The mass present at a given time of a population of fish is called its:

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Standing stock refers to the total mass of a population of fish at a particular moment in time, regardless of their age or size distribution. While fish stock refers to the number of fish in a particular area or fishery, it is not a measure of their total mass. Maximum sustainable yield refers to the level of fishing that can be sustained over time without depleting the population, and recruitment mass refers to the mass of new individuals entering the population through reproduction. Diversity refers to the variety of species present in a particular ecosystem.

The Mass Present at a Given Time of a Population