Bottom line, this type of study does not prove cause and effect. If I did a study on sunrise and humans waking up, I would find 100 percent correlation, but that doesn't mean that the sun came up because you woke up. Correlation, yes; causation, no.
This study does not tell us if these are valid concerns or not, and we can't make any meaningful conclusions from this new study. This study does NOT indicate that omega-3 supplementation or eating fish are a contributory factor in the prostate cancer equation for numerous reasons.
The first thing you need to know is that no fish oil supplements -- or any other kind of supplements, for that matter -- were given in this study. None. This study looked at blood levels of long-chain fatty acids such as those found in fish (EPA and DHA).