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54 results for “Silurus”
Figure S2 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure S2. – Cumulative distance and number of recorded movements upstream and downstream versus waterflow between October 2020 and March 2021 for European catfish.
Figure 10 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 10. – Correspondence of the positions of the pike no 64 and the European catfish no. 117 on the 2nd and 4th or February. The cross corresponds to the place where the pike's tag was retrieved, on the 17th of February. The European catfish is seen alone in the river nearby on the 23rd.
Figure 9 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 9. – Distance (in meters) from the Berry-au-Bac dam KP of the 5 smaller catfishes (light) and the two larger (dark) versus time (a) or size (b)
Figure 8 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 8. – Successive positions of the pike no. 166 during and after flood and supposed route that was followed.
Figure 5 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 5. – Kilometric points recorded (A) and fixes (B) of the pike no 83 between October 2020 and March 2021.
Figure 4 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 4. – Kilometric points recorded (A) and fixes (B) of the pike no 155 between October 2020 and March 2021.
Figure 1 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 1. – Map of the study site and locations of fixed antennas, points of interest, and maximum extension of the flooded area estimated from field observations, GPS recordings and analysis of the contours of the land.
Figure 1 in Dietary comparison of pike-perch, Sander lucioperca (Linnaeus, 1758) and catfish, Silurus glanis Linnaeus, 1758 in Sidi Salem dam reservoir (Tunisia)
Figure 1. – Locations of the sampling stations in Sidi Salem reservoir. S1: Downstream, S2: Oued Zargha, S3: Central station, S4: Upstream.
Fig. 2 in An alien parasite affects local fauna-Confirmation of Sinergasilus major (Copepoda: Ergasilidae) switching hosts and infecting native Silurus glanis (Actinopterygii: Siluridae) in Hungary
Fig. 2. Evolutionary history of Sinergasilus based on Bayesian Inference (BI) analysis of 18S rDNA with Ergasilus anchoratus Markewitsch, 1940 designated as outgroup. Support for both maximum likelihood (ML, 1000 bootstrap replicates) and BI (10 million MCMC) indicated at nodes (ML/BI), only nodes with more than 50% support annotated.
Fig. 1 in An alien parasite affects local fauna-Confirmation of Sinergasilus major (Copepoda: Ergasilidae) switching hosts and infecting native Silurus glanis (Actinopterygii: Siluridae) in Hungary
Fig. 1. Micrographs using light microscopy (LM) and scanning electron microscopy (SEM) of Sinergasilus major; (A) Total body (SEM), (B) rostral plate with integumental pores and tactile setules (SEM), (C) thoracic plate with pectinate denticles (SEM), (D) ventral aspect of cephalon (SEM), (E) everted mouth (SEM), (F) inverted mouth (SEM), (G) ventral view of mouth parts (SEM), (H) mouth parts (LM). A1 – antennule 1, A2 – antenna, Ip – integumental pore, Gs – genital somite, Lb – labium, Lr – labrum, M – mouth, Md – mandible, Ml – maxillule, Mx – maxilla, Ps4 – pedigerous somite 4, Pd – pectinate denticles, Tp – thoracic plate, Ts – tactile setules.
Fig. 2 in Reproductive strategies of the parasitic flatworm Thaparocleidus vistulensis (Siwak, 1932) (Platyhelminthes, Monogenea) infecting the European catfish Silurus glanis Linnaeus, 1758
Fig. 2. The gills of infected fingerling European catfish by T. vistulensis. (A) Developing T. vistulensis attached to the normal gill filaments (arrows) at 2 dpi; (B) Abundance of T. vistulensis on the gill at 10 dpi; (C) (D) Sexually mature monogenean with egg inside the body (arrows) situated on the heavily injured gill at 10 dpi. Scale bars represent 200 μm.
Fig. 1 in Reproductive strategies of the parasitic flatworm Thaparocleidus vistulensis (Siwak, 1932) (Platyhelminthes, Monogenea) infecting the European catfish Silurus glanis Linnaeus, 1758
Fig. 1. Average infection dynamics of Thaparocleidus vistulensis. The First Trial and Second Trial refer to the primary axis (left side), while the Third Trial refers to the secondary axis (right side).
Fig. 3 in Reproductive strategies of the parasitic flatworm Thaparocleidus vistulensis (Siwak, 1932) (Platyhelminthes, Monogenea) infecting the European catfish Silurus glanis Linnaeus, 1758
Fig. 3. Light micrographs of egg development of T. vistulensis. (A) Adult T. vistulensis with an egg inside its body; (B) egg right after oviposition; (C) Egg after 6 hpo; (D) Egg after 24 hpo; (E) (F) Eggs between 24 and 48 hpo: (E) The whole embryo, (F) Larva with primordia of scattered pigment of eyespots and primordia of hamulus; (G) Eggs between 48 and 72 hpo: Developing larva with marginal hooklets and ciliated cells, ventral view; (H) (I) Eggs after 72 hpo: (H) Developed larva before eclosion with anchors and (I) marginal hooklets, lateral view; (J) Moment of eclosion; (K) Empty egg shell with opened operculum; (L) Recently hatched oncomiracidium. Abbreviations: ac, anterior cilia; ca, central anchor; e, eyespot; lc, lateral cilia; mh, marginal hooklets; o, operculum; pc, posterior cilia; pe, primordial eyespot; ph, primordia of hamulus. Scale bars represent 20 μm except for (A), (J), and (L) 50 μm.
Fig. 3 in Exorchis sp. in the catfish Silurus asotus and Oncomelania hupensis in marshlands of Poyang Lake, China: A potential biological control tool for Schistosoma japonicum
Fig. 3. The prevalence of Exorchis sp. in S. asotus collected from the marshland of Poyang Lake from 2012 to 2016. (A) The adult S. asotus fish collected from Shi Li Hu were kept in plastic containers supplied with water. (B) The intestine of collected S. asotus fish were dissected in a glass Petri dish containing 0.75% saline solution. (C) The isolated Exorchis sp. adult trematodes isolated from the intestine of infected S. asotus. (D) The infection rate of Exorchis sp. in S. asotus is 56.82%, 75.56%, 67.09%, 63.81% and 72.18% from 2012 to 2016, respectively. (E) The intensity of infection of Exorchis sp. in S. asotus is 14.45, 15.24, 16.87, 14.18 and 12.22 per fish from 2012 to 2016, respectively. (F) The average infection rate of Exorchis sp. in S. asotus collected from the marshland of Poyang Lake from 2012 to 2016 was 65.79%. (G) The average intensity of infection of Exorchis sp. in S. asotus collected from the marshland of Poyang Lake from 2012 to 2016 was 14.21 per fish.
Fig. 2 in Exorchis sp. in the catfish Silurus asotus and Oncomelania hupensis in marshlands of Poyang Lake, China: A potential biological control tool for Schistosoma japonicum
Fig. 2. The infection rate of Exorchis sp. in O. hupensis collected from the marshland of Poyang Lake from 2012 to 2015. (A) The natural habitat of O. hupensis. (B) High grass region inhabited by large numbers of O. hupensis are shown, and the snails were marked with red arrows. (C) The cercaria of Exorchis sp. collected from O. hupensis. (D) The infection rate of Exorchis sp. in O. hupensis was 1.87%, 0.51%, 1.06% and 0.14% from 2012 to 2015, respectively. (E) The average infection rate of Exorchis sp. in O. hupensis collected from the marshland of Poyang Lake from 2012 to 2015 was 1.11%. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in Exorchis sp. in the catfish Silurus asotus and Oncomelania hupensis in marshlands of Poyang Lake, China: A potential biological control tool for Schistosoma japonicum
Fig. 1. Geographical location of the study area. Poyang Lake is located in the middle and lower reaches of the Yangtze River and in the north of Jiangxi Province. This study was conducted at Shi Li Hu (29◦ 25′ N, 116◦ 01′ E) in Xingzi county, Jiujiang City, Jiangxi Province, which is located on the western bank of the Poyang Lake in southern China.
Exceptional longevity in northern peripheral populations of Wels catfish (Silurus glanis)
<p>Studies of life-history variation across a species range are crucial for ecological understanding and successful conservation. Here, we examined the growth and age of Wels catfish (Silurus glanis) in Sweden, which represent the northernmost populations in Europe. A total of 1183 individuals were captured, marked and released between 2006 and 2020. Mark-recapture data from 162 individuals (size range: 13–195 cm) were used to estimate von Bertalanffy growth curve parameters which revealed very slow growth rates compared to catfish within the core distribution area (central Europe). The fitted von Bertalanffy growth curve predicted a 150 cm catfish to be around 40 years old, while the largest recaptured individual (length 195 cm) was estimated to be 70 (95% CI 50–112) years old. This was substantially older than the previously documented maximum age of a catfish. The weight at length relationships in these northern peripheral populations were similar to those documented for catfish in central Europe indicating that resources did not constrain growth. This indicates that the slow growth and exceptional high age in the northern catfish populations are the result of lower temperatures and/or local adaptations.</p>
Figure 3 in Behaviour of two predator fishes Esox lucius Linnaeus, 1758 and Silurus glanis Linnaeus, 1758 during two successive floods in the French Aisne River
Figure 3. –Boxplot characterizing the sizes ranges per behavioural group of northern pikes
Fig. 4 in Reproductive strategies of the parasitic flatworm Thaparocleidus vistulensis (Siwak, 1932) (Platyhelminthes, Monogenea) infecting the European catfish Silurus glanis Linnaeus, 1758
Fig. 4. Average hatching rates of T. vistulensis larvae.
Fig. 5 in Reproductive strategies of the parasitic flatworm Thaparocleidus vistulensis (Siwak, 1932) (Platyhelminthes, Monogenea) infecting the European catfish Silurus glanis Linnaeus, 1758
Fig. 5. Average in vitro survival rates of T. vistulensis at different life stages.
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