So during those days you shouldn't eat fish since that is a loophole.
Very good point. If you believe fish is meat then you should not eat it even if your spiritual adviser says it is OK. They do draw the line at chicken.
Saint Thomas Aquinas
“Fasting was instituted by the Church in order to bridle the concupiscences of the flesh, which regard pleasures of touch in connection with food and sex. Wherefore the Church forbade those who fast to partake of those foods which both afford most pleasure to the palate, and besides are a very great incentive to lust. Such are the flesh of animals that take their rest on the earth, and of those that breathe the air and their products.”