Indar Widiastuti Rahayu, Rifky Rizkiantino, Beni Halalludin, Roffi Grandiosa Herman, Lantun Paradhita Dewanti, Iskandar -, Daniel Wisoyo, Putri Purnama Sari, Mufti Rahayu, Rachmawati Nur Fitriana, Bestran Virlando Panjaitan, Rubiyanto Widodo Haliman, Hendri Laiman


This study was aimed to observe the survival rate (SR) and clinical signs, and the acute immune response of Pacific white shrimp (Litopenaeus vannamei), including total hemocyte count (THC), bacterial clearance, and prophenoloxidase (ProPO) activity due to infection with the Vibrio parahaemolyticus bacteria and its metabolites. Shrimp were infected by bacterial isolates with culture media (A), bacterial isolates without culture media (B), and metabolites suspensions from bacterial culture media (C) for 8 hours with observation every 2 hours. The results showed that experimental shrimps in groups A and B showed clinical signs and reduced SR, 24.44% and 62.22%, respectively. Experimental group C still showed the clinical signs but did not cause the mortality (SR 100.00%). The THC did not show significant changes, either based on experimental groups or duration of infection, but all groups tended to show decreasing THC at 8 hours post-infection. Bacterial clearance and ProPO activity also did not show significant differences between experimental groups or duration of infection at 8 hours post-infection. However, there was an increase in bacterial clearance activity at 6 hours post-infection in the experimental groups A and B. Based on the study results, the acute immune response in shrimp from all of the experimental groups did not show significant changes at 8 hours post-infection. However, group A significantly decreased SR compared to groups B and C.


Acute Hepatopancreas Necrosis Disease, bacterial metabolites, immune response, Litopenaeus vannamei, Vibrio parahaemolyticus

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