Abstract Aim In the present study, structure of benthic invertebrates in ponds presence and absence Nile tilapia was evaluated. Methods The macroinvertebrates physicochemical parameters were analyzed for a period eight weeks, every 15 days, two (one with fish other without fish). Benthic sampled artificial substrate samplers, made cheap common materials, like expanded clay, loofah leaves gravel...

Five widely used metrics of bioaccumulation in fish are defined and discussed, namely the octanol-water partition coefficient (KOW ), bioconcentration factor (BCF), bioaccumulation factor (BAF), biomagnification factor (BMF), and trophic magnification factor (TMF). Algebraic relationships between these metrics are developed and discussed using conventional expressions for chemical uptake from w...

Abstract Background Altered hydrology is a stressor on aquatic life, but quantitative relations between specific aspects of streamflow alteration and biological responses have not been developed statewide scale in Minnesota. Best subsets regression analysis was used to develop linear models that quantify among five categories hydrologic metrics (i.e., duration, frequency, magnitude, rate-of-cha...

Introduction Development of indicators of " ecosystem health " for Great Lakes coastal wetlands was recognized as a major need at the State-of-the-Lakes Ecosystem Conferences (SOLEC) held in Buffalo, New York in 1998 and Hamilton, Ontario in 2000. Indicators listed by the wetlands indicators task force at these conferences included indices of biotic integrity (IBI) based on macroinvertebrates, ...

As a subset of environmental monitoring, fish sampling programs have been an important part of assessing the potential impacts of water withdrawals and effluent discharges on fish populations for many years. New environmental regulations often require that adverse environmental impacts to fish populations be minimized. Without long-term field data, population evaluations may incorrectly indicat...

BACKGROUND Fish is an important source of nutrition worldwide. Fish contain both the neurotoxin methyl mercury (MeHg) and nutrients important for brain development. The developing brain appears to be most sensitive to MeHg toxicity and mothers who consume fish during pregnancy expose their fetus prenatally. Although brain development is most dramatic during fetal life, it continues for years po...