01-15-2019, 04:43 AM
That variation from low pressure to high atmospheric pressure is nine tenths of an inch of mercury. Multiply that by the specific gravity (density) of mercury and that is just one foot and three sixteenths of an inch of vertical difference in water. The pressure at different depths of water is far more significant than changes in atmospheric pressure. Pressure is greater going deeper, so at low atmospheric pressure, the fish would have to go just a foot deeper for the same pressure compared to high atmospheric pressure. That's hardly a difference yet somehow the fish use detection of that difference to control their eating patterns. Silly fish! What are they thinking?
Wind and rain and sudden change in air temperature is felt a lot more by fishermen than by fish. Besides, they're already wet, so what do they care if it rains on us!
I don't understand what they are thinking on pressure, but for calm and sunny going deeper makes sense because predator birds can spot them shallow and dive in and bring them up to another world. Likewise utilizing wind and rain to feed near the surface makes sense because either will break up the flatness of the surface of the water to make it hard for the preditor birds to see the fish.
[signature]
Wind and rain and sudden change in air temperature is felt a lot more by fishermen than by fish. Besides, they're already wet, so what do they care if it rains on us!
I don't understand what they are thinking on pressure, but for calm and sunny going deeper makes sense because predator birds can spot them shallow and dive in and bring them up to another world. Likewise utilizing wind and rain to feed near the surface makes sense because either will break up the flatness of the surface of the water to make it hard for the preditor birds to see the fish.
[signature]