Several species of fresh water fish including common carp (Cyprinus carpio), rohu (Labeo rohita), mrigal (Cirrhinus mrigala) and rainbow trout (Oncorhynchus mykiss) are being farmed in India in order to meet the increasing demand for fresh fish. Among the fresh water fishes, rainbow trout is farmed in many parts of India. Worldwide, farmed trout production is increasing. The demand for trout in...

Myxobolus squamalis is a myxozoan skin parasite first reported from rainbow trout (Oncorhynchus mykiss). Identification of the parasite based on myxospore morphology is unreliable because M. squamalis is similar to several other myxobolids that share host species and geographic ranges. The only ssrRNA gene sequence available for M. squamalis is from Chinook salmon, Oncorhynchus tschawytscha, bu...

Seasonal samples of all fish species from Lake Moreno were taken in order to determine the presence of paratenia, to evaluate the status of the hosts and to characterise the transmission of Acanthocephalus tumescens (von Linstow, 1896) at the component population level. Prevalence, mean abundance, mean intensity, numbers of gravid females, relative abundance of the different fish species, relat...

18 Juvenile Oncorhynchus mykiss migrate extensively in freshwater during fall. We used 19 individual tagging to study the spatial origin, influences, and outcomes of fall migration on fish 20 that emigrated from summer rearing tributaries during fall (early-emigrants) and those that did 21 not (late-emigrants) in the South Fork John Day River, Oregon. Fall migration amplified body 22 size diffe...

The rainbow trout Oncorhynchus mykiss, was first introduced in Chile between 1905 and 1920 and is currently widely distributed in Chile from Antofagasta (23°S) to Patagonia (55oS). The broad range of the geographic and climatic distributions of this species in Chile offers a unique opportunity to study the effect of naturalization of an introduced species on its genetic variability. It is of pa...

2,4-D diklorofenoksi asetik asit (2,4-D) dünya genelinde yaygın olarak kullanılmakta olan bir herbisit olup, tarımsal mücadelede yabani otları elimine etmekte kullanılır. ve formlarının balıklar üzerinde yarattığı toksik etki diğer sucul canlılar oluşan etkiden hayli fazladır. Bu çalışmada Diklorofenoksi herbisitinin gökkuşağı alabalığının (Oncorhynchus mykiss) biyokimyasal hematolojik parametr...

Histopathological alterations in the heart are often reported in fish as a result of exposure to a variety of chemical compounds. However, researchers presently lack a standardized method for the evaluation of histopathological alterations in the cardiovascular system of fish and the calculation of an 'organ index'. Therefore, we designed a method for a standardized assessment and evaluation of...

Aquatic total phosphorus (Tot-P) is measured 30 m distant from rainbow trout (Oncorhynchus mykiss) cages, for regulatory compliance on the Canadian side of Lake Huron. The ability to predict changes in near-field Tot-P concentrations from changes in production, or to explain near-field concentrations in the event of compromised reference sites, would be very useful for managers and farmers. A l...