In the Amazon Rainforest, hunter-gatherers (i.e. those who rely primarily upon hunting game and gathering wild plants for their subsistence) are generally classified as secondary hunter-gatherers.  This means that at one time they were primarily semi-sedentary horticulturalists, but abandoned their crops for a more mobile lifestyle.  As might be expected, these hunter-gatherers would tend to be more warlike and  "raid" horticultural gardens of other tribes.  In addition to hunting, they use a fish poison known as "huaca" in order to  fish.  Huaca is really a biodegradable method of stunning fish by depleting oxygen in the water rather than an actual toxin.  There are thousand of different species of fish in the Amazon River Basin and almost all of them are edible.