crsublette
coyotes call me Charles
Waterbug said:First, I shouldn't be using the term "crash", bad habit. It's cool sounding. Better to use "swing", but unfortunately it sounds more fun than dangerous.
I don't think pH swings would effect larger fish first. It's really hard to say because we're talking about something that normally doesn't have any visible symptoms...just a blanket term, stress. Bunch of internal stuff, heavier slime coat, but that's pretty hard to see unless crazy heavy. I have no idea, but if I had to guess I'd think smaller fish would be more affected faster. My assumption is smaller body the faster the surrounding water would affect their blood pH which drives the stress. Purely a guess on my part. There's so much to learn I kind of draw a line at some point. It's enough for me to understand the basics of how pH swings effect fish to get an idea of how much of a danger we're talking about. Once I learn that and decide to buffer water I concentrate on that so I don't have to learn the details of things like how water pH changes fish blood pH. Be cool to know, but there's only so much time.
From what I have read and understood, which I have a reference on it somewhere, the main reason why big gold fish or quite large koi is a rarity in casual hobbist ponds is due to their size. Bigger fish consume more out of the water. So, as pollution becomes higher, oxygen concentrations go lower, and pH swings more profound, then the bigger fish's gills and blood will receive more damage and less likely to recuperate. However, I have heard smaller fish to being more susceptible to temperature swing. These have been my impressions; so, I would definitely read this with a grain of skepticsm.