Skip to content
Journal article

Estimation of size at sexual maturity: An evaluation of analytical and resampling procedures

Roa R, Ernst B, Tapia F ...see all

Fishery Bulletin, vol. 97, issue 3 (1999) pp. 570-580

  • 113


    Mendeley users who have this article in their library.
  • 89


    Citations of this article.
  • N/A


    ScienceDirect users who have downloaded this article.
Sign in to save reference


Size at 50% maturity is commonly evaluated for wild popula- tions, but the uncertainty involved in such computation has been frequently overlooked in the application to marine fisheries. Here we evaluate three pro- cedures to obtain a confidence interval for size at 50% maturity, and in gen- eral for P% maturity: Fieller’s analyti- cal method, nonparametric bootstrap, and a Monte Carlo algorithm. The three methods are compared in estimating size at 50% maturity (l50%) by using simulated data from an age-structured population, with von Bertalanffy growth and constant natural mortality, for sample sizes of 500 to 10,000 indi- viduals. Performance was assessed by using four criteria: 1) the proportion of times that the confidence interval did contain the true and known size at 50% maturity, 2) bias in estimating l50%, 3) length and 4) shape of the confidence interval around l50%. Judging from cri- teria 2–4, the three methods performed equally well, but in criterion 1, the Monte Carlo method outperformed the bootstrap and Fieller methods with a frequency remaining very close to the nominal 95% at all sample sizes. The Monte Carlo method was also robust to variations in natural mortality rate (M), although with lengthier and more asymmetric confidence intervals as M increased. This method was applied to two sets of real data. First, we used data from the squat lobster Pleuron- codes monodon with several levels of proportion mature, so that a confidence interval for the whole maturity curve could be outlined. Second, we compared two samples of the anchovy Engraulis ringens from different localities in cen- tral Chile to test the hypothesis that they differed in size at 50% maturity and concluded that they were not sta- tistically different.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

  • ISSN: 00900656
  • PUI: 29341969
  • SCOPUS: 2-s2.0-0032791350
  • SGR: 0032791350


Cite this document

Choose a citation style from the tabs below