April 3rd, 2024.

In the heart of the bustling market, I remain hidden, yet ever-present. I am the currency of the sea, the lifeblood of the fishing trade. My value is determined not only by my size, but by the skill and experience of those who seek me out. I embody the spirit of the ancient Japanese fishermen who braved the waters for generations, passing down their knowledge and traditions from father to son. To those who are willing to dive deep and navigate the rough currents, I hold the promise of great rewards. But for those who fail to understand my true worth, I will remain forever elusive. What am I?