—We assessed the relative importance of various factors contributing to spawning site use by a population of threatened coho salmon Oncorhynchus kisutch in Freshwater Creek, California, and created a predictive model of spawning habitat selection based on logistic regression analysis. We excluded sampling sites that previous studies had established as unsuitable on the basis of depth and substr...

Several recent technological and generational changes have led to the need for improved approaches to riverine habitat modeling and more comprehensive environmental flow assessments. The Instream Flow Incremental Methodology (IFIM) described an impact assessment framework but did not create the comprehensive software which would allow for a complete implementation of that framework. SEFA, Syste...

The basic premise underlying ecohydraulics is deceptively simple: create a new discipline focused on the effects of water movement in aquatic ecosystems by melding principles of aquatic ecology (including aspects of fluvial geomorphology) and engineering hydraulics. However, advancing ecohydraulics as a synthetic, organized field of study is challenging because hydraulic engineers and ecologist...

The following Arena papers in this issue of River Research and Applications present the first of two sets of papers that address the current development status of Mesohabitat Simulation system (MesoHABSIM) and Target Fish Community approach. It includes a description of the methodology, results of testing and validation and example of application. I am excited to deliver this publication into t...

Assessing fish habitat suitability in a data-scarce tidal river is often challenging due to the absence of continuous water quantity and quality records. This study comprised an intensive field on 42 km reach which recorded bathymetry physical parameters (pH, electroconductivity, dissolved oxygen, total solids) testing corresponding levels velocity. Frequent sampling was carried out 17 90 locat...

An appropriate environmental flow (AEF) is one of the necessary conditions for fish spawning. The operation cascade reservoirs in lower reaches Jinsha River has changed discharge process downstream, which turn directly affected spawning habitat fishes. Determining how to quantitatively evaluate impact different outflows from Xiangjiaba Reservoir on four major Chinese carp species downstream are...