Anoxic lakes are bodies of water that lack oxygen, making them inhospitable for most aquatic life. This condition often occurs in deep or stagnant lakes where water circulation is limited. Without oxygen, the decomposition of organic matter is slowed, leading to the accumulation of nutrients and potentially harmful substances. The absence of oxygen can result in the production of methane and hydrogen sulfide, which can be toxic. Anoxic conditions can also affect the overall ecosystem, impacting species such as fish and invertebrates. Understanding anoxic lakes is important for managing water quality and preserving biodiversity in aquatic environments.