Volume 43, No. 02, Month MAY, Year 2019, Pages 52 - 65

Oxygen consumption rates of hybrid red tilapia at different sizes during challenge to water velocity

Jesada Is-haak, Methee Kaewnern, Ruangvit Yoonpundh, Wara Taparhudee

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This research was designed to determine the oxygen consumption (OC) rates of hybrid red tilapia at nine different fish sizes (fs 1-9), ranging from 110 g to 956 g, at five water velocities (wv) each with three replicates, ranging from 0 to 40 cm∙s-1 using respirometers. A 5X9 factorial experiment, in randomized complete block design, showed highly significant (p<0.01) effects of both fish size and water velocity, as well as the interaction between them. The OC rates were highest in the first hour, then sharply decreased (p<0.05) by the second hour, and remained stable in the third hour. OC was significantly reduced as fish size increased. Additionally, average OC for all fish sizes was highest at water velocity of 0 cm∙s-1 and decreased sharply at 10 cm∙s-1. Fish in size groups fs 1-2 had lowest OC (0.09-0.19 mg∙l-1∙h-1∙100 g-1) at 10-20 cm.s-1, fs 3-4 had lowest OC (0.05-0.11 mg∙l-1∙h-1∙100 g-1) at 10-30 cm∙s-1, while fs 5-9 had lowest OC (0.03 - 0.08 mg∙l-1∙h-1∙100 g-1) at 10-40 cm∙s-1. An estimated simulation equation of oxygen consumption was best fitted in the power regression: OC = 0.686 – 0.002fs∙wv + 1.732x10-5fs2∙wv + 1.661×10-6fs2∙wv2 - 7.879×10-6fs3 - 3.985×10-8fs∙wv3 + 8.686x10-7wv4, with R2 = 0.874.


Fish size, Hybrid red tilapia, Oxygen consumption rate, Water velocity


Published by : Faculty of Fisheries, Kasetsart University
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