Premium
A Comparison of Seining and Electrofishing for Fish Community Bioassessment in a Mexican Atlantic Slope Montane River
Author(s) -
MercadoSilva Norman,
EscandónSandoval David S.
Publication year - 2008
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/m08-009.1
Subject(s) - electrofishing , species richness , index of biological integrity , fishery , ecology , sampling (signal processing) , benthic zone , geography , environmental science , fish <actinopterygii> , biology , filter (signal processing) , computer science , computer vision
Tropical freshwater fish monitoring and conservation strategies depend on data from surveys made with a variety of sampling methodologies. These methodologies have inherent biases that can lead to different data interpretations. We compared two commonly used sampling techniques—seining and electrofishing—in the calculation of community parameters and ecosystem bioassessment in a montane river in the Gulf of Mexico drainage in the state of Veracruz, Mexico. We specifically evaluated whether seining was sufficient for fish community assessment. Electrofishing produced higher estimates of species richness (45%), diversity (∼30%), and biomass (∼80%) than seining. It also produced higher biotic integrity scores. Species' relative abundance was generally similar for species captured with both techniques, but seines failed at capturing fast‐swimming and benthic species. Thus, seining alone offered an incomplete perspective on the fish community and may not be adequate for bioassessment. Our results and methodology can help in the design of future survey efforts and the creation of correction factors that can aid managers to better sample biological communities and apply adequate conservation strategies.