What does John 21:8 mean?

Jesus sent the disciples back to Galilee after His resurrection (Matthew 28:9–10). Although most of the men had been fishermen (John 1:35–42), this does not mean Jesus intended them to go back to their old career. Early in their travels, Jesus had miraculously provided a massive catch of fish (Luke 5:5–8), then told the disciples they'd now be "fishers of men" (Luke 5:10–11).

For whatever reason, Peter and six other disciples had gone out to fish overnight and caught nothing (John 21:1–4). A man appeared on shore and told them to cast once more, resulting in another enormous haul (John 21:5–6). This left no doubt that the man was Jesus, so Peter jumped overboard and swam to shore (John 21:7). The remaining men, including John himself, are left to tow the boat to shore.