http://forum.square-enix.com/ffxiv/t...-Endgame-Guide - Scroll down to Cul and you'll see new information.
http://na.ff14angler.com/ - Awesome site for fishing and weather.
Tugs - Each set of fish has 1 0f 3 type of tugs. Light, Medium, Heavy.
Example: Octomamath - Medium tug will only produce Coral Butterfly and Harbor Herring so you should ignore a light tug to save time. Pill Bug > Med tug > Harring Harbor -Massive/Heavy Tug = Octomammath. If there is no massive tug you can let the fish go to save time as it will only be a blue octo.
Olgoi-Khorkhoi (Heatwave)- Sand Leech - Medium Tug - Storm Rider - Massive Tug - Caravan Eel > Olgoi-Khorkhoi. If no massive tug it will always be a manta. Tugs are key to farming. Hopefully people can help with a tug guide in more detail as i listed. This guide has all the Two star fish i believe