scholarly journals Distinctive site preference of the fish parasite Myxobolus cerebralis (Cnidaria, Myxozoa) during host invasion

2019 ◽  
Vol 67 (2) ◽  
pp. 212-223 ◽  
Author(s):  
Edit Eszterbauer ◽  
Dóra Sipos ◽  
Ágnes Szakály ◽  
Dávid Herczeg
Keyword(s):  
Rainbow Trout ◽  
Brown Trout ◽  
Fish Species ◽  
Fish Parasites ◽  
Gibel Carp ◽  
Site Preference ◽  
Infection Prevalence ◽  
Body Parts ◽  
Myxobolus Cerebralis ◽  
Type Host

Here, we experimentally studied the site preference of Myxobolus cerebralis, one of the most pathogenic myxozoan (Cnidaria, Myxozoa) fish parasites, which causes whirling disease in salmonids. Parasite invasion was examined in three fish species with various susceptibility levels: the type host brown trout, the highly susceptible rainbow trout, and the non-susceptible gibel carp, in which parasite spores do not develop. We investigated the first two hours of fish invasion, and measured the site preference of triactinomyxons (TAMs) during attachment and penetration of fish in three body parts (gills, fins, skin). Infection prevalence and intensity were estimated using a species-specific nested PCR, optimised in the present study. The highest infection prevalence was detected in the most susceptible fish species, rainbow trout. Interestingly, higher prevalence was observed in gibel carp than in the type host, brown trout (95.2% vs. 85.7%). Considering body locations, remarkable differences were detected in infection intensities. The highest intensity was observed in fins, whereas skin was the least infected body part in every fish species examined. Infection prevalence and intensity did not differ significantly among fish species. Thus, we confirmed that M. cerebralis TAMs cannot discern fish species. Furthermore, we proved experimentally that fish fin is significantly more attractive to fish-invading parasite TAMs than gills or skin.

scholarly journals Differences between white and red muscle fibers diameter in three salmon fish species

2014 ◽  
Vol 30 (2) ◽  
pp. 349-356 ◽  
Author(s):  
E. Karahmet ◽  
A. Viles ◽  
A. Katica ◽  
N. Mlaco ◽  
A. Toroman
Keyword(s):  
Skeletal Muscle ◽  
Body Weight ◽  
Rainbow Trout ◽  
Brown Trout ◽  
Fish Species ◽  
Brook Trout ◽  
Research Work ◽  
Main Peak ◽  
Average Weight ◽  
Cross Sectional

Because of skeletal muscle is the main contributor to body weight in most fish, it is probable that the species of the fish is limited by the growth of this tissue. Several aspects of both somatic size and skeletal muscle growth was investigated in this research work included a total of 20 brown trout (Salmo truta m. fario Lineus), 20 brook trout (Salvelinus alpinus) and 20 rainbow trout (Oncorynchus mykkis Walbaum), the average weight of 200 grams. Gathered data showed that rainbow trout has a faster increasing white muscles then other two fish species at same body weight. Main peak of diameter white muscles was 31-40 ?m (30.55%) and 41-50 ?m (22.15%) for rainbow trout. In mean time in the other two fish groups (brown trout and brook trout) was 21-30 ?m (40.1% or 39.27%) and 31-40 ?m (39.27% or 33.85%) of measured cross sectional areas. Distribution measured cross sectional areas of red muscles laniary goes down from the <20 ?m to >71 ?m.

scholarly journals The interaction of exposure and warming tolerance determines fish species vulnerability to warming stream temperatures

2018 ◽  
Vol 14 (9) ◽  
pp. 20180342 ◽  
Author(s):  
Annika W. Walters ◽  
Caitlin P. Mandeville ◽  
Frank J. Rahel
Keyword(s):  
Climate Change ◽  
Rainbow Trout ◽  
Brown Trout ◽  
Fish Species ◽  
Fish Assemblage ◽  
Thermal Tolerance ◽  
Stream Temperature ◽  
Vulnerable Species ◽  
Species Vulnerability ◽  
Vulnerability To Climate Change

Species vulnerability to climate change involves an interaction between the magnitude of change (exposure) and a species's tolerance to change. We evaluated fish species vulnerability to predicted stream temperature increases by examining warming tolerances across the Wyoming fish assemblage. Warming tolerance combines stream temperature with a thermal tolerance metric to estimate how much warming beyond current conditions a species can withstand. Brown trout, rainbow trout and burbot had the lowest warming tolerances and the highest proportion of currently occupied sites that will become unsuitable under predicted temperature increases. These most vulnerable species were coldwater species, but had neither the lowest thermal tolerances nor would they experience the greatest temperature increases. Our results highlight the importance of considering the interaction of exposure and warming tolerance when predicting climate change vulnerability and demonstrate an approach that can be applied broadly.

scholarly journals Morphological and hematological studies of Trypanosoma spp. infecting ornamental armored catfish from Guamá River-PA, Brazil

2013 ◽  
Vol 85 (3) ◽  
pp. 1149-1156 ◽  
Author(s):  
Rodrigo Y. Fujimoto ◽  
Mikaelle S. Neves ◽  
Ruda F.B. Santos ◽  
Natalino C. Souza ◽  
Marcia V.S. do Couto ◽  
...  
Keyword(s):  
Fish Species ◽  
Hematological Parameters ◽  
Infected Fish ◽  
Ornamental Fish ◽  
The Other ◽  
Infection Prevalence ◽  
Hematological Response ◽  
Morphometric Characterization

A total of 281 specimens of freshwater armored ornamental fish species (Leporacanthicus galaxias, Lasiancistrus saetiger, Cochliodon sp., Hypostomus sp., Pseudacanthicus spinosus, Ancistrus sp. and Rineloricaria cf. lanceolata) were captured at the hydrological basin of Guamá River, Pará, Brazil. The infection by Trypanosoma spp. was inspected. The morphological and morphometric characterization of the parasites and the hematological parameters were determined. Leporacanthicus galaxias and Pseudacanthicus spinosus presented 100% infection prevalence, and the other species showed a variable prevalence of infection. The parasites showed clearly different morphotypes and dimensions, and probably belong to different species. The hematological response to the infection varied with the host. Cochliodon sp. showed no differences between infected and not infected fish. In other species several modifications on some hematological parameters were found, but apparently without causing disease. It is emphasized the possibility of introduction of the parasites in new environments due to the artificial movements of these ornamental fish.

Brown Trout Removal Effects on Short-Term Survival and Movement ofMyxobolus cerebralis-Resistant Rainbow Trout

2015 ◽  
Vol 144 (3) ◽  
pp. 610-626 ◽  
Author(s):  
Eric R. Fetherman ◽  
Dana L. Winkelman ◽  
Larissa L. Bailey ◽  
George J. Schisler ◽  
K. Davies
Keyword(s):  
Rainbow Trout ◽  
Brown Trout ◽  
Short Term ◽  
Term Survival ◽  
Short Term Survival
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