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In this work, we study the effect of habitat degradation and environmental stress on fluctuating asymmetry, a morphological parameter of the grass goby Zosterisessor ophiocephalus Pallas, 1811, sampled from eastern coasts of Tunisia. Ninety-six specimens of Zosterisessor ophiocephalus were collected during SeptemberNovember 2012 from two sites: one polluted (Khniss) and one control (Chebba) in eastern littoral zone of Tunisia. Six bilateral metric and two meristic characters were used to assess fluctuating asymmetry. Statistical analysis showed that assessed asymmetries are fluctuating. FA of sub-orbital and post-orbital distances, orbital diameter, and pelvic and pectoral fin lengths, are higher in polluted site compared to control. Chemical and organic pollution from sewage discharge seems to be responsible for this high FA. Many actions should be taken to save the khniss ecosystem: control the quality of waste water, push the current treatment of certain plants to tertiary treatment, act on the current discharge to improve the conditions of his release in sea and move rejection seaward to a minimum depth of 15 m to prevent pollution reaching the coast and for better dilution and dispersion of pollutants

sdrp journal of aquaculture, fisheries and fish science

Effect of pollution on the fluctuating asymmetry in the grass goby Zosterisessor ophiocephalus Pallas, 1811 as contamination indicator of Eastern Tunisia.