Fisheries dictionary

INSTANTANEOUS RATE OF MORTALITY

The natural logarithm (with sign changed) of the survival rate. The ratio of number of deaths per unit of time to population abundance during that time, if all deceased fish were to be immediately replaced so that population does not change. Also called: coefficient of decrease.

  1. instantaneous rate of mortality—the natural logarithm with sign changed of the survival rate. The ratio of number of deaths per unit of time to population abundance during that time if all deceased fish...Dictionary of ichthyology