Genetic markers help track soy protein utilization in shrimp
Recent research by the authors discovered genetic markers for the identification of Pacific white shrimp with enhanced capability to convert soy protein in feed.
Multi-phase shrimp production in sun-driven Honduran ponds
Honduras-based Grupo Granjas Marinas believes that large-scale production of rotifers and copepods and sequential pond inoculations, in combination with short shrimp growth cycles can significantly increase shrimp production while reducing dependency on other sources of protein in feeds.
Seaweeds: Top mariculture crop, ecosystem service provider
Seaweed aquaculture represents approximately half of the world mariculture production, but since seaweed farming is mostly concentrated in Asian countries, there is a lack of appreciation for this resource in the Western world.
Bacillus probiotics improve hatchery, nursery production in EMS-hit Mexico
In early 2014, a trial to evaluate the effects of a mixture of Bacillus strains on early mortality syndrome bacteria during the larviculture and nursery phases for shrimp was carried out at a commercial hatchery in Mexico.
Sea bream price integration along value chain in Spain
Work by the authors analyzed price competition for farmed sea bream from Greece, Turkey and Spain across the value chain.
‘Big picture’ connects shrimp disease, inbreeding
Disease problems on shrimp farms may be partly driven by an interaction between management practices that cause inbreeding in small hatcheries and the amplification by inbreeding of susceptibility to disease and environmental stresses.
Genetic improvement programs for shrimp vary between Asia, Americas
There is a clear difference between the shrimp postlarvae traits that are economically important in Central and South America versus those of Asia, creating a challenge for breeders to satisfy the somewhat opposing breeding goals the regions demand.
What size are your postlarvae?
Although the characteristics of shrimp postlarvae have changed over time, the standard method used to identify their size has not. Usually, the “size” of postlarvae is considered their chronological age after completing metamorphosis.
Ammonia addition enhances microbial flocs in nursery phase for Pacific white shrimp
In a study, “pre-fertilization” in the nursery phase of a biofloc system for shrimp was tested. The objective was to accelerate the biofloc formation to minimize ammonia concentrations, avoiding high peaks during culture.
Chemical treatment costs reduced with in-pond raceway systems
By dividing ponds into smaller, more controllable areas, IPRS can substantially reduce chemical treatment costs, improve treatment delivery and allow new treatments that are cost-prohibitive in traditional pond settings.
Cathepsin enzymes, part 2
Cathepsin D alone and in combination with other cathepsins presents the greatest proteolytic activity on some fish muscles.
Cathepsin enzymes, part 1
Cathepsins B, D and L are considered critical in fish muscle post-mortem modifications or gel softening during the setting of surimi.
Algae shows promise as alternative DHA source in rainbow trout diets
A growth trial in Canada evaluated the use of algae biomass to increase the concentration of long-chain polyunsaturated fatty acids in the tissues of rainbow trout.
Dietary sodium butyrate improves performance of Pacific white shrimp
Sodium butyrate has potential as an additive for marine shrimp diets, improving both the balance of intestinal bacterial flora and performance of the shrimp.
Do current shrimp practices favor EMS?
After refilling ponds, surviving microorganisms – including Vibrio parahaemolyticus, which causes EMS in shrimp – may benefit from the availability of nutrients in sediment and water and lack of competing microorganisms.
Market test: Farm-grown freshwater prawns
A small test market at a high-end grocery store near Washington, D.C., USA, showed that farm-grown freshwater prawns would sell to high-income consumers who had not previously tried the product.