Definitely a lot of variables. Factor in the natural diversity due to geography, water clarity, time of year, etc, and it gets real complicated real fast. Then make an allowance for personal interpretation - we don't always see the same things. That's why I don't place all my eggs in an online fish identification database. To be sure they are a great starting point, and more often than not they will head you in the right direction. And the PondBoss forum and mag is at the top of the list. But I still think the best way to learn for yourself is to run a few thousand fish through your fingers.
