Probability of First Sexual Maturation of Male Parr in Wild Sea-run Brown Trout (Salmo trutta) Depends on Condition Factor 1 yr in Advance

1994 ◽  
Vol 51 (9) ◽  
pp. 1920-1926 ◽  
Author(s):  
Torgny Bohlin ◽  
Claes Dellefors ◽  
Ulo Faremo
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Condition Factor ◽  
Mature Male ◽  
Small Stream ◽  
Late Autumn ◽  
Passive Integrated Transponders ◽  
Brown Trout Salmo Trutta ◽  
Mature Male Parr ◽  
Electric Fishing

In three years, in late autumn, underyearling wild sea-run brown trout (Salmo trutta) in a small stream were captured with electric fishing and tagged with microchips (passive integrated transponders). They were recaptured during the following season either as migrating smolts in a trap or by electric fishing in the stream just after the migration period and during spawning (late autumn). At spawning, they were distinguished as sexually mature male parr or immature juveniles. The smolts were longer and heavier at tagging than the mature male parr and the immature parr, which were similar in initial length and weight. The mature male parr had a significantly higher condition factor at tagging than the immature parr. The probability of parr maturation was positively associated with initial condition factor but not with initial body length. Growth of mature male parr and immature parr was similar in the early season but higher for immature parr in the late season. The result indicated that the choice of strategy was made earlier in life than previously recognized.

scholarly journals Morphometric and Physiological Characteristics of Brown Trout (Salmo trutta) from the Ponor River

2017 ◽  
Vol 17 (3) ◽  
pp. 233
Author(s):  
Radoslav Dekić ◽  
Maja Manojlović ◽  
Jasna Friščić ◽  
Svjetlana Lolić ◽  
Dragojla Golub
Keyword(s):  
Body Mass ◽  
Body Length ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Condition Factor ◽  
Hematological Parameters ◽  
Hemoglobin Concentration ◽  
Mean Corpuscular Hemoglobin ◽  
Average Value ◽  
Brown Trout Salmo Trutta

This paper presents the data related to morphometric and physiological (hematological) characteristics of brown trout (Salmo trutta) from the Ponor River. This river rises near the village Podrašnica (municipality of Mrkonjić Grad), sinks above the ground and after a while, near the settlement of Krupa na Vrbasu, appears as a source of the Krupa River (tributary of the Vrbas River). Fish sampling was performed during the summer of 2015 and during this period 22 Salmo trutta units were caught (11 females and 11 males). On that occasion, several morphometric (total and standard body length) and hematological traits (Hct-hematocrit, Hb-hemoglobin and MCHC - mean corpuscular hemoglobin concentration), body mass and Fulton’s condition factor were analyzed. The average value for total body length was 18.85 cm and for standard body length it was 16.85 cm; the mean value for body mass was 80.38 g, and for Fulton’s condition factor 1.41. In case of hematological parameters, the average value for Hct was 0.39 l/l, Hb 70.62 g/l and MCHC 180.64 g/l erythrocytes. The estimated parameters can serve as indicators for the condition of these aquatic organisms, and indirectly, the state of their environment.

Interpopulation variation in male parr maturation of anadromous brown trout (Salmo trutta) in Norway

1990 ◽  
Vol 68 (9) ◽  
pp. 1983-1987 ◽  
Author(s):  
Jan Henning L'Abée-Lund ◽  
Arne Johan Jensen ◽  
Bjørn Ove Johnsen
Keyword(s):  
Fresh Water ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Mature Male ◽  
Good Growth ◽  
Effective Population ◽  
Poor Growth ◽  
Total Length ◽  
Mature Male Parr ◽  
Smolt Age

We studied male parr maturation in anadromous brown trout in nine Norwegian rivers. Mean age at maturity increased from 1.5 years in southern populations to 5.2 years in northern populations, but the latitudinal correlation was not significant. Mean age of male parr at maturity was negatively correlated with mean total length of 0- and 1-year-old parr. The proportion of mature male parr varied between 0.06 and 0.6 among populations, and was positively correlated with mean total length of 0- and 1-year-old parr. The proportion of mature male parr decreased significantly with increasing mean smolt age of males. This indicates that in populations with relatively poor growth in fresh water (i.e., high smolt age) males mainly spawn as sea-run migrants, whereas in populations with relatively good growth in fresh water the mature male parr potentially contribute twice to the genetic makeup of the population, further increasing the effective population size.

The impact of introduced pike (Esox lucius L.) on allopatric brown trout (Salmo trutta L.) in a small stream

Hydrobiologia ◽  
2014 ◽  
Vol 744 (1) ◽  
pp. 223-233 ◽  
Author(s):  
Trygve Hesthagen ◽  
Odd T. Sandlund ◽  
Anders G. Finstad ◽  
Bjørn O. Johnsen
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Esox Lucius ◽  
Small Stream ◽  
Pike Esox Lucius ◽  
Brown Trout Salmo Trutta ◽  
The Impact

Small-scale dispersal and population structure in stream-living brown trout (Salmo trutta) inferred by mark–recapture, pedigree reconstruction, and population genetics

2012 ◽  
Vol 69 (9) ◽  
pp. 1513-1524 ◽  
Author(s):  
Leif Asbjørn Vøllestad ◽  
Dimitar Serbezov ◽  
Arthur Bass ◽  
Louis Bernatchez ◽  
Esben Moland Olsen ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Isolation By Distance ◽  
Juvenile Fish ◽  
Age Groups ◽  
Small Scale ◽  
Mark Recapture ◽  
Small Stream ◽  
Brown Trout Salmo Trutta ◽  
Mature Fish

Many animals move among habitats, and even small-scale dispersal of individuals between habitat patches may have strong implications for population dynamics and structure. Here, we use long-term mark–recapture data combined with extensive genotyping and parentage assignment to investigate the importance of small-scale location change of resident brown trout ( Salmo trutta ) in a small stream (1500 m). During the first summer, juvenile fish dispersed downstream (mean displacement 200 m), with smaller juveniles dispersing longer distances. Downstream movement was also predominant during the first winter, but older fish moved little. This limited dispersal resulted in a significant isolation-by-distance structure for ages 1 and 2, but not for older age groups or for the mature fish. Individual pairwise relatedness coefficients decreased with waterway distance for mature fish during the 2002 and 2003 spawning seasons, but only weakly. Overall, between-site genetic differentiation was stronger for the younger age classes, and the signal decayed with age, indicating that the genetic structure observed in the stream is mainly driven by spatial aggregation of close relatives.

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