The estimated total mortality rate of bombayduck, Harpodorl r~ehereus,at \ud Nawabunder varied between 2.443 and 2.939 for the period 1976-79. The Natural \ud mortality coefficient (M) was at 1.575 for the unexploited phase and 1.462 for \ud the exploited phase. Exploitation rate (u) was at 0.422. The MSY and the average \ud yield were close to each other as the estimated values were 3918.4 t and 3561.0 t, \ud respectively
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