I have made a Fish Tycoon DS Checklist. It is a spreadsheet and made with OpenOffice.org Calc. Enjoy and if you spot any mistakes, please post here so I can correct them.
To download and use this, simply download the attachment and unzip the zip file.
PS: The Chart has all the fin and body names, so if you don't want to know the names, and discover them for yourself, don't download.