It seems to expect ocean fishing to top out at 100 million tons per year. It is also less optimistic about aquaculture, pointing out that present aquaculture gets some of the protein required from ocean fish like menhaden that aren't eaten by people. My own opinion is that aquaculture will continue to grow. As for ocean fishing there are large possibilities of ocean fertilization that have not yet been experimentally explored. See iron fertilization for a discussion that is mainly oriented to iron fertilization as a way of absorbing CO2, but it can also increase fish populations.
Web page contains excellent agricultural statistics from all countries.
It is in a form suitable for on-line reading and also for downloading into spreadsheets. It expresses a strongly liberal viewpoint, advocating international entitlement programs, etc. and concentrating entirely on institutional matters and with no direct discusssion of agricultural technology. Maybe it can be regarded as putting an upper bound on the problem as seen by the international community. If it was the Meadows's, I wouldn't believe it. It reports various opinions on the sustainability of agricultural progress.