Cyprinid passage performance in an experimental multislot fishway across distinct seasons
Filipe Romão
A C , Ana L. Quaresma A , José M. Santos B , Paulo Branco B and António N. Pinheiro A
+ Author Affiliations
- Author Affiliations
A Civil Engineering for Research and Innovation for Sustainability, Instituto Superior Técnico, University of Lisbon, Avenida Rovisco Pais, PT-1049-001, Lisbon, Portugal.
B Forest Research Centre, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda, PT-1349-017, Lisbon, Portugal.
C Corresponding author. Email: filipe.romao@tecnico.ulisboa.pt
Marine and Freshwater Research 70(6) 881-890 https://doi.org/10.1071/MF18232
Submitted: 28 February 2018 Accepted: 26 November 2018 Published: 7 February 2019
Abstract
New engineering solutions are required to minimise the effects of an increasing number of anthropogenic barriers on watercourses. Longitudinal connectivity must be provided through fishways to allow free passage for the whole fish community. Recently, a multislot fishway (MSF) was developed, with two consecutive vertical slots that divide the overall head drop by two, thus reducing the flow velocity, the magnitude of turbulence and operational discharge compared with a standard vertical slot fishway (VSF) with similar pool and slot dimensions. The present study assessed the effectiveness of a MSF design for two cyprinid species with different ecological traits, under laboratory conditions, namely the Iberian barbel (Luciobarbus bocagei), a large-bodied potamodromous benthic fish, and the southern Iberian chub (Squalius pyrenaicus), a small-bodied water column fish. Experiments were conducted in a full-scale experimental fishway, in spring and autumn. Results showed differences in passage performance between seasons and species. During spring, chub had a higher entry efficiency and shorter transit time to fully negotiate the fishway, whereas no seasonal differences were found for the barbel. Overall, the MSF could be considered a cost-effective design for cyprinids with different ecological traits because it offers lower operational costs than a standard VSF. However, concerns about the entrance and attraction conditions should be addressed. In addition, because of the lower operational discharge, the propensity for obstruction with woody debris and sediments should not be disregarded.
Additional keywords: discharge, effectiveness, transit time, turbulence velocity, vertical slot fishway.
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