For example, you’d imagine 2 to 3 chickens and 11 to 12 farmed fishes, in misery, hanging around each human, on average (at any given moment).
You could also imagine each person slaughtering a chicken every ~40 days and a farmed fish about once a month.
This is the global average, and the vast majority of farmed chickens and fishes are factory farmed. The numbers should be at least a few times higher in developed countries on average, since animal product consumption is higher. On their welfare, see this report, which of course involves subjective judgements.
In developed countries, usually at least 20 farmed land animals are raised for food per person per year on average.
I left a related comment here. Specifically:
This is the global average, and the vast majority of farmed chickens and fishes are factory farmed. The numbers should be at least a few times higher in developed countries on average, since animal product consumption is higher. On their welfare, see this report, which of course involves subjective judgements.
In developed countries, usually at least 20 farmed land animals are raised for food per person per year on average.