The average age of the fish in a year-class at which the instantaneous rate of natural mortality equals the instantaneous rate of growth in weight for the year-class as a whole. At this age, the biomass of the age class is maximum. Also referred to as Critical age.
OPTIMUM AGE
Meaning of OPTIMUM AGE in English
Fishery English glossary. Английский глоссарий рыболовства . 2012