I understand this is not part of the question, but one suggestion which has been explored fancifully has to do with communication, namely telepathy.
Ok, so before you get out the torches and pitchforks, hear me out. :D
Following from my comments on the question, the answer is it depends.
I think one of the fundamental requirements for advanced civilization, and thus the technical and engineering capacity to resolve and ultimately propel the problem of obtaining enough meat to support a presumed critical mass of intelligence over all, is a function of network density in that the sharing of information is necessary to advance the sciences.
A number of suggestions have been made already, including societal structures and forms of production including aquaculture. But the core of the problem is invariably information and knowledge based.
We don't have evidence for telepathy, obviously, but we can suggest from what we know about information science, neuroscience, biology and even into quantum mechanics that it's perhaps not outside the realm of possibility. Consider sharks sensing electric fields and eels producing them and you're on the right track there.
We know that neurons are plug and play. These little cells care not what kind of information you give them, they simply grow toward and figure out how to differentiate signals. Macaques have been shown to cooperate to move a robot arm in a suprabrain activity in order to fetch and receive treats with the arm.
Furthermore, we also know that the brain is a complicated gizmo and it does some pretty amazing things, often things we're not aware of or kinds of thoughts, feelings or senses that fall just below our threshold of attention.
Again, not going fully creepy mode, but just genuinely questioning the nature of what is and the potential with regard to what we do know.
Obviously, and again without turning on the creepy tap. We're already voluntarily placing hardware into the brains of individuals with motor impairments and learning the language of neurons so we can explicitly reconnect it to synthetic body part replacements. The distance between that kind of technology and direct, conscious communication is perhaps smaller than it looks. We just shy away from it because it sets off all of our warning signals and fears about self and identity and privacy and so on.
So if you need a way to "get over the hump" of challenges which lead to advanced civilization under such constraints, this may be a good option to consider.