Modeling of Recruitment Patterns in Pacific Cod (Gadus macrocephalus) in Hecate Strait, British Columbia

1991 ◽  
Vol 48 (11) ◽  
pp. 2240-2249 ◽  
Author(s):  
A. V. Tyler ◽  
W. R. Crawford
Keyword(s):  
Response Surface ◽  
Clupea Harengus ◽  
Data Series ◽  
Pacific Cod ◽  
Modeling Framework ◽  
Pacific Cod Gadus Macrocephalus ◽  
Period 2 ◽  
Clupea Harengus Pallasi ◽  
Gadus Macrocephalus ◽  
Prediction Test

We combined published recruitment hypotheses into a single modeling framework and explored the relative contributions of the hypothesis factors to recruitment variation in Pacific cod (Gadus macrocephalus). Our five hypotheses were (1) recruitment decreased with increasing transport during the larval period; (2) recruitment was related to percentage hatching success as a dome-shaped curve with a peak between 4.0 and 5.0 °C; (3) recruitment was positively related to abundance of age-0 juvenile Pacific herring (Clupea harengus pallasi) hatched in the same year as the cod; (4) recruitment was positively related to abundance of age-0 and age-1 herring in the year prior to spawning; and (5) a dome-shaped curve related recruitment to adult stock size. We used new records for temperature, and a new index of advection based on measures of current in Hecate Strait. For fitting a response surface with age-3 cod recruitment as the independent variable, we used a 20-yr data series of variables from 1962 to 1981 inclusive and reserved data for the years 1982–85 for a prediction test. Only hypotheses 1 and 5 were supported by both the response surface fit and prediction tests. The stock–recruitment curve can be fitted only when the transport curve is fitted simultaneously.

Interaction between Pacific Cod (Gadus macrocephalus) and Herring (Clupea harengus pallasi) in the Hecate Strait, British Columbia

1986 ◽  
Vol 43 (4) ◽  
pp. 830-837 ◽  
Author(s):  
Carl J. Walters ◽  
M. Stocker ◽  
A. V. Tyler ◽  
S. J. Westrheim
Keyword(s):  
British Columbia ◽  
Historical Data ◽  
Stomach Contents ◽  
Clupea Harengus ◽  
Regression Analyses ◽  
Pacific Cod ◽  
Predator Prey ◽  
Pacific Cod Gadus Macrocephalus ◽  
Clupea Harengus Pallasi ◽  
Gadus Macrocephalus

Pacific cod (Gadus macrocephalus) and herring (Clupea harengus pallasi) in the Hecate Strait have shown fluctuations consistent with the hypothesis that herring recruitment rates are strongly influenced by cod predation. Regression analyses of herring juvenile survival, as measured by log recruits per herring spawner, on Pacific cod abundance indicate that the cod may cause a total instantaneous mortality rate averaging around 0.75∙yr−1 with each cod consuming several hundred herring. Somewhat lower estimates of herring consumption per cod were expected on the basis of stomach contents data, but the discrepancy may well be due to systematic underestimates of cod abundance. Cod recruitment rates are positively correlated with herring abundance, but it is impossible to determine from historical data whether this correlation reflects predator–prey interdependence or the impacts of older cod on their own offspring, since cod and herring abundances are inversely correlated. Peak cod abundances in northern British Columbia during the late 1950's may be partly responsible for the collapse of the herring reduction fishery of the 1960's, and management of the two species should be coordinated to reflect the possibility of similar events in the future.

scholarly journals IgE reactivity to Pacific cod (Gadus macrocephalus) fish allergens in dogs with canine atopic dermatitis

2019 ◽  
Vol 143 (2) ◽  
pp. AB67
Author(s):  
Ichiro Imanishi ◽  
Jumpei Uchiyama ◽  
Takako Matsuda ◽  
Keijiro Mizukami ◽  
Hidekatsu Shimakura ◽  
...  
Keyword(s):  
Atopic Dermatitis ◽  
Pacific Cod ◽  
Canine Atopic Dermatitis ◽  
Ige Reactivity ◽  
Pacific Cod Gadus Macrocephalus ◽  
Gadus Macrocephalus

Temporal and ontogenetic shifts in habitat use of juvenile Pacific cod (Gadus macrocephalus)

2009 ◽  
Vol 377 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Benjamin J. Laurel ◽  
Clifford H. Ryer ◽  
Brian Knoth ◽  
Allan W. Stoner
Keyword(s):  
Habitat Use ◽  
Pacific Cod ◽  
Ontogenetic Shifts ◽  
Pacific Cod Gadus Macrocephalus ◽  
Gadus Macrocephalus

scholarly journals Functional Calcium Binding Peptides from Pacific Cod (Gadus macrocephalus) Bone: Calcium Bioavailability Enhancing Activity and Anti-Osteoporosis Effects in the Ovariectomy-Induced Osteoporosis Rat Model

Nutrients ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1325 ◽  
Author(s):  
Kai Zhang ◽  
Bafang Li ◽  
Qianru Chen ◽  
Zhaohui Zhang ◽  
Xue Zhao ◽  
...  
Keyword(s):  
Serum Calcium ◽  
Rat Model ◽  
Calcium Binding ◽  
Calcium Absorption ◽  
Intestinal Calcium Absorption ◽  
Pacific Cod ◽  
Pacific Cod Gadus Macrocephalus ◽  
Calcium Bioavailability ◽  
Gadus Macrocephalus ◽  
Binding Peptides

Calcium binding peptides from Pacific cod (Gadus macrocephalus) bone have attracted attention due to their potential effects on bone health. In this study, calcium binding peptides (CBP) were prepared from Pacific cod bone by trypsin and neutral protease. Ultraviolet spectra, circular dichroism (CD), and Fourier transform infrared spectroscopy (FTIR) revealed that carboxyl and amino groups in CBP could bind to Ca2+, and form the peptide-calcium complex (CBP-Ca). Single-pass intestinal perfusion (SPIP) experiments indicated that the intestinal calcium absorption was significantly enhanced (p < 0.01) in CBP-Ca treated Wistar rats. The anti-osteoporosis activity of CBP-Ca was investigated in the ovariectomized (OVX) Wistar rat model. The administration of CBP-Ca significantly (p < 0.01) improved the calcium bioavailability, trabecular bone structure, bone biomechanical properties, bone mineral density, and bone mineralization degree. CBP-Ca notably (p < 0.01) increased serum calcium, however, it remarkably (p < 0.01) reduced the levels of osteocalcin (OCN), bone alkaline phosphatase (BALP), tartrate-resistant acid phosphatase isoform 5b (TRAP5b), and C-telopeptide of type I collagen (CTX-1) in serum. Results suggested that the cod bone derived CBP could bind with calcium, improve the intestinal calcium absorption, calcium bioavailability, and serum calcium, then reduce the bone turnover rate, and thus ameliorate osteoporosis.

scholarly journals Prey-predator interactions of Pacific cod Gadus macrocephalus and water temperature.

1988 ◽  
Vol 54 (12) ◽  
pp. 2085-2088 ◽  
Author(s):  
Kohei Kihara ◽  
Allen M. Shimada
Keyword(s):  
Water Temperature ◽  
Pacific Cod ◽  
Pacific Cod Gadus Macrocephalus ◽  
Gadus Macrocephalus ◽  
Predator Interactions

Genetic isolation by distance and localized fjord population structure in Pacific cod (Gadus macrocephalus): limited effective dispersal in the northeastern Pacific Ocean

2009 ◽  
Vol 66 (1) ◽  
pp. 153-166 ◽  
Author(s):  
Kathryn Maja Cunningham ◽  
Michael Francis Canino ◽  
Ingrid Brigette Spies ◽  
Lorenz Hauser
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
Isolation By Distance ◽  
Spatial Scales ◽  
Puget Sound ◽  
Pacific Cod ◽  
Genetic Population ◽  
Pacific Cod Gadus Macrocephalus ◽  
Gadus Macrocephalus ◽  
Northeastern Pacific

Genetic population structure of Pacific cod, Gadus macrocephalus , was examined across much of its northeastern Pacific range by screening variation at 11 microsatellite DNA loci. Estimates of FST (0.005 ± 0.002) and RST (0.010 ± 0.003) over all samples suggested that effective dispersal is limited among populations. Genetic divergence was highly correlated with geographic distance in an isolation-by-distance (IBD) pattern along the entire coastal continuum in the northeastern Pacific Ocean (~4000 km; r2 = 0.83), extending from Washington State to the Aleutian Islands, and over smaller geographic distances for three locations in Alaska (~1700 km; r2 = 0.56). Slopes of IBD regressions suggested average dispersal distance between birth and reproduction of less than 30 km. Exceptions to this pattern were found in samples taken from fjord environments in the Georgia Basin (the Strait of Georgia (Canada) and Puget Sound (USA)), where populations were differentiated from coastal cod. Our results showed population structure at spatial scales relevant to fisheries management, both caused by limited dispersal along the coast and by sharp barriers to migration isolating smaller stocks in coastal fjord environments.

Loss of spawning habitat and prerecruits of Pacific cod during a Gulf of Alaska heatwave

2020 ◽  
Vol 77 (4) ◽  
pp. 644-650 ◽  
Author(s):  
Benjamin J. Laurel ◽  
Lauren A. Rogers
Keyword(s):  
Time Series ◽  
Laboratory Data ◽  
Reproductive Potential ◽  
Gulf Of Alaska ◽  
Spawning Habitat ◽  
Pacific Cod ◽  
Pacific Cod Gadus Macrocephalus ◽  
Gadus Macrocephalus ◽  
Hatch Success ◽  
Negative Impacts

Pacific cod (Gadus macrocephalus) stocks in the Gulf of Alaska experienced steep, unexpected declines following an unprecedented 3-year marine heatwave (i.e., “warm blob”) from 2014 to 2016. We contend that stock reproductive potential was reduced during this period, evidenced by a combination of new laboratory data demonstrating narrow thermal hatch success (3–6 °C), mechanistic-based models of spawning habitat, and correlations with prerecruit time series. With the exception of single-year El Niño events (1998, 2003), the recent 3-year heatwave (2014–2016) and return to similar conditions in 2019 were potentially the most negative impacts on spawning habitat for Pacific cod in the available time series (1994–2019). Continued warming will likely reduce the duration and spatial extent of Pacific cod spawning in the Gulf of Alaska.

Sign in / Sign up

Export Citation Format

Share Document