Gill rakers will help (for sure get a pic of them) but they too can be just as confused especially without a comparison to the base fish in the pond.
Ewest, can you explain this statement (in easy to understand one syllable words that even a bean counter can understand)?
Are you saying that gill rakers of a given species can very pond to pond? Or am I reading too much into this statement.
(Years of reading tax code and trying to interpret between the lines has muddled my already cloudy and somewhat demented cranial contents).