Nitrogen dynamics model in zero water exchange, low salinity intensive ponds of white shrimp, Litopenaeus vannamei, at Colima, Mexico

Abstract

ABSTRACT. We present a mathematical model based on differential equations describing the dynamics of nitrogen (NH 4 + , NO 2 -, NO 3 -and organic nitrogen in phytoplankton) in ponds of white shrimp (Litopenaeus vannamei), with low salinity and zero turnovers, from planting to harvest. The model predicts the results of commercial production in three ponds. We show that this culture system, without replacement, retains the nitrogen and shrimp produced a lower feed conversion in comparison with systems with replacement. The model can be used to define strategies for improved performance. Keywords: white shrimp, dynamical model, nitrogen, low salinity, Colima, Mexico.Modelo de dinámica del nitrógeno en estanques de cultivo intensivo, con baja salinidad y sin recambio de agua, de camarón blanco, Litopenaeus vannamei, en Colima, México RESUMEN. Se presenta un modelo matemático de la dinámica del nitrógeno (NH 4 + , NO 2 -, NO 3 -y nitrógeno orgánico en fitoplancton) en estanques de camarón blanco (Litopenaeus vannamei) en condiciones de baja salinidad y sin recambio de agua. El modelo predice los resultados de producción comercial en tres estanques comerciales. Se demuestra que este sistema de cultivo, sin reemplazo, retiene el nitrógeno y los camarones producidos tienen una baja conversión de alimento en comparación con sistemas con recambio. El modelo se utiliza para evaluar mejores estrategias de manejo de estos ambientes. Palabras clave: camarón blanco, modelo dinámico, nitrógeno, baja salinidad, Colima, México.

Effect of the addition of diatoms (Naviculaspp.) and rotifers (Brachionus plicatilis) on water quality and growth of theLitopenaeus vannameipostlarvae reared in a biofloc system

“…Higher concentrations of nitrate in a biofloc system with microalgae addition, as compared to nitrite and total ammonia nitrogen, were also observed by Martins et al . (), because heterotrophic and nitrifying bacteria are the main factors responsible for the transformation of total ammonia nitrogen and nitrite in a biofloc system (Castillo‐Soriano, Ibarra‐Junquera, Escalante‐Minakata, Mendoza‐Cano, Ornelas‐Paz, Almanza‐Ramírez & Meyer‐Willerer ). The alkalinity and pH levels in the culture water were within the range recommended for biofloc shrimp culture (Furtado, Poersch & Wasielesky ).…”

Water quality,Vibriodensity and growth of Pacific white shrimpLitopenaeus vannamei(Boone) in an integrated biofloc system with red seaweedGracilaria birdiae(Greville)

“…() observed a negative effect of seaweed stocking biomass for TAN and DIN removal. In biofloc systems, heterotrophic and nitrifying bacteria are the main factors responsible for the transformation of TAN and NO 2 ‐N (Castillo‐Soriano, Ibarra‐Junquera, Escalante‐Minakata, Mendoza‐Cano, Ornelas‐Paz, Almanza‐Ramírez & Meyer‐Willerer ). In addition, NO 3 ‐N was the main form of inorganic nitrogen in the tanks, followed by NO 2 ‐N and TAN which facilitates its removal, since NO 3 ‐N and NH 4 + are the main forms of inorganic nitrogen removed by red seaweed (Abreu, Pereira, Buschmann, Sousa‐Pinto & Yarish ).…”

Dynamics and succession of plankton communities with changing nutrient levels in tropical culture ponds of whiteleg shrimp

“…The build-up of phosphorus might have stimulated the peaking of diatom production (Fig. 2) in the presence of adequate nitrogen towards the end of culture, as has also been observed by Stickney (2005) and Castillo-Soriano et al (2013). Interestingly, few studies have reported a dominance of cyanophytes coupled with a high phosphate concentration (Yusoff et al 2002, Shaari et al 2011.…”