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Behaviour of sea lamprey (Petromyzon marinus L.) at man-made obstacles during upriver spawning migration: use of telemetry to assess efficacy of weir modifications for improved passage
Seán M. Rooney, Glen Wightman, Ruairi Ó'Conchúir and James J. King
Biology and Environment: Proceedings of the Royal Irish Academy
Vol. 115B, No. 2 (2015), pp. 125-136
Published by: Royal Irish Academy
Stable URL: http://www.jstor.org/stable/10.3318/bioe.2015.14
Page Count: 12
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ABSTRACT Artificial weirs on the Mulkear River present an obstacle to sea lamprey (Petromyzon marinus L.) during upstream spawning migration. Telemetry to monitor passage success was undertaken in 2010 and repeated in 2011 following modifications to two of the weirs in the lower section of the river. Upstream migrants, captured downstream of the first weir, were radio tagged during 2010 (n = 51) and 2011 (n = 36). During both years tagged fish were experimentally re-released in two batches downstream (n = 20 both years) and upstream (n = 31 for 2010; n = 16 for 2011) of this structure, respectively. Subsequent telemetry conducted over nine weeks in 2010 suggested the majority of sea lamprey movements were downstream, with only one tagged fish ascending any of the weirs. Some fish spawned downstream of the first weir while other fish descended further to known spawning sites on the River Shannon both up and downstream of the Mulkear confluence. During 2011, localised movements were recorded up to but not across the first weir for the downstream-released fish. Of the 16 fish released upstream, three (19%) ascended the modified third weir and progressed further into the catchment compared with 0% (0/31) the previous year.
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