Abundance and Population Dynamics of Parasites Infecting Atlantic Salmon (Salmo salar) in Trout Brook, New Brunswick, Canada

1975 ◽  
Vol 32 (11) ◽  
pp. 2069-2074 ◽  
Author(s):  
G. M. Hare ◽  
M. D. B. Burt
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Seasonal Changes ◽  
Seasonal Abundance ◽  
Host Age ◽  
Intensity Of Infection ◽  
Annual Cycles ◽  
Atlantic Salmon Salmo Salar ◽  
Host Sex ◽  
Age And Sex

Ten species of parasites (8 helminth, 1 annelid, 1 mollusc) were collected from 375 juvenile Atlantic salmon (Salmo salar) in Trout Brook, N.B., during May–November 1970 and 1971. The most commonly occurring parasites were the monogenean Discocotyle sagittata (infecting 37.7% of the fish examined), the digenean Crepidostomum farionis (40.5%), the nematode Sterliadochona tenuissima (97.9%), and a glochidium (32.0%). Intensity of infection (mean number of parasites for all fish examined) of C. farionis and S. tenuissima was independent of host age and sex, and of D. sagittata was independent of age, but male salmon were more heavily infected than females. The intensity of infection of these parasites showed no interactions between host age and season nor between host sex and season. The abundance of the parasites showed marked seasonal changes: D. sagittata was most abundant in summer and autumn, C. farionis and S. tenuissima were most abundant in spring, and the glochidium was most abundant in autumn. Relationships between changes in parasite maturation and in seasonal abundance indicated annual cycles of infection.

Abundance and Potential Pathology of Parasites Infecting Salmonids in Canadian Maritime Hatcheries

1974 ◽  
Vol 31 (6) ◽  
pp. 1031-1036 ◽  
Author(s):  
G. M. Hare ◽  
C. Frantsi
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Brook Trout ◽  
Parasite Species ◽  
Salvelinus Fontinalis ◽  
Infection Intensity ◽  
Salmo Gairdneri ◽  
Host Age ◽  
Intensity Of Infection ◽  
First Time

Seventeen parasite species (3 protozoans, 11 helminths, 2 arthropods, and 1 mollusc) were collected from 317 Atlantic salmon (Salmo salar), 207 brook trout (Salvelinus fontinalis), and 34 rainbow trout (Salmo gairdneri) in the 13 Canadian Maritime hatcheries during 1972. Four parasites, Camallanus oxycephalus, Pomphorhynchus bulbocolli, Hydrachna sp., and a glochidium, were recorded from Atlantic salmon for the first time. Incidence and intensity of infection were high for Trichophyra piscium, Diplostomulum spathaceum, and glochidia infecting salmon and for Acanthocephalus lateralis and Salmincola edwardsii infecting brook trout. Infection intensity of Apophallus imperator, D. spathaceum, S. edwardsii, and glochidia increased with host age. Apophallus imperator and S. edwardsii were host specific to brook trout and the glochidium was host specific to salmon. Sterliadochona tenuissima and A. lateralis were more abundant in brook trout than in salmon. Pathology was associated with infections of Hexamita salmonis, D. spathaceum, A. lateralis, and S. edwardsii.

Effects of Constant Day Length on Sexual Maturation and Growth of Atlantic Salmon (Salmo salar) Parr

1988 ◽  
Vol 45 (1) ◽  
pp. 60-64 ◽  
Author(s):  
R. L. Saunders ◽  
E. B. Henderson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Seasonal Changes ◽  
The Other ◽  
Day Length ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding ◽  
Sexually Mature

Atlantic salmon (Salmo salar) were reared for 6 mo from first feeding under four photoperiod regimes: LD 12:12, LD 16:8, LD 24:0, and simulated natural (LDN). Water temperature followed seasonal changes but was adjusted so as not to exceed 16 °C in summer or to fall below 6 °C in winter. Growth rates were highest in the LD 24:0 group during the first 3 mo; subsequently, the LD 16:8 fish grew faster than all others. Length–frequency distributions were skewed towards smaller sized fish in January. Sexually mature males were mainly in the lower halves of the length–frequency distributions; females and immature males were distributed throughout. The incidence of mature males was highest in the LDN group (67% of males) but reached high levels (44–58%) in the other groups.

Lake Use by Wild Anadromous Atlantic Salmon, Salmo salar, as an Index of Subsequent Adult Abundance

1986 ◽  
Vol 43 (1) ◽  
pp. 2-11 ◽  
Author(s):  
P. M. Ryan
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Seasonal Changes ◽  
Catch Per Unit Effort ◽  
Age Composition ◽  
Atlantic Salmon Salmo Salar ◽  
Spawning Areas ◽  
Population Sizes ◽  
Standing Waters ◽  
Adult Abundance

Atlantic salmon, Salmo salar, were censused each spring and fall for 5 or 6 yr in two lakes at the headwaters of the Gander River, Newfoundland. Density, biomass, and age varied seasonally and annually, ranging from 5.2 to 78.7 fish∙ha−1, 0.2 to 3.4 kg∙ha−1, and 1 to 7 yr, respectively. Seasonal changes in age composition were used to calculate net numbers and ages of fish moving into and out of the lakes. Population sizes typically increased from fall to spring as young fish moved into the lakes from downstream spawning areas and decreased from spring to fall as older fish moved downstream. The calculated net number of spring to fall emigrants over 6 yr was positively correlated (r = 0.835) with adult abundance (catch per unit effort) in the recreational fishery 1 yr later. The varying modal age of these emigrants was identical to the modal freshwater age of returning adults in each of four comparable years. Censusing of young Atlantic salmon in standing waters can be used to monitor smolt production and assist in prediction of the subsequent abundance of sea-run adults.

Microstructure and texture of fresh and smoked Atlantic salmon, Salmo salar L., fillets from fish reared and slaughtered under different conditions

2001 ◽  
Vol 32 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Sjofn Sigurgisladottir ◽  
Margret S. Sigurdardottir ◽  
Helga Ingvarsdottir ◽  
Ole J. Torrissen ◽  
Hannes Hafsteinsson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar
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