Abstract
Pikeperch were induced to spawn 3 months prior to the natural spawning period through photothermal and hormonal stimulation. Females (five specimens in each group) were stimulated with injection of human chorionic gonadotropin (hCG) once (200 IU kg−1), twice (200 IU kg−1, second dose after 48 h–400 IU kg−1) or three times (200 IU kg−1, after 24 h–200 IU kg−1 and after another 24 h–200 IU kg−1). The control group was injected once with 0.9% NaCl. The males were stimulated with a single hormone dose of 200 IU kg−1. Eggs were obtained from all the hormonally treated fish. None of the control group females, which were only stimulated photothermally, ovulated any eggs. The time of ovulation was 66–71 h following the first injection, and the eggs viability until the eyed stage (from 71.5 to 77.5%) did not depend on the number of hormone doses (P > 0.05). The out-of-season spawning method described in this paper could be used to provide pikeperch larvae for intensive culture systems (recirculating water systems) before natural spawning season and to produce larger-sized pikeperch fingerlings for stocking.
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Zakes, Z., Szczepkowski, M. Induction of Out-of-Season Spawning of Pikeperch, Sander Lucioperca (L.). Aquaculture International 12, 11–18 (2004). https://doi.org/10.1023/B:AQUI.0000017183.40691.7d
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DOI: https://doi.org/10.1023/B:AQUI.0000017183.40691.7d