Impacts of acute hepatopancreatic necrosis syndrome
Research continues in the global efforts to identify the cause of acute hepatopancreatic necrosis syndrome in farmed shrimp and find solutions to stop the major losses caused by its spread.
The Queiroz Galvão Alimentos shrimp farm and hatchery in Brazil have been working with Concepto Azul to implement a disease-prevention and genetic-breeding program that addresses ongoing impacts from infectious myonecrosis virus (IMNV) and other pathogens.
Research continues in the global efforts to identify the cause of acute hepatopancreatic necrosis syndrome in farmed shrimp and find solutions to stop the major losses caused by its spread.
Since 2001, Moana Technologies has worked toward providing domesticated, genetically improved and specific pathogen-free (SPF) black tiger shrimp to farmers in Asia. Based in Hawaii, USA, Moana built a breeding base on wild-caught broodstock from seven locations in Asia.
In studies that used biofloc systems to culture channel catfish, culture tanks were susceptible to episodes of geosmin and 2-methylisoborneol and subsequent bioaccumulation of off-flavors in catfish flesh.
The Inter-American Tropical Tuna Commission Achotines Laboratory in southern Panama is the world’s only facility with nearly year-round availability of tuna eggs and larvae. A study is comparing the reproductive biology, genetics and early life history of yellowfin and Pacific bluefin tuna.
Since Taura syndrome virus was in the Americas when yellow head virus become pandemic in Asia, it is possible TSV prevented shrimp in the Western Hemisphere from infection by materials from Asia containing YHV. To test this idea, the authors evaluated the viral interactions in shrimp preinfected with TSV and then challenged with YHV.
In a laboratory trial, juvenile pangasius given a diet with 0.2 percent potassium diformate (KDF) had better weight gain, feed conversion and survival than fish that did not receive KDF.
Proper management of broodstock nutrition encompasses providing the right amounts of the proper specialized nutrients during the right developmental stages.
European sea bass have been raised in the favorable climate of the Middle East since 2000. For effective larval rearing of sea bass, the authors recommend the use of temperature-controlled water with about 35 ppt salinity and good aeration in tanks.
The REPROSEED project is taking a focused, cooperative approach to better understanding of optimized mollusc hatchery/nursery-rearing techniques.
Farm trials compare new products or methods with practices in current use. Due to aquaculture’s inherent variability, multiple replicate treatments in experimental units that are as similar as possible are required.
Most aquaculture farms rely on general strategies for biosecurity that implement protocols learned from others. Establishing effective biosecurity, however, can be complicated due to multiple interacting variables.
Authors evaluated how limiting dietary essential amino acids and long-chain polyunsaturated fatty acids would affect the growth performance of white shrimp raised in a zero-water-exchange biofloc system. The shrimp were fed diets with varied levels of fishmeal and fish oil and supplemented with soy products.
Bangladesh shrimp farmers are adopting measures to improve quality to comply with international standards. A survey found that most farmers visually evaluated shrimp by checking size, weight and signs of disease before harvesting.
In ongoing trials of greenhouse-enclosed intensive biofloc shrimp culture systems, the objectives of a 2012 study were to evaluate the performance of fast-growth shrimp fed a commercial diet formulated for high-density culture systems, and to further evaluate injector performance in the zero-exchange, super-intensive raceways.
The final article in a series about a project in Brunei to develop technology for production of black tiger shrimp focuses on the development of advanced grow-out ponds and practices with enhanced systems for biosecurity, sludge removal, water reuse, energy efficiency, automatic feeding and mechanical harvesting.