THE ASSESSMENT OF POLYODON SPATHULA GROWING TECHNOLOGY IN THEIR DIFFERENT AGES OF LIFE

Cristina Simeanu, D. Simeanu, A.C. Grădinaru

Abstract
    The aim of this study was to investigate two of Polyodon spathula growing technology in their different ages of life. Our research was performed in two different fish farms, each of them with a semi-intensive growing system. The Polyodon spathula aged at 3^rd summer was grown in BC 30 ha lake which has a production area of 30 hectares. There were placed 36500 fishes (carp - 15250; silver carp - 10500; white amur - 6300; bighead- 4200, and Polyodon spathula - 250) with a total weight of 12900 kg (average weights were: carp - 400 g, silver carp - 300 g, white amur - 300 g; bighead - 300 g, and Polyodon spathula - 2000 g), thus achieving a 1216.66 individuals/ha stocking density and a 430 kg/ha loading of tank. The Polyodon spathula aged at 4^th summer was grown in "Cal Alb" water accumulation, which has a production area of 135 hectares. There were placed 127025 fishes (carp - 53375; silver carp - 36750; white amur - 22000; bighead - 14700, and Polyodon spathula - 200), with a total weight of 57829.8 kilograms (average weights were: carp - 500 g, silver carp - 400 g, white amur - 450 g; bighead - 400 g, and Polyodon spathula - 3700 g), thus achieving a 940.92 individuals/ha stocking density and a 428.94 kg/ha loading of tank. The obtained results suggest a well-yielded Polyodon spathula using semi-intensive fish-farming systems.

Key words: Polyodon spathula, growing, polyculture