Journal article
Plasma insulin-like growth factor-1 is unrelated to female reproductive development in a wild population of Dolly Varden charr Salvelinus malma (Walbaum, 1792)
Hydrobiologia, Vol.840(1), pp.137-141
09/01/2019
Handle:
https://hdl.handle.net/2376/105058
Abstract
Insulin-like growth factors (IGFs) are endocrine agents that signal growth in fishes. Because of the interplay between growth and reproduction, endocrine control of the growth axis is thought to have a connection to the reproductive axis. Seasonal patterns and relationships between IGF-1, fish condition, and gonadal development were investigated in a wild population of female Dolly Varden charr Salvelinus malma (Walbaum, 1792) during the summer growing season prior to spawning. Fish were sampled from Florence Lake, Alaska on five sequential sampling trips during April–October 2006. Body and gonad morphometric measurements, and blood plasma samples were obtained for IGF-I quantification. IGF-I increased during summer with fish condition. The gonadosomatic index indicated a pattern of advancing reproductive development in one cohort of fish by August, which indicated impending spawning compared to an immature (non-reproductive) cohort. However, plasma IGF-I levels were not predictive of the sexually maturing cohort. We conclude that IGF-I is not a useful endocrine marker of advancing reproductive state in female Dolly Varden charr but does relate to fish condition during the summer growth period.
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Details
- Title
- Plasma insulin-like growth factor-1 is unrelated to female reproductive development in a wild population of Dolly Varden charr Salvelinus malma (Walbaum, 1792)
- Creators
- James Nagler - 0000 0001 2284 9900 grid.266456.5 Department of Biological Sciences and Center for Reproductive Biology University of Idaho 875 Perimeter Drive MS 3051 Moscow ID 83844-3051 USAPeter Bangs - Alaska Department of Fish and Game Division of Sport Fish P.O. Box 110024 Juneau AK 99811 USALea Medeiros - 0000 0001 2284 9900 grid.266456.5 Department of Biological Sciences and Center for Reproductive Biology University of Idaho 875 Perimeter Drive MS 3051 Moscow ID 83844-3051 USAAndrew Pierce - 0000 0000 9899 6002 grid.448477.c Columbia River Inter-Tribal Fish Commission Portland OR USA
- Contributors
- Colin E Adams (Editor)Charles R Bronte (Editor)Michael J Hansen (Editor)Rune Knudsen (Editor)Michael Power (Editor)
- Publication Details
- Hydrobiologia, Vol.840(1), pp.137-141
- Academic Unit
- UNKNOWN
- Publisher
- Springer International Publishing; Cham
- Grant note
- Columbia River Inter-Tribal Fish Commission (http://dx.doi.org/10.13039/100007629)
- Identifiers
- 99900546963501842
- Language
- English
- Resource Type
- Journal article