pdf35

Ribogospod. nauka Ukr., 2018; 3(45): 28-38
DOI: 10.15407/fsu2018.03.028
УДК 639.371.15:639.311

Forming a replacement-brood stock of European grayling Thymallus thymallus (Linnaeus) in artificial conditions

A. Kucheruk, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries of the National Academy of Sciences of Ukraine, Kyiv
A. Mruk, This email address is being protected from spambots. You need JavaScript enabled to view it. Institute of Fisheries of the National Academy of Sciences of Ukraine, Kiev
I. Buzevitch, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries of the National Academy of Sciences of Ukraine, Kyiv

Purpose. To develop methods for forming of a replacement-brood stock of the European grayling.

Methodology. In the course of the work, we used the generalized results of the studies performed during 2014-2017. Rearing age-1 and 1+ fish was done 135 m 2 ponds. Water temperature in the winter fluctuated within 2-5ºС.

Findings. During three years, we formed a replacement-brood stock of the European grayling of age-3 European grayling with a total number of 15 fish at the State Enterprise “Trout hatchery “Lopushno”. Eight months before spawning, artificial feeds were removed from the diet of brood grayling and they were replaced by natural feeds. Frozen chironomid larvae were used in the study. The feed conversion ratio of the natural feeds during rearing of brood stock was 6 units that corresponded to 12.82 kg.

The mean weight of domesticated brood fish used for the spawning was 181.3 g, mean length – 25.0 cm. Weights of males varied from 190 to 260 g, those of females – from 134 to 200 g; lengths of males varied from 26 to 32 cm, those of females – from 24.5 to 29.0 cm. Males exceeded the females by mean weight; a similar result was observed for the mean length, where males exceeded the females by 7%. Working fecundity of females was 2762±491 eggs. Fertilization rate was 60%.

Originality . For the first time in Ukraine, a holistic mechanism of scientific principles and methodical recommendations for artificial reproduction of the European graying was developed for the purpose of the following stocking of rivers, aimed at preserving their number in the water network of the Carpathian region.

Practical value. The results of the work are the basis for planning, conducting and controlling the results of the artificial reproduction of the European grayling of the Carpathian region.

Keywords: European grayling, initial stock, growing, survival, size and weight indices.

REFERENCES

1. Afanasev, S. O. (2006). Struktura biotychnykh uhrupovan ta otsinka ekolohichnoho stanu richok baseinu Tysy. Kyiv: Intertekhnodruk.

2. Alimov, A. F. (2006). Rol' biologicheskogo raznoobrazija v jekosistemah. Vestn. RAN, 76(11), 989-994.

3. Habchak, N. F. (2004). Suchasnyi proiav ruslovykh protsesiv ta spetsyfika protypavodkovoho zakhystu hospodarskykh obiektiv u baseini Tysy v mezhakh Zakarpatskoi oblasti. Naukovi zapysky Ternopilskoho natsionalnoho pedahohichnoho universytetu, 3 , 36-42.

4. Dubis, L. F. (1994). Metodyka ta osnovni rezultaty ekolohichnykh doslidzhen richkovykh baseiniv terytorii Zakarpatskoi oblasti. Visnyk Lviv. un-tu, 19, 70-79.

5. Mruk, A. I., Velykopolskyi, I. Y., & Ustych, V. I. (2012). Yevropeiskyi kharius baseina r. Tereblia ta aspekty yoho shtuchnoho vidtvorennia. Rybohospodarska nauka Ukrainy, 1, 53-60.

6. Mruk, A. I., Ustych, V. I., & Maslianka, I. I. (2005). Suchasnyi stan ta perspektyvy vidtvorennia tsinnykh lososevykh vydiv ryb v Zakarpatti. Problemy vosproyzvodstva aboryhennykh vidov ryb: nauch. sb. Kyiv: Svit rybalky, 196-200.

7. Tishkov, A. A. (2006). Teorija i praktika sohranenija bioraznoobrazija. K metodologii ohrany zhivoj prirody v Rossii. Jekol. vestn. Rossii, 10, 9-12.

8. Handozhevskaja, A. I., Mruk, A. I., & Velikopol'skij, I. I. (2013). Harakteristika evropejs'kogo hariusa (Thymallus thymallus (L.)) iz r. Krasnoshurka. Tret'ja Mezhdunar. konf. molodyh uchenyh NACEE: tezisy dokl. Sankt-Peterburg, 54-55.

9. Fomin, V. K., & Ostrovskij, M. P. (1992). Nerestovaja migracija yevropejskogo harіusa (Thymallus thymallus L.) v ruch'evyh uslovijah. Raspredelenie i povedenie ryb. Moskva: In-t jevoljuc. morfol. i jekol. zhivotnyh AN SSSR, 89-107.

10. Mruk, A., & Ustych, V. First experience of artificial reproduction of the european grayling (Thymallus thymallus) in Ukraine. International Workshop on the Restoration of fish Populations, Dusseldorf, Germany. Dusseldorf, 63.

11. Peňáz, M. (1975). Early development of the grayling Thymallus thymallus (Linnaeus, 1758). Acta Scientiarium Naturalium Academiae Scientiarum Bohemoslovacae Brno, 9 , 1-35.

12. Witkowski, A. (1975). The grayling (Thymallus thymallus (L.)) from the rivers of lower Silesia, Poland. Acta hydrobiol, 17, 355-370.