Combining microvolume isotope analysis and numerical simulation to reproduce fish migration history
Authored by Tatsuya Sakamoto, Kosei Komatsu, Kotaro Shirai, Tomihiko Higuchi, Toyoho Ishimura, Takashi Setou, Yasuhiro Kamimura, Chikako Watanabe, Atsushi Kawabata
Date Published: 2019
DOI: 10.1111/2041-210x.13098
Sponsors:
Japanese Society for the Promotion of Science (JSPS)
Platforms:
No platforms listed
Model Documentation:
Other Narrative
Model Code URLs:
Model code not found
Abstract
Tracking the movement of migratory fish is of great importance for
efficient conservation, although this has been technically difficult to
achieve in small fish to which artificial tags cannot be attached. We
show that migration history can be reproduced by combining
high-resolution otolith stable oxygen isotope ratio (delta O-18)
analysis and numerical simulation. High-precision micromilling and
microvolume carbonate analysing systems had the remarkable capability of
extracting the otolith delta O-18 profiles with 10-30 days resolution.
Furthermore, reasonable movements were reproduced by searching the
routes consistent with the otolith delta O-18 profile, using an
individual-based model with random swimming behaviour. This method will
be a valuable alternative to tagging and electronic loggers for
revealing migration routes in early life stages, thereby providing
crucial information to understand population structures and the
environmental cause of recruitment variabilities, and to validate and
improve fish movement models.
Tags
Migration
IBM
growth
behaviour
Small pelagic fish
Sardine sardinops-melanostictus
Sardine
Swimming
speed
Anchovy engraulis-japonicus
Otolith
Population structure
Oxygen
Isotope
Japanese
sardine
Pacific sardine
Stable carbon
Stock discrimination