A Numerical Simulation Model of the Population Dynamics of Walleye Pollock, Theragra chalcogramma (Pallas 1811), in a Simplified Ecosystem : Part I, Model Description

Knechtel, Charles D.; Bledsoe, Lewis J.

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A Numerical Simulation Model of the Population Dynamics of Walleye Pollock, Theragra chalcogramma (Pallas 1811), in a Simplified Ecosystem : Part I, Model Description

1981
By Knechtel, Charles D. ; Bledsoe, Lewis J.
Series: NOAA Technical Memorandum NMFS F/NWC ; 19

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Personal Author:

Knechtel, Charles D. ; Bledsoe, Lewis J.

Knechtel, Charles D. ; Bledsoe, Lewis J. Less -
Corporate Authors:

Northwest and Alaska Fisheries Center (U.S.). Resource Assessment and Conservation Engineering Division
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) ; AFSC (Alaska Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) ; AFSC (Alaska Fisheries Science Center) Less -
Description:

This report is a description of an age-structured energetics and population model of walleye pollock, Theragra chalcogramma (Pallas 1811), in a simplified Bering Sea ecosystem consisting of phytoplankton, copepods, and euphausiids. The objective of the model is to study the theoretical effects of linkages among energy flow, recruitment, mortality (particularly due to cannibalism), and fecundity on the population dynamics and potential fishery yields of walleye pollock.

The model pollock populations are driven by primary production in the form of phytoplankton. The model is principally defined using ordinary differential equations in an age-structured array approximating the integro- differential equation formulation for population dynamics. Equations, parameter values and initial conditions are given with their bibliographic sources. The model includes processes of diet selection, consumption rate, assimilation, respiration, starvation mortality, predatory mortality (due to cannibalism), reproduction, and fishing mortality. A subsequent report will describe the dynamics of the model pollock populations and other emergent properties.
Keywords:

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Computer Simulation Fishery Management Fish Stock Assessment Walleye Pollock
Series:

NOAA Technical Memorandum NMFS F/NWC ; 19
Document Type:

Technical Memorandum
Place as Subject:

North Pacific Ocean ; Bering Sea ; United States

North Pacific Ocean ; Bering Sea ; United States Less -
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Public Domain
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urn:sha256:aa2e7b1f05d045a4344d13843f22278742017d2b90507e9726da0396c0789d89
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https://repository.library.noaa.gov/view/noaa/23308/noaa_23308_DS1.pdf
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A Numerical Simulation Model of the Population Dynamics of Walleye Pollock, Theragra chalcogramma (Pallas 1811), in a Simplified Ecosystem : Part I, Model Description

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