Question

In composite/polyculture fish farming, Catla, Rohu, and Mrigal are stocked together in the same pond primarily because of which underlying ecological principle?

A All three feed on the same food at the same water column, resulting in healthy competition
B They cannot survive without each other in the pond ecosystem
C They belong to different genera and therefore cannot naturally breed with one another
D They require completely different, separate pond systems for rearing
E They occupy different feeding niches (surface, column, and bottom feeders respectively), minimizing competition for food and space
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