Preferred term

abundance estimate

Is replaced by

[Daniel C. Dauwalter] Abundance estimation is an integral part of understanding the ecology and advancing the managementof fish populations and communities. Mark-recapture and removal methods are commonly used toestimate the abundance of stream fishes. Alternatively, abundance can be estimated by dividing thenumber of individuals sampled by the probability of capture...

http://vocabs.lter-europe.net/EnvThes/msa0005