Optimum sample size for a program of observers on board fishing vessels targetting Peruvian anchovy (Engraulis ringens)

Authors

  • Rocío Joo IMARPE, Instituto del Mar del Perú, Esquina Gamarra y General Valle S/N, Chucuito, Callao, Perú.
  • Daniel Grados 1 IMARPE, Instituto del Mar del Perú, Esquina Gamarra y General Valle S/N, Chucuito, Callao, Perú. 2 Institut de Recherche pour le Développement (IRD), Centre de Recherche Halieutique Méditerranéenne et Tropicale, Avenue Jean Monnet, BP 171, 34203 Sète Cedex, France.
  • Marilú Bouchon IMARPE, Instituto del Mar del Perú, Esquina Gamarra y General Valle S/N, Chucuito, Callao, Perú.
  • Erich Díaz IMARPE, Instituto del Mar del Perú, Esquina Gamarra y General Valle S/N, Chucuito, Callao, Perú.

DOI:

https://doi.org/10.15381/rpb.v23i2.12429

Keywords:

sample size, simulations, on-board observers, purse-seine pelagic fishery, anchovy Engraulis ringens.

Abstract

Monitoring the anchovy fishery is of great importance for assuring the sustainability of the Humboldt ecosystem. The on-board observers program constitutes a rich platform for data collection for monitoring, as it consists of the collection of data from vessels during their fishing trips, regarding catches, size distribution, discards, catch per unit of effort, among others. To get robust indicators from these data, it is necessary to use a solid statistical procedure for computing the number of fishing trips to sample. This work presents a method with those characteristics, for computing each indicator independently and at different time scales. We show that the optimum size varies depending on the objective (indicator) and the time scale. Based on these results, practical recommendations for fixing the sample size are given. We finally discuss the aplicability of this methodology for other pelagic resources.

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Cebus albifrons aequatorialis [Cindy M. Hurtado©]

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Published

08/27/2016

Issue

Vol. 23 No. 2 (2016)

Section

Articles

License

Copyright (c) 2016 Rocío Joo, Daniel Grados, Marilú Bouchon, Erich Díaz

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

AUTHORS RETAIN THEIR RIGHTS:

a. Authors retain their trade mark rights and patent, and also on any process or procedure described in the article.

b. Authors retain their right to share, copy, distribute, perform and publicly communicate their article (eg, to place their article in an institutional repository or publish it in a book), with an acknowledgment of its initial publication in the Revista Peruana de Biologia.

c. Authors retain theirs right to make a subsequent publication of their work, to use the article or any part thereof (eg a compilation of his papers, lecture notes, thesis, or a book), always indicating its initial publication in the Revista Peruana de Biologia (the originator of the work, journal, volume, number and date).

How to Cite

Joo, Rocío, Daniel Grados, Marilú Bouchon, and Erich Díaz. 2016. “Optimum Sample Size for a Program of Observers on Board Fishing Vessels Targetting Peruvian Anchovy (Engraulis Ringens)”. Revista Peruana De Biología 23 (2): 169-82. https://doi.org/10.15381/rpb.v23i2.12429.