Retention of ingested 110mAg by a freshwater fish, Salmo trutta L.

1990 ◽  
Vol 50 (3-4) ◽  
pp. 409-421 ◽  
Author(s):  
J. Garnier ◽  
J. P. Baudin
Keyword(s):  
Freshwater Fish ◽  
Salmo Trutta

scholarly journals Occurrence of intersex in wild freshwater fish in Slovenian rivers: a histological evaluation

2016 ◽  
Vol 67 (3) ◽  
pp. 216-222
Author(s):  
Milka Vrecl ◽  
Vlasta Jenčič
Keyword(s):  
Freshwater Fish ◽  
Salmo Trutta ◽  
Testicular Tissue ◽  
Histological Evaluation ◽  
Thymallus Thymallus ◽  
Barbus Barbus ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Rivers And Streams ◽  
Brown Trout Salmo Trutta ◽  
Insight Into

Abstract The aim of this preliminary research was to establish if there are intersex occurrences in wild freshwater fish in Slovenian rivers and streams. In the first study we evaluated all fish species of both sexes obtained from the river Ljubljanica from its source to mouth. In the second study we focused on the rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta m. fario) males from 30 rivers and streams in different parts of Slovenia. The male gonads were histologically assessed for the presence of oocytes to determine the frequency and degree of intersex. Oocytes were found in the testicular tissue of a single grayling (Thymallus thymallus) and in the adipose tissue adjacent to the testis of a single common barbel (Barbus barbus), both from the Ljubljanica. Several cyst-like structures that resemble degenerated presumptive oocytes were also present in several trout testes. This preliminary report is the first of its kind in Slovenia. To gain a better insight into the intersex issue in Slovenia, we plan to regularly biomonitor freshwater pollution by histologically examining fish gonads and, if possible, by determining vitellogenin plasma levels in fish.

Invasive freshwater fish (Leuciscus leuciscus) acts as a sink for a parasite of native brown trout Salmo trutta

2020 ◽  
Vol 22 (7) ◽  
pp. 2235-2250
Author(s):  
Paula A. Tierney ◽  
Joe M. Caffrey ◽  
Sebastian Vogel ◽  
Sharon M. Matthews ◽  
Emy Costantini ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta

Prevalence of Listeria, Aeromonas, and Vibrio Species in Fish Used for Human Consumption in Turkey

2010 ◽  
Vol 73 (2) ◽  
pp. 380-384 ◽  
Author(s):  
NİHAL YÜCEL ◽  
ŞENAY BALCI
Keyword(s):  
Freshwater Fish ◽  
Marine Fish ◽  
Salmo Trutta ◽  
Bacterial Pathogens ◽  
Health Hazard ◽  
Vibrio Species ◽  
Human Consumption ◽  
Vibrio Fluvialis ◽  
Fish Samples ◽  
Isolated Species

A total of 78 raw retail fish samples from 30 freshwater and 48 marine fish were examined for the presence of Listeria, Aeromonas, and Vibrio species. The overall incidence of Listeria spp. was 30% in freshwater samples and 10.4% in marine fish samples. Listeria monocytogenes (44.5%) was the most commonly isolated species in freshwater fish, and Listeria murrayi (83.5%) was the most commonly isolated species in marine fish samples. Motile aeromonads were more common in marine fish samples (93.7%) than in freshwater fish samples (10%). Vibrio alginolyticus, Vibrio fluvialis, and Vibrio damsela were isolated only in marine fish samples, representing 40.9, 38.6, and 36.3% of Vibrio isolates, respectively. In freshwater and marine fish, the highest incidences of Listeria and Aeromonas were found in skin samples; the highest incidence of Vibrio in marine fish was found in gill samples. The location of Listeria spp. and L. monocytogenes in a fish was significantly different among freshwater fish. A high incidence of these bacterial pathogens was found in the brown trout (Salmo trutta) and horse mackerel (Trachurus trachurus). Handling of contaminated fish, cross-contamination, or eating raw fish might pose a health hazard, especially in immunosuppressed individuals, elderly people, and children. This study highlights the importance of bacterial pathogens in fish intended for human consumption, but more study is needed.

Psychrobacters and Related Bacteria in Freshwater Fish

2000 ◽  
Vol 63 (3) ◽  
pp. 315-321 ◽  
Author(s):  
CÉSAR J. GONZÁLEZ ◽  
JESÚS A. SANTOS ◽  
MARÍA-LUISA GARCÍA-LÓPEZ ◽  
ANDRÉS OTERO
Keyword(s):  
Freshwater Fish ◽  
Salmo Trutta ◽  
Restriction Pattern ◽  
Aerobic Bacteria ◽  
Computer Assisted ◽  
Pair Group ◽  
The Family ◽  
Acinetobacter Spp ◽  
Small Clusters ◽  
Iced Storage

Three phenotypic identification systems were employed to identify 106 strains of gram-negative, nonmotile, aerobic bacteria obtained during iced storage of wild (Salmo trutta and Esox lucius) and farmed (Oncorhynchus mykiss) freshwater fish. Using diagnostic tables and computer-assisted identification, the isolates were Psychrobacter (64 strains), Acinetobacter (24 strains), Moraxella (6 strains), Chryseobacterium (5 strains), Myroides odoratus (2 strains), Flavobacterium (1 strain), Empedobacter (1 strain), and unidentified (3 strains). Overall similarities of all strains were determined for 108 characters by numerical analysis (simple matching coefficient of similarity [S] and clustering by unweighted pair group average linkage [UPGMA]). At the 77% similarity level, 92 strains formed nine major clusters (3 or more strains) and four small clusters (2 strains). Cluster 1 (25 isolates divided into two main subclusters) could be assigned to Psychrobacter phenylpyruvicus, clusters 2 and 3 (26 isolates) were designated as Psychrobacter immobilis, and clusters 4 (3 isolates) and 7 (4 isolates) were identified as Psychrobacter urativorans and Psychrobacter spp., respectively. Clusters 5 (five isolates), 6 (three isolates), and 9 (five isolates) were labeled as Acinetobacter spp., Acinetobacter johnsonii, and Acinetobacter lwoffii, respectively. Cluster 8 (12 isolates), with a high resemblance to Thornley's phenon 4 (a heterogeneous group of bacteria isolated from poultry and related to Acinetobacter), remained unnamed. The restriction pattern was identical for strains grouped into clusters 2 and 3 (P. immobilis) but was different for the remaining Psychrobacter isolates. A large proportion of isolates belonging to the family Moraxellaceae were closely related. Psychrobacters and A. johnsonii were present in freshly caught fish and river water. In the latter stages of storage, P. phenylpyruvicus and acinetobacters tended to decrease, whereas P. immobilis increased.

scholarly journals Repulsive Effect of Stroboscopic Light Barriers on Native Salmonid (Salmo trutta) and Cyprinid (Pseudochondrostoma duriense and Luciobarbus bocagei) Species of Iberia

2019 ◽  
Vol 11 (5) ◽  
pp. 1332 ◽  
Author(s):  
Joaquim Jesus ◽  
Amílcar Teixeira ◽  
Silvestre Natário ◽  
Rui Cortes
Keyword(s):  
Freshwater Fish ◽  
Brown Trout ◽  
Fish Species ◽  
Salmo Trutta ◽  
Light Stimulus ◽  
Fish Behavior ◽  
Deterrent Effect ◽  
Strobe Light ◽  
Brown Trout Salmo Trutta ◽  
Behavioral Barriers

A repulsive effect, that some induced primary stimuli, like sound and light, is known to be provoked in fish behavior. In the present study, two strobe light frequencies, 350 flashes/minute and 600 flashes/minute, were tested in laboratorial conditions, using three native freshwater fish species of northern Portugal: Brown trout (Salmo trutta), Northern straight-mouth nase (Pseudochondrostoma duriense) and Iberian barbel (Luciobarbus bocagei). The results showed a differential repulsive behavior of the fish species to light stimulus, and particularly to a frequency of 600 flashes/minute. S. trutta presented the most repulsive behavior, whereas the L. bocagei showed less repulsion to the light stimulus. No relevant differences were found between pre-test and post-assessments, confirming a rapid recovery of natural fish behavior after the deterrent effect. The results highlighted the potential of behavioral barriers, particularly in salmonid streams, based on strobe light stimulus.

A review of radio and acoustic telemetry studies of freshwater fish in New Zealand

2009 ◽  
Vol 60 (4) ◽  
pp. 321 ◽  
Author(s):  
Don Jellyman
Keyword(s):  
New Zealand ◽  
Freshwater Fish ◽  
Acoustic Telemetry ◽  
Native Species ◽  
Salmo Trutta ◽  
Oncorhynchus Tshawytscha ◽  
Home Ranges ◽  
Catch And Release ◽  
Anguilla Australis ◽  
Fish Energetics

Radio and acoustic telemetry have been used in 24 studies of freshwater fish in New Zealand. Although most native species are too small to carry these tags, studies using telemetry have been carried out on four of the larger species, i.e. lampreys (Geotria australis), shortfin and longfin eels (Anguilla australis and A. dieffenbachii) and giant kokopu (Galaxias argenteus). Among the introduced species, telemetry has been used to study movements of brown and rainbow trout (Salmo trutta and Oncorhynchus mykiss) in both rivers and lakes, chinook salmon (Oncorhynchus tshawytscha), koi carp (Cyprinus carpio) and bullhead catfish (Ameiurus nebulosus). To date, studies have almost exclusively been of short-term movements and seasonal migrations. Study objectives range from measuring microhabitats and home ranges to determining the extent of seasonal spawning migrations. The advent of progressively smaller tags will provide increased opportunities to use this technology on a wider range of fish species. Management implications of several studies are presented. Although biotelemetry studies have not yet been used in New Zealand, there are considerable opportunities for using such technology to increase understanding of fish energetics and also stress associated with catch-and-release practices in recreational fishing.

Accumulation from water and depuration of 110mAg by a freshwater fish, salmo trutta L.

1990 ◽  
Vol 24 (11) ◽  
pp. 1407-1414 ◽  
Author(s):  
J Garnier ◽  
J.P Baudin ◽  
L Foulquier
Keyword(s):  
Freshwater Fish ◽  
Salmo Trutta
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