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AHPND is a chronic disease in Pacific white shrimp from Latin America

AHPND is a chronic disease in Pacific white shrimp from Latin America

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Friday, 21 August 2020 14:29

WORLDWIDE: Since 2009, Acute Hepatopancreatic

Necrosis Disease (AHPND) progressively spread as an epidemic, devastating shrimp production across much of the shrimp farming regions in Asia and eventually the Western Hemisphere, including an outbreak identified on a farm in the United States.

Previous estimates of the cumulative economic impact of AHPND have ranged from $8 billion (U.S.) for Asia and $4 billion for America. However, in recent years, shrimp production has improved in countries previously hard hit by AHPND, as farmers have tested, improved and adapted husbandry practices that mitigate important environmental risk factors; and as knowledge of the molecular features, detection methods and options for AHPND management have evolved.

The list of bacteria that can cause AHPND include: V. parahaemolyticus (VPAHPND), Vibrio campbellii, V. harveyi, V. owensii and V. punensis. The pathology of AHPND has two distinct phases. In the acute phase, the infected hepatopancreas shows detachment of tubule epithelial cells from the basement membrane and tubule epithelial degeneration in the absence of bacterial cells. In the terminal stage, the hepatopancreas shows extensive intra-tubular hemocytic infiltration and the development of massive secondary bacterial infection.

Anecdotal evidences suggest that in Latin America, AHPND might be present in several countries including Mexico, and through South America. Even though the Latin American strain of VPAHPND is also highly pathogenic, often VPAHPND does not cause acute mortalities, and, in the region, shrimp production has increased steadily during the last 10 years.

This article – summarized from the original publication [L.F. Aranguren Caro et al. 2020. Acute hepatopancreatic necrosis disease (VPAHPND), a chronic disease in shrimp Penaeus vannamei population raised in Latin America. Journal of Invertebrate Pathology, Vol. 174, July 2020, 107424] – reports on VPAHPND challenge trials conducted using Pacific white shrimp (Penaeus vannamei) in Aquaculture Pathology Laboratory (APL) following standard bioassay methodology, as well as assessments carried out to document histopathology and hepatopancreas heterotrophic plate count (HPC). Our results help explain the relative lack of acute mortalities observed at the shrimp farm level in Latin America..(Continue.. )

Source: FIS (Aquaculture Alliance)

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