| Secondary thermoclines may develop in the epilimnion, and these will migrate downward to the main seasonal thermocline. |
| Normally, there is not much mixing of the water above and below the thermocline. |
| I have noticed on previous dives that most of the fish, understandably, stick to the shallows and the warmer water above the thermocline. |
| Descending for the first time, I encountered a thermocline so intense that I thought something was wrong with my eyes. |
| During the study, the thermocline gradually declined and vertical mixing started, leading to a transition from a nutrient-depleted period to a nutrient-replete period. |
| The water at that depth is a constant 4°C, its temperature protected by a layer of water above it called a thermocline. |
