Promoting water circulation during the day time is an effective strategy to enrich pond water with oxygen produced by photosynthesis, and can significantly reduce the costs of night time supplemental aeration.
Authors examined the histological features from shrimp infected with the emerging microsporidian parasite Enterocytozoon hepatopenaei (EHP). A PCR assay method was used to detected in hepatopancreatic tissue, feces and water sampled from infected shrimp tanks, and in some samples of Artemia biomass.
Early Mortality Syndrome has devastated farmed shrimp in Asia and Latin America. With better understanding of the pathogen and the development and improvement of novel strategies, shrimp farmers are now able to better manage the disease.
Increased attention to nutrient digestibility and gut health are two important focus areas for technological development of manufactured feeds in the aquaculture industry. Both laboratory and field studies have demonstrated the potential benefits for aquaculture productivity and the economics of specific feed additives developed to stimulate the establishment of a healthy gut microflora.
Salmon farmers, using emerging technologies, are exploring new methods of sea lice mitigation in an effort to overcome one of the industry’s most persistent problems. New chemical-free innovations show an industry eager to adapt and adopt environmentally safe practices.
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.