a r t i c l e i n f o Recently, several groups of researchers reported that besides serine proteinases, other classes of proteinases may be involved in crustacean's food protein digestion, including cysteine and aspartic proteinases. In this paper, a comparative study of the class and type of digestive proteinases of whiteleg shrimp Penaeus vannamei, blue shrimp Penaeus stylirostris, and yellow...

The bacteria that cause necrotizing hepatopancreatitis in Penaeus vannamei adversely affect penaeid shrimp cultured in the western hemisphere. 16S rRNA and gyrase B gene analyses determined the taxonomic position of these bacteria. The name "Candidatus Hepatobacter penaei" is proposed for these pathogenic bacteria, which are members of the Rickettsiales order.

We report here the complete genome sequence of Vibrio campbellii, isolated from Penaeus vannamei cultured in a Latin American country. The Tn3-like transposon and pirAB genes were encoded on the plasmid pLA16-2. These data support the geographical variations in the virulence plasmid found among acute hepatopancreatic necrosis disease (AHPND)-causing Vibrio isolates from Latin America and Asia.

The present study describes the activity and some characteristics of proteinases in the hepatopancreas of red shrimp Pleoticus muelleri during the different stages of the molting cycle. Proteolytic activity was highest between pH 7.5 and 8. The hepatopancreatic protein content in the premolt stage was higher than in the other stages of the molting cycle (P<0.05). No significant differences were...

in current research relationship between eicosapentaenoic acid (epa) and docosahexaenoic acid (dha) (% of total fatty acids) in edible tissue (muscle) of green tiger shrimp (penaeus semisulcatus) and lobster (thenus orientalis) collected from persian gulf, was investigated with some biological factors (total length, total weight and sex). results showed that in all two species, epa and dha perc...