d13C and d15N of Pacific halibut skeletal muscle tissue from the Gulf of Alaska, 2018

In 2018, white muscle samples were collected from the lateral musculature of a random sample of up to 4 fish from each survey station of the International Pacific Halibut Commission's Fishery Independent Setline Survey (total n = 1653). Muscle samples were stored at -20°C, thawed, oven-dried to a constant mass at 42°C, and ground to a fine powder. Approximately 0.5 to 1.0 mg of each powdered sample was loaded into a tin capsule for stable isotope analysis. d13C and d15N values were determined using a Carlo Erba 1110 Elemental Analyzer (Carlo Erba Reagents, CE Instruments, ThermoQuest Italia S.p.A. Milan, Italy) coupled to a Thermo Delta Plus XP IRMS (Thermo Finnigan, Bremen, German) at the University of Wyoming’s Stable Isotope Facility (Laramie, Wyoming, USA). Long-term analyses of quality control standards have yielded precisions of 0.3‰ for d13C and 0.4‰ for d15N. Stable isotope data are presented in ‰ relative to Pee Dee Belemnite for 13C and atmospheric nitrogen for 15N., Muscle samples were stored at -20°C, thawed, oven-dried to a constant mass at 42°C, and ground to a fine powder. Approximately 0.5 to 1.0 mg of each powdered sample was loaded into a tin capsule for stable isotope analysis. d13C and d15N values were determined using a Carlo Erba 1110 Elemental Analyzer (Carlo Erba Reagents, CE Instruments, ThermoQuest Italia S.p.A. Milan, Italy) coupled to a Thermo Delta Plus XP IRMS (Thermo Finnigan, Bremen, German) at the University of Wyoming’s Stable Isotope Facility (Laramie, Wyoming, USA). Long-term analyses of quality control standards have yielded precisions of 0.3‰ for d13C and 0.4‰ for d15N. Stable isotope data are presented in ‰ relative to Pee Dee Belemnite for 13C and atmospheric nitrogen for 15N., , # d13C and d15N of Pacific halibut skeletal muscle tissue from the Gulf of Alaska, 2018

[https://doi.org/10.5061/dryad.h9w0vt4qp](https://doi.org/10.5061/dryad.h9w0vt4qp)

## Description of the data and file structure

Data are provided as a CSV file with rows representing individual fish and columns representing 1) age (years; as determined by otolith), 2) sex, 3) fork length (cm), 4) d15N (per mil), 5) d13C (per mil), 6) nitrogen concentration ([N]), 7) carbon concentration ([C]), and 8) C:N concentration ratio.

## Sharing/Access information

Corresponding data for each fish including 1) International Pacific Halibut Commission Fisheries Independent Setline Survey Station, 2) latitude of first anchor of capture gear, 3) longitude of first anchor of capture gear, 4) minimum depth at which capture gear was placed (fathoms) are publicly available on the International Pacific Halibut Commission's website ([https://iphc.int/data/datatest/fishery-independent-setline-survey-fiss](https://...