Induction of Out-of-Season
Spawning of Pikeperch, Sander Lucioperca (L.)
Z. Zakes, M.
Szczepkowski-2004
Aquaculture International, 12(1):
11-18
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.
(The Stanisław
Sakowicz Inland Fisheries Institute, 10-719 Olsztyn, Oczapowskiego 10,
Poland, Tel: +48-89-524-01-71; +48-89-524-05-05, e-mail: zakes@infish.com.pl)