Abstaining from meat is an act of remembrance in two ways.
The first, of course is being thoughtful each week, that every Friday commemorates the death of Jesus in our preparation to receive Him in Eucharist.
The second, is a remembrance of the poor, who rarely eat meat. It’s a weekly call to give time, talent and treasure to the poor.
"The fish symbol was used in the Early Church as a representation of Christ:
Some Christians believe that a second link between their religion and the fish symbol is seen in the Greek word for fish (ichthus, spelled: Iota Chi Theta Upsilon Sigma).
That is an acrostic which has many translations in English.
The most popular appears to be “Jesus Christ, Son of God, Savior”
[Iesous (Jesus) CHristos (Christ) THeou (God) Uiou (Son) Soter (Savior)].
Alternative meanings (in order of decreasing popularity on the Internet) are:
“Jesus Christ, God’s Son, Savior.”
“Jesus Christ, of God, the Son, the Savior”
“Jesus Christ, the Son of God, Savior.”
“Jesus Christ, God’s Son, our Savior”
“Jesus Christ God Son Savior”
An acrostic is an “arrangement of words in which the first letter of each line ordinarily combines with others to form a word or words or the alphabet.”
The Apostles were often referred to as “fishers of men”.
Followers of Christianity were called Pisciculi; the root of this Latin word is “fish”.
The symbols of “sacramental fish, with wine and a basket of bread represents the Eucharist and the Last Supper in Christian art.”
The symbol was simple to draw and was often used among Christians as a type of password during times of persecution by the Roman government. If two strangers met and were unsure whether each other was a Christian, one would draw an arc in the earth ). If the other were a Christian, they would complete the symbol with a reverse arc: (), forming the outline of a fish.
According to Albatrus.org: “When threatened by Romans in the first centuries after Christ, Christians used the fish [symbol to] mark meeting places and tombs, or to distinguish friends from foes.”"