scholarly journals Modeling the Dynamics of Multispecies Fisheries: A Case Study in the Coastal Water of North Yellow Sea, China

2020 ◽  
Vol 7 ◽  
Author(s):  
Jia Wo ◽  
Chongliang Zhang ◽  
Xindong Pan ◽  
Binduo Xu ◽  
Ying Xue ◽  
...  
Keyword(s):  
Model Validation ◽  
Fisheries Management ◽  
Yellow Sea ◽  
Sensitivity Analyses ◽  
Size Spectrum ◽  
Quality Of Data ◽  
Estimation Model ◽  
North Yellow Sea ◽  
Multispecies Fisheries ◽  
Spectrum Model

Ecosystem models have been developed for detecting community responses to fishing pressure and have been widely applied to predict the ecological effects of fisheries management. Key challenges of ecosystem modeling lie in the insufficient quantity and quality of data, which is unfortunately common in the marine ecosystems of many developing countries. In this study, we aim to model the dynamics of multispecies fisheries under data-limited circumstances, using a multispecies size-spectrum model (MSSM) implemented in the coastal ecosystem of North Yellow Sea, China. To make most of available data, we incorporated a range of data-limited methods for estimating the life-history parameters and conducted model validation according to empirical data. Additionally, sensitivity analyses were conducted to evaluate the impacts of input parameters on model predictions regarding the uncertainty of data and estimating methods. Our results showed that MSSM could provide reasonable predictions of community size spectra and appropriately reflect the community composition in the studied area, whereas the predictions of fisheries yields were biased for certain species. Errors in recruitment parameters were most influential on the prediction of species abundance, and errors in fishing efforts substantially affected community-level indicators. This study built a framework to integrate parameter estimation, model validation, and sensitivity analyses altogether, which could guide model development in similar mixed and data-limited fisheries and promote the use of size-spectrum model for ecosystem-based fisheries management.

scholarly journals Assessing uncertainty of a multispecies size-spectrum model resulting from process and observation errors

2015 ◽  
Vol 72 (8) ◽  
pp. 2223-2233 ◽  
Author(s):  
Chongliang Zhang ◽  
Yong Chen ◽  
Yiping Ren
Keyword(s):  
Life History ◽  
Community Structure ◽  
Fisheries Management ◽  
Dynamic Models ◽  
Environmental Variability ◽  
Size Spectrum ◽  
Sampling Errors ◽  
Fishing Activity ◽  
Scale Parameters ◽  
Spectrum Model

AbstractEcosystem models, specifically multispecies dynamic models, have been increasingly used to project impacts of fishing activity on the trophodynamics of ecosystems to support ecosystem-based fisheries management. Uncertainty is unavoidable in modelling processes and needs to be recognized and properly quantified before models are utilized. Uncertainty was assessed in this study for a multispecies size-spectrum model that quantifies community structure and ecological characteristics. The uncertainty was assumed to result from errors in fish life-history and metabolic scale parameters, environmental variability, fishing variability, and sampling errors. Given the same level of imprecision, metabolic scale parameters had the dominant influence on the uncertainty of the size spectrum modelling results, followed by life-history parameters. Both types of errors led to “scenario uncertainty”, suggesting the possible existence of alternative states of community structure. Environmental variability, fishing variability, and observation errors resulted in “statistical uncertainty”, implying that such uncertainty can be described adequately in statistical terms. The results derived from such a simulation study can provide guidance for identifying research priorities to help narrow the gap in scientific knowledge and reduce the uncertainty in fisheries management.

RESERVOIR CHARACTERISTICS AND INFLUENTIAL FACTORS IN THE EASTERN DEPRESSION OF THE NORTH YELLOW SEA BASIN

2014 ◽  
Vol 33 (2) ◽  
pp. 111-120
Author(s):  
Jie LIANG ◽  
Zhenhe WEN ◽  
Guolin XIAO ◽  
Yinguo ZHANG ◽  
Heping DONG
Keyword(s):  
Yellow Sea ◽  
Influential Factors ◽  
North Yellow Sea ◽  
Reservoir Characteristics ◽  
The North

scholarly journals Balanced harvesting in fisheries: a preliminary analysis of management implications‡

2015 ◽  
Vol 73 (6) ◽  
pp. 1668-1678 ◽  
Author(s):  
S. M. Garcia ◽  
J. Rice ◽  
A. Charles
Keyword(s):  
Fisheries Management ◽  
Preliminary Analysis ◽  
Fishery Management ◽  
Sustainable Use ◽  
Relative Size ◽  
Implementation Challenges ◽  
Multispecies Fisheries ◽  
Natural Productivity ◽  
Partial Implementation ◽  
Spawning Sites

Abstract Balanced harvest (BH) proposes to distribute a moderate mortality from fishing across the widest possible range of species, stocks, and sizes in an ecosystem, in proportion to their natural productivity so that the relative size and species composition are maintained, in line with the CBD requirement for sustainable use. This proposal has many and not always intuitive implications for fisheries management, e.g. in relation to selectivity, protection of juveniles and spawning sites, models of harvesting strategies, a focus on size and species, the impacts of discarding, aspects of emblematic species and ecosystem services, operational complexity, partial implementation, ecosystem rebuilding, and relations with broader management frameworks. The paper closes with a discussion of BH implementation, concluding that a logical step would be to integrate several separate initiatives to move fisheries into a more ecosystem-conscious context. Implementation challenges will be encountered, but there are lessons to be drawn from fishery ecosystems already close to BH, as in some tropical multispecies fisheries, and further, the implementation challenges are already being taken on in many well-managed fisheries and areas as management begins to address the realities of what ecosystem-based fishery management actually entails.

Evolution of surface cold patches in the North Yellow Sea based on satellite SST data

2016 ◽  
Vol 15 (6) ◽  
pp. 936-946 ◽  
Author(s):  
Jingwen Hu ◽  
Maochong Shi ◽  
Tinglu Zhang ◽  
Shuguo Chen ◽  
Lunyu Wu
Keyword(s):  
Yellow Sea ◽  
North Yellow Sea ◽  
The North ◽  
Satellite Sst

Shifts in plankton size spectra modulate growth and coexistence of anchovy and sardine in upwelling systems

2016 ◽  
Vol 73 (4) ◽  
pp. 611-621 ◽  
Author(s):  
T. Mariella Canales ◽  
Richard Law ◽  
Julia L. Blanchard
Keyword(s):  
Size Structure ◽  
Prey Availability ◽  
Empirical Work ◽  
Size Composition ◽  
Size Spectrum ◽  
Small Particles ◽  
Size Spectra ◽  
Factors Influencing ◽  
Spectrum Model ◽  
Model Scenarios

Fluctuations in the abundance of anchovy (Engraulis spp.) and sardine (Sardinops sagax) are widespread in marine ecosystems, but the causes still remain uncertain. Differences between the planktonic prey availability, selectivity, and predation between anchovy and sardine have been suggested as factors influencing their dynamics. Using a dynamical multispecies size-spectrum model, we explore the consequences of changes in plankton size composition, together with intraguild predation and cannibalism, on the coexistence of these species. The shift towards smaller plankton has led to a reduction in the growth rate of both species. The effect was more deleterious on anchovy growth because it is unable to filter small particles. In model scenarios that included the effects of cannibalism and predation, anchovy typically collapsed under conditions favouring smaller sized plankton. The two species coexisted under conditions of larger sized plankton, although strong predation in conjunction with weak cannibalism led to the loss of sardine. The model provides new testable predictions for the consequences of plankton size structure on anchovy and sardine fluctuations. Further empirical work is needed to test these predictions in the context of climate change.

scholarly journals Bridging fisheries management and biodiversity conservation norms: potential and challenges of balancing harvest in ecosystem-based frameworks

2015 ◽  
Vol 73 (6) ◽  
pp. 1659-1667 ◽  
Author(s):  
S. M. Garcia ◽  
J. Rice ◽  
A. Charles
Keyword(s):  
Decision Making ◽  
Fisheries Management ◽  
Biological Diversity ◽  
Population Level ◽  
System Level ◽  
Convention On Biological Diversity ◽  
Management Decision ◽  
Size Spectrum ◽  
Ecosystem Structure ◽  
Management Decision Making

Abstract Balanced harvesting has been proposed as a way for fisheries management to achieve the requirements of both the Law of the Sea Convention (LOSC)—to maintain stocks at the level at which they could produce MSY—and the Convention on Biological Diversity (CBD)—to maintain ecosystem structure and functioning. This paper examines these requirements and briefly presents four system-level relationships (spectra), representing ecosystem structures that might guide management decision-making aiming to meet both requirements. These spectra would fit in the widely accepted frameworks of the Ecosystem Approach enshrined in the CBD and adopted by FAO for Fisheries. A size spectrum, relating biomass to body length, is used as an example to illustrate its potential to support management decision-making—much like present stock-based harvest control rules—in more ecosystem-compliant fishing strategies at a sector or ecosystem level, as a complement to those currently used at a stock/population level.

scholarly journals Superimposed versus residual basin: The North Yellow Sea Basin

2012 ◽  
Vol 3 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Wenyong Li ◽  
Wenfen Lu ◽  
Yanxu Liu ◽  
Jianchun Xu
Keyword(s):  
Yellow Sea ◽  
North Yellow Sea ◽  
The North
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