Aquaculture International

, Volume 22, Issue 3, pp 1025–1039 | Cite as

An evaluation of intraspecific competition for Pacific white shrimp Penaeus vannamei (Boone) in extensive/semi-intensive ponds

  • Bonny Bayot
  • Jenny Rodríguez
  • Wilfrido Arguello
  • María Herminia Cornejo-Rodríguez
  • Stanislaus Sonnenholzner
Article
  • 218 Downloads

Abstract

The hypothesis that intraspecific competition affects survival and growth during the culture and harvest at extensive/semi-intensive Penaeus vannamei shrimp ponds was evaluated. Thus, the effect of stocking density on the biomass, shrimp average weight, survival, and economic performance during the culture (133 days) and at the harvest of the P. vannamei shrimp was investigated in 400 m2 earthen ponds. In order to reduce the likelihood of infectious diseases, shrimp received preventive health treatments (probiotics and β-1,3/1,6-glucans) during all culture phases. In this way, the effect of density on the intraspecific competition for space/food was isolated. Ponds stocked at 6, 9, and 12 shrimp m−2 showed competition-dependent growth. Ponds stocked at 12 shrimp m−2 presented a mortality (12 %) between days 76 and 99. Competition, and accordingly individual growth reduction, could have begun at day 76 at a density of 5 shrimp m−2. Survival was significantly higher at 6 shrimp m−2 (84.2 ± 6.2 %) compared with the 12 shrimp m−2 (64.8 ± 12.4 %) treatment, while no significant differences in yield were observed between both treatments. Ponds stocked at 3 and 6 shrimp m−2 presented the best benefit–cost rates. The optimal shrimp density during the experimental culture was 5 shrimp m−2. Given the experimental conditions and considering the fraction of density-independent mortality observed, the optimum stocking density was found to be 6 shrimp m−2.

Keywords

B–N graph Extensive/semi-intensive ponds Intraspecific competition Optimal stocking density Pacific white shrimp Penaeus vannamei (Boone) 

Abbreviations

ANOVA

Analysis of variance

B

Biomass

B–N graph

Biomass–density graph

CENAIM

Centro Nacional de Acuicultura e Investigaciones Marinas

ESPOL

Escuela Superior Politécnica del Litoral

FCR

Feed conversion rate

N

Density

N5

Nauplii5

OSD

Optimal stocking density

PL

Postlarvae

SD

Standard deviation

WSD

White spot disease

WSSV

White spot syndrome virus

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Bonny Bayot
    • 1
  • Jenny Rodríguez
    • 1
  • Wilfrido Arguello
    • 1
  • María Herminia Cornejo-Rodríguez
    • 1
    • 2
  • Stanislaus Sonnenholzner
    • 1
  1. 1.Centro Nacional de Acuicultura e Investigaciones Marinas (CENAIM)Escuela Superior Politécnica del Litoral (ESPOL)GuayaquilEcuador
  2. 2.Instituto de Investigación Científica y Desarrollo Tecnológico (INCYT)Universidad Estatal Península de Santa Elena (UPSE)LibertadEcuador

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