The impact of oxygen consumption by the shrimp Litopenaeus vannamei according to body weight, temperature, salinity and stocking density on pond aeration: a simulation

Luis Vinatea,Walter Muedas,Rafael Arantes

doi:10.4025/actascibiolsci.v33i2.7018

Abstract

A simulation was conducted to determinate the impact caused by the combination of Litopenaeus vannamei respiratory rate (mg O2 shrimp-1 h-1), the behavior of SOTR (kg O2 h-1) of mechanical aerators as a function of salinity, as well as the oxygen consumption rate of the pond water and soil (mg O2 L-1 h-1) on the aeration of shrimp ponds (1, 10, 50 and 100 ha) stocked with different densities (10, 40 and 120 shrimp m-2), salinities (1, 13, 25 and 37 ppt), temperatures (20, 25 and 30°C), and shrimp wet weight (5, 10, 15 and 20 g). Results showed that under lower salinity, with larger shrimp, and higher stocking density, higher will be the quantity of required 2-HP aerators to keep dissolved oxygen over 50% saturation. In addition, under low salinity, with 5 and 10 g shrimp, independent of stocking density, more aerators per hectare are required and electricity cost is higher at 20°C and salinity 1 ppt. Less aerators and lower electricity cost was observed at 30°C, salinities of 25 and 37 ppt, and shrimp of 15 and 20 g.

Highlights

Intensification of aquaculture in general has caused higher oxygen demand in the culture units and, in the number of aerators needed to fulfill satisfactorily the organisms demands (BOYD, 1998; HOPKINS et al, 1991)
The objective of the present study was to analyze the impact of shrimp oxygen consumption, body weight, temperature, salinity, and stocking density on the number of aerators required in Litopenaeus vannamei culture ponds at densities of 10 to 120 shrimp m-2
Based on the calculation of shrimp oxygen consumption rate, as a function of salinity, temperature, stocking density and wet weight (Table 2), we verified that the combined effect of salinity and temperature on respiration rate is transferred to the consumption parameter, corroborating to findings by Bett and Vinatea (2009)

Summary

Introduction

Intensification of aquaculture in general has caused higher oxygen demand in the culture units and, in the number of aerators needed to fulfill satisfactorily the organisms demands (BOYD, 1998; HOPKINS et al, 1991). The bacterial decomposition of organic matter, which occurs in the sediment, consumes a significant part of the dissolved oxygen available for respiratory processes (AVNIMELECH; RITVO, 2003). Phytoplankton can be pointed out as the main responsible for the consumption of great part of the oxygen in the water (BOYD, 1990; GARCIA; BRUNE, 1991; MADENJIAN et al, 1987). Critical concentrations of oxygen can be reached after a massive phytoplankton mortality and subsequent decomposition (CHANG; OUYANG, 1988). Boyd (1989) reports that the adverse effects of low oxygen concentrations usually result in reduced growth and higher susceptibility to diseases Critical concentrations of oxygen can be reached after a massive phytoplankton mortality and subsequent decomposition (CHANG; OUYANG, 1988). Boyd (1989) reports that the adverse effects of low oxygen concentrations usually result in reduced growth and higher susceptibility to diseases

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Results