Shrimp Farming

Rickettsial Infections This infection is not recorded yet from Indian waters, systemic rickettsial infections were reported from cultured P. monodon from Malaysia and Singapore. In P. monodon, the rickettsia occurred within large cytoplasmic vacuoles where it formed-microcolonies of 19 to 33 f.lm in diameter. In heavy infections, cells with rickettsial inclusions were widespread in mesodermally and ectodermally derived tissues, but absent in endodermally derived tissues such as midgut, hepatopancreas and caeca. Experimental treatment using medicated feeds containing 1.5 to 2. 0 kg of oxytetracycline per 1000 kg  offered  was found to be successful in reducing monalities. Vibriosis Vibrio sp. were found to constitute the predominant normal microflora of the culturable species of shrimps. Due to their rich presence in the shrimp's microflora, researchers have found Vibrio sp. as frequent and opponunistic pathogen of the shrimps. The opponunistic pathogenic Vibrio s...

Disease challenge by viruses, bacteria, fungi and toxic algae presents a major threat to profitable aquaculture production. Biosecurity, in other words reducing the number of infectious organisms in the aquaculture environment, is the most effective form of protection. Biosecurity is a set of management practices, which reduce the potential for the introduction, and spread of disease-causing organisms onto and between sites. Bio-security procedures, particularly disinfection and sanitation, should be combined with selection of pathogen-free seed and strategic treatments to either eradicate or reduce these pathogens to non-infectious levels. The Neospark Biosecurity Programme has been developed over many years with leading aquaculture producers around the nation. Neospark products and procedures have proven effective in practical farm conditions against a broad spectrum of pathogens. These include persistent and difficult to destroy immunosuppressive viruses causing WSSV, ...

Aquaculture is one of the fastest growing food-production sectors but the economic impact that parasites and bacterial, fungal and viral diseases have on the industry is highly significant for the many countries that rely heavily on this industry. Research into the diseases that affect penaeid shrimps that are grown in aquaculture systems is therefore vital, writes Bob Carling for TheFishSite. Two diseases that are currently being actively in Shrimp farming are: 1. The bacterial infection, Acute Hepatopancreatic Necrosis Disease (AHPND) – also called Early Mortality Syndrome (EMS) 2. The fungal infection, hepatopancreatic microsporidiosis caused by Enterocytozoon hepatopenaei (EHP). AHPND Acute Hepatopancreatic Necrosis Disease (AHPND) is a problem of the main countries that farm shrimps – China, Thailand, Vietnam and Malaysia. AHPND can occur in the first 30 days after stocking shrimp into ‘grow-out’ ponds, which is why AHPND is commonly, but ...

Application of Probiotics: Probiotic action is interceded by an assortment of impacts that are subject to the probiotic itself, the measurement utilised, treatment length and course, and recurrence of conveyance. A few probiotics apply their valuable impacts by expounding antibacterial atoms, for example, bacteriocins that straightforwardly repress other microbes or infections, effectively taking an interest in the battle against diseases, while others restrain bacterial development over the gut divider (translocation), improve the mucous obstruction work by expanding the generation of inborn insusceptible particles, or regulate the provocative/resistant reaction. A few studies have shown that example acknowledgment receptors (PRPs, for example, toll-like receptors (TLRs) flagging pathways, insusceptible reactions, and the emission of antimicrobial peptides, for example, defensins and chemokines by the epithelium assume essential parts in these instruments. Here are a few...

1. White Spot Disease (WSD) Pathogen : White spot syndrome virus (WSSV) Species affected :   Penaeus monodon   and   Litopenaeus vannamei   (10-85 DOC) Mortality rate : average to high, 100% in some cases within 10 d. Clinical signs : lethargic or moribund shrimps aggregated at pond surface and edges, slow to erratic swimming behavior, overall body color often reddish, minute to large (0.5-2.0 mm diameter) white inclusions embedded in the cuticle; Control measures : early harvest, strict isolation of infected ponds from movement, strengthened control of transportation, disinfection of infected ponds using Calcium hypochlorite (chlorine). 2. Yellowhead Disease (YHD) Pathogen : Yellowhead virus (YHV) Species affected :   Litopenaeus vannamei Mortality rate : could reach 100% in 2-5 days after infection. Clinical signs : Affected shrimps showed sudden increase in feeding activity and abnormal growth, then lo...