Fish require oxygen, just like we do. Oxygen is naturally present in water, in the form of dissolved oxygen gas. A fish breathes oxygen and reacts harshly to low oxygen levels, just like we do, evidenced by increases in heart rate and respiration. Generally, this can be witness through slow, belabored breathing (they “look” like they’re struggling to breathe). As they breathe, they consume oxygen and expel carbon dioxide, just like us. While this is not a problem for us, in an enclosed water environment, this slowly, but gradually, depletes the life-sustaining oxygen from the water. The only place the new oxygen can re-enter the water to replace the consumed oxygen is the surface where water meets air. This surface is limited in size (relative to the volume of water). Aquarists use air pumps to bring oxygen-deficient water up to the surface via the bubbles that float to the top, creating a mild, but constant circulating effect, thus maintaining the oxygen levels needed for fish to survive. You may have seen koi ponds that do not appear to have this same circulation environment I am describing. Why don’t those fish drown? Good question. It is because these ponds are very shallow and the koi swim near the surface of the water, where oxygen is plentiful. You may also notice them periodically taking gulps of air, as their mouths protrude above the surface of the water.
Furthermore as a person of faith who also is a scientist I reject utterly the general idea that Physical and Spiritual are opposite any more than fire and water are. They are different domains certainly but not antithetical and certainly not diametrically opposed ones. This is not describing color to a blind person. Or indeed even a color they cannot see to a colorblind person. It is not describing sound to deaf person either. And in all of these cases where the contextual breakdown is seemingly mechanically absolute. we can in fact and have in fact been able to do so. Typically I don’t eat any fish on the grounds that for reasons unknown the possibility of it just disgusts me, unfortunately there was a period that I ate a fish once and in the event that you set aside the opportunity to peruse on I will educate you concerning my experience… Carrots! Did I notice that I wanted to eat carrots when I was more youthful? I would have carrots for Breakfast, Lunch, and Dinner. In the event that I was fortunate I could even persuade my mother to give me a chance to have some for pastry! I was an odd child in that viewpoint however it appears as though something that would be sufficiently blameless; I mean how could yearnings for little orange delectables be an awful thing? It was the season when the Fair was town, thus like some other youthful youngster I asked my folks to take me. Between my breathtaking conduct and consistent asking they at last took me to the neighborhood Fair.