How does seeing the five old pieces of fishing line on the fish's jaw impact the speakers view of the fish in "The Fish"?

Whereas prior to this
the speaker sees the fish both as something to be feared and as something to catch, when the
speaker notices the evidence of all the other fishermen that the fish has outwitted or survived,
the attitude towards the fish is shown to change dramatically. Notice how the speaker talks
about the fish after noticing these...