Oxygen consumption of Litopenaeus vannamei juveniles in heterotrophic medium with zero water exchange

Abstract

-This work aimed at determining the dissolved oxygen consumption rate of Litopenaeus vannamei juveniles maintained in a microbial biofloc raceway system at high density with no aeration. Three 4 L bottles were filled for each treatment, sealed hermetically, and placed in an enclosed greenhouse raceway system. Four shrimp (13.2±1.42 g) were assigned to two sets of the bottles, which underwent the following treatments: light conditions with no shrimp; dark conditions with no shrimp; light conditions with shrimp; and dark conditions with shrimp. Dissolved oxygen content was measured every 10 min for 30 min. A quadratic behavior was observed in dissolved oxygen concentration over time. Significant differences for oxigen consumption were observed only at 10 and 20 min between shrimp maintained in the dark and those under light conditions. At 10 min, a higher value was observed in shrimp maintained under light, and at 20 min, in the dark. Significant differences between 10 and 20 min and between 10 and 30 min were observed when oxygen consumption was analyzed over time in the presence of light. Under dark conditions there were significant differences only between 20 and 30 min. Lethal oxygen concentration (0.65 mg L -1 ) would be reached in less than one hour either under light or dark conditions with no aeration. Index terms: Litopenaeus vannamei, high density, microbial biofloc, oxygen consumption, raceway system. Consumo de oxigênio de juvenis de Litopenaeus vannamei em meio heterotrófico sem renovação de água Resumo -O objetivo deste trabalho foi determinar o consumo de oxigênio dissolvido (OD) de juvenis deLitopenaeus vannamei mantidos em sistema de cultivo de bioflocs bacterianos em alta densidade e ausência de aeração. Três garrafas de 4 L foram preenchidas para cada tratamento, fechadas hermeticamente e colocadas em sistema de cultivo fechado. Quatro camarões (13,2±1,42 g) foram colocados em dois dos conjuntos de garrafas. Os tratamentos aplicados foram: luminosidade, sem camarões; escuro, sem camarões; luminosidade, com camarões; escuro, com camarões. A concentração de oxigênio dissolvido foi determinada a cada 10 min durante 30 min. Foi observado um comportamento quadrático na concentração de OD ao longo do tempo. Diferenças significativas para consumo de oxigênio foram observadas apenas aos 10 e 20 min entre camarões mantidos no escuro e camarões em luminosidade. Aos 10 min, foi observada maior concentração no sistema mantido em luminosidade e, aos 20 min, no sistema mantido no escuro. Na análise do consumo de oxigênio ao longo do tempo e com luminosidade, foram constatadas diferenças significativas entre 10 e 20 min e entre 10 e 30 min. Em condições de escuridão, houve diferença significativa apenas entre 20 e 30 min. Concluiu-se que, sem aeração, a condição anóxica pode ser alcançada em menos de uma hora, tanto ao dia quanto à noite. Termos para indexação: Litopenaeus vannamei, alta densidade, biofloc microbiano, consumo de oxigênio, sistema de fluxo contínuo.

The importance of behaviour in improving the production of shrimp in aquaculture

“…; Vinatea et al . ). Lethal DO levels for L. vannamei are between 0.2 and 1 mg L −1 (Hopkins et al .…”

“…biofloc systems can maintain nitrogenous compounds at safe levels) (Vinatea et al . ; Maicá et al . ).…”

The contribution of diatoms to bioflocs lipid content and the performance of juvenileLitopenaeus vannamei(Boone, 1931) in a BFT culture system

“…In this kind of system, the water quality is maintained and an additional food source for the farmed organisms is provided (De Schryver, Crab, Defoirdt, Boon & Verstraete ). This system facilitates the production of aquatic animals at high stocking densities in a sustainable and bio‐secure fashion (Vinatea, Gálvez, Venero, Leffler & Browdy ), reducing feed costs and improving shrimp growth rate (Wasielesky, Atwood, Stokes & Browdy ; Otoshi, Moss & Moss ). Little is known about how to maintain microalgae in these systems with high concentration of suspended material and reduced light, and with regard to their influence on the performance of farmed shrimp.…”

Pengaruh Bioremediasi Terhadap Pertumbuhan Udang Vannamei(litopenaeus Vannamei)yang Dipelihara Dalam Bak Beton

“…Konsentrasi oksigen terlarut dalam media ini bergantung pada beberapa faktor diantaranya suplai oksigen dari aerator dan proses metabolisme organisme yang dibudidayakan. Konsentrasi oksigen terlarut (DO) pada budidaya udang vannamei intensif pada kondisi terbuka idealnyaa diatas 4,0 mg/L, sedangkan pada kondisi tertutup atau malam hari harus lebih tinggi dari 4,2 mg/L (Vinatea et al, 2009). Hal ini berarti DO pada penelitian ini masih optimal untuk kehidupan udang.…”