fa پژوهشي Orginal research papers The <em>Aphanius fasciatus</em> is a euryhaline and eurythermal fish, naturally present in many brackish water habitats little oxygen, along the Mediterranean coast, rarely in freshwater (Maltagliati, 1999). The species is endemic to the Mediterranean area, where it is found almost all coasts. Recently, Chaibi <em>et al</em>., (2015), reported the presence of the species in the northern part of the northern Sahara region, which widens the biogeographic area known distribution of the species, which was previously limited to coastal areas around the Mediterranean to continental habitats, including brackish water systems in the desert region of Algeria.&nbsp; Aphanius fasciatus, Ectoparasites, Population dynamics, Sahara Algeria. 435 442 http://jifro.ir/browse.php?a_code=A-10-1272-232&slc_lang=fa&sid=1 C. Ghazi ch-gh-eco@hotmail.com 100319475328460029519 100319475328460029519 Yes Department of Biology, Faculty of Nature and Life Sciences; and Sciences of the Earth and the Universe. University of Kasdi Merbah, Ouargla, Algeria. Department of Biology, Faculty of Nature and Life Sciences; and Sciences of the Earth and the Universe. University of Kasdi Merbah, Oargla, Algeria. A. Si Bachir 100319475328460029520 100319475328460029520 No Department of Ecology and Environment, Faculty of Nature and Life Sciences, University Batna 2, Batna, Algeria. Department of Ecology and Environment, Faculty of Nature and Life Sciences, University Batna 2, Batna, Algeria. F. Santoul 100319475328460029521 100319475328460029521 No EcoLab, Laboratoire d’Ecologie Fonctionnelle, University Toulouse III, France. EcoLab, Laboratoire d’Ecologie Fonctionnelle, UniversityToulouse III, France. R. Céréghino 100319475328460029522 100319475328460029522 No EcoLab, Laboratoire d’Ecologie Fonctionnelle, University Toulouse III, France. EcoLab, Laboratoire d’Ecologie Fonctionnelle, University Tolouse III, France.