In this context (IIRC) smart means “if this zip contains a single folder with contents, directly extract that folder, but if the zip contains files and/or folders, extract all that to a new folder named the same as the zip file”.

Some people zip folders while some people zip the files in a folder. Smart extraction just handles both automatically.

Apparently integrating fish like this reduces the methane emissions:

In California rice fields, golden shiner minnows introduced by the project have reduced methane coming off fallowed rice paddies by 64 percent.

https://www.wired.com/story/tiny-hungry-fish-fix-rice-global-warming-problem/