From migrants to mossbacks: tracer- and taginferred habitat shifts in the California yellowtail Seriola dorsalis

Madigan, DJ; Snodgrass, OE; Fisher, NS

doi:10.3354/meps12593

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

From migrants to mossbacks: tracer- and taginferred habitat shifts in the California yellowtail Seriola dorsalis

2018
By Madigan, DJ ; Snodgrass, OE ; Fisher, NS
Source: Marine Ecology Progress Series, 597, 221-230

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Details:

Journal Title:

Marine Ecology Progress Series
Personal Author:

Madigan, DJ ; Snodgrass, OE ; Fisher, NS

Madigan, DJ ; Snodgrass, OE ; Fisher, NS Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

The California yellowtail Seriola dorsalis (YT) is an economically and ecologically valuable predator in both coastal and pelagic regions of the California Current Ecosystem. Delineating size-structured migration patterns can help assess population connectivity and predict effects of regional fishing pressure. We used chemical tracers (stable isotope analysis and mercury analysis) and conventional tagging to evaluate the dynamics of a potential ontogenetic shift in habitat from pelagic waters to coastal regions. Stable isotope analysis revealed a shift in habitat use at intermediate sizes (fork length, FL = 76 to 87.5 cm). Smaller YT were isotopically similar to pelagic yellowfin tuna Thunnus albacares, while larger YT were isotopically similar to the coastal white seabass Atractoscion nobilis. Tag recaptures from a small number of fish (48 deployments, 15 recaptures) corroborated an ontogenetic shift from offshore to coastal habitats, suggesting local, residential populations of larger YT in nearshore areas. Mercury concentrations increased directly after the observed habitat shift (FL = 88.3 cm), which is likely a result of both bioaccumulation with age and a shift to higher Hg prey inshore. Residential behavior of mature YT > 80 cm (~4 to 12+ yr old) suggests that regional size distributions could be influenced by local fishing pressure and inshore movement dynamics, as recruitment of migrants from southern waters will likely be comprised of smaller, younger fish.
Source:

Marine Ecology Progress Series, 597, 221-230
DOI:

https://doi.org/10.3354/meps12593
ISSN:

0171-8630;1616-1599;
Format:

PDF
Publisher:

Inter-Research Science Center
Document Type:

Journal Article
Rights Information:

Other
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Library
Main Document Checksum:

[+]

urn:sha-512:90d6fd452bc42ca065b2cb1622245ef4f0f5f150b77c770a790311d8fd797d46788e362a3839708cbde13382605b584607ef7e749b295e9a396546586abbc677
Download URL:

https://repository.library.noaa.gov/view/noaa/65349/noaa_65349_DS1.pdf
File Type:

[PDF-514.17 KB]