What might be a consequence of global warming for fishes living in a pond?

Global warming is resulting in climate change, which is influencing almost all the life found on the planet, however, with the change in climate, the fishes thriving in aquatic bodies like ponds have to face various challenges.  

As it is known that warm water exhibit less tendency to carry dissolved oxygen in comparison to cooler water. Thus, with the influence of global warming, water bodies like lakes, ponds, rivers, and oceans are going through a phenomenon called deoxygenation. Therefore, with the warming of the planet Earth, the aquatic bodies like ponds possess less tendency to contain oxygen in the dissolved state, thus, diminishing the tendency of the fishes to use oxygen for the process of respiration.  

use smarts app it gives all theanswers

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).