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Figure 4. Spraying a in Fighting an invasive fish parasite in subarctic Norwegian rivers - The end of a long story?

Figure 4. Spraying a groundwater-fed side channel of the Skibotn River with portable backpack mounted pump. Surviving G. salaris infested arctic char was found in this location after the previous treatments in 1988 and 1995. In 2015 and 2016 this and similar locations was treated several times by different teams using both Vectocarb, CatSan hygiene litter saturated with CFT-Legumine and conventional spraying with water of high rotenone concentration. Photograph by Dag H. Karlsen.

Figure 2 in Fighting an invasive fish parasite in subarctic Norwegian rivers - The end of a long story?

Figure 2. Mapping of groundwater influx in the River Signaldalselva. The mapping was done by parallel logging of GPS position and temperatures along the riverbanks at late summer, the time of year with the highest temperature contrasts between surface water and upwelling groundwater. Photograph by Norwegian Veterinary Institute.

Figure 1 in Fighting an invasive fish parasite in subarctic Norwegian rivers - The end of a long story?

Figure 1. The large map shows the rivers (in red) with G. salaris in the Skibotn Region. Orange marks rivers treated without findings of the parasite. All rivers and brooks potentially inhabiting salmonids south of the black line across the Lyngen-fjord were treated. Inserted map shows the location in Norway.

Figure 3 in Fighting an invasive fish parasite in subarctic Norwegian rivers - The end of a long story?

Figure 3. Spraying the riverbank of the River Signaldalselva with water of high rotenone concentration. The iconic mountain Otertind in the background. Photograph by Dag H. Karlsen.

opencc-by-4.0Jan 2020View details →

Figure 1 in Experimental evidence that the invasive snail Potamopyrgus antipodarum (Gray, 1843) survives passage through the digestive tract of common riverine fish

Figure 1. The Number of ingested P. antipodarum individuals per fish (red bars) and the number of snails that survived passing through the digestive tract (green bars). Values are mean ± standard deviation.

opencc-by-4.0Jun 2013View details →

Fig. 1 in Invasion risks posed by ornamental freshwater fish trade to southeastern Brazilian rivers

Fig. 1. Cities and watersheds within the Minas Gerais State, Brazil, where the 39 ornamental fish stores were visited.

opencc-by-4.0Jun 2013View details →

Fig. 2. A in Invasion risks posed by ornamental freshwater fish trade to southeastern Brazilian rivers

Fig. 2. A model describing the invasion stages that species must pass in order to represent an invasion risk for rivers in Minas Gerais State, Brazil.

Fig. 1 in Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

Fig. 1. Mean (± S.E.M) bimonthly variations of the gonadosomatic index in Metynnis maculatus females (n = 36). The different letters indicate significant differences among months. (ANOVA, Tukey test, P <0.05).

Fig. 5 in Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

Fig. 5. (a) Pearson correlation between the volume density of final vitellogenic oocytes and the gonadosomatic index (GSI) (%) during the reproductive cycle of Metynnis maculatus females (n = 36). (b) Pearson correlation between the volume density of post-ovulatory follicles and the GSI (%) (n = 36). (c) Pearson correlation between the E 2 plasma levels and the GSI (%) (n = 20). (d) Pearson correlation between the 17α-OHP plasma levels and the GSI (%) (n = 20). (e) Pearson correlation between the E 2 plasma levels and the volume density of final vitellogenic oocytes (n = 20). (f) Pearson correlation between the 17α-OHP plasma levels and the volume density of the post-ovulatory follicles (n = 20). The continuous line indicates that the difference is statistically significant (Pearson's test, P <0.05).

Fig. 4 in Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

Fig. 4. (a) Mean (± S.E.M) bimonthly plasma concentrations of E 2 in Metynnis maculatus females (n = 20). Different letters indicate significant differences among months (ANOVA, Tukey test, P <0.05). (b) Mean (± S.E.M) bimonthly plasma 17α – OHP concentrations (n = 20). Different letters indicate significant differences among months. (ANOVA, Tukey test, P <0.05).

Fig. 3 in Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

Fig. 3. Mean percentages (± S.E.M) of different oocyte types from Metynnis maculatus females during the ovarian maturation cycle. Different letters indicate significant differences among the same type of oocytes among months (ANOVA, Tukey test, P <0.05).

Fig. 2 in Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

Fig. 2. Photomicrographs of different oocyte types observed during the Metynnis maculatus reproductive cycle. (a) Previtellogenic oocytes showing multiple nucleolus (arrow), (b) Cortical alveoli oocyte; (c) Early vitellogenic oocyte with cytoplasm filled mostly with cortical alveoli (asterisk); (d) Final vitellogenic oocyte with cytoplasm completely filled with protein yolk granules (asterisk); (e) Post ovulatory follicles with numerous border folding (arrow), (f) Atretic oocytes with fragmented vitelline membrane (arrow) and a change in the appearance of the cytoplasm (asterisk). Hematoxylin-floxin. Scale bar = 100 µM..

Fig. 7 in Reciprocal Predation Between Preserved And Invasive Species: Adult Bombina Bombina Predate Young Whitebaits Of Alien Fish Perccottus Glenii

Fig. 7. Dynamics of relative predation (% from existed number of live whitebaits) for all model populations of B. bombina.

Fig. 1 in Reciprocal Predation Between Preserved And Invasive Species: Adult Bombina Bombina Predate Young Whitebaits Of Alien Fish Perccottus Glenii

Fig. 1. Overlapping areas of B. bombina and P. glenii distribution in Latvia (Pupina et al. In press).

Fig. 9 in Reciprocal Predation Between Preserved And Invasive Species: Adult Bombina Bombina Predate Young Whitebaits Of Alien Fish Perccottus Glenii

Fig. 9. Scheme of the reciprocal predation between B. bombina and its invasive threat P. glenii registered in the study.

Fig. 5 in Reciprocal Predation Between Preserved And Invasive Species: Adult Bombina Bombina Predate Young Whitebaits Of Alien Fish Perccottus Glenii

Fig. 5. Number of left live, predated, and died/ killed P. glenii in all experimental groups in total after the experiment.

Fig. 3 in Reciprocal Predation Between Preserved And Invasive Species: Adult Bombina Bombina Predate Young Whitebaits Of Alien Fish Perccottus Glenii

Fig. 3. Dynamics of number of live, predated, and died/killed P. glenii in different B. bombina model populations (Bb-1, Bb-2, Bb-3, and Bb-4).

opencc-by-4.0Dec 2016View details →

Fig. 3 in Behavioral Responses Of Salmonid Fingerlings To New Invasive Fish Predator Perccottus Glenii

Fig. 3. Video recording of the experiment. The biggest fish is the predator Perccottus glenii, smaller - tiger trout fingerlings.

opencc-by-4.0Dec 2016View details →

Fig. 1 in Behavioral Responses Of Salmonid Fingerlings To New Invasive Fish Predator Perccottus Glenii

Fig. 1. Scheme of the experimental basin and video recordering. Black fish – predator, white fishes – fingerlings, gray – pipe for releasing of predator.