to raise water column pH and alkalinity to mitigate the effects of acidification and to aid in fisheries management. This study evaluated the ecological effects of liming by comparing and contrasting several water chemistry and ecological variables in two softwater ponds. Physical, chemical, and biological parameters have been monitored in Great Pond, Truro, Massachusetts, before and following the addition of lime in March, 1985. Ryder Pond, Truro, Massachusetts, a nearby similar kettle pond that has never been limed, was concurrently monitored as a reference. Results with implications for water resources and fisheries management strategies are presented.Micropterusdolomieui(smallmouth bass) recruitment was successful following liming. Zooplankton and chironomids, both fish prey, declined after liming, however. Elevated calcium concentrations persisting after pH has declined may permit longer intervals between liming events.