Suppose it wasn't humpback whales the crew needed to retrieve?
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Aside from snail darters or whales, what else could our crew have needed to bring back from 1986 to the 23rd century? (The plexiglass and water was necessary only because of the whales, Gillian Taylor was a bonus.) Serious answers, if possible.

The One About the Whales
For Earth Day 2020, a look back at one of our favorite movies.

An early story idea had not whales as the target of the probe, but the tiny snail darter — a fish roughly the length of two paper clips. It’d recently been discovered, and Bennett liked the very Star Trek-esque idea of something so small having such a big impact (as well as its potential for cost-savings in production). Humpback whales, though, were ultimately chosen. They’re grander and a better cinematic choice because of their size and elegance and distinctiveness from so many other sea creatures. They also play a critical role in the overall health of the marine ecosystem in their spot at the top of the oceanic food chain.
Aside from snail darters or whales, what else could our crew have needed to bring back from 1986 to the 23rd century? (The plexiglass and water was necessary only because of the whales, Gillian Taylor was a bonus.) Serious answers, if possible.
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