YOU SAID:

There can only be so many fish in the sea.

INTO JAPANESE

海にはたくさんの魚しかいません。

BACK INTO ENGLISH

There are only a lot of fish in the sea.

INTO JAPANESE

魚は海にはいくらでもいる。

BACK INTO ENGLISH

There are as good fish in the sea as ever came out of it.

INTO JAPANESE

魚は海にはいくらでもいる。

BACK INTO ENGLISH

There are as good fish in the sea as ever came out of it.