RD. Am I correct if one year with 1500MT will be... Gross margin $5.84 (14.58-8.74) for four month for one 0.54kg fish. 5.84 /0.54 = $10.81 /kg /4 month. $10.81 * 3 = $32.43 /kg /year And finally 1,500,000 * $32.43 = $48,645,000 Gross margin for one full time fish farm.