Signese

I have no idea. I can read it, but it makes no sense to me.

"raising fish clarification water quality"?? -- improving the water quality for raising fish?

"fishing pollution water source"?? -- the source of water pollution due to fishing?

If I'm halfway close, I'd say the first is good and the second is bad.

Note that many words in Chinese can be freely changed from nouns to verbs or vice versa.

Yeah, you're on the right track, but not quite there.

Since no one else is brave (or stupid) enough to try, here I go again.

养鱼净化水质 -- raising fish here that improve (clarify) the water quality (i.e. eat waste or pollutions or something)

钓鱼污染水源 -- fishing here will pollute the water supply (i.e. by removing the pollution eating fish?)

To be honest I don't think the Chinese deserves any prizes.

养鱼净化水质 raising fish purifies water quality. This is a bit dodgy, you purify water, but increase water quality.

钓鱼污染水源 -- fishing pollutes water sources