1
|
Dahlmo LS, Velle G, Nilsen CI, Pulg U, Lennox RJ, Vollset KW. Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system. MOVEMENT ECOLOGY 2023; 11:63. [PMID: 37838718 PMCID: PMC10576395 DOI: 10.1186/s40462-023-00429-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 10/03/2023] [Indexed: 10/16/2023]
Abstract
Many Norwegian rivers and lakes are regulated for hydropower, which affects freshwater ecosystems and anadromous fish species, such as sea trout (Salmo trutta). Lakes are an important feature of many anadromous river systems. However, there is limited knowledge on the importance of lakes as habitat for sea trout and how hydropower affects the behaviour of sea trout in lakes. To investigate this, we conducted an acoustic telemetry study. A total of 31 adult sea trout (532 ± 93 mm total length) were captured by angling in river Aurlandselva, Norway, and tagged between July 20 and August 12, 2021. The tags were instrumented with accelerometer, temperature, and depth sensors, which provided information on the sea trout's presence and behaviour in lake Vassbygdevatnet. Our results indicate that there was a large prevalence of sea trout in the lake during the spawning migration, and that the sea trout were less active in the lake compared to the riverine habitats. An increase in activity of sea trout in the lake during autumn might indicate that sea trout spawn in the lake. However, the discharge from the high-head storage plant into the lake did not affect the depth use or activity of sea trout in the lake. Furthermore, the large prevalence of spawners in the lake during autumn will likely cause an underestimation of the size of the sea trout population in rivers with lakes during annual stock assessment. In conclusion, our results could not find evidence of a large impact of the discharge on the behaviour of sea trout in the lake.
Collapse
Affiliation(s)
- Lotte S Dahlmo
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway.
- Department of Biological Sciences, University of Bergen, Thormøhlens Gate 53A, 5008, Bergen, Norway.
| | - Gaute Velle
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway
- Department of Biological Sciences, University of Bergen, Thormøhlens Gate 53A, 5008, Bergen, Norway
| | - Cecilie I Nilsen
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway
- Department of Biological Sciences, University of Bergen, Thormøhlens Gate 53A, 5008, Bergen, Norway
| | - Ulrich Pulg
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway
| | - Robert J Lennox
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway
- NINA Norwegian Institute for Nature Research, Høgskoleringen 9, 7034, Trondheim, Norway
| | - Knut W Vollset
- LFI Laboratory for Freshwater Ecology and Inland Fisheries, NORCE Norwegian Research Centre, Nygårdsgaten 112, 5008, Bergen, Norway
| |
Collapse
|
2
|
Kennedy RJ, Campbell W, Gallagher K, Evans D. River lamprey present an unusual predation threat to Atlantic salmon smolts in Lough Neagh, Northern Ireland. JOURNAL OF FISH BIOLOGY 2020; 97:1265-1267. [PMID: 32725628 DOI: 10.1111/jfb.14477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/21/2020] [Accepted: 07/25/2020] [Indexed: 06/11/2023]
Abstract
A new monitoring programme on the Lough Neagh catchment has documented a high incidence of river lamprey, Lampetra fluviatilis L., predation on Atlantic salmon smolts, Salmo salar L. In total 470 smolts were examined during the 2020 emigration period with 168 fish (36%) exhibiting lamprey scars of which 57 were lightly scarred and 111 were classed as heavily scarred. Lamprey predation was not size selective on Lough Neagh S. salar smolts.
Collapse
Affiliation(s)
- Richard J Kennedy
- Agri-Food & Biosciences Institute, River Bush Salmon Station, Bushmills, UK
| | - Warren Campbell
- Department of Agriculture, Environment and Rural Affairs, Belfast, UK
| | | | - Derek Evans
- Agri-Food & Biosciences Institute, Belfast, UK
| |
Collapse
|
3
|
Kennedy RJ, Rosell R, Millane M, Doherty D, Allen M. Migration and survival of Atlantic salmon Salmo salar smolts in a large natural lake. JOURNAL OF FISH BIOLOGY 2018; 93:134-137. [PMID: 29882213 DOI: 10.1111/jfb.13676] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 04/22/2018] [Indexed: 05/25/2023]
Abstract
An investigation with acoustic telemetry of the passage of Salmo salar smolts through a large natural lake found heavy mortality occurred at the river-to-lake confluences (mean 31.2% km-1 ), but was lower in the main body of the lake (mean 2.4% km-1 ). Predation was a significant pressure on emigrating smolts as tagged pike Esox lucius aggregated at river-to-lake confluences during the peak of the smolt run. Tagged smolts mainly emmigrated into the lake in the late evening after dusk, possibly as a predator-avoidance behaviour.
Collapse
Affiliation(s)
| | - Robert Rosell
- Agri-Food and Biosciences Institute, Belfast, Northern Ireland
| | | | | | - Michelle Allen
- Agri-Food and Biosciences Institute, Belfast, Northern Ireland
| |
Collapse
|
4
|
Kennedy RJ, Allen M, Wilson R. Tag retention and mortality of adult Atlantic salmon Salmo salar gastrically tagged with different sized telemetry transmitters. JOURNAL OF FISH BIOLOGY 2018; 92:2016-2021. [PMID: 29577282 DOI: 10.1111/jfb.13622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 03/19/2018] [Indexed: 06/08/2023]
Abstract
A batch of 1 sea winter pre-spawning adult Salmo salar from the Bush river in Northern Ireland, U.K., were gastrically tagged with large (13 mm diameter) and small (9 mm diameter) dummy acoustic telemetry tags alongside untagged control fish. Survival differed between control and tagged fish and the estimated probability of survival by the end of the study for control fish with no tag was 0·94, small tags was 0·90 and large tags was 0·72. Tag loss through regurgitation was slightly higher for fish tagged with larger tags than for fish tagged with smaller tags and the estimated probability of tag loss for fish with a small tag was 0·10 and for large tags was 0·14.
Collapse
Affiliation(s)
- R J Kennedy
- Agri-Food and Biosciences Institute, Fisheries & Aquatic Ecosystems Branch, Newforge Lane, Belfast, BT9 5PX, U.K
| | - M Allen
- Agri-Food and Biosciences Institute, Fisheries & Aquatic Ecosystems Branch, Newforge Lane, Belfast, BT9 5PX, U.K
| | - R Wilson
- Agri-Food and Biosciences Institute, Fisheries & Aquatic Ecosystems Branch, Newforge Lane, Belfast, BT9 5PX, U.K
| |
Collapse
|