[Oberon]

They switched because of the invention of farming, and the transition from hunting/gathering to agriculture.

If you're limited to stone age technology, it's easier to raise cows than fish. Farming cows means that you can feed your family fresh meat in large quantities in January and February. That's much easier than catching and salting a whole winter's worth of seafood during the summer, and tastes better, too.

[LibertyAndJusticeForAll]

This new breeding of Talapia fish is not a bad idea. And, Talapia tastes good too.
Maybe there's an unemployed freeper interested in a new business opportunity? There are quite a few links to be found on Talapia Aquaculture.

[mikesmad]

Actually, they did it for the children. The local genius decided that cow farts would lead to global warming so he instituted a plan to kill all methane producing animals. The local entrenpreneur decided to create a market for all of the stinking meat that was laying around. Thus was born the local butcher, the t-bone, the bar-b-que, and the tailgate party.

[ffusco]

Cows are walking refridgerators. Grazing animals self forage, produce milk, some produce wool, leather, milk and fertilizer for agriculture and some are pack animals and help till the soil. It seems that it was more economical for society to turn to animals instead of fish. The rise in agriculture was the first step towards civilization. Growing foodleads to surplus wich encourages specialization among former hunter gatherers, surplus leads to trade among humans and the need to keep records. Records lead to a written language, math skills, the need to schedulel planting and harvest. A weritten language leads to a written history or culture that is not oral. So each person needs not learn everything that has come before. He can learn what he needs to acomplish his goals.

[Age of Reason]

They switched because of the invention of farming, and the transition from hunting/gathering to agriculture.

If you're limited to stone age technology, it's easier to raise cows than fish.

I suspect overpopulation had a hand in this.

Farming is much more work than hunting, fishing, or gathering--that is until overpopulation depletes naturally occurring food.

Then you are doomed to farming, warfare, pestilence, famine.

I prefer seafood, anyway.