Site specificity of Gyrodactylus salaris Malmberg, 1957 (Monogenea) on Atlantic salmon (Salmo salar L.) in the River Lakselva, northern Norway

1992 ◽  
Vol 70 (2) ◽  
pp. 264-267 ◽  
Author(s):  
Arne Johan Jensen ◽  
Bjørn Ove Johnsen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Infection Intensity ◽  
The Body ◽  
Site Specificity ◽  
Caudal Fin ◽  
Northern Norway ◽  
Dorsal Fin ◽  
Atlantic Salmon Salmo Salar

Site specificity of Gyrodactylus salaris on 853 Atlantic salmon (Salmo salar) parr infected with 1 – 10 625 parasites was studied in the River Lakselva in northern Norway. At low intensities (< 100), the dorsal fin was the principal site of attachment, followed by the pectoral and anal fins. However, the distribution of parasites on the fish, and their crowding, varied with infection intensity. When the intensity increased to more than 100, more parasites were located on the caudal fin, and when it exceeded 1000, the body of the fish was also heavily infected.

The pathology of "saddleback" disease of underyearling Atlantic salmon (Salmo salar)

1980 ◽  
Vol 58 (7) ◽  
pp. 1283-1287 ◽  
Author(s):  
D. K. Cone ◽  
J. D. Miller ◽  
W. K. Austin
Keyword(s):  
Connective Tissue ◽  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
The Body ◽  
Fish Hatchery ◽  
Gram Negative ◽  
Dorsal Fin ◽  
Atlantic Salmon Salmo Salar ◽  
Epaxial Muscles

This study describes the pathology of "saddleback" disease of underyearling Atlantic salmon (Salmo salar) cultured at the Mactaquac Fish Hatchery near Fredericton, New Brunswick. A gram-negative, flexible, bacterium had a constant association with the characteristic lesion. It is thought that the bacteria enter the dorsal fin and then spread into the surrounding dermis by moving through the connective tissue and collagen layers. This causes sloughing of the overlying epidermis and some scales, and results in a symmetrical band of discoloration on the flanks of the body on either side of the dorsal fin. Invasion of the underlying epimysium and perimysium leads the bacteria deep into the dorsal fin levators and the epaxial muscles on either side of the dorsal fin. Evidence suggests the bacteria can enter muscle cells and destroy the cell from within. The bacterium was not found in any other tissue.

scholarly journals Heads and tails: The notochord develops differently in the cranium and caudal fin of Atlantic Salmon ( Salmo salar , L.)

2020 ◽  
Author(s):  
Harald Kryvi ◽  
Kari Nordvik ◽  
Per Gunnar Fjelldal ◽  
Mariann Eilertsen ◽  
Jon Vidar Helvik ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Caudal Fin ◽  
Atlantic Salmon Salmo Salar

scholarly journals Prevalence of piscine orthoreovirus and salmonid alphavirus in sea-caught returning adult Atlantic salmon (Salmo salar L.) in northern Norway

2018 ◽  
Vol 41 (5) ◽  
pp. 797-803 ◽  
Author(s):  
A S Madhun ◽  
C H Isachsen ◽  
L M Omdal ◽  
A C B Einen ◽  
S Maehle ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Northern Norway ◽  
Atlantic Salmon Salmo Salar

Selection of Microhabitat in Summer by Juvenile Atlantic Salmon (Salmo salar)

1987 ◽  
Vol 44 (1) ◽  
pp. 120-129 ◽  
Author(s):  
D. L. Morantz ◽  
R. K. Sweeney ◽  
C. S. Shirvell ◽  
D. A. Longard
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
The Body ◽  
Flow Conditions ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Salmon Fry ◽  
Study Sites ◽  
Selection Of ◽  
Atlantic Salmon Parr

This study was designed to define the microhabitats selected in summer by juvenile Atlantic salmon (Salmo salar). Curves were developed describing the preference of 880 young salmon for water velocity at the fish's position (nose velocity), mean water column velocity, total water depth, and stream substrate size. Study sites were chosen in six morphologically diverse streams in Nova Scotia and New Brunswick during 1982–84. Of the four variables measured, only nose velocity chosen by both fry and parr was not significantly different among years or rivers. Atlantic salmon fry (< 65 mm) most frequently selected nose velocities between 5 and 15 cm∙s−1, small parr (65–100 mm) between 5 and 25 cm∙s−1 and large parr (> 100 mm) between 5 and 35 cm∙s−1. Apparently, juvenile salmon utilized water depths and stream substrates which varied within tolerable limits according to their availability in conjunction with preferred water velocities. Significant differences in the body shape and size of the pectoral fin of Atlantic salmon parr in different rivers did not influence the selection of nose velocities within the range of flow conditions sampled.

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