STUDY REGARDING THE MORPH-PRODUCTIVE PERFORMANCES OF POLYODON SPATHULA STURGEON BREED
Cristina Simeanu, D. Simeanu
Rearing of Polyodon spathula sturgeons, which are the subject of the current study, was carried out in fisheries exploitation in which is applied a semi-intensive growing system. Rearing of Polyodon spathula sturgeons of first summer was realised in two stages: growing in channel basins type, and growing in a basin with large surface in poly-culture with carp and white amur. Having in view the fact that in the 10 ha basin were placed 18590 fishes with a total mass of 790.75 kg, we could appreciate that was realised a density at population of 1859 individuals/ha and a basin charge of 79.07 kg/ha. The total average of mass gain of the 1st summer paddlefishes was of 110.44 g, and daily average gain was of 3.68 g. Growing of Polyodon spathula sturgeons of second summer was carried out in dam, in this raising basin being introduced 125290 fishes (carp, silver carp, white amur, bighead and paddlefish) with a total mass of 11145 kg, so was realised a density at population of 3132.25 individuals/ha and a basin charge of 278.63 kg/ha. The recorded values for paddlefish with the age of two summers, shown a total average mass gain of 1620 g and a daily average gain of 12 g, gain which was with 126.08% better that those of the 1st summer paddlefish. The presented data are in according with the ones found in the literature, describing a very well rhythm of growing.
Key words: Polyodon spathula, grow, basin, poly-culture