A minichromosome carrying a pigmentation gene and brook trout DNA sequences in transgenic rainbow trout

Genome ◽  
1997 ◽  
Vol 40 (5) ◽  
pp. 594-599 ◽  
Author(s):  
Andrew S. Peek ◽  
Paul A. Wheeler ◽  
Carl O. Ostberg ◽  
Gary H. Thorgaard
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Dna Sequences ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Third Generation ◽  
Pigmentation Gene ◽  
The Third ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Repeat Dna

We describe the transmission of an introduced minichromosome of brook trout (Salvelinus fontinalis) origin, carrying a pigmentation gene, through three generations in rainbow trout (Oncorhynchus mykiss). The minichromosome was originally introduced into gynogenetic albino rainbow trout using γ-irradiated brook trout sperm. In the third generation, the presence of the minichromosome was correlated with pigmentation. A brook trout specific interspersed repeat DNA sequence, Fok I, was also correlated with pigmentation in these individuals. This system, the first clearly documented example of induced chromosome mediated gene transfer at the organismal level, could have applications in studies of gene mapping, development, gene regulation, and chromosome function.Key words: gynogenesis, transgenic, trout, minichromosome, Oncorhynchus mykiss.

Rainbow trout (Oncorhynchus mykiss) habitat overlap with wild Atlantic salmon (Salmo salar) and brook trout (Salvelinus fontinalis) in natural streams: do habitat and landscape factors override competitive interactions?

2018 ◽  
Vol 75 (11) ◽  
pp. 1949-1959
Author(s):  
Scott D. Roloson ◽  
Kyle M. Knysh ◽  
Michael R.S. Coffin ◽  
Karen L. Gormley ◽  
Christina C. Pater ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Atlantic Salmon ◽  
Oncorhynchus Mykiss ◽  
Salmo Salar ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Habitat Overlap ◽  
Atlantic Salmon Salmo Salar ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Natural Streams

The purpose of this study was to update rainbow trout (Oncorhynchus mykiss) invasion status, delineate factors that increase the invasion probability, and quantify habitat overlap between invasive rainbow trout and native Atlantic salmon (Salmo salar) and brook trout (Salvelinus fontinalis) on Prince Edward Island, Canada. Analysis of landscape-level variables in 26 watersheds (14 with and 12 without rainbow trout) demonstrated that watershed slope, percent agricultural land use, and distance to the nearest rainbow trout population significantly increased the probability of rainbow trout establishment. Two independent reach-level fish community surveys were conducted by electrofishing in combination with habitat surveys. Reaches with rainbow trout had higher stream slope, Atlantic salmon were found in wider reaches with larger substrate, and brook trout were typically dominant in headwater reaches with finer substrate. Findings at multiple ecological scales illustrated that rainbow trout invasion success is positively influenced by the presence of high-slope habitat. Habitat separation of the three salmonid species indicates that competition with introduced rainbow trout may not be the most significant threat to native salmonid populations.

scholarly journals A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis)

Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1043
Author(s):  
Paolo Pastorino ◽  
Ana Isabel Vela Alonso ◽  
Silvia Colussi ◽  
Giulia Cavazza ◽  
Vasco Menconi ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Physiological Stress ◽  
Clinical Signs ◽  
Lactococcus Garvieae ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Mediterranean Countries ◽  
Summer Mortality

Lactococcosis is a fish disease of major concern in Mediterranean countries caused by Lactococcus garvieae. The most susceptible species is the rainbow trout (Oncorhynchus mykiss), suffering acute disease associated with elevated mortalities compared to other fish species. References reported that other salmonids are also susceptible to the disease, but no mortality outbreak has been described to date. The aim of this study was to present a mortality outbreak that occurred in brook trout (Salvelinus fontinalis) farmed in northwestern Italy during the summer of 2018. Fish exhibited clinical signs, such as exophthalmos, diffused hemorrhages localized in the ocular zone, hemorrhagic enteritis, and enlarged spleen. L. garvieae was isolated in all fish. Molecular and epidemiological characterization of the isolates, through Pulsed Field Gel Electrophoresis (PFGE), confirmed the initial hypothesis of water as vehicle of infection favoring transmission between rainbow trout farmed in upstream compartments and brook trout located in downstream tanks. Moreover, several environmental conditions affected and promoted the outbreak, among them the high-water temperature, which probably induced a physiological stress in brook trout, being way above the optimal temperature for this species, increasing the susceptibility to infection.

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