DESCRIPTION OF A BACTERIUM ASSOCIATED WITH REDMOUTH DISEASE OF RAINBOW TROUT (SALMO GAIRDNERI)

1966 ◽  
Vol 12 (4) ◽  
pp. 763-770 ◽  
Author(s):  
A. J. Ross ◽  
R. R. Rucker ◽  
W. H. Ewing
Keyword(s):  
Rainbow Trout ◽  
Taxonomic Position ◽  
Salmo Gairdneri ◽  
Gram Negative ◽  
The Family ◽  
Normal Fish

A description was given of a gram-negative, peritrichously flagellated, fermentative bacterium that was isolated on numerous occasions from kidney tissues of rainbow trout (Salmo gairdneri) afflicted with redmouth disease. Although the bacteria apparently were members of the family Enterobacteriaceae, it was impossible to determine their taxonomic position within the family with certainty. Hence it was recommended that their taxonomic position remain sub judice for the present. As a temporary designation RM bacterium was used.Redmouth disease was transmitted from infected to normal fish through the medium of water.

Age and Vision as Factors in Bottom Colour Selection by Rainbow Trout, Salmo gairdneri

1969 ◽  
Vol 26 (3) ◽  
pp. 687-693 ◽  
Author(s):  
Wen-hwa Kwain ◽  
Hugh R. MacCrimmon
Keyword(s):  
Rainbow Trout ◽  
Light Intensity ◽  
Visible Light ◽  
Total Darkness ◽  
Salmo Gairdneri ◽  
Colour Discrimination ◽  
Significant Preference ◽  
Light Intensities ◽  
Behavioural Patterns ◽  
Normal Fish

Rainbow trout exposed in a circular tank to a choice of black or white bottom at a light intensity of 10−2 lux were randomly distributed until the age of 14 months at which time a significant preference for black began and became more pronounced with increasing age.Groups of fish (18–24 months of age) with normal eyes, without eye lenses, and lacking eyes, were held in total darkness and at 10−2, 10, and 200 lux. In total darkness all groups were randomly distributed and quiescent. Fish without eye lenses selected black at all visible light intensities and acted similarly to normal fish at 10−2 lux. Fish lacking eyes were randomly distributed and more-or-less inactive at all intensities.The eye is essential for bottom colour discrimination and behavioural patterns occurring in normal trout exposed to different light intensities.

scholarly journals GENE DUPLICATION WITHIN THE FAMILY SALMONIDAE: DISOMIC INHERITANCE OF TWO LOCI REPORTED TO BE TETRASOMIC IN RAINBOW TROUT

Genetics ◽  
1973 ◽  
Vol 74 (4) ◽  
pp. 647-654
Author(s):  
Frederick W Allendorf ◽  
Fred M Utter
Keyword(s):  
Rainbow Trout ◽  
Gene Duplication ◽  
Isocitrate Dehydrogenase ◽  
Allelic Variation ◽  
Salmo Gairdneri ◽  
Protein Subunits ◽  
Phenotypic Distribution ◽  
Electrophoretic Mobilities ◽  
Disomic Inheritance ◽  
The Family

ABSTRACT We describe our studies of the genetics of allelic variation for NADP-dependent isocitrate dehydrogenase (IDH) in rainbow trout (Salmo gairdneri). Five populations of rainbow trout were studied to determine the phenotypic distribution of IDH; 453 progeny from a number of controlled matings were examined to determine the nature of inheritance of these alleles. The variation was found to be the result of four alleles producing protein subunits of differing electrophoretic mobilities. Progeny from crosses clearly demonstrated the presence of two disomic loci controlling the variation, rather than one tetrasomic locus as had been previously reported. These findings support our contention that the hypothesis of a tetraploid event in salmonid evolution should not be uncritically accepted.

Electrical Responses of the Olfactory Bulb of Pacific Salmon Oncorhynchus nerka and Oncorhynchus kisutch

1972 ◽  
Vol 29 (9) ◽  
pp. 1351-1355 ◽  
Author(s):  
Toshiaki J. Hara
Keyword(s):  
Rainbow Trout ◽  
Pacific Salmon ◽  
Oncorhynchus Nerka ◽  
Threshold Concentration ◽  
Salmo Gairdneri ◽  
Olfactory Responses ◽  
Amino Acid Solutions ◽  
Normal Fish ◽  
Different Sources ◽  
Electrical Responses

Olfactory bulbar electrical responses elicited by nasal infusion of food extracts, hand rinse, and several amino acid solutions were studied in sockeye (Oncorhynchus nerka) and coho (O. kisutch) salmon from several different sources. Comparison was also made in rainbow trout (Salmo gairdneri). Significant variations in the olfactory bulbar responses were observed among different species and even among the same species from different sources. The estimated lowest threshold concentration for L-serine was between 10−6 and 10−7 M in salmon. Olfactory responses of rainbow trout were always several times larger than those of salmon.Pretreatment of nasal cavity with 10−4 M solutions of HgCl2 or CuSO4 (27 or 16 mg/liter, respectively) for 10 sec completely blocked the olfactory responses in all fish species studied. The effect was reversible; the responses returned to their original level by rinsing. Exposure of fish to 0.1 mg/liter HgCl2 for up to 3 days reduced the olfactory responses to 40–10% of those of normal fish. CuSO4 was the more toxic.

scholarly journals ADULT TRIPLOIDS IN A RAINBOW TROUT FAMILY

Genetics ◽  
1979 ◽  
Vol 93 (4) ◽  
pp. 961-973 ◽  
Author(s):  
Gary H Thorgaard ◽  
Graham A E Gall
Keyword(s):  
Rainbow Trout ◽  
Y Chromosome ◽  
Sexual Maturation ◽  
Fish Culture ◽  
Salmo Gairdneri ◽  
External Appearance ◽  
Hatchery Stock ◽  
Normal Fish ◽  
Production Losses

ABSTRACT Six triploid individuals were found in a full-sib family of 11 adult rainbow trout (Salmo gairdneri) from a domesticated hatchery stock. The triploid individuals were normal in size and external appearance, had underdeveloped gonads, and showed no evidence of 3n/2n chimerism or mosaicism. XXY triploids were males, suggesting that the Y chromosome is male determining in trout. Because they may avoid production losses associated with sexual maturation in normal fish, triploid trout and salmon could potentially be useful in fish culture.

scholarly journals An Aerogenic Pasteurella-Like Organism Isolated from Horses

1989 ◽  
Vol 1 (1) ◽  
pp. 3-5 ◽  
Author(s):  
Linda R. K. Schlater
Keyword(s):  
Taxonomic Position ◽  
Respiratory Pathogen ◽  
New Taxon ◽  
Case Histories ◽  
Genetic Studies ◽  
Gram Negative ◽  
Biochemical Characteristics ◽  
Secondary Role ◽  
The Family ◽  
Clinical Conditions

Thirteen strains of a gram-negative, fermentative bacterium that produced gas from glucose were isolated from horses with a variety of clinical conditions. The morphological and biochemical characteristics of this bacterium are similar to those described for the family Pasteurellaceae. These strains appear to constitute a new taxon within the genus Pasteurella; however, the final taxonomic position of this group depends upon more detailed genetic studies. Case histories indicate that this bacterium may be a primary respiratory pathogen and may play a secondary role in various other disease conditions.

scholarly journals Draft Genome Sequences of Three Flavobacterium psychrophilum Strains Isolated from Diseased Ayu (Plecoglossus altivelis altivelis) Caught at Three Sites in the Kagami River in Kochi, Japan

2019 ◽  
Vol 8 (34) ◽  
Author(s):  
Hazuki Yamashita ◽  
Takayuki Wada ◽  
Yusuke Kato ◽  
Takuji Ikeda ◽  
Masayuki Imajoh
Keyword(s):  
Draft Genome ◽  
Psychrophilic Bacterium ◽  
Genome Sequences ◽  
Plecoglossus Altivelis ◽  
Gram Negative ◽  
Content Type ◽  
Flavobacterium Psychrophilum ◽  
Skin Ulcers ◽  
The Family

Flavobacterium psychrophilum is a Gram-negative, psychrophilic bacterium within the family Flavobacteriaceae. Here, we report the draft genome sequences of three F. psychrophilum strains isolated from skin ulcers of diseased ayu caught by tomozuri angling at three sites in the Kagami River in Japan.

Temperature Selection of Rainbow Trout (Salmo gairdneri) Fingerlings in Vertical and Horizontal Gradients

1971 ◽  
Vol 28 (11) ◽  
pp. 1801-1804 ◽  
Author(s):  
R. W. McCauley ◽  
W. L. Pond
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Temperature Preference ◽  
Temperature Selection ◽  
Horizontal Gradients ◽  
Significant Difference ◽  
Preferred Temperatures ◽  
Laboratory Investigations ◽  
Horizontal Temperature Gradients ◽  
Selection Of

Preferred temperatures of underyearling rainbow trout (Salmo gairdneri) were determined in both vertical and horizontal temperature gradients. No statistically significant difference was found between the preferred temperatures by the two different methods. This suggests that the nature of the gradient plays a lesser role than generally believed in laboratory investigations of temperature preference.

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