1. The hypolimnion becomes Anoxic usually about mid-July

2. Methyl mercury (MeHg) accumulated in the anoxic hypolimnia of both lakes during summer stratification, reaching concentrations of 0.8 ng

3. Between May and December, the annual stratification period in Lake Kinneret, sulfide is formed and accumulates in the hypolimnion.

4. Special weather conditions (persistent winds from the south) may cause a complete mixing of the epi-and hypolimnion, accompanied by an abnormal drop in air and water temperature (“friagem”).