We all know what that means, don’t we?
The days when it starts warm, then quickly gets hot. Good for fun in the sun, right? Maybe for us humans, but for your fish it is a different matter. For starters, warm water can hold/absorb less oxygen than cold water. That is just the laws of physics. If your pond is deeper than 7-9 feet, it can set up a thermocline (temperature dividing layer) late in the summer. If that happens, the cooler hypolimnion (deeper area) is not mixing with the warmer epilimnion (shallower area). Sounds harmless, doesn’t it? The problem is, that stratification means that the lower, cooler area of the pond may well not have enough oxygen to sustain fish life.
Worse yet, if may have much more oxygen demand due to suspended solids and a thick layer of muck at the bottom of the pond. Your fish may survive just fine, until…all of a sudden you get a torrential thunderstorm. That cool rainwater hits the warm/hot top of your pond. Guess where that cool rainwater wants to go? It is cool and more dense than the warm water, so it wants to go straight to the bottom of the pond. The problem is, that sequence of events then mixes all of the water in your pond. The good, oxygen rich water at the top mixes with the low oxygen water at the bottom of the pond. Result? A disastrous fish kill.
Call the experts at Keeton Industries to find out how to avoid late summer/fall fish kills!