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Feeding Regime

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Post larval fitness parameters

Post Larva Acclimitation


Risk Management, Bio-security and HACCP Implementation


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Rhabdovirus disease of American penaeids, RPS.

Scientific name or taxonomic affiliation
A rhabdovirus that is cytoplasmic and contains ssRNA.

Geographic distribution
Hawaii and Equador. A virus wuth similarities to RPS and YHD but called Lymphoid organ virus (LOV) was reported from Penaeus monodon in Australia (Spann et al. 1995)

Host species
Penaeus vannamei and Penaeus stylirostris.

Impact on the host
RPS did not cause disease in shrimp following massive challenge and it caused no distinctive histopathology (other than changes to the lymphoid organ). RPS may not replicate in shrimp and may use them as a carrier host as it is very similar to certain fish rhabdoviruses in morphology and it replicated in a fish cell line.

Diagnostic techniques
Histology: The lymphoid organs of shrimp challenged with RPS had marked hypertrophy with numerous large hypertrophied nodules that were similar in structure to the "spheroids" in the lymphoid organ of shrimp infected with YHV, LPV, TSV and LOVV.

Electron Microscopy: RPV virons were observed in the cytoplasm of lymphoid organ cells of challenged shrimp that showed histopathology in this organ. This rhabdovirus is bullet-shaped and measures 45 160 nm.

Culture: The virus demonstrates cytopahtic effect in EPC (epithelioma papulosum cyprini), a fin fish cell line from carp.

Methods of Control

No known method of prevention or control.




Variables to be used in health evaluation

Health evaluation tests
Wet Mount Procedure . PL visual examination . Stress test for post larva . Gill examination . Mid-gut Examination . Stomach Contents Analysis

Shrimp Diseases
Hepatopancreatic parvo-like virus (HPV) . Reo-like virus (REO) . Lymphoid organ vacuolization virus (LOVV) . Taura Syndrome Virus (TSV) . You are here . White Spot Syndrome Virus (WSSV) . Infectious hypodermal and hematopoietic virus (IHHNV) . Baculovirus penaei (BP)
Bacterial Diseases
Vibriosis . Epicommensal fouling disease (filementous bacteria) . Necrotizing Hepatopancreatitis (NHP) . Black spot disease (BSD) . Mycobacteriosis
Fungal Diseases
Larval mycosis . Fusariosis
Haplosporidia . Gregarines . Cotton Disease
Black Gill Disease (BGD) Dissolved Oxygen Crisis Nitrogen Gas Bubble Disease

Disease control
Decreasing density, partial or early harvests . Drugs, chemicals and treatments . Sanitation