Estimation of volatile organic compounds in farmed and wild rohu, Labeo rohita

Volatile organic compounds in farmed and wild rohu, Labeo rohita, were extracted by Likens-Nickerson concurrent distillation apparatus. The farmed raised rohu. of two weight categories designated as FW(1) (1001-1200g) and FW(2) (501-700g) were procured from the Fish Seed Hatchery, Faisalabad. Concurrently, wild rohu of two weight categories designated as WW(1) (1001-1200g) and WW(2) (501-700g) were captured with gillnet from the Trimu Head. Quantitative and qualitative estimation was made by gas chromatography. In farmed and wild L. rohita of the weight group FW(1) and WW(1), 14 and 6 volatile compounds were extracted, respectively. In weight group FW(1), six compounds were identified as 3-methyl-1-butanol, 3-hexene-1-ol, heptanal, 3-octanol, decanal and 2-undecanone. In weight group WW(1), out of six compounds three were identified as heptanal, 1-octen-3-ol, 2-nonanone. In weight categories FW(2) and WW(2), 14 and 13 volatile compounds were detected, respectively. In weight category FW(2), out of 14 compounds, 3-hexene-1-ol, heptanal, 3-octanol, 2-undecanone and decanal were identified. In weight category WW(2), out of 13 compounds, 7 were identified as 3-methyl-1-butanol, 2-heptanone, heptanal, 3-octanol, 2-nonanone, decanal and 2-undecanone. The analysis of variance for retention time and concentration of volatile compounds showed no significant difference (P>0.05). The correlation coefficient between retention time and concentration was significant (P<0.05).