fa Ecology Ecology پژوهشي Orginal research papers <p dir="ltr" style="text-align: justify;">This paper presents the results of a parasitological study on internal parasitic infections in saposhnikovi shad, <em>Alosa saposchnikowii</em>, from the southern part of the Caspian Sea. In this regard 30 fish were studied for abdominal cavity parasites in February 2014. Results showed all of the specimens were infected at least with one kind of parasite and there was no significant difference in parasitic infections between males and females. According to the results three kinds of parasites including one trematode (<em>Pronoprymna </em><em>ventricosa</em>) and two kinds of nematodes (<em>Anisakis simplex</em> and <em>Eustrongylides </em>sp) were isolated from the abdominal cavity of the studied fish. 43.33 % of the specimens were infected with <em>A. simplex</em>, 96.66 % were infected with <em>P. </em><em>ventricosa</em> and 16.66 % of the specimens were infected with <em>Eustrongylides</em> sp. Intensity of infection to <em>A. simplex</em>, <em>P. </em><em>ventricosa</em> and <em>Eustrongylides </em>sp in saposhnikovi shad was calculated as, 3.46 &plusmn; 1.76, 131 &plusmn;16.78 and 2 &plusmn; 0.71, respectively. &nbsp;According to the results 33.33% &nbsp;intestine, 10% liver and 6.66% mesentery of specimens were infected with&nbsp; <em>A. simplex</em>, 26.66% stomach, 86.66% pyloric caeca and 66.66% intestine of studied fish were infected with <em>P. </em><em>ventricosa</em> and &nbsp;<em>Eustrongylides </em>sp was isolated in 13.33% mesentery and 3.33% liver of the specimens. &nbsp;It seems this is the first record of <em>A. simplex</em> and <em>Eustrongylides </em>sp infection from saposhnikovi shad in Iran. These parasites are important because of their pathogenicity in fish and zoonotic risk in human health care.</p> Trematode, Nematode, Parasites, Alosa saposchnikowii, Caspian Sea 1067 1077 http://jifro.ir/browse.php?a_code=A-10-1272-213&slc_lang=fa&sid=1 M. Mazandarani mazandarani@gau.ac.ir 100319475328460017014 100319475328460017014 Yes A.M. Hajimoradloo 100319475328460017015 100319475328460017015 No E. Niazi 100319475328460017016 100319475328460017016 No