This investigation was carried out monthly between September 2005 to October 2006 with shrimp trawl that had mesh size of 24 mm in order to recognition, estimate the frequency and distribution of Penaeidae shrimp in Mahshahr creeks (Darvish, Doragh, Ghazaleh,Ghanam, Bi had, Patil and Zangi). A total of 1925 individuals which belonged to 3 species of Penaeidae family were captured. Their mixture composed of Metapenaeus affinis with 60.62%, Parapenaeopsis stylifera with 37.73%, and Penaeus semisulcatus with 6.65%. In this spescies female sex had more frequency than male. Maximum abundant also existed in June to August 2006 . Ghazleh creek had maximum abundant of shrimps . All species were in juvenile and pre-adult stages (had length range 44-129mm). However, based on ANOVA analysis, we observed significant differences between monthly frequency of shrimps (p≤0.05). Frequency of shrimps was higher in warm month.