<abstract xmlns="http://www.w3.org/1999/xhtml">Fisheries simulation models are tools used for forecasting the effects of exploitation and determining the directions of managing fisheries resources. The Numerical Model of Fish Exploitation (NMFE) and its capabilities were tested on a population of common bream, <italic>Abramis brama</italic> (L.) in a dam reservoir that is exploited by commercial and recreational fisheries. Based on the designated population parameters of <italic>N0</italic>, <italic>Fij</italic>, <italic>Mi</italic>, and <italic>ei</italic> and the size and structure of the common bream population in the reservoir, the model was used to examine hypothetical simulation variants of changes in fishing intensity <italic>E1</italic> with nets and rods, changes in fishing intensity based on actual fishing effort with nets, changes in natural mortality, changes in the size of fish caught, and the impact of this on the size of the resources. Initial catches with nets and rods were calculated. Increasing fishing effort did not translate proportionally to increased catches, and the function was curvilinear. The results of simulations that reduced the intensity of fishing with nets and decreased catch sizes concurred with data from actual catches. Simulations of changes in natural mortality had various effects on the size of catches. Reducing parameter <italic>M</italic> did not impact the level of catches, while increasing parameter <italic>M</italic> reduced the size of catches significantly.</abstract>

Fisheries simulation models are tools used for forecasting the effects of exploitation and determining the directions of managing fisheries resources. The Numerical Model of Fish Exploitation (NMFE) and its capabilities were tested on a population of common bream, Abramis brama (L.) in a dam reservoir that is exploited by commercial and recreational fisheries. Based on the designated population parameters of N0, Fij, Mi, and ei and the size and structure of the common bream population in the reservoir, the model was used to examine hypothetical simulation variants of changes in fishing intensity E1 with nets and rods, changes in fishing intensity based on actual fishing effort with nets, changes in natural mortality, changes in the size of fish caught, and the impact of this on the size of the resources. Initial catches with nets and rods were calculated. Increasing fishing effort did not translate proportionally to increased catches, and the function was curvilinear. The results of simulations that reduced the intensity of fishing with nets and decreased catch sizes concurred with data from actual catches. Simulations of changes in natural mortality had various effects on the size of catches. Reducing parameter M did not impact the level of catches, while increasing parameter M reduced the size of catches significantly.

Numerical Model of Fish Exploitation – structure and application

Inland Fisheries Institute in Olsztyn, Department of River Fisheries

Fisheries & Aquatic Life

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Numerical Model of Fish Exploitation \u2013 structure and application"}

Fisheries simulation models are tools used for forecasting the effects of exploitation and determining the directions of managing fisheries resources. The...

Numerical Model of Fish Exploitation – structure and application

Published Online: Aug 21, 2019

Page range: 86 - 101

Received: Mar 15, 2019

Accepted: Jun 15, 2019

DOI: https://doi.org/10.2478/aopf-2019-0010

Keywords
common bream, simulation model, catches, nets and rods, natural and fishing mortality

© 2019 Paweł Buras et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Numerical Model of Fish Exploitation – structure and application

Published Online: Aug 21, 2019

Page range: 86 - 101

Received: Mar 15, 2019

Accepted: Jun 15, 2019

DOI: https://doi.org/10.2478/aopf-2019-0010

Keywordscommon bream, simulation model, catches, nets and rods, natural and fishing mortality

© 2019 Paweł Buras et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
common bream, simulation model, catches, nets and rods, natural and fishing mortality