Age and growth of Siberian sculpin (Cottus poecilopus) and young brown trout (Salmo trutta) in a subalpine Norwegian river

2004 ◽  
pp. 107-115
Author(s):  
Trygve Hesthagen ◽  
Ola Hegge ◽  
Jostein Skurdal ◽  
Børre K. Dervo
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Age And Growth ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus

Age and growth of Siberian sculpin (Cottus poecilopus) and young brown trout (Salmo trutta) in a subalpine Norwegian river

Hydrobiologia ◽  
2004 ◽  
Vol 521 (1-3) ◽  
pp. 107-115 ◽  
Author(s):  
Trygve Hesthagen ◽  
Ola Hegge ◽  
Jostein Skurdal ◽  
Børre K. Dervo
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Age And Growth ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus

Validation of scale-reading estimates of age and growth in a brown trout Salmo trutta population

Biologia ◽  
2014 ◽  
Vol 69 (5) ◽  
Author(s):  
Libor Závorka ◽  
Ondřej Slavík ◽  
Pavel Horký
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Accurate Method ◽  
Age And Growth ◽  
Percentage Error ◽  
Scale Reading ◽  
Brown Trout Salmo Trutta ◽  
Juvenile Brown Trout ◽  
Measured Length ◽  
Growth Estimation

AbstractIn this study, we validated a scale-reading method estimating age and growth in brown trout Salmo trutta in wild, landlocked, stream-dwelling populations from mountain headwaters in the Elbe catchment area of the Czech Republic. The values estimated from scale reading were compared with measured values, collected using a mark-recapture program over eight consecutive years. The age-corrected absolute percentage error was 10.71%, primarily because the ages of the oldest individuals according to scale reading were underestimated, and the ages of juvenile individuals were slightly overestimated. The back-calculated length was slightly underestimated (the mean error was −4.60 mm), but it was not significantly different from the real measured length. This study suggests that in cold mountain headwaters, scale reading is a sufficiently accurate method for age and growth estimation in juvenile brown trout; however, the results for adult individuals must be taken with caution.

Age and growth properties of brown trout (Salmo trutta L.) living in Kan Stream, upper Çoruh River, Turkey

2007 ◽  
Vol 57 (3) ◽  
pp. 281-291 ◽  
Author(s):  
Murat Arslan ◽  
Ayhan Yildirim
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Growth Parameters ◽  
Fork Length ◽  
Total Weight ◽  
Age And Growth ◽  
Growth Properties ◽  
Brown Trout Salmo Trutta ◽  
Çoruh River ◽  
Male To Female

AbstractAge and growth were analyzed for brown trout from the Stream Kan, upper Çoruh River, from January 2001 to December 2001. Age varied between 0-7 years and the ratio of male to female was 1:1.05. Fork length and total weight for brown trout varied by 6.9-22.1 cm and 4.9-158.5 g for males, by 6.8-26.1 cm and 4.3-211.9 g for females, respectively. Fork length and total weight at the same age classes were not statistically significant between males and females. The highest specific growth rate occurred between age 1 and age 2 for both sexes. The von Bertalanffy equations were used to determine growth in length for both sexes and overall population separately. The growth parameters for males, females and overall population were estimated as L∞ = 32.5 cm, K = 0.169, t0 = −0.978, L∞ = 36.7 cm, K = 0.139, t0 = −1.065 and L∞ = 35.9 cm, K = 0.147, t0 = −1.002, respectively. Overall growth performance (ø) suggested that difference between the growth of brown trout from Kan stream and those from some other populations was found not statistically significant.

Niche overlap between young brown trout (Salmo trutta) and Siberian sculpin (Cottus poecilopus) in a subalpine Norwegian river

Hydrobiologia ◽  
2004 ◽  
Vol 521 (1-3) ◽  
pp. 117-125 ◽  
Author(s):  
Trygve Hesthagen ◽  
Randi Saksgård ◽  
Ola Hegge ◽  
Børre K. Dervo ◽  
Jostein Skurdal
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Niche Overlap ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus
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