Abstract
In previous studies focused on a nauplii stage of Artemia sp as a model to acute toxicity tests to detection of antifouling as an active agent against fouling marine organisms as Tributyltin Chloride (TBTCl). This research aims to investigate the toxicities of (TBTCl) on hatching dry cysts and morphological changes on newly nauplii of Artemia salina. The range of TBTCl concentration was selected (5, 10, 15, 20, 25, 50, 75, 100, 150, 200 ngl-1). The results showes TBTCl significantly reduced hatching percentages of A. salina cysts from the (5 to 200 ngl-1). The 200 ngl-1 TBTCl concentration showed no indication of hatching percentages among A. salina cysts. comparing with percentages in the control were 97%. The median effective concentration EC50 of TBTCl was (46.48 ngl-1). The survivors nauplii were used to study the effect TBTCl on morphological malformation as total length and body width of newly nauplii.