Eurasian perch Perca fluviatilis growth and fish community structure,inside and outside a marine‐protected area in the Baltic Sea |
| |
Authors: | T R Nelson A E Jefferson P T Cooper C A Buckley K L Heck Jr J Mattila |
| |
Institution: | 1. Department of Marine Sciences, University of South Alabama, Mobile, Alabama;2. Dauphin Island Sea Lab, Dauphin Island, Alabama;3. Department of Aquatic Resources, Swedish University of Agricultural Science, ?regrund, Sweden |
| |
Abstract: | Growth of Eurasian perch Perca fluviatilis L. and fish community structure between sites within a marine‐protected area (MPA) and unprotected sites in the Baltic Sea were examined. Von Bertalanffy, logistic and Gompertz growth models were fitted to P. fluviatilis length at age data, and the logistic model was the most parsimonious for growth between locations. A larger mean maximum size (L∞) and a smaller instantaneous growth rate (g) were found within the MPA. All three models also predicted that after age seven, fish inside the MPA would be larger. Community structure differed with more P. fluviatilis collected outside of the MPA, and more roach Rutilus rutilus (L.) and bleak Alburnus alburnus (L.) collected inside the MPA. These growth differences may be indicative of recreational fishing effects on P. fluviatilis outside of the MPA, a result of complex interspecific and intraspecific species interactions, or other undetected environmental variation between locations. |
| |
Keywords: | age Gompertz logistic marine protected areas recreational fishing von Bertalanffy |
|
|