I found that this was true with most fish species and the activity level of fish is largely due to what the weather and moon are doing at the time that you go fishing. In other words I discovered that I could use the weather and moon to my advantage when I was fishing. I began to think back to the times that I had experienced amazing days fishing. The kind of days where it seemed as if no matter what I did, I caught fish, and not only did I catch fish but those fish tended to be larger than "average". Have you ever experienced this kind of day while fishing?
The very productive Cassini mission might attain some indirect information by analyzing the ring arc material--however, it is unlikely to come close to the little moon again before the mission ends in 2017.
Were you aware of the fact that the moon has a huge impact on fishing? I used to find this hard to believe, but it's true. And you don't have to be a rocket scientist to understand how the moon and fishing fit together. As a matter of fact, by spending about a half an hour educating yourself can pay huge dividends in not only the amount of fish that you catch, but also the size of those fish. All because of the moon, who would have thought?