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
Growth, mortality, and recruitment signals in age-0 gadids settling in coastal Gulf of Alaska
-
2016
-
Source: ICES Journal of Marine Science, 73(9), 2227-2237
[PDF-675.66 KB]
Details:
-
Journal Title:ICES Journal of Marine Science
-
Personal Author:
-
NOAA Program & Office:
-
Description:Age-0 juveniles may be the earliest, reliable indicators of recruitment into commercial marine fisheries, but independent fisheries assessments are usually conducted on older life stages in adult habitats. We used an 8 year juvenile gadid survey along the coast of Kodiak, Alaska to examine annual abundance, growth and mortality in age-0 Pacific cod (Gadus macrocephalus), with comparisons to saffron cod (Eleginus gracilis) and walleye pollock (Gadus chalcogrammus) where possible. Annual abundance of age-0 fish was positively correlated among all three species, suggesting Pacific gadids respond similarly to processes controlling pre-settlement survival and/or delivery to coastal nurseries. In Pacific cod, June temperature was positively correlated with size-at-settlement but post-settlement growth was density- rather than temperature-dependent. Age-0 abundance indices for Pacific and saffron cod predicted the number of age-1 fish the following year (i.e. positive “recruitment signals”), but only in the larger nursery (Anton Larsen Bay) where age-1 gadids were more likely to remain resident after their first year. Recruitment signals for Pacific cod improved with later estimates of age-0 abundance, likely because of high mortality following settlement in July. In contrast, very few age-0 and age-1 walleye pollock were caught across the entire time-series of the survey. Collectively, these data suggest that nearshore surveys may be a tractable means of examining early life history processes and assessing year-class strength in juvenile Pacific and saffron cod, but have relatively low value in understanding the population dynamics of walleye pollock.
-
Keywords:
-
Source:ICES Journal of Marine Science, 73(9), 2227-2237
-
DOI:
-
ISSN:1095-9289;1054-3139;
-
Format:
-
Publisher:
-
Document Type:
-
License:
-
Rights Information:CC0 Public Domain
-
Rights Statement:This work is written by (a) US Government employee(s) and is in the public domain in the US.
-
Compliance:Library
-
Main Document Checksum:
-
Download URL:
-
File Type:
