Dissolved oxygen levels increase with photosynthesis, the process by which plants transform sunlight, water and carbon dioxide into oxygen.When there is less sunlight, photosynthesis slows and at night it stops. But plants and animals in the water continue to consume oxygen at the same rate, decreasing the concentration, Texas Park and Wildlife officials said.
Gulf menhaden, a small fish species which fishermen commonly use for bait, was most affected in the kill, Texas Parks and Wildlife said. By Sunday evening, Quintana Beach was mostly cleared of the dead fish save for some that machinery couldn't remove, county officials said.
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