Results 211 to 220 of about 27,994 (237)

Spatial surplus production modeling of Atlantic tunas and billfish

Ecological Applications, 2011
We formulate and simulation-test a spatial surplus production model that provides a basis with which to undertake multispecies, multi-area, stock assessment. Movement between areas is parameterized using a simple gravity model that includes a "residency" parameter that determines the degree of stock mixing among areas.
Thomas R, Carruthers, Murdoch K, McAllister, Nathan G, Taylor   +2 more
openaire   +2 more sources

Incorporating accessibility limitation into the surplus production model

Fisheries Science, 2017
Limited access to aquatic populations hinders estimation of their status and establishment of effective management measures. We propose a modified surplus production model to cope with this problem. The model provides population parameters and biological reference points from a time series of annual accessible abundance data.
Shin-Ichiro Nakayama, Seiji Akimoto, Momoko Ichinokawa, Hiroshi Okamura   +3 more
openaire   +1 more source

Effects of underestimating catch and effort on surplus production models

Fisheries Research, 2016
Abstract Fisheries can be managed based on surplus production models when only catch and effort data are available. However, reported catch and effort may not equal the true values. We studied the effects of jointly underestimated catch and effort on surplus production model parameter estimates (e.g., MSY, B msy and F msy ) as well as estimates of ...
Kristen L. Omori, John M. Hoenig, Mark A. Luehring, Kathy Baier-Lockhart   +3 more
openaire   +1 more source

Application of the moving averaging technique in surplus production models

Journal of Ocean University of China, 2014
Surplus production models are the simplest analytical methods effective for fish stock assessment and fisheries management. In this paper, eight surplus production estimators (three estimation procedures) were tested on Schaefer and Fox type simulated data in three simulated fisheries (declining, well-managed, and restoring fisheries) at two white ...
Yu Wang, Qun Liu
openaire   +1 more source

Bayesian and Related Approaches to Fitting Surplus Production Models

Canadian Journal of Fisheries and Aquatic Sciences, 1994
The Schaefer surplus production model relates equilibrium yield to fishing effort and can be fitted using just information on catch and fishing effort. Sometimes, the fitted model predicts a maximum sustainable yield (height of the parabola) that is clearly unrealistic.
John M. Hoenig, William G. Warren, Max Stocker   +2 more
openaire   +1 more source

A Surplus Production Model with a Nonlinear Catch-Effort Relationship

Marine Resource Economics, 1998
Surplus production models have been used in fisheries analysis for over 40 years. The traditional surplus production model incorporates the assumption that catch per unit of effort is constant for a given stock size. As a result, effort can be indefinitely applied to the fishery in the short term, and catch would indefinitely increase at a constant ...
GIANLUIGI COPPOLA, SEAN PASCOE
openaire   +1 more source

Product line selection and pricing under a share-of-surplus choice model

European Journal of Operational Research, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ursula G. Kraus, Candace A. Yano
openaire   +2 more sources

Fitting Surplus Production Models: Comparing Methods and Measuring Uncertainty

Canadian Journal of Fisheries and Aquatic Sciences, 1993
Three approaches are commonly used to fit surplus production models to observed data: effort-averaging methods; process-error estimators; and observation-error estimators. We compare these approaches using real and simulated data sets, and conclude that they yield substantially different interpretations of productivity. Effort-averaging methods assume
Tom Polacheck, Ray Hilborn, Andre E. Punt   +2 more
openaire   +1 more source

Evaluation of logistic surplus production model through simulations

Fisheries Research, 2013
Abstract A simulation study was conducted to evaluate the reliability of estimates of maximum sustainable yield ( MSY ), the biomass at which the MSY is obtained ( B msy ), the exploitation rate required to achieve the MSY ( E msy ), and the intrinsic population growth rate ( r ), from a logistic production model fitted to catch and catch ...
openaire   +1 more source

An ecosystem-based hypothesis for climatic effects on surplus production in California sardine (Sardinops sagax) and environmentally dependent surplus production models

Canadian Journal of Fisheries and Aquatic Sciences, 2005
We used environmentally dependent surplus production (EDSP) models to test hypotheses linking changes in habitat area, carrying capacity and surplus production in California sardine (Sardinops sagax). Habitat area (with mean sea surface temperatures of 14–16 °C) was centered off Oregon, Washington, and British Columbia during July–December and off ...
Larry D Jacobson, Steven J Bograd, Richard H Parrish, Roy Mendelssohn, Franklin B Schwing   +4 more
openaire   +1 more source