EJPAU 2004. Targońska-Dietrich K. , Zielazny T. , Kucharczyk ...ED IDE (< I> LEUCISCUS IDUS< /I> L.) UNDER CONTROLLED CONDITIONS Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI. 2004 Volume 7 Issue 2 Topic: Fisheries E L E C TRON IC J OURN A L OF POL I S H A GRI C UL TURA L UN I VE RS I TI E S Copyright © Wydawnictwo Akademii Rolniczej we Wroclawiu, ISSN 1505-0297 Targońska-Dietrich K. , Zielazny T. , Kucharczyk D. , Mamcarz A. , Kujawa R. 2004. OUT-OF-SEASON SPAWNING OF CULTURED IDE (LEUCISCUS IDUS L.) UNDER CONTROLLED CONDITIONS, EJPAU 7(2), #02. Available Online: http://www.ejpau.media.pl/volume7/issue2/fisheries/art-02.html OUT-OF-SEASON SPAWNING OF CULTURED IDE (LEUCISCUS IDUS L.) UNDER CONTROLLED CONDITIONS Katarzyna Targońska-Dietrich, Tomasz Zielazny, Dariusz Kucharczyk, Andrzej Mamcarz, Roman Kujawa ABSTRACT The comparison of out-off-season spawning of two cultured ide stock were examined. The obtained results show, that is possible to reproduced ide a few months before their natural spawning season. Generally, the percentage of spermiation and ovulation was very high, as well as spawners survival. The biological quality of the gametes was higher in stock cultured at ponds, than from fish cultured under controlled conditions. One ide females from cultured stock under controlled conditions ovulated without hormonal stimulation (control group). The quality of oocytes collected from this fish was much lower than from hormonally stimulated fish. Key words: artificial spawning, Leuciscus idus, reproduction, out-off-season spawning.. INTRODUCTION The development of the civilization has contributed to modification of the water environment by building-up rivers as well as bringing significant amounts of contaminants into them. This state of matter has caused some serious inconvenience for existence and reproduction of the fish. Research conducted recently in polish rivers show changes in the fish species fauna. It applies especially to rheophylic fish [20, 25]. Ide (Leuciscus idus) is one of the species whose number has been subjected to systematic limitation for many years [1]. Experiments on reproduction of this species were made during the spawning season [2, 4, 5, 12]; there have also been some reports on obtaining gametes off the spawning season [11, 12, 13]. These experiments, however, were made on fish captured in natural environment. One of the biggest obstacles in artificial spawning of rheophylic cyprinid fish is getting the spawners [15]. There is very difficult to catch both sexes at the same area shortly before the spawning. Males reach the spawning area before females thus it would be more appropriate to catch the fish at the spawning areas or earlier, on the feeding territories [11]. These kinds of problems are solved http://www.ejpau.media.pl/volume7/issue2/fisheries/art-02.html (1 z 7) [2012-10-02 13:47:30]