scholarly journals Influence of farming technology on bioaccumulation of calcium, magnesium and sodium in muscle tissue of rainbow trout (Oncorhynchus mykiss Walbaum) / Wpływ technologii chowu na biokumulację wapnia, magnezu i sodu w tkance mięśniowej pstrąga tęczowego (Oncorhynchus mykiss Walbaum)

2014 ◽  
Vol 25 (3) ◽  
pp. 15-19
Author(s):  
Agnieszka A. Barszcz ◽  
Ewa Siemianowska ◽  
Marcin Sidoruk ◽  
Krystyna A. Skibniewska ◽  
Józef Szarek
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Muscle Tissue ◽  
Waste Waters ◽  
Fish Farms ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Influence Of Water ◽  
Water Recirculation ◽  
Calcium Magnesium ◽  
Flow Through

Abstract Poland is one of the countries with limited water resources where water saving is recommended e.g. by improving aquaculture methods to use less water. The aim of the study was to determine the influence of water quality and aquaculture technology on bioaccumulation of calcium, magnesium and sodium in muscle tissue of rainbow trout. The study was performed in spring and autumn 2011 in two trout fish farms using different farming technologies: one with flow-through system and the other with water recirculation system. The farming technology had significant influence on magnesium and sodium in waste waters but did not affect the content of the minerals in muscle tissue of rainbow trout

Impact of production technology on morphological lesions in the gills of commercial rainbow trout (Oncorhynchus mykiss, Walbaum 1792)

2017 ◽  
Vol 20 (2) ◽  
pp. 233-240
Author(s):  
E. Strzyżewska-Worotyńska ◽  
J. Szarek ◽  
I. Babińska ◽  
D. Gulda
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Production Technology ◽  
Environmental Changes ◽  
Fish Farms ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recirculating Aquaculture ◽  
Production Technologies ◽  
Flow Through ◽  
The Difference

Abstract The most popular rainbow trout (Oncorhynchus mykiss, Walbaum 1792) production technologies include both an extensive method with the flow through system (FTS) and an intensive method with the recirculating aquaculture system (RAS). Their impact on the fish was evaluated with a morphological assessment of the gills, as these are organs susceptible to environmental changes. Trout of 350 – 500 g body mass were caught for trial in spring and autumn, with 36 fish originating from 3 fish farms with the FTS system and an equal number from 3 RAS fish farms (n = 6). The fish were macroscopically examined and the gills were investigated microscopically (haematoxylin and eosin staining). Hypertrophy and hyperplasia were most commonly detected, amounting to 89% of all structural abnormalities. These lesions were slightly more common in the FTS, especially in autumn, whereas the changes to the blood vessels in the gills were observed more frequently in the rainbow trout from the RAS system than in the fish obtained from the FTS technology (the difference was statistically significant). The morphological lesions in the mucous cells of the gills were detected at a comparable severity regardless of the technology or production season. The predominantly low values of the histopathologic indices, which described the microscopic lesions in the gills of fish from the FTS and RAS systems, showed that the examined organ was most often free of lesions or demonstrated only minor morphological damage regardless of the production technology.

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