Assessment of egg quality in Atlantic salmon, Salmo salar, treated with testosterone: biochemical composition

1993 ◽  
Vol 71 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Rakesh K. Srivastava ◽  
Joseph A. Brown
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Egg Quality ◽  
Quality Parameters ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding ◽  
Protein Energy ◽  
Treated Fish ◽  
And Control ◽  
Control Sham

In the present study, eggs were collected from testosterone-treated Atlantic salmon (Salmo salar) and control (sham implanted) fish, and egg-quality parameters were compared. Egg weight and diameter, as well as protein, lipid, carbohydrate, dry matter, and ash contents, of eggs from testosterone-treated fish were significantly less than those of eggs from controls. Intensive utilization of protein energy for metabolism during egg development and predominant utilization of lipid energy after hatching was noted. Polyamines, putrescine, spermidine, and spermine contents in eggs from control and treated fish did not differ. However, embryos and alevins from testosterone-treated fish synthesized more polyamines than did controls during development. There were no significant differences in fertilization and hatching success, or in survival to the eyed stage and first feeding. The development of embryos from treated fish was slower than that of controls, but higher growth rates and greater development of alevins from treated groups were observed after hatching.

Hypervitaminosis A in first-feeding fry of the Atlantic salmon (Salmo salar L.)

2002 ◽  
Vol 8 (1) ◽  
pp. 7-13 ◽  
Author(s):  
R. ØRNSRUD ◽  
I. E. GRAFF ◽  
S. HØIE ◽  
G. K. TOTLAND ◽  
G.-I. HEMRE
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Hypervitaminosis A ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding

First feeding of Atlantic salmon, Salmo salar L., under different photoperiods and light intensities

1990 ◽  
Vol 21 (4) ◽  
pp. 435-441 ◽  
Author(s):  
S. O. STEFANSSON ◽  
R. NORTVEDT ◽  
T. J. HANSEN ◽  
G. L. TARANGER
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding ◽  
Light Intensities

Effects of Low Environmental pH on Smolting of Atlantic Salmon (Salmo salar)

1983 ◽  
Vol 40 (8) ◽  
pp. 1203-1211 ◽  
Author(s):  
Richard L. Saunders ◽  
Eugene B. Henderson ◽  
Paul R. Harmon ◽  
C. Edward Johnston ◽  
J. Geoffrey Eales
Keyword(s):  
Atlantic Salmon ◽  
Atpase Activity ◽  
Salmo Salar ◽  
Constant Temperature ◽  
Water Hardness ◽  
Low Ph ◽  
Temperature Plasma ◽  
Atlantic Salmon Salmo Salar ◽  
Temperature Regimes ◽  
And Control

We reared Atlantic salmon (Salmo salar) in soft water (hardness 13 mg/L as CaCO3) at two pH levels, 6.4–6.7 and 4.2–4.7, from February to June, to assess the effect of low pH on survival, growth, and the smolting process under rising (4–8.5 °C) or relatively constant (9.5–10.5 °C) temperature. Survival was lower as a result of low pH (4.2–4.7) under both temperature regimes. Neither group exposed to low pH gained weight whereas both control groups gained weight during the experiment. Parr–smolt transformation, as indicated by salinity tolerance and gill Na+, K+ ATPase activity, was impaired as a result of low pH. The large (17–19 cm) parr used in this study were initially salinity tolerant and those at control pH (6.4–6.7) increased tolerance to 35‰ salinity between March and May; those in low pH became intolerant of high salinity. ATPase levels in salmon reared at low pH were significantly lower than those at normal pH levels under both temperature regimes. ATPase activity was significantly greater in fish reared at pH 6.4–6.7 with rising than with constant temperature. Plasma chloride and sodium levels were low in response to low pH, indicating impaired ionic regulation in freshwater. Plasma calcium levels were higher at low pH in both temperature regimes; higher levels were reached under constant temperature. Moisture content rose less sharply under low than under control pH in both temperature regimes. In the rising temperature regime, lipid levels reached similar, low levels under low and control pH conditions. Thyroid hormone (T3 and T4) levels gave no clear indication of effects of low pH on smolting. Smoltification did not proceed normally in our Atlantic salmon subjected to low pH levels.

Yolk Absorption, Yolk Sac Constrictions, Mortality, and Growth During First Feeding of Atlantic Salmon (Salmo salar) Incubated on Astro-turf

1985 ◽  
Vol 42 (6) ◽  
pp. 1073-1078 ◽  
Author(s):  
T. J. Hansen ◽  
D. Møller
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Lateral Force ◽  
Yolk Sac ◽  
Artificial Substrate ◽  
Feeding Period ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding ◽  
Flat Screen ◽  
Yolk Absorption

Groups of pooled Atlantic salmon (Salmo salar) eggs were incubated in a "California" incubation system with and without astro-turf, an artificial substrate, and later transferred to separate feeding units. Alevins reared in astro-turf absorbed their yolk sac faster and more efficiently than alevins reared on a flat screen. Alevins reared on the flat screen developed yolk sac constrictions probably due to the backward and lateral force created by the high swimming activity. No such malformations were found on the yolk sacs of the astro-turf reared alevins. The fry hatched without astro-turf grew faster than the fry hatched with astro-turf during the initial feeding period, but later this was reversed. Mortality of alevins and fry hatched with astro-turf was lower during incubation and during first feeding.

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