Effect of methyl parathion on the susceptibilityof shrimp Litopenaeus vannamei toexperimental vibriosis

Diseases of Aquatic Organisms

J. F. Turnbull¹  A. Roque¹  L. Labrie¹  B. Gomez-Gil¹ 

关键词: Shrimp;    Vibriosis;    Methyl parathion;    Pesticide;   

DOI  :  10.3354/dao057265

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Following increasing calls for environmental safety over the past 2 decades, persistent pesticides are being replaced by more rapidly degradable products. However, even these pesticides can affect non-target species, and may be associated withslow growth and increased susceptibility to viral and bacterial infections. In this study, juvenile white shrimp Litopenaeus vannamei (also named Penaeus vannamei) were challenged by intramuscular injection with Vibrioparahaemolyticus after 4 d prior exposure to methyl parathion in feed pellets at 0.080 µg g^-1. The bacterial injection control group consisted of shrimp fed pellets containing the methyl parathion-carrier solvent acetonitrile. Threeadditional control groups comprised 2 sterile saline-injection groups fed pellets containing methyl parathion or acetonitrile prior to injection, and 1 uninjected group fed normal pellets. Cumulative mortalities were recorded on the 4th and 8th days, andthe presence of histological lesions was recorded on the 8th day. Cumulative mortalities were significantly higher in the group exposed to methyl parathion and bacteria on Day 8. Histological lesions, typical of vibriosis, were significantly associatedwith the injection of V. parahaemolyticus. The study provides strong experimental evidence that prior exposure to methyl parathion can increase the severity of Vibrio infections.

【 授权许可】

Unknown