וַיְבָ֧רֶךְ אֹתָ֛ם אֱלֹהִ֖ים לֵאמֹ֑ר פְּר֣וּ וּרְב֗וּ וּמִלְא֤וּ אֶת־הַמַּ֙יִם֙ בַּיַּמִּ֔ים וְהָע֖וֹף יִ֥רֶב בָּאָֽרֶץ׃
上帝賜福給牠們,說:「要繁衍增多,充滿海中的水;飛鳥也要在地上增多。」
Rashi
ויברך אותם AND HE BLESSED THEM — Because people decreased their number, hunting them and eating them, they needed a blessing (Genesis Rabbah 11:2); it is true that beasts also were in need of a blessing, but on account of the serpent that was to be cursed in the future, He did not bless them, in order that it might not be included in the blessing.
Ibn Ezra
"and He blessed" - the meaning of "be fruitful and multiply" [i.e., command form] is "may you be fruitful and may you multiply". Likewise, "Die on the mountain" Deuteronomy 32:50, for this is not within his [Moshe's] power or at his behest.
Ramban
AND G-D BLESSED THEM SAYING. He decreed the blessing on them and said of them that they should be fruitful and multiply, meaning that they should bring forth abundantly, that one creature should bring forth many like itself. The purport of the blessing is procreation, even as it says, And I will bless her, and she shall be a mother of nations.191Genesis 17:16. In connection with plants also, the term “blessing” applies: Then I will command My blessing upon you in the sixth year.192Leviticus 25:21. However, it does not say so on the third day [when the plants and trees were created] because all created living beings were only a single pair, male and female, according to their kind, and therefore they were in need of a blessing to bring forth abundantly; but in the case of plants, they sprang up over the face of the entire earth in great abundance, just as they exist today. Nor did He mention a blessing on the sixth day for cattle and beasts because in the decree of abundancy which He decreed for the moving souls in the waters there were included the moving souls on the earth, as all living souls that do not speak are in the same class of creation. And our Rabbis have said193Bereshith Rabbah 11:2, and quoted here in Rashi. that they [the fish and fowl] were in need of a blessing because people hunt them and eat them.194“Beasts also were in need of a blessing [for the same reason, namely, that people decrease their numbers by hunting them and eating them], but on account of the serpent that was to be cursed in the future, G-d did not bless them, in order that it might not be included in the blessing. “ Rashi.