scholarly journals Osmoregulation in Salmon and Sea Trout Alevins

1982 ◽  
Vol 101 (1) ◽  
pp. 61-70
Author(s):  
C. TALBOT ◽  
F. B. EDDY ◽  
J. JOHNSTON
Keyword(s):  
Osmotic Stress ◽  
Salmo Trutta ◽  
Developmental Stages ◽  
Electrolyte Concentration ◽  
Sea Water ◽  
Vitelline Membrane ◽  
Turnover Rates ◽  
Progressive Change ◽  
Sea Trout ◽  
Species Survival

Changes in survival, body-water content, body electrolyte concentration and Na+ turnover rates were studied in alevins of Atlantic salmon (Salmosalar L.) and sea trout (Salmo trutta L.) at different developmental stages following exposure to various dilutions of sea water. In 100% sea water, salmon alevins at 9 days post-hatch survived approximately 6 h, and seatrout alevins 13 days post-hatch survived approximately 4 h. In both species, survival in hyperosmotic media decreased and rates of dehydration and Na+ turnover increased with age and development. The progressive change inresistance to osmotic stress is associated with a decrease in body surface area occupied by the relatively impermeable vitelline membrane and to the development of functional gills, leading to an increase in permeability to water and salt.

Osmotic and Ionic Regulation in Scottish Brown Trout and Sea Trout (Salmo Trutta L.)

1959 ◽  
Vol 36 (2) ◽  
pp. 253-260
Author(s):  
MALCOLM S. GORDON
Keyword(s):  
Fresh Water ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Sea Water ◽  
Freezing Point ◽  
Water Levels ◽  
Acid Base Balance ◽  
Serum Samples ◽  
Water Stream ◽  
Sea Trout

1. Adult brown trout (Salmo trutta L.) of both sea-run (sea trout) and fresh-water stream (brown trout) forms were captured in the vicinity of Aberdeen and acclimatized to full-strength sea water for periods of up to 5 months. 2. Blood serum samples from these fish were analysed for freezing-point depression, chloride, sodium and potassium concentrations. 3. The patterns of regulation of these concentrations are very nearly the same in both forms. Brown trout and sea trout, at least in eastern Scotland, thus appear to be virtually identical in osmotic and ionic regulatory abilities. However, there is a possibility that there is a difference between the two forms with respect to mechanisms controlling blood acid-base balance. 4. The patterns of regulation shown by Scottish fish are the same as those shown by American hatchery fish treated similarly. The different populations of the species seem not to have diverged significantly from one another in this regard after many generations of more or less complete genetic isolation. 5. The species Salmo trutta is strongly homoiosmotic. Internal concentrations are either unchanged or increase by less than 10% above fresh-water levels with long-term acclimatizations to half and full sea water. The brown trout is the first salmonid species known to regulate so well.

Present Status of the Salmonids Atlantic Salmon and Sea-Trout in the Dutch Part of the River Rhine

1994 ◽  
Vol 29 (3) ◽  
pp. 37-41 ◽  
Author(s):  
W. G. Cazemier
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Natural Populations ◽  
River Rhine ◽  
Sea Trout ◽  
The Past ◽  
The North ◽  
Trout Population ◽  
The North Sea ◽  
Heavy Pollution

In the past, the anadromous salmonids, Atlantic salmon (Salmo salar) and sea-trout (Salmo trutta), have formed natural populations in the river Rhine. From the beginning of the nineteenth century onwards, the greater part of the drainage area of the river has been gradually altered from a more or less rural and agricultural area, into a highly industrialised one with subsequent industrialisation, river-engineering and heavy pollution. These developments are considered to be the major cause for the disappearance of the populations of anadromous salmonid fish in the 1950s. The water quality has recovered significantly during the past 25 years. From about 1975 onwards, this process gave rise to a recovery of the anadromous trout population. Results of recent studies of the sea-trout migration pattern are presented. They reveal that nowadays these salmonids can complete their up- and downstream migrations from the North Sea to places, situated at hundreds of kilometres upward the river and vica versa. The numbers of recorded Atlantic salmon and catch locations in inland waters are presented. They show a significant increase since 1989. These phenomena can be understood as promising signs of the recovery of the Rhine aquatic ecosystem.

Cytological status of the gonads and the level of thyroid and sex hormones in juvenile Black Sea trout, Salmo trutta labrax, of two phenotypic forms

2014 ◽  
Vol 54 (7) ◽  
pp. 476-484 ◽  
Author(s):  
D. S. Pavlov ◽  
E. D. Pavlov ◽  
E. V. Ganzha ◽  
V. V. Kostin ◽  
V. Yu. Ponomareva
Keyword(s):  
Sex Hormones ◽  
Black Sea ◽  
Salmo Trutta ◽  
Sea Trout ◽  
Phenotypic Forms

scholarly journals Environmentally sustainable feeding system for sea trout (Salmo trutta m. trutta): Live food and insect meal-based diets in larval rearing

2021 ◽  
Vol 21 ◽  
pp. 100795
Author(s):  
Lilianna Hoffmann ◽  
Mateusz Rawski ◽  
Ewa Pruszyńska-Oszmałek ◽  
Paweł Kołodziejski ◽  
Jan Mazurkiewicz
Keyword(s):  
Salmo Trutta ◽  
Live Food ◽  
Larval Rearing ◽  
Feeding System ◽  
Environmentally Sustainable ◽  
Sea Trout

The effects of lowered salinity upon Branchiostoma lanceolatum from the English Channel

1981 ◽  
Vol 61 (3) ◽  
pp. 685-689 ◽  
Author(s):  
J. Binyon
Keyword(s):  
Body Weight ◽  
Osmotic Stress ◽  
Sea Water ◽  
English Channel ◽  
Sharp Threshold ◽  
Branchiostoma Lanceolatum

Previous work has indicated that, although in possession of numerous supposedly osmoregulatory structures, Branchiostoma lanceolatum from the English Channel is unable to regulate its body weight in diluted sea water. In vitro measurements of the rate of flagella activity in those organs similarly indicates no increase under hypo-osmotic stress. There is however quite a sharp threshold around 18‰, below which flagella activity ceases quite abruptly. A similar situation obtains with the gill cilia although the animal can remain alive at these salinities for a period of several weeks.

scholarly journals The importance of being familiar: individual recognition and social behavior in sea trout (Salmo trutta)

1998 ◽  
Vol 9 (5) ◽  
pp. 445-451 ◽  
Author(s):  
Johan Höjesjö ◽  
Jörgen I. Johnsson ◽  
Erik Petersson ◽  
Torbjörn Järvi
Keyword(s):  
Social Behavior ◽  
Salmo Trutta ◽  
Individual Recognition ◽  
Sea Trout
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