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Relationships between growth traits and scale stable isotopes (δ13C, δ15N) of adult chum salmon Oncorhynchus keta in Hokkaido, Japan

Relationships between growth traits and scale stable isotopes (δ13C, δ15N) of adult chum salmon... Stable isotope analysis (SIA) in combination with growth analysis using scales collected from adult chum salmon Oncorhynchus keta migrating back to Hokkaido, Japan, was performed to describe the variation of isotopic composition of carbon (δ13C) and nitrogen (δ15N) in scales and to examine relationships with growth traits [age, fork length (FL), and relative growth ratio in the last growth period [(RGRlast)]. Scale stable isotope (SI) values in 3‐ to 6‐year‐old fish were highly variable, ranging from −17.6‰ to −14.3‰ for δ13C and 9.5‰ to 13.4‰ for δ15N. The δ15N was positively correlated with FL, and this tendency may indicate changes in trophic level with growth. Significant effect was not detected between δ15N and RGRlast, it can be inferred that factors potentially yielding high δ15N may not necessarily result in higher growth rates. No trend found between FL and δ13C may imply that there is no clear segregation in feeding locations between the 3‐ to 6‐year groups. This study provided basic information for scale SI values of chum salmon adults and indicated that SIA using scales could be a new approach to elucidating the trophic ecology of chum salmon. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Relationships between growth traits and scale stable isotopes (δ13C, δ15N) of adult chum salmon Oncorhynchus keta in Hokkaido, Japan

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References (29)

Publisher
Wiley
Copyright
"Copyright © 2019 Blackwell Verlag GmbH"
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/jai.13860
Publisher site
See Article on Publisher Site

Abstract

Stable isotope analysis (SIA) in combination with growth analysis using scales collected from adult chum salmon Oncorhynchus keta migrating back to Hokkaido, Japan, was performed to describe the variation of isotopic composition of carbon (δ13C) and nitrogen (δ15N) in scales and to examine relationships with growth traits [age, fork length (FL), and relative growth ratio in the last growth period [(RGRlast)]. Scale stable isotope (SI) values in 3‐ to 6‐year‐old fish were highly variable, ranging from −17.6‰ to −14.3‰ for δ13C and 9.5‰ to 13.4‰ for δ15N. The δ15N was positively correlated with FL, and this tendency may indicate changes in trophic level with growth. Significant effect was not detected between δ15N and RGRlast, it can be inferred that factors potentially yielding high δ15N may not necessarily result in higher growth rates. No trend found between FL and δ13C may imply that there is no clear segregation in feeding locations between the 3‐ to 6‐year groups. This study provided basic information for scale SI values of chum salmon adults and indicated that SIA using scales could be a new approach to elucidating the trophic ecology of chum salmon.

Journal

Journal of Applied IchthyologyWiley

Published: Apr 1, 2019

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