Piscirickettsia salmonis, or P. sal, is a persistent pathogen in the waters off Chile, causing millions of dollars of damage to the nation’s massive aquaculture industry. A university researcher 6,000 miles to the north hopes to provide insight that leads to the development of an effective vaccine.
In analyzing the plasmid sequence from the whole genome sequences of AHPND V. parahaemolyticus (V.p) isolates, researchers identified a clear geographical variation within the plasmid, and developed PCR methods to characterize AHPND V.p isolates as either Mexico-type or Southeast Asia-type.
This study investigated factors that predisposed catfish to motile Aeromonas septicemia (MAS) caused by virulent Aeromonas hydrophila (vAh). Results revealed that wounding on fish body surface was important for vAh infection and disease development.
Aquaculture ponds accumulate organic matter from organic fertilizer, remains of microorganisms produced within the pond, feces of the culture animals and uneaten feed. Claude E. Boyd, Ph.D., details the leading organic matter management practices, and says that the accumulation of organic matter is often not as great as believed.
An R&D trial was conducted with shrimp biofloc technology at a commercial facility in Saudi Arabia. Results indicated that biofloc technology can be effectively applied, with some protocol adjustments, in the KSA’s extreme desert environmental conditions.
Quantification of fish behavior is complex and depends on the experimental setup and biomarkers applied. A simple method was tested to quantify locomotor behavior to evaluate the effects of simulated water treatment scenarios using peracetic acid.
Epitheliocystis is an emerging infection among farmed gilthead seabream and is also lethal in mesocosm cultures of sharpsnout seabream larvae. Two studies of this disease at sites in Greece and Crete have characterized the gill and skin cysts in more detail.
Bubble size is a critical parameter in diffused bubble, aquaculture aeration systems. This study was conducted to determine the influence of water with different salinities on performance of nanobubble generating technology (NBT).
This study evaluated the susceptibility to IHHNV in three different shrimp batches by measuring infectivity titers. Each batch showed a different infectivity titer, therefore, each batch had a specific susceptibility to IHHNV.
Dietary phosphorus is essential for growth and healthy skeletal development of farmed fish. Fish health, limited availability and environmental concerns all urge modern aquaculture to handle phosphorous resources wisely and sustainably.
Silencing genes in white spot syndrome virus (WSSV) with critical roles in replication could provide a strong antiviral effect and thus reduce shrimp mortality. The authors therefore established a study to evaluate the antiviral efficacy of double-stranded (ds)RNA against non-structural WSSV genes.
Phytoplanktonic organisms, or microalgae, are very abundant in aquaculture ponds and have critical roles in these ecosystems, significantly influencing overall pond ecology and water quality. Proper management of phytoplankton populations is essential for successful aquaculture pond production.
Biological filters are essential parts of recirculating aquaculture systems that transform toxic fish compounds such as ammonium and nitrite into less-harmful nitrate. The authors tested the convenience and efficiency of three methods for the initial inoculation of aerobic biofilters.
Inbreeding commonly causes a decrease in the mean values of traits of productive interest in aquaculture. Results of a study, however, showed that inbreeding had no effect on grout survival of Pacific white shrimp from 65 to 130 days of age.
Much of the chemical breakdown of foodstuffs begins in the stomachs of animals through acidification. Effective use of digestive biology is a goal in aquaculture, so dietary acidifiers have been gaining interest in recent years.
Loop mediated isothermal amplification (LAMP) is a highly specific technique that can amplify DNA in isothermal conditions. The kit can amplify the target gene of the pathogen using a single temperature and give results in one hour.