Current methods to detect hepatopancreatic parvovirus (HPV) infection of penaeid shrimp depend on invasive techniques that require dissecting the organs infected by this virus. However, sacrificing valuable stocks in order to determine their HPV status can be a drawback in the case of breeding programs. A method was developed for HPV detection by applying a polymerase chain reaction (PCR) assay...

The influence of different drying methods on physical and nutritional properties of shrimp meat was investigated in this study. Peeled shrimps were dried separately using an air-oven dryer and a tunnel solar dryer. The drying profile of shrimp meat was determined in the two drying systems by monitoring moisture loss over the drying period. Changes in color, proximate composition, and rehydratio...

In the period from 1970-1990, the worldwide shrimp industry was dependent on post larvae (PL) from wild sources. Grow-out systems were relatively simple, water exchange rates were high and few disease agents were known. Diagnostic capability was low and antibiotics and chemical use was common. Explosive increase in global shrimp cultivation was accompanied by viral pandemics starting around 198...

Hepatopancreatic parvovirus (HPV) causes disease in several species of penaeid shrimp. Heavy infections may result in poor growth and reduced production for shrimp farmers. From one southern Thai shrimp pond with a high prevalence of HPV infection, 790 shrimp were sampled randomly and the hepatopancreas (HP) removed. Most HP were preserved in liquid nitrogen. However, every 10th HP (79 total) w...

Ž . The Taura syndrome TS is one of the viral shrimp diseases that has most affected cultivation of the shrimp Litopenaeus Õannamei in America. We analyzed the presence of TS, from its first detection in May 1995 in 75% of the shrimp farms of the Guasave district in Sinaloa State, Mexico, and its progressive spreading from the north toward the central and southern zones of the ́ state, to the di...

RNA interference (RNAi) has been shown to inhibit viral replication in some animals and plants. Whether the RNAi is functional in shrimp remains to be demonstrated. In vitro transcribed dsRNAs of YHV helicase, polymerase, protease, gp116, and gp64 were transfected into shrimp primary cell culture and found to inhibit YHV replication. dsRNA targeted to nonstructural genes (protease, polymerase, ...

Protein food modulates the activity of proteases of the midgut gland of Penaeus vannamei. Shrimp fed with food containing 15, 30 and 50% protein exhibited differences in trypsin and chymotrypsin activity and trypsin mRNA levels. Shrimp fed with 30% protein showed higher trypsin and chymotrypsin activities than those fed 15 or 50% protein. An additional paralogue trypsin was observed with electr...

The use of probiotic bacteria for controlling black disease in fairy shrimp, Branchinella thailandensis, was studied. The bacterial antagonistic activities were tested with Aeromonas hydrophila WS1 which is pathogenic to fairy shrimp. The crossstreak method showed that after 48 hours, Bacillus W120 was the strongest inhibitor of A. hydrophila WS1. Bacillus W120 was characterized and confirmed a...

Ingested pollutants may elicit digestive toxicity following incorporation into consumer tissues. This post-assimilatory toxicity may include tissue damage influencing synthesis of digestive enzymes, gut transit time and absorption of nutrients as well as pollutants by the gut epithelium. This study investigated impacts of chronic field exposure on gut residence time (GRT), feces elimination rat...

Prawn, shrimp and crabs sold in Japan are mostly imported from overseas. Detection of irradiated crustaceans is very important for quality assurance. In this study, we used ESR to detect radiation-induced radicals after irradiation of prawn, shrimp and crabs of major species. No radiation-induced radicals were detected in prawn (black tiger prawn) or shrimp (white leg shrimp). Radiation-induced...