Showing posts from June, 2017

Bacterial disease of Shrimp

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 sp. es

An overview of L. vannamei shrimp aquaculture

Litopenaeus vannamei   is the most commonly cultured shrimp in Latin America and Southeast Asia, representing over 90 % of total shrimp production. India with its 8,118 km of coastline and 1.24 million Ha of brackish water area is the second shrimp producer in the world, with Andhra Pradesh being India’s largest vannamei farming area. Andra Pradesh, situated on the southern coast of the country, has 974 km of coastline and 175,000 Ha of brackish water. Andhra Pradesh has gradually increased its share in total marine exports of the country, with the United States and Vietnam as the main export markets. Currently, the state’s  L. vannamei aquaculture  is facing different issues and challenges to achieve sustainability related to diseases outbreaks, lack of availability of quality seed, high feed costs, unauthorized farming, international price fluctuations, less demand in the domestic market, and others. If farmers implement Better Management Practices (BMP) and  biosecurity  in L. v