The manuals will give you neat numbers, but my uncle's one-acre pond taught us that the real cost is anxiety—a power cut at the wrong hour can wipe out a cycle. We calculated for Rohu and Katla, but the income depends more on who fixes the aerator and what the middleman decides that week. My father's loan papers are my real textbook; the density is how many sleepless nights you can stock per acre.
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