Louis Addo, (Ph.D. Student in Biology)

Louis Addo (a Ph.D. student in Biology at Karlstad University) will be giving a talk about the interaction of salmonids fry with changing flows. The talk will be a presentation of a recently published article entitled “Growth and mortality of sympatric Atlantic salmon and brown trout fry in fluctuating and stable flows” by Louis and others from the River Ecology and Management Research group working with salmonids ecology and IBM’s.

You are invited to join this seminar live on zoom and at the biology department at Karlstad University (5F416) at 13:15 CET on 6th December 2022. To join in via zoom use the link: https://kau-se.zoom.us/my/kaubiology

Louis Addo (Ph.D. Student at Karlstad University)

Louis Addo (Doctoral Student), Mahboobeh Hajiesmaeli (Post-doctoral Researcher), John Piccolo (Professor) and John Watz (Associate Professor in Biology) all from the River Ecology and Management Research Group RivEM, Department of Environmental and Life Sciences at Karlstad University have recently published a paper entitled “Growth and mortality of sympatric Atlantic salmon and brown trout fry in fluctuating and stable flows” with the journal Ecology of Freshwater Fish.

In their paper, they explore the potential effects of hydropeaking or short-term regulated rivers on the growth and mortality of sympatric Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) at the fry life stage.

This paper is open-access and can be found at https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12685

Post Doctoral Researcher Mahboobeh Hajiesmaeili and others from Karlstad University’s biology department and the River Ecology and Management (RivEM) group have recently published an article (open access) entitled Individual-based modelling of hydropeaking effects on brown trout and Atlantic salmon in a regulated river where they parameterized and used inSTREAM version 7.2-SD (an individual based model with the capability of considering important fish ecological behavior) as a soft river management tool to analyze the effect of hydropeaking on juvenile fish in Lilla Åråsforsen (located downstream of the Gullspång dam along the Gullspång River in Sweden). Different scenarios of flows with and without hydropeaking were tested to access the impact of hydropeaking on growth, survival and distribution of age 0+ to 1+ juvenile brown trout (Salmo trutta) and Atlantic salmon (Salmo salar). Perhaps the most interesting finding was that hydropeaking had a modest negative effect on the survival and growth of both species but survival was more negatively affected than growth, especially in smaller juveniles. Most importantly, the study has demonstrated the potential use of IBMs for testing different research questions and assessing and prioritizing alternative management strategies in regulated rivers.

The paper is open access and can be found at https://onlinelibrary.wiley.com/doi/full/10.1002/rra.4037