These opportunistic fish have a high fecundity. A few adults can produce enough young to reach carrying capacity of the water body. Overcrowded fry will not get sufficient food to survive their first year. Mortality of older fish is independent of density. Growth of older fish is density dependent.
Fish caught are within a usable size range.
There is a reasonable possibility of catching a large fish. The above conditions persist through time. The prey species eats plants and invertebrates. It, in turn, provides food for the predator. This might work if everything was balanced and no other interactions existed.