Seawater acclimation of diploid and triploid brook charr (Salvelinus fontinalis), diploid Arctic charr (Salvelinus alpinus), and their diploid and triploid hybrids

1995 ◽  
Vol 46 (2) ◽  
pp. 302-316 ◽  
Author(s):  
S. Dumas ◽  
C. Audet ◽  
J. M. Blanc ◽  
J. de la Noue
Keyword(s):  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Brook Charr ◽  
Seawater Acclimation

A survey of the parasites of nonanadromous and anadromous brook charr (Salvelinus fontinalis) in the Tabusintac River, New Brunswick, Canada

1987 ◽  
Vol 65 (6) ◽  
pp. 1354-1362 ◽  
Author(s):  
Jack P. Frimeth
Keyword(s):  
New Brunswick ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
The Arctic ◽  
Brook Charr ◽  
New Host ◽  
Marine Parasites ◽  
First Time ◽  
Hysterothylacium Aduncum

A parasite survey of 1146 brook charr (Salvelinus fontinalis) was conducted between January 1981 and December 1982 in the Tabusintac River, New Brunswick, Canada. A total of 36 parasite species were recovered, of which 18 (one Myxosporea, two Monogenea, three Digenea, three Cestoidea, five Nematoda, one Acanthocephala, one Hirudinoidea, one Crustacea, and a Dermocystidium sp.) were freshwater and 18 (two Monogenea, seven Digenea, two Cestoidea, two Nematoda, two Acanthocephala, and three Crustacea) were marine. Anadronomous charr were differentiated from nonanadromous charr in fresh water by the presence of marine parasites. Charr in the estuary and lagoon were all considered to be anadromous; however, first-time anadromous charr or smolts were differentiated by the absence of marine parasites and infection with freshwater parasites only. New host records include Lecithaster gibbosus, Zoogonus lasius, Podocotyle angulata, Cryptocotyle lingua (metacercariae), Stephanostomum tenue (metacercariae, adults), Eubothrium crassum, Tetraphyllidea gen. sp. (plerocercoids), Eustrongylides sp. (larvae), Hysterothylacium aduncum (larvae, adults), Corynosoma magdaleni (juveniles), Argulus alosae, and Ergasilus labracis. Zoogonus lasius and Stephanostomum tenue represent new Canadian records, and Chloromyxum truttae and Truttaedacnitis truttae are reported for the first time from New Brunswick. Bulbodacnitis alpinus, previously reported only from the Arctic charr (Salvelinus alpinus), is considered to be a synonym of T. truttae.

scholarly journals Linseed oil as a substitute for fish oil in the diet of Arctic charr (Salvelinus alpinus), brook charr (S. fontinalis) and their reciprocal hybrids.

2022 ◽  
Vol 22 ◽  
pp. 100949
Author(s):  
Bernard-Antonin Dupont-Cyr ◽  
Nathalie R. Le François ◽  
Felix Christen ◽  
Véronique Desrosiers ◽  
Arianne Savoie ◽  
...  
Keyword(s):  
Fish Oil ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Linseed Oil ◽  
Brook Charr ◽  
Reciprocal Hybrids

Increased susceptibility of salmonids to the monogenean Gyrodactylus salaris following administration of hydrocortisone acetate

Parasitology ◽  
2000 ◽  
Vol 120 (1) ◽  
pp. 57-64 ◽  
Author(s):  
P. D. HARRIS ◽  
A. SOLENG ◽  
T. A. BAKKE
Keyword(s):  
Salmo Trutta ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Hydrocortisone Acetate ◽  
Hydrocortisone Administration ◽  
Resistant Group ◽  
Parasite Populations ◽  
Practical Level ◽  
Increased Susceptibility

Gyrodactylus salaris infects numerous salmonid species, ranging from the fully susceptible (Norwegian strains of Salmo salar), through species which, though initially susceptible, eventually eliminate their infections (Salvelinus alpinus and S. fontinalis) to entirely resistant (Salmo trutta) species. Here we describe experiments in which Salvelinus alpinus, S. fontinalis and Salmo trutta, implanted with hydrocortisone acetate to simulate stress-induced immunosuppression, were challenged with G. salaris. With previously uninfected Salvelinus fontinalis, G. salaris infections on fish treated with hydrocortisone acetate grew larger, and for longer, than on sham-treated controls. A similar result was obtained with S. trutta. Patterns of infection on Arctic charr, Salvelinus alpinus, were more complex, because individual fish varied from susceptible to highly resistant. Fish were therefore initially infected with G. salaris, and the most highly resistant group of individuals identified and disinfected. After 6 months recovery from this primary infection, hydrocortisone acetate was administered to half the fish, and all were challenged with G. salaris. Parasite populations on the hydrocortisone-treated individuals were consistently larger than those on the sham-treated controls, exceeding 30 parasites per fish after 5 weeks, in comparison with less than 10 parasites per fish on controls. These results indicate that hydrocortisone administration can lead to enhanced gyrodactylid populations on a range of salmonids. This suggests that the response to G. salaris is mediated by the immune system, and that the spectrum of responses observed in different species are, at least in part, due to the same mechanism. At a practical level, stress-induced immunosuppression during handling and transport of cultured salmonids may prove an important factor in the dissemination of G. salaris between watersheds.

scholarly journals Sex-specific co-expression networks and sex-biased gene expression in the salmonid Brook Charr Salvelinus fontinalis

2018 ◽  
Author(s):  
Ben J. G. Sutherland ◽  
Jenni M. Prokkola ◽  
Céline Audet ◽  
Louis Bernatchez
Keyword(s):  
Gene Expression ◽  
Sex Differences ◽  
Sexual Dimorphism ◽  
Network Analysis ◽  
Salvelinus Fontinalis ◽  
Sex Chromosome ◽  
Arctic Charr ◽  
Functional Enrichment ◽  
Brook Charr ◽  
Individual Gene

ABSTRACTNetworks of co-expressed genes produce complex phenotypes associated with functional novelty. Sex differences in gene expression levels or in the structure of gene co-expression networks can cause sexual dimorphism and may resolve sexually antagonistic selection. Here we used RNA-sequencing in the paleopolyploid salmonid Brook Charr Salvelinus fontinalis to characterize sex-specific co-expression networks in the liver of 47 female and 53 male offspring. In both networks, modules were characterized for functional enrichment, hub gene identification, and associations with 15 growth, reproduction, and stress-related phenotypes. Modules were then evaluated for preservation in the opposite sex, and in the congener Arctic Charr Salvelinus alpinus. Overall, more transcripts were assigned to a module in the female network than in the male network, which coincided with higher inter-individual gene expression and phenotype variation in the females. Most modules were preserved between sexes and species, including those involved in conserved cellular processes (e.g. translation, immune pathways). However, two sex-specific male modules were identified, and these may contribute to sexual dimorphism. To compare with the network analysis, differentially expressed transcripts were identified between the sexes, finding a total of 16% of expressed transcripts as sex-biased. For both sexes, there was no overrepresentation of sex-biased genes or sex-specific modules on the putative sex chromosome. Sex-biased transcripts were also not overrepresented in sex-specific modules, and in fact highly male-biased transcripts were enriched in preserved modules. Comparative network analysis and differential expression analyses identified different aspects of sex differences in gene expression, and both provided new insights on the genes underlying sexual dimorphism in the salmonid Brook Charr.

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