Growth and production of Pacific ocean perch (Sebastes alutus) in nursery habitats of the Gulf of Alaska

2012 ◽  
Vol 21 (6) ◽  
pp. 415-429 ◽  
Author(s):  
CHRISTOPHER N. ROOPER ◽  
JENNIFER L. BOLDT ◽  
SONIA BATTEN ◽  
CHRISTOPHER GBURSKI
Keyword(s):  
Pacific Ocean ◽  
Gulf Of Alaska ◽  
Nursery Habitats

scholarly journals Reproductive Biology of Pacific Ocean Perch in the Gulf of Alaska

2013 ◽  
Vol 5 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Christina L. Conrath ◽  
Brian Knoth
Keyword(s):  
Pacific Ocean ◽  
Reproductive Biology ◽  
Gulf Of Alaska

Biology of the Pacific Pomfret (Brama japonica) in the North Pacific Ocean

1993 ◽  
Vol 50 (12) ◽  
pp. 2608-2625 ◽  
Author(s):  
William G. Pearcy ◽  
Joseph P. Fisher ◽  
Mary M. Yoklavich
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Gulf Of Alaska ◽  
Small Fish ◽  
Large Fish ◽  
The North ◽  
The Pacific ◽  
Subarctic Current ◽  
The North Pacific

Abundances of Pacific pomfret (Brama japonica), an epipelagic fish of the North Pacific Ocean, were estimated from gillnet catches during the summers of 1978–1989. Two size modes were common: small pomfret <1 yr old, and large fish ages 1–6. Large and small fish moved northward as temperatures increased, but large fish migrated farther north, often into the cool, low-salinity waters of the Central Subarctic Pacific. Lengths of small fish were positively correlated with latitude and negatively correlated with summer surface temperature. Interannual variations in the latitude of catches correlated with surface temperatures. Large catches were made in the eastern Gulf of Alaska (51–55°N) but modes of small pomfret were absent here, and large fish were rare at these latitudes farther to the west. Pomfret grow rapidly during their first two years of life. They are pectoral fin swimmers that swim continuously. They prey largely on gonatid squids in the region of the Subarctic Current in the Gulf of Alaska during summer. No evidence was found for aggregations on a scale ≤1 km. Differences in the incidence of tapeworm, spawning seasons, and size distributions suggest the possibility of discrete populations in the North Pacific Ocean.

Biology and Management of Dogfish Sharks

2009 ◽  
Keyword(s):  
Stable Isotope ◽  
Pacific Ocean ◽  
Food Webs ◽  
Trophic Position ◽  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Gulf Of Alaska ◽  
The North ◽  
Northeastern Pacific ◽  
The Mean

Abstract.—Spiny dogfish <em>Squalus acanthias </em>biomass has increased in the Gulf of Alaska, yet little is known about the ecological niche that dogfish fill in this ecosystem. Trophic position is an important indicator of the ecological role of an organism. To explore the trophic position of dogfish we analyzed the nitrogen and carbon stable isotope ratios of 60 dogfish from five locations between Washington and the Gulf of Alaska. The mean δ<sup>15</sup>N values for dogfish ranged from 12.0‰ (central Gulf of Alaska) to 13.4‰ (Howe Sound, British Columbia) and the mean δ<sup>13</sup>C values ranged from –21.3‰ (Yakutat Bay, Alaska) to –17.9‰ (Puget Sound, Washington). Sites to the north tended to be significantly depleted in the heavy isotopes of both nitrogen and carbon. The differences in nitrogen isotope ratios among sites were attributed to potential changes in dogfish feeding behavior and trophic position. Differences in carbon isotope ratios suggested that dogfish utilize different food webs along the northeastern Pacific Ocean shelf. Additionally it was hypothesized that feeding differentially in offshore versus inshore food webs or targeting pelagic versus benthic prey species may explain the isotopic variability. These results are preliminary and require additional tests before conclusions can be made about the trophic position of dogfish in this region. Future work will explore stable isotope variability at lower trophic levels to test the hypothesis that entire food webs are isotopically shifted owing to differences in isotopic fractionation at the base of the food web. Also, trophic level differences among dogfish size classes and between sexes will be explored among a greater diversity of locations to better describe the ecological consequences of increased biomass of dogfish in the northeastern Pacific Ocean.

Genetic Variation and Population Structure of Pacific Ocean Perch (Sebastes alutus)

1988 ◽  
Vol 45 (1) ◽  
pp. 78-88 ◽  
Author(s):  
Lisa Wishard Seeb ◽  
Donald R. Gunderson
Keyword(s):  
Pacific Ocean ◽  
Bering Sea ◽  
Gulf Of Alaska ◽  
Allozyme Data ◽  
Gene Frequencies ◽  
Significant Frequency ◽  
Commercially Important ◽  
Slight Amount ◽  
Selective Regime ◽  
The Bering Sea

We conducted an allozyme analysis of 27 collections representing over 1500 individuals of Pacific ocean perch (Sebastes alutus). Data were gathered from 25 presumptive loci of which 20% were polymorphic. Average observed heterozygosity was 0.069. Samples originated from throughout the commercially important range of the species from the Washington coast to the Bering Sea. Pacific ocean perch are highly similar throughout the range, with only a slight amount of population differentiation (FST = 0.023). However, a cline of gene frequencies within the Gulf of Alaska exists at Ada2, and there are significant frequency differences between the extremes of the range for several additional loci. There is no evidence of an interruption of gene flow between the western Gulf of Alaska and the Bering Sea. Stock delineations based on age structure, age–length relationships, and ages at maturity were not supported by the allozyme data and are either influenced by nongenetic environmental factors or are under a selective regime not measured by allozyme analyses.

Generalized Stock Reduction Analysis

1984 ◽  
Vol 41 (9) ◽  
pp. 1325-1333 ◽  
Author(s):  
Daniel K. Kimura ◽  
James W. Balsiger ◽  
Daniel H. Ito
Keyword(s):  
Pacific Ocean ◽  
Difference Equation ◽  
Yield Curve ◽  
Gulf Of Alaska ◽  
Sustainable Yield ◽  
Delay Difference Equation ◽  
Exogenous Variables ◽  
Stock Recruitment ◽  
Variable Recruitment ◽  
Delay Difference

In this paper we generalize Stock Reduction Analysis (SRA) so that the model now allows for growth in the fishable biomass, and variable recruitment to the fishable biomass. The application of R. B. Deriso's delay-difference equation to SRA allows for growth, and also provides justification for using a biomass based model. Variable recruitment is introduced into SRA using both a stock–recruitment relationship and exogenous variables. We present general methods for obtaining unique solutions to the SRA equations, and give a new method for calculating the equilibrium sustainable yield curve. By applying the generalized SRA model to Pacific ocean perch (Sebastes alutus) stocks in the Gulf of Alaska, we conclude that the sustainable yield from this stock is smaller than previously estimated.

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