Mikko Olin
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View article: Troubled by the humics — effects of water colour and interspecific competition on the feeding efficiency of planktivorous perch
Troubled by the humics — effects of water colour and interspecific competition on the feeding efficiency of planktivorous perch Open
In humic lakes in addition to various density-dependent interactions, dark water may be partly causing a bottleneck in perch (Perca fluviatilis) growth. This study focuses on clarifying the role of water colour and increasing fish density …
View article: The capability of harvestable slot-length limit regulation in conserving large and old northern pike (Esox lucius)
The capability of harvestable slot-length limit regulation in conserving large and old northern pike (Esox lucius) Open
In this experimental fisheries regulation study, we compared the effects of size-selective fishing according to minimum length limit (MLL, 40 cm) or harvestable slot-length limit (HSL, 40–64.9 cm) on population density, biomass, size and a…
View article: Model-based evaluation of the management of pikeperch (Sander lucioperca) stocks using minimum and maximum size limits
Model-based evaluation of the management of pikeperch (Sander lucioperca) stocks using minimum and maximum size limits Open
Pikeperch populations typically differ substantially in life-history traits. Here, we evaluated the potential of variable size limits to ensure ecologically and evolutionarily sustainable fishing of six important Finnish inland pikeperch s…
View article: Zooplankton rhapsody: Unexpected response in community following increased fish predation
Zooplankton rhapsody: Unexpected response in community following increased fish predation Open
The impact of increased fish density on the crustacean zooplankton was studied in a small, forest lake. Interestingly and contrary to our hypothesis, increased fish density resulted in an increase in biomass of large-sized cladocerans, but…
View article: Effects of non-selective and size-selective fishing on perch populations in a small lake
Effects of non-selective and size-selective fishing on perch populations in a small lake Open
Retaining large individuals is considered intrinsic to sustainable fishing. In this nine-year study, we explored the effects of simulated recreational fishing on life-history traits of two perch (Perca fluviatilis) populations in a lake di…
View article: Responses of zooplankton to long-term environmental changes in a small boreal lake
Responses of zooplankton to long-term environmental changes in a small boreal lake Open
Zooplankton dynamics were examined in a small boreal lake over a 20-year period and interpreted in relation to climate change, brownification and recovery from acidification. Significant changes were recorded in the abundance of dominating…
View article: Recovery of acidified lakes in Finland and subsequent responses of perch and roach populations
Recovery of acidified lakes in Finland and subsequent responses of perch and roach populations Open
Finnish-lake and fish-status surveys indicated that 4900 small headwater lakes suffered from acidic deposition and 1600–3200 roach (Rutilus rutilus) and perch (Perca fluviatilis) populations were affected or extinct by the end of 1980s. Si…
View article: Preface to the Special Issue “Ecologically sustainable fishing”: Project KESKALA background, objectives and conclusions
Preface to the Special Issue “Ecologically sustainable fishing”: Project KESKALA background, objectives and conclusions Open
(No abstract)
View article: Roach (Rutilus rutilus) populations respond to varying environment by altering size structure and growth rate
Roach (Rutilus rutilus) populations respond to varying environment by altering size structure and growth rate Open
To better understand the environmental factors and biological interactions affecting roach abundance and population structure in oligo-mesotrophic lakes, we explored roach population parameters in 24 small forest lakes in southern Finland.…
View article: Littoral resources, food chain length and top predator size - Are these connected with lake size?
Littoral resources, food chain length and top predator size - Are these connected with lake size? Open
The size of a lake ecosystem sets many direct and indirect physical limits for habitats available for different food web compartments as well as the taxa inhabiting these. We tested the hypotheses that 1) reliance of fish on littoral resou…
View article: Pike Mercury Concentration in Small Boreal Headwater Lakes During Four Decades of Regional and Local Changes
Pike Mercury Concentration in Small Boreal Headwater Lakes During Four Decades of Regional and Local Changes Open
We measured the total mercury (THg) concentration in the muscle of northern pike ( Esox lucius L.) from 12 boreal headwater lakes once per decade during the 1980s to 2010s. Relations of pike THg to regional environmental changes, such as r…
View article: Biomass and sustainable yields of Eurasian perch (Perca fluviatilis) in small boreal lakes with respect to lake properties and water quality
Biomass and sustainable yields of Eurasian perch (Perca fluviatilis) in small boreal lakes with respect to lake properties and water quality Open
Understanding of factors that explain variation in potential fisheries yields is essential for the ecosystem-based management of lake fisheries. We used mark-recapture and Nordic survey net sampling to obtain estimates of Eurasian perch (P…
View article: Movements of pikeperch (<i>Sander lucioperca</i>), roach (<i>Rutilus rutilus</i>) and bream (<i>Abramis brama</i>) in a boreal lake, Lake Vesijärvi, Finland
Movements of pikeperch (<i>Sander lucioperca</i>), roach (<i>Rutilus rutilus</i>) and bream (<i>Abramis brama</i>) in a boreal lake, Lake Vesijärvi, Finland Open
Movements of common fish species in large lakes that are inadequately known is challenging for fisheries management. Pikeperch ( Sander lucioperca ) ( n = 478; mean length = 42.1 cm; SD = 7.0), bream ( Abramis brama ) ( n = 775; mean lengt…
View article: Size-based indicators for assessments of ecological status of coastal fish communities
Size-based indicators for assessments of ecological status of coastal fish communities Open
Human impact does not only affect the abundances of fish, but also the age- and size-distributions. Indicators of fish age and size-structures can hence be useful tools for fisheries- and environmental management. Size-based indicators hav…
View article: Ecosystem heating experiment reveals sex-specific growth responses in fish
Ecosystem heating experiment reveals sex-specific growth responses in fish Open
Size-specific body growth responses to warming are common among animal taxa, but sex-specific responses are poorly known. Here we ask if body growth responses to warming are sex-dependent, and if such sex-specific responses vary with size …
View article: Data for "Ecosystem heating experiment reveals sex-specific growth responses in fish"
Data for "Ecosystem heating experiment reveals sex-specific growth responses in fish" Open
Data for the paper "Ecosystem heating experiment reveals sex-specific growth responses in fish" in the Canadian Journal of Fisheries and Aquatic Sciences. One file contains the back-calculated fish length-at-age used for all analyses in th…
View article: Data for "Ecosystem heating experiment reveals sex-specific growth responses in fish"
Data for "Ecosystem heating experiment reveals sex-specific growth responses in fish" Open
Data for the paper "Ecosystem heating experiment reveals sex-specific growth responses in fish" in the Canadian Journal of Fisheries and Aquatic Sciences. One file contains the back-calculated fish length-at-age used for all analyses in th…
View article: Long‐term monitoring of pikeperch (<i>Sander lucioperca</i>) populations under increasing temperatures and predator abundances in the Finnish coastal waters of the Baltic Sea
Long‐term monitoring of pikeperch (<i>Sander lucioperca</i>) populations under increasing temperatures and predator abundances in the Finnish coastal waters of the Baltic Sea Open
The Baltic Sea has been under intense environmental changes in the recent decades, such as climate change, eutrophication and increasing abundance of top‐predators, which pose serious challenges to its aquatic life. For informed conservati…
View article: A pan-Baltic assessment of temporal trends in coastal pike populations
A pan-Baltic assessment of temporal trends in coastal pike populations Open
The northern pike (Esox lucius) is an iconic predatory fish species of significant recreational value and ecological role in the Baltic Sea. Some earlier studies indicate local declines of pike in the region, but a thorough spatial evaluat…
View article: Status and future perspectives for pikeperch (<i>Sander lucioperca</i>) stocks in Europe
Status and future perspectives for pikeperch (<i>Sander lucioperca</i>) stocks in Europe Open
Pikeperch ( Sander lucioperca ) is a European fresh and brackish water piscivorous fish, important as both a key predator and a valuable commercial and recreational fisheries species. There are concerns that some stocks are depleted due to…
View article: Cormorant predation mortality of perch (<i>Perca fluviatilis</i>) in coastal and archipelago areas, northern Baltic Sea
Cormorant predation mortality of perch (<i>Perca fluviatilis</i>) in coastal and archipelago areas, northern Baltic Sea Open
Perch (Perca fluviatilis) is an important prey species of the great cormorant (Phalacrocorax carbo sinensis) in the coastal waters of the northern Baltic Sea. The annual predation mortality caused by cormorants was estimated based on the c…
View article: The maternal effects on Pikeperch (<i>Sander lucioperca</i>) larvae depend on temperature
The maternal effects on Pikeperch (<i>Sander lucioperca</i>) larvae depend on temperature Open
We studied the influences of female pikeperch ( Sander lucioperca ) length and growth (i.e., maternal effects) on the length of hatched and starved larvae as well as on larval starvation resistance in two different temperature conditions (…
View article: High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery
High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery Open
High dissolved organic carbon and low pH are often associated with elevated mercury content of fish in boreal lakes, but less is known about the fish mercury dynamics in lakes recovering from acidification stress. We measured total mercury…