Dear Valentino,
I'm not sure if you are confused and I can't see your calendar or mine right now, so please forgive me if I make it worse.
On a strict Byzantine calendar, there would be no fish (vertebrates and with blood) eaten during the Great Lent but on Annunciation, Palm Sunday, (and possibly, Lazarus Saturday, but I don't think so).
During the rest of the year, the model is to fast from food (but not light drinks) on all Wednesdays and Fridays from the morning until breaking the fast at 3:00 PM by strict model, but as early as 1:00 PM, according to liturgical rubrics. During Great Lent, this model applies Mon-Fri, but if one can not keep five days like this, then try to keep the Wed and Fri.
Certain weeks have no fasting on Wed & Fri. They are after Pascha, Nativity, Pentecost and two weeks prior to Lent.
See earlier posts regarding the model. I think that my offering was on page 2, but all of the postings in this thread were excellent, healthy, and delicious!
In Christ,
Andrew.