Making specific reference to details or devices in the poem "A Display of Mackerel," discuss the author's view on the theme of individuality versus conformity as expressed through humans versus fish. Is "the price of gleaming" too high?

In the poem "A Display of Mackerel," Doty is posing a deep and focused philosophical question about conformity versus individuality when he writes:

Suppose we could iridesce,

like these, and lose ourselvesentirely in the universeof shimmer—would you want

to be yourself only,unduplicatable, doomedto be lost?

The speaker is, in essence, asking whether we would rather be a part of a beautiful group of something that all looks the same (the mackerel) or "be [ourselves] only," "unduplicatable, doomed to be lost." Here, he seems to fall on the side of conformity, choosing to lose himself "entirely in the universe of shimmer" rather than be an individual "doomed to be lost." Doty uses bright, beautiful words to describe the group, describing the fish as "each a foot of luminosity" with their "radiant sections / like seams of lead / in a Tiffany window." The "Tiffany window" refers to beautiful stained-glass windows. Grappling with the question of whether the "price of gleaming is too high," the speaker seems to think not, saying the mackerel are "all exact expressions / of the one soul / each a perfect fulfilment / of heaven's template," noting "how happy they seem, / even on ice, to be together, selfless / which is the price of gleaming."
https://www.poetryfoundation.org/poems/47251/a-display-of-mackerel