Flavobacterium bernardetii sp. nov., a possible emerging pathogen of farmed rainbow trout (Oncorhynchus mykiss) in cold water

Aquaculture ◽  
2021 ◽  
Vol 540 ◽  
pp. 736717
Author(s):  
Izzet Burcin Saticioglu ◽  
Hilal Ay ◽  
Soner Altun ◽  
Nevzat Sahin ◽  
Muhammed Duman
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Cold Water ◽  
Emerging Pathogen ◽  
Rainbow Trout Oncorhynchus Mykiss

Cold tolerance performance of westslope cutthroat trout (Oncorhynchus clarkii lewisi) and rainbow trout (Oncorhynchus mykiss) and its potential role in influencing interspecific hybridization

2014 ◽  
Vol 92 (9) ◽  
pp. 777-784 ◽  
Author(s):  
M.M. Yau ◽  
E.B. Taylor
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Water Temperature ◽  
Cold Water ◽  
Cutthroat Trout ◽  
Acclimation Temperature ◽  
Westslope Cutthroat Trout ◽  
Oncorhynchus Clarkii ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Differential Adaptation

Hybridization between rainbow trout (Oncorhynchus mykiss (Walbaum, 1792)) and westslope cutthroat trout (Oncorhynchus clarkii lewisi (Girard, 1856)) occurs commonly when rainbow trout are introduced into the range of westslope cutthroat trout. Typically, hybridization is most common in warmer, lower elevation habitats, but much less common in colder, higher elevation habitats. We assessed the tolerance to cold water temperature (i.e., critical thermal minimum, CTMin) in juvenile rainbow trout and westslope cutthroat trout to test the hypothesis that westslope cutthroat trout better tolerate low water temperature, which may explain the lower prevalence of rainbow trout and interspecific hybrids in higher elevation, cold-water habitats (i.e., the “elevation refuge hypothesis”). All fish had significantly lower CTMin values (i.e., were better able to tolerate low temperatures) when they were acclimated to 15 °C (mean CTMin = 1.37 °C) versus 18 °C (mean CTMin = 1.91 °C; p < 0.001). Westslope cutthroat trout tended to have lower CTMin than rainbow trout from two populations, second–generation (F2) hybrids between two rainbow trout populations, and backcrossed rainbow trout at 15 °C (cross type × acclimation temperature interaction; p = 0.018). Differential adaptation to cold water temperatures may play a role in influencing the spatial distribution of hybridization between sympatric species of trout.

scholarly journals Emerging trends of rainbow trout (Oncorhynchus mykiss) aquaculture in Nepal Himalaya

2014 ◽  
Vol 4 (1) ◽  
pp. 7-15
Author(s):  
Tek Bahadur Gurung ◽  
Suresh Kumar Wagle ◽  
Agni Prasad Nepal ◽  
Gopal Prasad Lamsal
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Urban Areas ◽  
Cold Water ◽  
Nepal Himalaya ◽  
Nutritional Security ◽  
Mountainous Regions ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Emerging Trends ◽  
Food And Nutritional Security

Recently, aquaculture technology of cold water Rainbow trout (Oncorhynchus mykiss) has been popular among farmers in hills and mountains of Nepal Himalaya.  Production of rainbow trout started in government and private farms in 1995 and 1998, respectively. At present the rainbow trout farming has expanded in several mountain districts with rapidly growing demand in others adjacent areas.  The total farmers have increased from none to 85 producing more than 180 metric ton from 16 districts by employing about 550 people in year 2012. The trout aquaculture technology could be expanded in areas having pristine, cold and clean water resources having road access for market destinations close to urban areas of all Trans Himalayan countries as a means to food and nutritional security, and employment opportunities in mountainous regions.

scholarly journals Current Status of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792), Fisheries in Munnar Hills of South India

2021 ◽  
Vol 34 (4) ◽  
Author(s):  
J.C. WALTER DEVAA ◽  
◽  
AISHWARYA SHARMA ◽  
RAMESH UTHANDAKALAIPANDIAN
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Brown Trout ◽  
Salmo Trutta ◽  
South India ◽  
Cold Water ◽  
Current Status ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Brown Trout Salmo Trutta ◽  
Current Scenario

Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), is a popular cold-water fish species widely distributed and farmed across the globe. In India, rainbow trout fisheries are common in the Himalayan states and the Western Ghats of South India. The introduction of brown trout, Salmo trutta fario (Linnaeus, 1758), in Munnar, Kerala, India, dates back to 1909. As the farming of brown trout was not successful, rainbow trout were introduced in 1932. However, no data regarding trout fisheries post-1970 are available. Hence, this study aimed to assess the current scenario of O. mykiss fisheries by analysing the existing angling and production records and interviewing the officials in charge. The results showed that O. mykiss fisheries in Munnar are currently endangered, and only a few numbers of O. mykiss stock are found in Rajamallay Stream, which is the present stocking site. Studies have shown that destructive fishing, pollution, siltation, and animal intrusion contributed to the decline of trout stocks in this region. Proper conservative measures, good hatchery conditions, adequate broodstock management, feed improvement, and regular seed stocking can improve the production of O. mykiss in Munnar.

Effects of heat stress on biochemical parameters and heat shock protein family A (Hsp70) member 5 (HSPA5) mRNA expression in rainbow trout (Oncorhynchus mykiss)

2018 ◽  
Vol 69 (11) ◽  
pp. 1674 ◽  
Author(s):  
Binpeng Xia ◽  
Zhe Liu ◽  
Yanjing Zhou ◽  
Yongjie Wang ◽  
Jinqiang Huang ◽  
...  
Keyword(s):  
Heat Stress ◽  
Rainbow Trout ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
Oncorhynchus Mykiss ◽  
Mrna Expression ◽  
Biochemical Parameters ◽  
Cold Water ◽  
Protein Family ◽  
Rainbow Trout Oncorhynchus Mykiss

Rainbow trout (Oncorhynchus mykiss) is a cold-water species of salmonid, and high temperatures are a significant threat to its aquaculture. In order to understand the degree of the heat stress response and the mechanisms involved, full-sibling inbred O. mykiss individuals were sampled at 18, 21, 23, 24, 25 and 26°C to investigate changes in some serum biochemical parameters, as well as in the mRNA expression of heat shock protein family A (Hsp70) member 5 (HSPA5; also known as glucose regulated protein 78 (GRP78)) in different tissues (liver, mid-kidney, heart, spleen and brain). At 21°C, there was a significant increase in the spleen macrophage respiratory burst and a significant decrease in superoxide dismutase activity compared with 18°C (P<0.05). Malondialdehyde peaked at 23°C, whereas alanine transaminase and aspartate aminotransferase activity were both twofold higher at 25 and 26°C compared with that at 18°C. The Ca2+, Mg2+, PO43– and glucose (Glu) content of serum declined significantly at 21°C relative to 18°C (P<0.05). The expression of HSPA5 mRNA responded in a temperature- and tissue-specific manner to heat stress. Except for in the spleen, HSPA5 mRNA expression was significantly higher in all tissues at 25 and 26°C than that at 18°C (P<0.05). These results indicate that heat stress causes oxidative damage, decreases the Ca2+, Mg2+, PO43– and Glu content of serum and induces HSPA5 mRNA expression.

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