Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5933
Título: Monitoring fish passes using infrared beaming: a case study in an Iberian river
Autor: Santos, J.M.
Pinheiro, P.J.
Ferreira, M.T.
Bochechas, J.
Palavras-chave: fish pass
infrared beaming
Data: 2008
Editora: Blackwell
Citação: "Journal of Applied Ichthyology". ISSN 0175-8659 24 (2008) 26-30
Resumo: An application of a new automated fish counting device – the Riverwatcher System (RW) – was used to monitor upstream fish movements in a pool-and-weir fish pass in the River Zeˆ zere, Portugal, for 141 days from June 2002 to May 2003. Fish populations were also collected downstream using multimesh gillnets (5 different mesh sizes ranging from 30 mm to 85 mm knot to knot; ratio between mesh sizes of about 1.30) and electrofishing for comparison with fish records produced by the RW. More than 3000 individual Iberian nase Chondrostoma polylepis ascended the fish pass and moved through the RW during the study period. However, only 18% of the records produced by the RW contained silhouettes similar to fish; no individual smaller than 15 cm TL was recorded by the counter. Most seasonal movements (73.9%) occurred in spring and were associated with reproduction. Displacements seemed to occur independently of time of day. Water temperature (range: 12–22 C) was the only significant environmental variable (P < 0.01) influencing upstream movements of this species. Further development of hardware and software will be necessary to improve performance of the counter, particularly in Mediterranean rivers, where more turbid waters and a greater proportion of small-size species are present
Peer review: yes
URI: http://hdl.handle.net/10400.5/5933
ISSN: 0175-8659
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