scholarly journals Effect of ectoparasite infestation density and life‑history stages on the swimming performance of Atlantic salmon Salmo salar

2016 ◽  
Vol 8 ◽  
pp. 387-395 ◽  
Author(s):  
S Bui ◽  
T Dempster ◽  
M Remen ◽  
F Oppedal
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Swimming Performance ◽  
Life History Stages ◽  
Atlantic Salmon Salmo Salar ◽  
Infestation Density ◽  
Ectoparasite Infestation

Effect of time of day, time of year, and life history strategy on time budgeting in juvenile Atlantic salmon, Salmo salar

1999 ◽  
Vol 56 (12) ◽  
pp. 2397-2403 ◽  
Author(s):  
Sveinn K Valdimarsson ◽  
Neil B Metcalfe
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Life History Strategy ◽  
Time Of Day ◽  
Life History Strategies ◽  
Foraging Efficiency ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Time Of Year

Traditionally, behavioural studies on juvenile Atlantic salmon, Salmo salar, have been conducted during the day in summer. It is known that Atlantic salmon become nocturnal in winter, but very little is known about their behaviour at that time. Therefore, observations in a seminatural stream were carried out during the day and night, from February to June, comparing diel and seasonal differences in behaviour between fish adopting alternative life history strategies. The results showed a general trend for more activity in spring than in winter, and the fish were found to be foraging at surprisingly low light levels. There were differences in relative feeding rate between the life history strategies; the early migrant fish foraged mostly during the day whereas the delayed migrant fish did more foraging at night. There is some evidence that the early migrant fish made fewer feeding attempts over the winter, which is surprising, since they grow faster over that period. This suggests differences in foraging efficiency, which could contribute to the separation into these two life history strategies.

Behavioural influences on life-history variation in juvenile Atlantic salmon, Salmo salar

1992 ◽  
Vol 33 (4) ◽  
pp. 331-340 ◽  
Author(s):  
John E. Thorpe ◽  
Neil B. Metcalfe ◽  
Felicity A. Huntingford
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Life History Variation ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon

Effect of Dummy Telemetry Transmitters on Stamina of Atlantic Salmon (Salmo salar) Smolts

1975 ◽  
Vol 32 (4) ◽  
pp. 559-563 ◽  
Author(s):  
James D. McCleave ◽  
Kristin A. Stred
Keyword(s):  
Regression Analysis ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Swimming Performance ◽  
Linear Regression Analysis ◽  
Control Groups ◽  
Radio Transmitter ◽  
Atlantic Salmon Salmo Salar ◽  
Radio Transmitters ◽  
Better Than

Effects of three different-sized, internally placed dummy ultrasonic transmitters and one size externally placed dummy radio transmitter on swimming performance of Atlantic salmon (Salmo salar) smolts were determined. Critical swimming speeds were similar for fish in control groups and two of the groups tagged with internal transmitters. The widest internal dummy tag (19 mm long × 10 mm diameter) caused a significant (P < 0.05) decrement in swimming performance; the size representing the smallest available transmitters (33 mm long × 8 mm diameter) did not. Linear regression analysis of this latter group demonstrated that larger smolts carried the transmitter better than smaller smolts. Results indicated that fish longer than about 20 cm can successfully be tagged with the available transmitter. Externally placed dummy radio transmitters caused a highly significant (P < 0.01) decrease in swimming speed compared with that of controls.

Importance of the Variation in Life History Parameters of Atlantic Salmon (Salmo salar)

1985 ◽  
Vol 42 (3) ◽  
pp. 615-618 ◽  
Author(s):  
Richard L. Saunders ◽  
Charles B. Schom
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Population Size ◽  
Salmo Salar ◽  
Great Variability ◽  
Mature Male ◽  
Life History Parameters ◽  
Atlantic Salmon Salmo Salar ◽  
Sexually Mature ◽  
Mature Male Parr

Atlantic salmon (Salmo salar) demonstrate great variability in their life history; individuals from a given year-class can spawn during several years and can, therefore, breed with salmon from other year-classes. Atlantic salmon can mature after 1–4 sea-winters and some males mature as parr, during the second through fifth years, before going to sea. Salmon may survive to spawn more than once; some spawn several times. This variability in life history may be a safeguard against loss of small stocks through several successive years of reproductive failure, since nonspawning individuals in the river or at sea could spawn in subsequent years. Spawning populations are frequently quite small. The effective spawning population size may be potentially much larger, however, since members of several year-classes, including sexually mature male parr and anadromous adults of various ages, contribute to spawning. The level of inbreeding may be relatively low, since a number of year-classes, each with different sets of parents, are represented during spawning.

Genetically distinct sympatric populations of resident and anadromous Atlantic salmon, Salmo salar

1989 ◽  
Vol 67 (6) ◽  
pp. 1453-1461 ◽  
Author(s):  
E. Verspoor ◽  
L. J. Cole
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
River System ◽  
Population Variation ◽  
The Other ◽  
Gene Pools ◽  
Sympatric Populations ◽  
Polymorphic Loci ◽  
Atlantic Salmon Salmo Salar

Atlantic salmon (Salmo salar) from Little Gull Lake on the Gander River system of central Newfoundland were found to be electrophoretically polymorphic at 5 of 20 protein loci screened. Four of the polymorphic loci were structural and one was regulatory. Major heterozygote deficiencies relative to Castle–Hardy–Weinberg expectations were detected at the two most polymorphic loci, Aat-3 and Mdh-3,4, and significant nonrandom associations between genotypes at these loci and the other polymorphic loci, Sdh-1, Me-2, and Pgm1-t, were also found. The heterozygote deficiencies and the nonrandom genotype associations were attributable to the admixture of genetically distinct gene pools of resident and anadromous salmon in the lake. This is the first documented case of coexistence of reproductively separated populations of Atlantic salmon of the two life history types, and shows that the sympatric occurrence of the two forms can represent between-population variation.

Seasonal and Developmental Variation in the Lethality of Zinc to Juvenile Atlantic Salmon (Salmo salar)

1977 ◽  
Vol 34 (1) ◽  
pp. 139-141 ◽  
Author(s):  
V. Zitko ◽  
W. G. Carson
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Developmental Stage ◽  
Salmo Salar ◽  
Water Hardness ◽  
Developmental Variation ◽  
Atlantic Salmon Salmo Salar ◽  
Sensitive Stage ◽  
Juvenile Atlantic Salmon ◽  
Lethal Level

The incipient lethal level (ILL) of zinc to juvenile Atlantic salmon (Salmo salar) in fresh water at a water hardness of 14 mg/ℓ varies from 150 to 1000 μg/ℓ as a function of season and developmental stage of the fish. The ILL increases from 500 to 1000 μg/ℓ during the 1st yr and decreases to 150 μg/ℓ in the following spring. The more sensitive stage in the salmon's life history, evidenced by decrease of ILL coincides with and is probably related to initial stages of the parr–smolt transformation.

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