arctic char
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Ecosystems ◽  
2022 ◽  
Author(s):  
Sven Norman ◽  
Karin A. Nilsson ◽  
Marcus Klaus ◽  
David Seekell ◽  
Jan Karlsson ◽  
...  

AbstractEcological theory predicts that the relative distribution of primary production across habitats influence fish size structure and biomass production. In this study, we assessed individual, population, and community-level consequences for brown trout (Salmo trutta) and Arctic char (Salvelinus alpinus) of variation in estimated habitat specific (benthic and pelagic) and total whole lake (GPPwhole) gross primary production in 27 northern oligotrophic lakes. We found that higher contribution of benthic primary production to GPPwhole was associated with higher community biomass and larger maximum and mean sizes of fish. At the population level, species-specific responses differed. Increased benthic primary production (GPPBenthic) correlated to higher population biomass of brown trout regardless of being alone or in sympatry, while Arctic char responded positively to pelagic primary production (GPPPelagic) in sympatric populations. In sympatric lakes, the maximum size of both species was positively related to both GPPBenthic and the benthic contribution to GPPWhole. In allopatric lakes, brown trout mean and maximum size and Arctic char mean size were positively related to the benthic proportion of GPPWhole. Our results highlight the importance of light-controlled benthic primary production for fish biomass production in oligotrophic northern lakes. Our results further suggest that consequences of ontogenetic asymmetry and niche shifts may cause the distribution of primary production across habitats to be more important than the total ecosystem primary production for fish size, population biomass, and production. Awareness of the relationships between light availability and asymmetric resource production favoring large fish and fish production may allow for cost-efficient and more informed management actions in northern oligotrophic lakes.


Author(s):  
Véronique Dubos ◽  
André St-Hilaire ◽  
Normand E Bergeron

Arctic char is a fish species known to occupy diverse habitats within the Arctic region. However, summer habitat use during the juvenile stage of the anadromous form is largely unknown. The present study aims to characterize fry and parr summer habitat preferences. Surveys were conducted by electrofishing, associated with physical habitat characterization on several rivers of the Ungava Bay, Nunavik, Canada. At the microhabitat and station scales, fry showed significant habitat preferences for shallow water and slow velocity. At the mesohabitat scale, fry showed a significant habitat selectivity for riffles. This habitat selectivity implies that habitat models can be built to evaluate the potential of habitat suitability for Arctic char fry. However, no significant habitat selectivity was found for parr. Parr size was nonetheless positively correlated with velocity, which was found to be a limitative factor for juvenile habitat use. This first attempt at modeling juvenile anadromous Arctic char habitat in rivers emphasizes the importance of selecting an appropriate spatial scale and reiterates the fact that parr showed relatively high plasticity in stream habitat selection.


Author(s):  
V. V. Pospekhov ◽  
◽  
G. I. Atrashkevich ◽  
O. M. Orlovskaya ◽  
E. I. Mikhailova ◽  
...  

The first data on the parasite fauna of fish from the mountain lakes Bolshoy and Maly Darpir at the southern spurs of the Chersky Ridge (Momsky District, Yakutia) are presented. 7 species of fish have been studied, in which 34 species of parasites have been found: 33 species of helminths and 1 species of parasitic copepods, belonging to 22 genera, 16 families, 12 orders, 7 classes of 4 types of the animal kingdom. Trematodes completely dominate by the number of species among helminths (16 species); cestodes are half as many (8 species); these are followed by nematodes and spiny-headed worms (5 and 4 species, respectively). The greatest variety of parasites was found in the East Siberian grayling (22 species) and the Arctic char (19 species). Next to the latter in terms of the number of parasite species, there went the Kolyma sculpin (13 species), round whitefish (10 species each), sucker (9 species), eelpout, and common minnow (7 species each). Only one parasite species, the Neoechinorhynchus salmonis Ching, 1984 spiny-headed worm, is common for all studied fish. The second species of spiny-headed worms, Pseudoechinorhynchus borealis (Linstow, 1901), not found only in the round whitefish, was first recorded in fish of the Okhotsk-Kolyma area and in the sucker as a new definitive host.


Fisheries ◽  
2021 ◽  
Vol 2021 (6) ◽  
pp. 104-112
Author(s):  
Vladimir Nikandrov ◽  
Nina Shindavina ◽  
Viktor Golod ◽  
Anatoly Lukin

Based on the long-term experience of keeping Ladoga palia in factory conditions, methodological approaches to the reproduction of this species and a scheme for its cultivation are proposed, which can be used as a basis for breeding Arctic char in fish hatcheries. The characteristics of the object of research and the prospects of its use in aquaculture are given. The features of the development of embryos and larvae are considered. The scheme of formation and operation of repair-brood herds of Ladoga palia is proposed. The criteria for selecting producers for repair and breeding herds are substantiated.


Author(s):  
Lars J. Hammer ◽  
Nigel E. Hussey ◽  
Marianne Marcoux ◽  
Harri Pettitt-Wade ◽  
Kevin Hedges ◽  
...  

2021 ◽  
Author(s):  
Xavier Dallaire ◽  
Normandeau Éric ◽  
Julien Mainguy ◽  
Jean‐Éric Tremblay ◽  
Louis Bernatchez ◽  
...  

Author(s):  
Raz Ben-Asher ◽  
Guðmundur Stefánsson ◽  
Aðalheiður Ólafsdóttir ◽  
Hagai Mayer ◽  
Ran Nahir ◽  
...  

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