DETERMINATION OF THE OPTIMAL WEIGHT AND DENSITY OF JUVENILE PIKEPERCH (SANDER LUCIOPERCA) AFTER TRANSFER FROM POND TO INDUSTRIAL CONDITIONS

The work presents the results of studies to determine the optimal weight and stocking density of juvenile pikeperch during transfer from pond to industrial growing conditions. It is shown that larvae with an average weight of 116 mg are better adapted to transfer from ponds to pools for artificial feed than juveniles weighing 627 mg. In both cases, pikeperch fingerlings reached the weight of 1 g in 25-31 days, but pikeperch juveniles with a lower weight had higher survival rates (up to 69% vs. 20-40%), growth (average daily increase of 7,3-8,4% vs. 2,6%) and stocking density (up to 12,0 individuals per liter vs. 3,2 individuals per liter). The decrease of stocking density to 2,3 individuals per liter and its increase to 12,0 individuals per liter determined a faster growth of juveniles in the pools in the first weeks of rearing than at a stocking density of 8,6 individuals per liter, which indirectly indicates an earlier adaptation of juveniles to new conditions and the transition to an artificial diet. The survival rate of pikeperch was also higher with a reduced (2,3 individuals per liter) and increased (12,0 individuals per liter) growing density - 69 and 45%, respectively, against 37% with the stocking density of 8,6 individuals per liter. The results of pikeperch rearing at the stocking density of 12,0 individuals per liter were characterized by the highest fish productivity - 6 g/l, which is 31- 67% more than in other versions of the experiment. The use of live feed (Artemia Nauplius) allowed to improve the adaptive properties of pond juveniles during their transfer to industrial conditions and increase their survival rate to 37%, against 23% compared to a one-time transfer of pikeperch to mono diets from artificial feed (with the same stocking density of 8,6 individuals per liter). The physiological analysis of pikeperch fingerlings grown in a combined (pond and industrial) way indicates the similarity of morphophysiological, biochemical and hematological parameters with pond juveniles, which indicates both the usefulness of the fish itself and the growing conditions for the needs of pike perch juveniles, including feed and feeding regimes.

судак, Sander lucioperca, аквакультура, молодь, пруды, индустриальные технологии, бассейны, искусственный корм, pikeperch, Sander lucioperca, aquaculture, juveniles, ponds, industrial technologies, pools, artificial feed

1. Винберг Г. Г. Интенсивность обмена и пищевые потребности рыб. Минск: Белорусский гос. ун-т, 1956. 251 с.

2. Голодец Г. Г. Состав крови выращиваемой молоди осетра, леща и судака // Вопр. ихтиологии. 1954. Вып. 2. С. 114-119.

3. Королев А. Е. Энергетический баланс и рационы молоди судака и пеляди при их совместном выращивании в пруду // Сб. науч. тр. ГосНИОРХ. 1984. Т. 222. С. 2130.

4. Королев А. Е. Опыт применения искусственных кормов при подращивании личинок судака // Сб. науч. тр. ГосНИОРХ. 2005. Вып. 333. С. 287-316.

5. Лютиков А. А., Королев А. Е. Опыт перевода молоди судака (Sander lucioperca) с естественной пищи на искусственный корм // Вопр. рыболовства. 2019. Т. 20. №4. С. 468-481.

6. Остроумова И.Н, Костюничев В.В, Лютиков А. А. и др. Включение в стартовые корма для сиговых рыб (Соге§ош4ае) бактериальной биомассы и белковых гидролизатов / / Там же. 2018. Т. 19. №1. С. 82-98.

7. Хубенова Т, Зайков А., Кацаров Е., Терзинский Д. Влияние на гъстота на по-мудката върху нарастването и оцеляемостта на бялата риба (Sander lucioperca L.) през периода на преход от естествена храна към гранулиран фураж / / Селскопанска академия, Животновъдни науки, 2014. Т. 51. №4. С. 36-40.

8. Baer J, Zienert S., Wedekind H. Neue ertkenntnisse zur umstellung von natur auf trock-enfutter bei der aufzucht von zandern (Sander lucioperca L.) // Fischer und Teichwirt. 2001. V. 7. P. 243-244.

9. Bardnek V., Dvorak J., Kalenda V., Mares J., Zrustovd J., Spumy P. Comparison of two weaning methods of juvenile pikeperch Sander lucioperca from natural diet to commercial feed // The Conference Mendel Netz07. 2007. 45 p.

10. Hamza N., Mhetli M., Kestemont P. Effects of weaning age and diets on ontogeny of digestive activities and structures of pikeperch (Sander lucioperca) larvae // Fish Physiol Biochem. 2007. V. 33. P. 121-133.

11. Hubenova T., Zaikov A., Katsarov E., Terziyski D. Weaning of juvenile pikeperch (Sander lucioperca L.) from life food to artificial diet // Bulgarian J. Agricultural Science, 21 (Supplement 1), Agricultural Academy. 2015. P. 17-20.

12. Jankowska B., Zakes Z., Zmijewski T., Szczepkowski M. A comparison of selected quality features of the tissue and slaughter field of wild and cultivated pikeperch Sander lucioperca (L.) // Eur. Food Res. Technol. 2003. V. 217. P. 401-405.

13. Ljunggren L., Staffan F., Falk S., Linden B., Mendes J. Weaning of juvenile pikeperch, Stizostedion lucioperca L., and perch, Perca fluviatilis L., to formulated feed // Aquacul. Res. 2003. V. 34. P. 281-287.

14. Mani-Ponset L., Diaz J.P., Schlumberger O., Connes R. Development of yolk complex, liver and anterior intestine in pike-perch larvae, Stizostedion lucioperca (Percidae), according to the first diet during rearing // Aquat. Living. Resour. 1994. V. 7. P. 191-202

15. Molnar T., Hancz Cs., Molnar M., Horn P. The effects of diet and stocking density on the growth and behaviour of pond prereared pikeperch under intensive conditions // J. Appl. Ichthyol. 2004a. V. 20. P. 105-109.

16. Molnar T., Hancz Cs., BodisM., Muller T., Bercsenyi M., Horn P. The effect of initial stocking density on growth and survival of pike-perch fingerlings reared under intensive conditions // Aquacult. Internat. 2004 b. V. 12. P. 181-189.

17. Nyina-wamwiza L., XuX., Blanchard G., Kestemont P. Effect of dietary protein, lipid and carbo-hydrate ratio on growth, feed efficiency and body composition of pikeperch Sander lucioperca fingerlings // Aquacult. Res. 2005. V. 36. P. 486-492.

18. Ostaszewska T. Developmental changes of digestive system structures in pike-perch (Sander lucioperca L.) // Electronic journal of ichthyology. 2005. V. 2. P. 65-78.

19. Policar T., Stejskal V., Kristan J., Podhorec P., Svinger V., Blaha M. The effect of fish size and stocking density on the weaning success of pond-cultured pikeperch Sander lucioperca L. juveniles // Aquacult. Int. 2013. V. 21. P. 869-882.

20. Schulz C., Gunther S., Wirth M., Rennert B. Growth performance and body composition of pike perch (Sander lucioperca) fed varying formulated and natural diets // Aquacult. Int. 2006. V. 14. P. 577-586.

21. Szkudlarek M., Zak^s Z. The effect of stock density on the effectiveness of rearing pikeperch Sander lucioperca (L.) summer fry // Arch. Pol. Fish. 2002. V. 10. P. 115119.

22. Zak^s Z. Effect of stock density on the survival, cannibalism and growth of summer fry of European pikeperch (Stizostedion lucioperca L.) fed artificial diets in controlled conditions // Arch. Pol. Fish. 1997. V. 5. P. 305-311.

23. Zak^s Z. The effect of body size and water temperature on the results of intensive rearing of pike-perch, Stizostedion lucioperca (L.) fry under controlled conditions // Arch. Pol. Fish. 1999. V. 7. P. 187-199.

24. Zienert S. Ergebnisse bei der Aufzucht von Zandern // Fischer und Teichwirt. 2003. V. 8. P. 296-298.