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Combined effect of body weight, temperature and salinity on shrimp Litopenaeus vannamei oxygen consumption rate

Abstracts

Aiming to optimize the calculations of mechanical aeration requirements in Litopenaeus vannamei marine shrimp cultures, oxygen consumption was quantified in combined conditions of temperature (20, 25 and 30ºC) and salinity (1, 13, 25 and 37 ‰) at three body weights (2, 6 and 12 g) for juvenile L. vannamei. To measure oxygen consumption, shrimps were placed in a semi-open respirometry system. Results demonstrate that temperature, salinity, shrimp size and the interaction of these parameters significantly influence the specific oxygen consumption (mg O2 g-1 h-1). The 2-g shrimp perhaps suffered osmotic stress and consumed more oxygen at salinity 37 ‰, whereas 6 and 12-g shrimp suffered such stress at salinity 1 ‰. At 25 and 30ºC oxygen consumption was more stable at salinities 13 and 25 ‰ for all groups. At 20ºC and salinity below 25 ‰ oxygen consumption was higher, possibly due to the reduced hyperosmoregulatory ability in lower temperatures. The resulting regression equations allowed the calculation of L. vannamei shrimp oxygen consumption at the temperatures, salinities and sizes tested in this study. The equations can be used for the estimation of the environmental capacity and also the mechanical aeration requirements to secure ideal levels of oxygen in L. vannamei culture systems.

Oxygen consumption; Temperature; Salinity; Litopenaeus vannamei


Com o objetivo de aperfeiçoar os cálculos a cerca da necessidade de aeração mecânica em sistemas de cultivo de camarão marinho Litopenaeus vannamei, foi quantificado o consumo de oxigênio em condições combinadas de temperaturas (20, 25 e 30ºC) e salinidades (1, 13, 25 e 37 ‰) para juvenis de L. vannamei com três tamanhos diferentes (2, 6 e 12 g). Para medir o consumo de oxigênio por animal foi utilizado um sistema de respirometria do tipo semi-aberto. Os resultados evidenciaram que a temperatura, salinidade, peso do animal e a interação dos três fatores influenciam significativamente o consumo de oxigênio específico (mg O2 g-1 h-1). Animais menores (2 g) possivelmente sofreram estresse osmótico com maior consumo de oxigênio em salinidades de 37 ‰, enquanto que em animais maiores (6 e 12 g) este estresse foi observado em 1 ‰. Em temperaturas de 25 e 30ºC o consumo apresentou-se mais estável em 13 e 25 ‰ em todos tamanhos analisados, sendo que em 20ºC o consumo abaixo de 25 ‰ foi maior, possivelmente devido ao comprometimento da capacidade hiperosmorregulatória em baixas temperaturas. Com base nos resultados encontrados, foram obtidas equações de regressão que permitem calcular o consumo de oxigênio de L. vannamei para as diferentes combinações de temperaturas, salinidades e tamanhos avaliados neste trabalho. Estas equações podem ser empregadas em cálculos de capacidade suporte dos ambientes de cultivo, bem como em cálculos a cerca da quantidade de aeração mecânica necessária para manutenção de valores ideais de oxigênio dissolvido nos sistemas de produção de L. vannamei.

Consumo de oxigênio; Temperatura; Salinidade; Litopenaeus vannamei


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Publication Dates

  • Publication in this collection
    15 Jan 2010
  • Date of issue
    Dec 2009

History

  • Reviewed
    11 May 2009
  • Received
    30 Sept 2008
  • Accepted
    01 Aug 2009
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