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2. Hypoxia in fish - Wikipedia

   en.wikipedia.org/wiki/Hypoxia_in_fish

   Conversely, fish hemoglobins with a low P50 bind strongly to oxygen and are then of obvious advantage when attempting to extract oxygen from hypoxic or variable PO 2 environments. The use of high affinity (low P50) hemoglobins results in reduced ventillatory and therefore energetic requirements when facing hypoxic insult. [65]

3. Fish kill - Wikipedia

   en.wikipedia.org/wiki/Fish_kill

   Fish can endure short periods of reduced oxygen. Depleted oxygen levels are the most common cause of fish kills. Oxygen levels normally fluctuate even over the course of a day and are affected by weather, temperature, the amount of sunlight available, and the amount of living and dead plant and animal matter in the water. [8]

4. Hypoxia (environmental) - Wikipedia

   en.wikipedia.org/wiki/Hypoxia_(environmental)

   Global map of low and declining oxygen levels in the open ocean and coastal waters, 2009. [1] The map indicates coastal sites where anthropogenic nutrients have exacerbated or caused oxygen declines to <2 mg/L (<63 μmol/L) (red dots), as well as ocean oxygen minimum zones at 300 m (blue shaded regions).

5. Low-oxygen levels off coast a concern for fisheries - AOL

   www.aol.com/news/low-oxygen-levels-off-coast...

   Sep. 14—Low-oxygen levels off the coast of Oregon and Washington state hit earlier than usual this spring and have lasted longer than any other hypoxic event recorded on the West Coast in the ...

6. Dead zone (ecology) - Wikipedia

   en.wikipedia.org/wiki/Dead_zone_(ecology)

   Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes. Hypoxia occurs when dissolved oxygen (DO) concentration falls to or below 2 ml of O 2 /liter. [2] When a body of water experiences hypoxic conditions, aquatic flora and fauna begin to change behavior in order to reach sections of water with higher oxygen levels.

7. Deep-sea fish - Wikipedia

   en.wikipedia.org/wiki/Deep-sea_fish

   The deep sea is also an extremely hostile environment, with temperatures that rarely exceed 3 °C (37 °F) and fall as low as −1.8 °C (29 °F) (with the exception of hydrothermal vent ecosystems that can exceed 350 °C, or 662 °F), low oxygen levels, and pressures between 20 and 1000 atm (between 2 and 100 MPa). [3]