I disagree with you there bro. They took the time to count the fish and the Spirit has John remember and write the number - i don't think it's insignificant. Counting words in King Jimmy may not get us anywhere but it's 153 in every language here, and we're not in some census in the book of Numbers. I think there's something potentially profound here if we can find it, something that fits with John's whole purpose in writing.
I don't believe there to be any symbolical significance, nor there to be a sign, but that it was recorded for historical purposes. Fisherman have their tales, the fish were numbered before Christ likely due to the fact of such a vast amount and the net did not break. No fish tales were forthcoming, but I believe this great catch did portend the vast amount of elect that the apostles would bring into the kingdom.
The Biblical Illustrator sheds some light on this:
"Joh_21:11. An hundred and fifty and three [ἑκατὸν πεντήκοντα τριῶν].—The Evangelist’s primary intention in reporting the number of the whole mass of great fishes was, manifestly, to render prominent the miraculousness of the fact that the net was nevertheless untorn. The trait that the number (153), as a number, is not symbolical, speaks very decidedly in favor of the historic truthfulness of the narrative in opposition to the assumption of its being a tradition (Strauss), or the work of an apocryphal narrator.
The attempt has indeed been made to construe the number materially as a symbolical one. Ammonius: The number 100=the Gentiles, 50=the Jews, 3=the Trinity. 10 Jerome and Köstlin: Oppian counted 153 species of fish, ergo the universality of species=the universality of the nations entering the net of the Gospel. “Which statement, as far as Oppian is concerned rests upon a mistake.”
Recently, some one has even, conceived it to be his duty to work out the name: of Simon [son of] Jonas, by means of numerical allegory (Theol. Jahrb. 1854, p. 135).
We do not consider the number as symbolical, but the numbering does appear to us in that light. The elect, who form the main element of the Church, are’ great and numbered fishes. And great and numerous as the elect of the congregated mass may be, they are not the ones who break the net Of the Church. It is the maxim of all the elect: first Christ, then the Church. John is moreover always fond of stating numbers; for instance, the 200 cubits, Joh_21:8; Joh_6:10, etc."
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It appears in the above we have always had those who are superstitiously minded attempt to make more out of the number than what is intended. The historical narrative was confirmed in the amount of fishes taken. The amount of fishes pulled in by Peter must have been an unbelievable amount captured in one net, hard for others to accept as an accurate account. The catch itself was, I believe, miraculous.
I do not believe Christ wants any of us to be superstitiously chasing numbers, counting chapters, verses &c, coming up with mathematical equations thereby which prove absolutely nothing. One whose mind is preoccupied with these things is wasting valuable time that could be spent on examining and understanding the Gospel, Christ, God's attributes &c and glorying in these things, expounding Scripture, not in searching for signs.