ASPECTS REGARDING THE CONTROLLED REPRODUCTION OF PIKEPERCH (SANDER LUCIOPERCA LINNE, 1758) IN INDUSTRIAL AQUACULTURE SYSTEMS.

Pike-perch is a very active predatory fish in its natural environment, but extremely sensitive in aquaculture units. Usually, the frequent manipulations may cause many losses in the fish farms, especially during artificial or controlled reproduction. This paper presents the obtained results at S.C.D.P. Nucet, in 2018-2020 period, regarding the pikeperch controlled reproduction in ponds units. The fish were divided into three experimental variants, in triplicate: V1- controlled reproduction, without hormonal induction, V2-controlled reproduction with hormonal induction (carp pituitary), V3 -controlled reproduction, with hormonal induction (synthetic analogue hormone-Nerestin 5A). Each variant used 5 females and 5 males with an average body weight of 2 kg/fish. The best technological indicators were registered in V3 variant, which was based on hormonal induction with Nerestin 5A hormone (88-92% eggs fertilization rate, 71-78% eggs hatching rate, about 2.7 million 7-8 days larvae). The smallest brood stock losses were recorded in V1 variant (without hormonal induction). [ABSTRACT FROM AUTHOR]