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2. Harmful algal bloom - Wikipedia

   en.wikipedia.org/wiki/Harmful_algal_bloom

   Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.

3. Sea - Wikipedia

   en.wikipedia.org/wiki/Sea

   Various methods are employed. Mesh enclosures for finfish can be suspended in the open seas, cages can be used in more sheltered waters or ponds can be refreshed with water at each high tide. Shrimps can be reared in shallow ponds connected to the open sea. [165] Ropes can be hung in water to grow algae, oysters and mussels.

4. Beaver dam - Wikipedia

   en.wikipedia.org/wiki/Beaver_dam

   Just as algae receive energy from sunlight, these bacteria derive energy from cellulose, and form the base of a very similar food chain. Additionally, bacterial populations absorb nitrogen and phosphorus compounds as they pass by in the water stream and keep these and other nutrients in the beaver pond and the surrounding ecology. [16]

5. Frog - Wikipedia

   en.wikipedia.org/wiki/Frog

   Aquatic species such as the American bullfrog (Rana catesbeiana) normally sink to the bottom of the pond where they lie, semi-immersed in mud but still able to access the oxygen dissolved in the water. Their metabolism slows down and they live on their energy reserves.

6. Louisville, Kentucky - Wikipedia

   en.wikipedia.org/wiki/Louisville,_Kentucky

   Louisville [b] is the most populous city in the Commonwealth of Kentucky, sixth-most populous city in the Southeast, and the 27th-most-populous city in the United States. [a] [11] By land area, it is the country's 24th-largest city, although by population density, it is the 265th most dense city.