See this article: https://thecounter.org/case-against-octopus-farming-cephalopod-aquaculture/
In essence, farming carnivores, such as octopi, may cause depletion of the fish they eat (which in some cases may be entirely wild-caught).
Also see this similar article about farming European eels .
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Migration barriers (from at least hydroelectric power) seem to be a huge aspect of their decline, however.
This article talks about the issue: https://triedandsupplied.com/saucydressings/sustainable-eel/
The article says this, "If you are looking to source eel sustainably, look out for the SEG and ESF logos."
Also see this similar article about farming octopi .
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