Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle

Changes in plasma concentrations of sex steroids, growth rate and condition of repeat spawning (3+) male and female Arctic charr were studied throughout an annual reproductive cycle. Individually marked fish (mean weight approx. 500 g) were held under conditions of liberal food supply, constant temp...

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Published in:Journal of Fish Biology
Main Authors: Tveiten, H., Mayer, I., Johnsen, H. K., Jobling, M.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1998
Subjects:
Online Access:http://dx.doi.org/10.1111/j.1095-8649.1998.tb01827.x
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spelling crwiley:10.1111/j.1095-8649.1998.tb01827.x 2024-06-02T08:00:05+00:00 Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle Tveiten, H. Mayer, I. Johnsen, H. K. Jobling, M. 1998 http://dx.doi.org/10.1111/j.1095-8649.1998.tb01827.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb01827.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb01827.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 53, issue 4, page 714-727 ISSN 0022-1112 1095-8649 journal-article 1998 crwiley https://doi.org/10.1111/j.1095-8649.1998.tb01827.x 2024-05-03T10:59:44Z Changes in plasma concentrations of sex steroids, growth rate and condition of repeat spawning (3+) male and female Arctic charr were studied throughout an annual reproductive cycle. Individually marked fish (mean weight approx. 500 g) were held under conditions of liberal food supply, constant temperature (4° C) and simulated natural photoperiod (Tromsø, 70° N). Once each month fish were weighed, measured and blood samples taken for steroid analysis. Plasma concentrations of testosterone (T), 11‐ketotestosterone (11‐KT) and oestradiol‐17β (E 2 ) were determined using radioimmunoassay (RIA). Both male and female fish displayed distinct seasonal changes in plasma concentrations of sex steroids, growth rate and condition. From February (minimal concentrations) to March all sex steroids increased slightly and these elevated concentrations were maintained until May. Thereafter, there was a second, and far more pronounced, increase in plasma steroid concentrations which culminated in peak steroid concentrations in September–October. There was then a rapid decline during the spawning period. In winter, growth rate and condition were generally low, then increased during the spring, reached a peak during the summer, and then declined with the onset of autumn. During spring (March–May), the frequency distributions of plasma testosterone concentrations in both male and female fish were bimodal. The fish of the upper modal group of the distribution had significantly higher growth rates and condition than those in the lower modal group. In summer and early autumn (June–September) the association between T and growth rate changed. Significant negative correlations between T and growth rates were observed in females. There was an increase in endocrine activity, indicated by elevated plasma sex steroid concentrations in March, 7–8 months prior to maturation. It is suggested that this may be one factor influencing the onset of spring growth and energy deposition among maturing charr. Article in Journal/Newspaper Arctic charr Arctic Tromsø Wiley Online Library Arctic Tromsø Journal of Fish Biology 53 4 714 727
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description Changes in plasma concentrations of sex steroids, growth rate and condition of repeat spawning (3+) male and female Arctic charr were studied throughout an annual reproductive cycle. Individually marked fish (mean weight approx. 500 g) were held under conditions of liberal food supply, constant temperature (4° C) and simulated natural photoperiod (Tromsø, 70° N). Once each month fish were weighed, measured and blood samples taken for steroid analysis. Plasma concentrations of testosterone (T), 11‐ketotestosterone (11‐KT) and oestradiol‐17β (E 2 ) were determined using radioimmunoassay (RIA). Both male and female fish displayed distinct seasonal changes in plasma concentrations of sex steroids, growth rate and condition. From February (minimal concentrations) to March all sex steroids increased slightly and these elevated concentrations were maintained until May. Thereafter, there was a second, and far more pronounced, increase in plasma steroid concentrations which culminated in peak steroid concentrations in September–October. There was then a rapid decline during the spawning period. In winter, growth rate and condition were generally low, then increased during the spring, reached a peak during the summer, and then declined with the onset of autumn. During spring (March–May), the frequency distributions of plasma testosterone concentrations in both male and female fish were bimodal. The fish of the upper modal group of the distribution had significantly higher growth rates and condition than those in the lower modal group. In summer and early autumn (June–September) the association between T and growth rate changed. Significant negative correlations between T and growth rates were observed in females. There was an increase in endocrine activity, indicated by elevated plasma sex steroid concentrations in March, 7–8 months prior to maturation. It is suggested that this may be one factor influencing the onset of spring growth and energy deposition among maturing charr.
format Article in Journal/Newspaper
author Tveiten, H.
Mayer, I.
Johnsen, H. K.
Jobling, M.
spellingShingle Tveiten, H.
Mayer, I.
Johnsen, H. K.
Jobling, M.
Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
author_facet Tveiten, H.
Mayer, I.
Johnsen, H. K.
Jobling, M.
author_sort Tveiten, H.
title Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
title_short Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
title_full Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
title_fullStr Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
title_full_unstemmed Sex steroids, growth and condition of Arctic charr broodstock during an annual cycle
title_sort sex steroids, growth and condition of arctic charr broodstock during an annual cycle
publisher Wiley
publishDate 1998
url http://dx.doi.org/10.1111/j.1095-8649.1998.tb01827.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb01827.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb01827.x
geographic Arctic
Tromsø
geographic_facet Arctic
Tromsø
genre Arctic charr
Arctic
Tromsø
genre_facet Arctic charr
Arctic
Tromsø
op_source Journal of Fish Biology
volume 53, issue 4, page 714-727
ISSN 0022-1112 1095-8649
op_rights http://onlinelibrary.wiley.com/termsAndConditions#vor
op_doi https://doi.org/10.1111/j.1095-8649.1998.tb01827.x
container_title Journal of Fish Biology
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