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Fish Watcher Record |
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Contributor: Karel Šikl
| ID: 1640 Country: Czechia Address: Web page: |
| Update entries Point map FishWatcher records of this species | |||||
| Species: | Ameiurus nebulosus | ||||
| Attachment: | --- no attachment --- | ||||
| URL: | |||||
| Locality:* | Nymburk, under new malt plant | ||||
| Type: | River | ||||
| Salinity:* | freshwater | ||||
| Water depth: | 1 - 2 m | ||||
| Latitude:* | 50° 10.43' N Latitude (dec): 50.17383333842 | ||||
| Longitude:* | 15° 2.2' E Longitude (dec): 15.036666667461 | ||||
| Accuracy: | accurate | ||||
| Country:* | Czechia | ||||
| FAO area:* | Europe - Inland waters | ||||
| Temp.: | °C | ||||
| Date:* | 10/08/2008, dd/mm/yyyy | ||||
| Day time: | 20:00 - 22:00 h e.g. 13:00 - 15:00 | ||||
| Length:* | 24 cm Type:* TL | ||||
| Weight: | 220 g | ||||
| Abundance: | abundant (always seen in some numbers) | ||||
| Life stage: | adults | ||||
| Sex: | |||||
| Gear: | hook and line | ||||
| Source: | |||||
| Remark: | Some of below conclusions are, despite logical, speculative because for reliable results, exact research to be provided on much higher number of samples. Time is reported in Central European Summer Time, it means UTC is -2. Fishing was provided in the same place like in my previous report. I caught 29 pieces in two hours. Bait earthworm on bottom but at the time using float. The size varied between 11 - 24 cm. 13 pieces were over 20 cm, 14 pieces between 15 - 20 cm and two ones were small. I checked stercus of the caught fish. 25 of them had god barleycorn in their alimentary tract. Some of them were full of barley, some of them had got few pieces. Approx half of those with barley had even corn. Barley and corn are used by fishers to lure on carps. Barley comes in the river also from time to time leakages from malt plant. It seems to me that grain is a ballast food for Ameiurus nebulosus because in whole alimentary tract it is unchanged. Moreover quantity of grain and the shape correlate - no fat in abdominal cavity was found in fish fed with grain. But I did not provide exact measurement and documentation. The smallest two and two pieces from the group 15 - 20 cm were grain free and their alimentary tract contained black matter - benthos. By palpation I did not find any solid or sharp material (in some previous cases I found shells of shellfish up to 6 mm diameter). Three of the 13 biggest contained parts of small crayfish (species I am not able to identify - 5 species live in the Czech Republic, 3 of them introduced). I did not find a fish in any of caught bullheads despite the fact that they take bleak or small roach used as a bait. I think that brown bullhead takes anything which at the moment seems to it to be consumable. Such a species probably have an adverse impact to the environment but till the present time no research was provided in Czech Republic. | ||||
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