Originally Posted by ewest
Yes, the fish can be decimated by either too high of temps (near or above lethal max temp) or not enough O2 (below minimum required amount). When near those levels in combination the stress can actually get them first even before max/min level is present.

Not to muddy the water, but the same can be seen in Tilapia when water temp drops. They might die due to stress related issues caused by the low water temp before the water temp hits the lethal level for them.

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