Evolution avoidance syndrome
That's the title of an essay by my colleague Scott Lanyon. He notes that "development" refers to changes within an individual, whereas changes in the genetic composition of a population are known as "evolution." Apparently some public officials were afraid to say that a fish population could "evolve" resistance to a newly arrived pathogen, so they say they hope resistance will "develop." This is confusing, because individual susceptibility to pathogens can develop, increasing or decreasing with age, but that's not what they were talking about.
I used to run into a similar problem when I worked in an agronomy department. Some of the people I interacted with would say that an herbicide had "broken down", when actually the weed species it once killed had evolved resistance to it. The change was in the weeds, not in the pesticide. This misuse of the English language is particularly harmful because herbicides do break down (chemically degrade), which is usually a good thing; we don't want them polluting lakes, for example.
Populations evolve, but don't worry, fish and weeds didn't evolve from apes.