How we cite our quotes:
I stared and stared
and victory filled up (lines 64-65)
The speaker is so in awe of this fish, that she has given up the urge to "conquer" or "beat" him and sees this victory as belonging to the venerable fish. Also the victory could be the speaker's but in the sense that she was afforded the experience. In other words, the speaker feels lucky to have encountered such an amazing fish.