Access digital copies of guides and regulations publications from the Nebraska Game and Parks Commission.
Issue link: http://digital.outdoornebraska.gov/i/605475
. . . . . . . . . . . . . . . . . . . second edition • Nebraska Pond Management • 71 Summerkill Fish found dead Consecutive days and nights Add fresh water and/ and/or gasping for of cloudy, hot, still conditions; or agitate the water air at the surface, very high water temperatures surface to facilitate particularly in early (above 85 degrees) and not oxygen absorption; morning hours; larger enough dissolved oxygen; deepen pond to limit fish usually die cloudy skies prevent plants vegetation growth and first, little effect on from producing oxygen; calm increase water volume other aquatic animal winds prevent mixing of so more dissolved life (frogs, turtles, etc.). oxygen into surface water; oxygen can be stored aquatic organisms' respiration and/or install an and plant decomposition aeration system. deplete available oxygen; shallow, weedy ponds are especially vulnerable. Inversion Dead or gasping fish Large sudden inflow of cool Install an aeration (larger fish affected rainwater and strong winds system to circulate and first) found after a cause bottom water (low in aerate oxygen deficient violent thunderstorm dissolved oxygen) to mix bottom water and/or which produced with the surface water, deepen shallow water heavy downpours resulting in critically low areas to restrict and high winds. oxygen levels throughout; vegetation growth. can occur in shallow, weedy ponds or ponds that contain deep, stratified, stagnant water; both types in combination with large, steep drainage areas with high runoff rate; lightning can also cause a fish kill, affecting all fish species of all sizes in the immediate strike area. Seasonal Dead or gasping fish Stratified and/or unoxygen- Install an aeration Turnover (larger fish affected ated deep water mixes with system to circulate first) found in spring surface water in spring and and aerate oxygen- and/or fall. fall when surface and deep deficient bottom water. water temperatures are the same, resulting in critically low oxygen levels; wind can facilitate the mixing. CAUSE of RECOMMENDED FISH KILL SYMPTOMS PROBLEM SOLUTION(S)