Tumor necrosis factor-alpha (TNF alpha) is a cytokine with multiple biological functions which, in mammals, has been shown to modulate muscle and adipose tissue metabolism. In fish, TNF alpha has been identified in several species. However, few studies have examined the role of TNF alpha in fish outside the immune system. In this study, we assessed the effects of human recombinant TNF alpha and...

—Taurine has been demonstrated to be conditionally indispensable for several carnivorous fish species. Current trends in trout production include decreasing levels of fish-meal content in feeds, along with faster growing strains of fish. Taurine may be a limiting nutrient in support of elevated planes of growth for rainbow trout. A 9-wk feeding trial was conducted using a factorial treatment de...

We evaluated methylmercury (MeHg) concentrations in native apex predators, lake trout Salvelinus namaycush before and after the large-scale removal of introduced predators, smallmouth bass Micropterus dolomieu in a 270 ha Adirondack lake. Previous studies show that removing competitors can result in increased growth and decreased mercury concentrations in remaining fish. Instead, we observed a ...

Serbian aquaculture is practiced in warmwater (carp) farms, coldwater (trout) cage systems, recirculating systems (RAS) and fish tanks. The total area under carp farms (ponds) registered by the Statistical Office of Republic Serbia (SORS) last fourteen years has varied between 6,192 8,940 ha, while trout was 33,255 m2 81,411 m2. Total production over 5,070 tons, recorded 2017 8,195 tons market ...

The most common commercial slaughter method for portion-sized rainbow trout is asphyxiation in ice slurry. This method is however widely believed to expose the fish to unnecessary pain and suffering. The industry is consequently seeking an alternative method, which offers improved welfare of the fish at slaughter. Electric stunning of fish in water is identified as a suitable method. Parameters...

1 The introduction of farmed trout (stocking) to support anglers’ catches is a well-established and widespread practice. Many fisheries rely upon it to remain viable for example reservoir trout fisheries that lack natural trout production. However, in waters with a natural population of trout, stocking of farmed fish can present risks to the wild population through inter-breeding and competition.

We evaluated the movement of adult brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss in relation to a catch-andrelease area in the White River downstream from Beaver Dam, Arkansas. Nine fish of each species were implanted with radio transmitters and monitored from July 1996 to July 1997. The 1.5km river length of a catch-and-release area (closed to angler harvest) was greater than ...

BACKGROUND Diets used in commercial fish farming use significant proportions of crop-derived commodities, and it is important to understand the potential for transfer of any pesticide residues on the crop into edible tissues in fish. It is a current requirement in the EU that fish metabolism studies must be performed when a pesticide is used in crops where commodities or processed fractions are...

this study evaluated the effects of probiotic, lactobacillus plantarum on serum biochemical and some immune parameters of immunized rainbow trout weighting 29.6±1.84 g, with streptococcosis/lactococosis vaccine at 16±1.5°c, for 60 days. a commercial diet was used as the control. fish in the first treatment were immunized with streptococcosis/lactococosis vaccine in bathing route for 1 min. in t...

In the Logan River, UT, USA, exotic brown trout demonstrate a strong allopatric distribution and occur at high densities at low-elevation sites and in tributaries, and in low densities at native trout dominated, high-elevation sites. Summer temperatures and discharge do not appear limiting for growth; adult growth rates were high overall and were greatest when fish were held experimentally at h...