Years ago I kept hand-written fishing logs, but have been keeping electronic fishing logs using MS Excel since mid-October 2005.
Over the years I've changed some of the details I track. I track date, location fished, # of fish, species, lenght or wt. of the biggest of each species/trip, what flies or lures (and colors) caught the most or biggest fish, who I fished with, what times I started and stopped fishing (and total time fished), monthly fish totals, yearly species totals. I used to track water temps, wind speed and direction, water levels/flow rates...thought about tracking moon phases and barometric pressure, but haven't done that. I've learned a great deal about seasonal trends, and it helps me decide what species of fish, and what locations I want to fish throughout the year.
Anyway, track the things that are of interest to you. The cool thing about Excel, is you can "insert comments" into the spreadsheet cells. I can add written observations about the fishing, or about what wild animals I may have seen, or silly humans. And I also add all of my fishing pictures into these "comments", which makes it fun to look through and also keeps all your fishing pictures in one place and organized. Just drag your cursor over a cell to see the pictures pop up for that trip. I love it!
David Merical
St. Louis, MO