Tag rainbow trout

Aquafeed manufacturers and alternative feed ingredient suppliers from all over the world gathered in Silicon Valley for F3, the Fish Free Feed contest. In the hub of innovation, solutions to a global problem were on full display. 

India has a small trout farming industry in the Himalayan and Southern Peninsula areas. Even though current annual production is only a few hundred tons, the country has many areas that, although geographically difficult to work in, also offer excellent, very large habitats and conditions for trout culture. 

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. 

Various additives, many of plant origin, have been explored to replace the use of antibiotics in aquafeed. The authors compared the performance of rainbow trout fed diets containing oxytetracycline or mineral additives yellow loess and Song-Gang stone powder. 

The use of larger and deeper tanks can reduce building, labor and other aquaculture production costs. However, the ability to grade and transfer large numbers of fish is more challenging when using large tanks. In a comparison of the effectiveness of a purse seine and a hinged clamshell to crowd fish in large tanks, the latter was easier to control and less stressful to salmonids. With a slotted bar rack in a side panel of the clamshell crowder, fish were simultaneously graded in size. 

Reduced performance in fish fed high-soy feeds has been blamed on antinutrients, low methionine content and palatability issues. Pretreatment to inactivate anti-nutritional compounds and supplementation with amino acids improves soy-based feed performance, but not to control levels. 

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. 

Circular tank-based recirculating aquaculture systems can be used to effectively culture rainbow trout and other salmonids in a bio-secure and environmentally friendly manner that imposes a much lower water and wastewater footprint than traditional flow-through culture technologies. 

Working on a system for oral delivery of IHNV vaccine via fish feed, researchers' goal is to adapt a proven oral DNA-based vaccine given to salmon in Canada to rainbow trout through encapsulation with a polymer or liposome. 

To alleviate problems associated with conducting research on fish of unknown and likely diverse genetic backgrounds, a collaborative project has been established to produce a stock of rainbow trout with a defined genetic background for use in fish nutrition research. 

In a study, ground barley containing different levels of beta-glucan was substituted for wheat in experimental diets fed to rainbow trout. 

The culture of sterile triploid rainbow trout, which carry three sets of chromosomes, can limit losses to sexual maturation and reduce potential problems regarding interactions of escaped fish with natural stocks. The authors’ research holds promise for creating tetraploid rainbow trout strains that can be crossed with diploid trout to yield triploids for aquaculture production. 

Research at the Conservation Fund’s Fresh­water Institute is evaluating a prototype percussive stunning system for slaughtering food-size rainbow trout. 

Proposed best management practices for rainbow trout production address eight areas of production covering the entire culture cycle. 

Methionine hydroxy analog (MHA) supplementation and the addition of other amino acids in soybean-based trout diets can improve their nutritional values.