scholarly journals Microanatomy and ultrastructure of kidney interstitial cells and nephron in brown trout (Salmo trutta Linnaeus, 1758) at different stages of the life cycle

2022 ◽  
Author(s):  
Ekaterina Flerova ◽  
Victoria V. Yurchenko ◽  
Yulia P. Sapozhnikova ◽  
Dmitry S. Sendek ◽  
Sergey F. Titov ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Structural Features ◽  
Ultrastructural Changes ◽  
Migration Process ◽  
Renal Interstitium ◽  
Specific Granules ◽  
Brown Trout Salmo Trutta ◽  
The Baltic ◽  
First Time

The study focuses on the microanatomy and ultrastructural changes in the trunk kidney interstitium cells and nephrons in parr, smolt and spawning brown trout Salmo trutta Linnaeus, 1758 sampled in Luga River and Solka River, the tributaries of the Baltic Sea. Regardless of the type of cells or their structure, there were changes in their areas and the number and structure of organelles responsible for the transport, synthetic and energetic function of cells. Our data on the morphology of the nephron combined with data on its physiology suggest a fundamental change in kidney function during the parr-smolt transformation before migration; this could be a preadaptation for a successful life in saltwater where urine output is sharply reduced. Thus, detected structural features of the trunk kidney in brown trout S. trutta are cytological markers of the migration process. The numbers of lymphocytes, neutrophils and eosinophils with segmented nuclei increased from parr to smolts and then to spawners; only monotypic specific granules in neutrophils were found in smolts and spawners. Cells with radially arranged vesicles were described for the first time in brown trout S. trutta renal interstitium. Their origin has not yet been established. The shape of these cells changed from spherical to trihedral during fish maturation. All the above ultrastructural changes of renal interstitium cells could be considered cytological markers of cell maturity.

Energetics and survival of virgin and repeat spawning brown trout (Salmo trutta)

1998 ◽  
Vol 55 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Ole Kristian Berg ◽  
Eivind Thronæs ◽  
Gunnbjørn Bremset
Keyword(s):  
Brown Trout ◽  
Specific Energy ◽  
Salmo Trutta ◽  
Energy Content ◽  
Survival Rates ◽  
Total Protein Content ◽  
Energy Expenditures ◽  
Brown Trout Salmo Trutta ◽  
Investment In Reproduction ◽  
First Time

Smaller virgin spawners of a stunted population of brown trout (Salmo trutta) had higher specific energy content than repeat spawners, indicating that once maturation has started, the trout does not completely recover from its first spawning. Males had higher amounts of total and specific energy after spawning compared with females (adjusted for length differences). The greatest energy expenditures were recorded among spawning females (specific total energy losses of about 20%, which were twice the losses of male spawners). Repeat females lost 40% of their fat content. The gonads of the females accounted for 20% of the total protein content. The loss in carcass protein and fat for the spawners was greater than the corresponding loss in visceral fat and protein. Survival rates paralleled the amounts of energy expended in reproduction. Overall survival rate of first-time spawning males (females) was about 0.90 (1.00), while the corresponding value for repeat spawners was about 0.65 (0.50). It is predicted that brown trout from a stunted population should make a relatively small investment in reproduction and thus represent a case of low investment among iteroparous fish species.

Presence of rodlet cells in the intrahepatic biliary ducts of the brown trout, Salmo trutta fario Linnaeus, 1758 (Teleostei, Salmonidae)

1994 ◽  
Vol 72 (9) ◽  
pp. 1683-1687 ◽  
Author(s):  
Eduardo Rocha ◽  
Rogério A. F. Monteiro ◽  
Carlos A. Pereira
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Developmental Stages ◽  
Close Proximity ◽  
Brown Trout Salmo Trutta ◽  
Biliary Ducts ◽  
First Time ◽  
Pathological Reaction ◽  
Rodlet Cells ◽  
Salmo Trutta Fario

We report for the first time rodlet cells in the epithelium of intrahepatic biliary ducts of the brown trout (Salmo trutta fario Linnaeus 1758). Such cells have not been described in the liver of any salmonid. Several developmental stages of the rodlet cells were found, including mature, discharging elements. The number of rodlet cells decreased from June to April. Intra-epithelial macrophages were found in close proximity to rodlet cells, suggesting a mild pathological reaction.

scholarly journals Evidence for the linkage of survival of anadromous Arctic char and brown trout during winter to marine growth during the previous summer

2018 ◽  
Vol 75 (5) ◽  
pp. 663-672 ◽  
Author(s):  
Arne Johan Jensen ◽  
Bengt Finstad ◽  
Peder Fiske
Keyword(s):  
Brown Trout ◽  
Critical Period ◽  
Salmo Trutta ◽  
Critical Size ◽  
Salvelinus Alpinus ◽  
Salt Water ◽  
Arctic Char ◽  
Brown Trout Salmo Trutta ◽  
First Time ◽  
Previous Summer

Data from a 25-year study of anadromous Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in the River Halselva provided evidence that survival during winter was linked to marine growth during the previous summer. The study supported the “critical size and critical period” hypothesis, which postulates that regulation of the abundance of adult salmonids occurs in two major phases. The first phase is marine mortality that occurs shortly after smolts enter salt water, and the second is during the following winter, when individuals that have not attained a critical size are unable to meet minimum metabolic requirements and die. In the present study, growth during summer appeared to be more important to winter survival than body size. Size-selective mortality occurred both at sea during summer and in fresh water during winter and was more evident for first-time migrants than repeat migrants.

scholarly journals First record of Azygia robusta (Odhner, 1911) (Trematoda: Digenea: Azygiidae) in brown trout (Salmo trutta) in the VRBAS River

2018 ◽  
Vol 76 (2) ◽  
pp. 85-88
Author(s):  
Vera Nikolić ◽  
Branka Bilbija ◽  
Zlatko Nedić ◽  
Predrag Simonović ◽  
Vesna Djikanović
Keyword(s):  
Bosnia And Herzegovina ◽  
Brown Trout ◽  
Salmo Trutta ◽  
First Record ◽  
Fish Parasites ◽  
Image Analyzer ◽  
Trematode Parasite ◽  
Brown Trout Salmo Trutta ◽  
Banja Luka ◽  
First Time

Abstract The investigation of fish parasites in Bosnia and Herzegovina in recent years became significant, and therefore new records of parasitic trematodes and their hosts are important for better understanding of fish parasitology and pathology. In this study 41 parasitic specimens were collected and the basic taxonomical characters were measured (body length and width, diameter of oral and ventral sucker, length and width of pharynx, ovary length and width, testes length and width and eggs length and width). After the sampling of the parasites, they were collected and conserved in 70% ethanol. After that procedure the aforementioned characters were measured using Digimizer Image Analyzer Version 4.1. After all measurements, the trematode parasite Azygia robusta was confirmed for the first time on brown trout Salmo trutta. This first record was found in the Vrbas River near Banja Luka, Bosnia and Herzegovina (Sava River Basin). Former records of this parasite in Europe were observed on other salmonid fish species, as huchen Hucho hucho. This new record should be very important part of data of fish parasitology in Bosnia and Herzegovina.

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome

2011 ◽  
Vol 14 (3) ◽  
pp. 443-448 ◽  
Author(s):  
N. Kurhalyuk ◽  
H. Tkachenko ◽  
K. Pałczyńska
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Thiobarbituric Acid ◽  
Control Group ◽  
Thiobarbituric Acid Reactive Substance ◽  
Tbars Level ◽  
Reactive Substance ◽  
Brown Trout Salmo Trutta

Resistance of erythrocytes from Brown trout (Salmo trutta m. trutta L.) affected by ulcerative dermal necrosis syndrome In the present work we evaluated the effect of ulcerative dermal necrosis (UDN) syndrome on resistance of erythrocytes to haemolytic agents and lipid peroxidation level in the blood from brown trout (Salmo trutta m. trutta L.). Results showed that lipid peroxidation increased in erythrocytes, as evidenced by high thiobarbituric acid reactive substance (TBARS) levels. Compared to control group, the resistance of erythrocytes to haemolytic agents was significantly lower in UDN-positive fish. Besides, UDN increased the percent of hemolysated erythrocytes subjected to the hydrochloric acid, urea and hydrogen peroxide. Results showed that UDN led to an oxidative stress in erythrocytes able to induce enhanced lipid peroxidation level, as suggested by TBARS level and decrease of erythrocytes resistance to haemolytic agents.

Evaluation of brown trout (Salmo trutta fario) fillets’ shelf life: Fed with a humic supplemented diet

2021 ◽  
Vol 29 ◽  
pp. 100675
Author(s):  
Muhammed Atamanalp ◽  
Arzu Ucar ◽  
Esat Mahmut Kocaman ◽  
Gonca Alak
Keyword(s):  
Shelf Life ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta ◽  
Salmo Trutta Fario
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