Influence of Body Size on Silvering of Atlantic Salmon (Salmo salar) at Parr–Smolt Transformation

1970 ◽  
Vol 27 (5) ◽  
pp. 983-987 ◽  
Author(s):  
C. E. Johnston ◽  
J. G. Eales
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
Water Temperature ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Salmon Parr ◽  
Negligible Influence ◽  
Atlantic Salmon Parr

Large yearling Atlantic salmon parr turn silvery more quickly than small parr when held under a series of controlled temperature and photoperiod regimes. Photoperiod appeared to exert a negligible influence on silvering, and water temperature was the main controlling variable.

Degradation of DDT in Atlantic Salmon (Salmo salar)

1968 ◽  
Vol 25 (11) ◽  
pp. 2321-2326 ◽  
Author(s):  
G. L. Greer ◽  
U. Paim
Keyword(s):  
Atlantic Salmon ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Salmo Salar ◽  
Aqueous Suspensions ◽  
Atlantic Salmon Salmo Salar ◽  
Salmon Parr ◽  
Layer Chromatography ◽  
Atlantic Salmon Parr

As indicated by thin-layer chromatography, hatchery-reared Atlantic salmon parr degraded DDT, absorbed from aqueous suspensions, to DDE and TDE within 9 hr. DDT adsorbed on external surfaces of the salmon was not degraded.

Importance of body size for acclimation of underyearling Atlantic salmon parr (Salmo salar L.) to seawater

Aquaculture ◽  
1992 ◽  
Vol 104 (3-4) ◽  
pp. 357-366 ◽  
Author(s):  
Vilhelm Bjerknes ◽  
James Duston ◽  
Derek Knox ◽  
Paul Harmon
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Salmon Parr ◽  
Atlantic Salmon Parr

Consequences of circadian fluctuations in water temperature on the standard metabolic rate of Atlantic salmon parr (Salmo salar)

2013 ◽  
Vol 70 (7) ◽  
pp. 1072-1081 ◽  
Author(s):  
David Beauregard ◽  
Eva Enders ◽  
Daniel Boisclair
Keyword(s):  
Atlantic Salmon ◽  
Metabolic Rate ◽  
Water Temperature ◽  
Salmo Salar ◽  
Traditional Approach ◽  
Standard Metabolic Rate ◽  
Fish Growth ◽  
Salmon Parr ◽  
Model Components ◽  
Atlantic Salmon Parr

Fish that inhabit rivers may experience important daily fluctuations in water temperature. Bioenergetic models have the potential to simulate the effects of such fluctuations on fish growth; however, bioenergetic components are traditionally modeled using fish kept at constant water temperatures. This study tested the hypothesis that circadian fluctuations in water temperature increase the standard metabolic rate of fish. The standard metabolic rate of Atlantic salmon parr (Salmo salar; 5.96–36.20 g wet blotted mass) estimated at 20 ± 0.5 °C was 25% to 32% lower for fish held at a relatively constant water temperature (20.2 ± 0.5 °C) than for fish maintained under fluctuating thermal regimes (19.8 ± 2.0 °C; 19.5 ± 3.0 °C). This study suggests that a rise in standard metabolic rate may explain how temperature fluctuations affect fish growth. It also indicates that the traditional approach used to estimate and model components of the bioenergetic equation may substantially underestimate the standard metabolic rate of fish that are subjected to such fluctuations.

Effects of Elevated Winter Temperature on Seawater Adaptability, Sexual Rematuration, and Downstream Migratory Behaviour in Mature Male Atlantic Salmon Parr (Salmo salar)

1991 ◽  
Vol 48 (6) ◽  
pp. 1041-1047 ◽  
Author(s):  
I. Berglund ◽  
L. P. Hansen ◽  
H. Lundqvist ◽  
B. Jonsson ◽  
T. Eriksson ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Water Temperature ◽  
Salmo Salar ◽  
Mature Male ◽  
Potential Yield ◽  
Simple Method ◽  
Winter Temperatures ◽  
Salmon Parr ◽  
Winter Water Temperature ◽  
Atlantic Salmon Parr

In experiments with two different salmon (Salmo salar) stocks, elevated winter temperatures (Celsius) 4–9° above the ambient increased the degree of testicular resorption in previously mature male Atlantic salmon parr. Two-summer-old mature male parr maintained at a temperature 9° over the ambient for 5 mo (January–May) showed an increase in hypoosmoregulatory ability when challenged in seawater at the time of smoltification whereas parr kept at elevated temperature for various 2-mo periods (January–February, February–March, or March–April) failed to show this improvement. Furthermore, previously mature males kept at an elevated winter water temperature for either 2 or 5 mo showed a lower incidence of sexual rematuration, and consequently a higher mean growth rate, after one summer in sea pens. A river release experiment showed that rearing previously mature males at 4–7° above the ambient water temperature from December to April increased the number of downstream migrating fish to a level similar to that of immature smolts. We suggest the use of a simple method for enhancing the potential yield of ranched and cultured salmon from early maturing males by removing them from the stock population and rearing them over winter in heated water.

Effects of ice on behaviour of juvenile Atlantic salmon (Salmo salar)

2013 ◽  
Vol 70 (10) ◽  
pp. 1488-1497 ◽  
Author(s):  
Tommi Linnansaari ◽  
Richard A. Cunjak
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Nocturnal Activity ◽  
Atlantic Salmon Salmo Salar ◽  
Daytime Activity ◽  
Ice Conditions ◽  
Salmon Parr ◽  
Surface Ice ◽  
Ice Period ◽  
Atlantic Salmon Parr

The behaviour of Atlantic salmon (Salmo salar) parr was compared among three periods of winter (pre-ice period, PI; period of subsurface ice, SSI; period of surface ice, SI). Salmon parr remained nocturnal regardless of the ice conditions. The level of nocturnal activity was similar during PI and SI periods but was significantly reduced during the SSI period. Immobility was also highest during the SSI period, but was only partly attributable to salmon parr being trapped under ice. No differences in daytime activity among ice periods were observed. Two nocturnal movement tactics were observed: (i) “emerge–settle–return” and (ii) “emerge–move–return”. The tactics were used similarly during PI and SSI periods, but the “move” tactic was predominant during the SI period. Atlantic salmon parr showed a strong tendency to return to their “home stone” after a period of activity. Homing was reduced during the SSI period, but the distance moved to a new home stone was typically <10 m. In general, salmon parr were able to cope well with subsurface and surface ice.

Feed intake of Atlantic salmon parr Salmo salar L. in relation to temperature and feed composition

2002 ◽  
Vol 33 (7) ◽  
pp. 525-532 ◽  
Author(s):  
E Å Bendiksen ◽  
M Jobling ◽  
A M Arnesen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Feed Intake ◽  
Feed Composition ◽  
Salmon Parr ◽  
Atlantic Salmon Parr

Feeding by Hatchery-Reared and Wild Atlantic Salmon (Salmo salar) Parr in Streams

1979 ◽  
Vol 36 (11) ◽  
pp. 1408-1412 ◽  
Author(s):  
A. J. Sosiak ◽  
R. G. Randall ◽  
J. A. McKenzie
Keyword(s):  
Atlantic Salmon ◽  
Key Words ◽  
Salmo Salar ◽  
Food Selection ◽  
Stomach Contents ◽  
Stomach Fullness ◽  
Size Dependent ◽  
Atlantic Salmon Salmo Salar ◽  
Feeding Experience ◽  
Salmon Parr

Hatchery-reared Atlantic salmon (Salmo salar) parr were captured 1–3 mo after release in streams, along with wild parr from the same streams. Identification of their stomach contents showed total number of organisms and number of taxa per stomach were greater and there was a higher index of stomach fullness in wild than in hatchery parr resident ≤ 2 mo in a stream. Wild parr consumed more Brachycentridae, Hydroptilidae, Diptera, and Plecoptera than did hatchery parr, but sometimes less Odontoceridae and Heptageniidae. These differences may have arisen from size-dependent food selection, the effects of feeding experience, or possible microhabitat differences between wild and hatchery parr. Key words: salmon parr, hatchery-reared, wild, feeding

Plasma growth hormone levels increase during seawater exposure of sexually mature Atlantic salmon parr (Salmo salar L.)

1990 ◽  
Vol 80 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Magnus Rydevik ◽  
Bertil Borg ◽  
Carl Haux ◽  
Hiroshi Kawauchi ◽  
Björn Th. Björnsson
Keyword(s):  
Growth Hormone ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Plasma Growth Hormone ◽  
Hormone Levels ◽  
Salmon Parr ◽  
Sexually Mature ◽  
Atlantic Salmon Parr

Relationship of upstream migrating adult Atlantic salmon (Salmo salar) and stream discharge within Catamaran Brook, New Brunswick

2007 ◽  
Vol 64 (3) ◽  
pp. 563-573 ◽  
Author(s):  
Sean C Mitchell ◽  
Richard A Cunjak
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Predictive Ability ◽  
River System ◽  
Low Flow ◽  
Stream Discharge ◽  
Atlantic Salmon Salmo Salar ◽  
Adult Abundance

Stream discharge has long been associated with abundance of returning adult spawning salmonids to streams and may also affect body size distribution of adult salmon as low flows interfere with returns of larger-bodied fish. We examined these relationships of abundance and body size within Catamaran Brook, a third-order tributary to the Miramichi River system of New Brunswick, Canada, to investigate the causes of a declining trend in annual returns of Atlantic salmon (Salmo salar) to this stream. Regression models of adult abundance, proportion of the run as grilse, and body size of returning adults as functions of maximum daily stream discharge during the period of upstream spawner migration were constructed. Adult abundance shows a logarithmic relationship with stream discharge and provides good predictive ability, while appearing to not be significantly related to adult abundance in the larger Miramichi system. The proportion as grilse in the run and female body size are also logarithmically related to stream discharge, with low flow years being very influential in the regressions. These relationships of Atlantic salmon population abundance and body size characteristics have implications with respect to stock integrity and production of the following generation.

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