Out-of-season spawning of cultured pikeperch [Sander lucioperca (L.)]

Abstract

The aim of this study was to determine the effectiveness of out‐of‐season spawning of cultivated pikeperch (fish that were reared from the larval stage in re‐circulating systems and fed commercial feed exclusively) stimulated hormonally with human chorionic gonadotropin (hCG). The impact of fish age (2+ and 3+) and hormone dosage [200 or 400 IU hCG kg−1 body weight (BW)] on spawning was analysed and expressed as the share of stripped females, commercial fecundity (% BW) and survival of embryos until the eyed‐egg stage (EES index). The possibility of utilizing changes in female pikeperch body weight (CBW index) that are observed following hormone injections as an additional indicator for determining maturity was also investigated. The age and hormone dosage were not noted to have a significant impact on the number of stripped females (≥80% on all groups), the latency period (90–100 h), commercial fecundity (11.3–13.3% BW) or the values of the EES index (61–73%; P>0.05). The mean value of EES from the 3+ age group females was higher than that in the 2+ females, and the interaction between the tested factors (fish age and hormone dosage) wasstatistically significant (P<0.05). In the fish from the control group (injected with a 0.9% NaCl solution), no progress was noted in the maturation of oocytes and no eggs were obtained from any female. It was noted that these females lost BW over the course of the subsequent 24 h of the measurements (P<0.05). In the groups of females that were stimulated hormonally, the opposite phenomenon was observed; in these groups, the CBW index increased significantly between 48 and 96 h following hormone injection. The value of the CBW index was not noted to have been statistically significantly determined by either hormone dose or fish age (P>0.05). The regression equations that described the dependence between CBW and the oocyte maturity stage were highly significant statistically, and the determination coefficient R2 assumed a value of 0.76. The most significant increase in BW was related to the oocytes achieving maturity stage III. The BW of pikeperch females with oocytes in this stage was 103% higher than the initial BW. This might be a valuable and useful tool for determining maturity in females of this fish species.

Reproductive performance of indoor-reared pikeperch (Sander lucioperca) females after wintering in outdoor earthen ponds

“…). Induction of gonadal maturation and spawning of RRF has been reported to be feasible (Zakęś ; Zakęś et al . ), but it is a method that has not been well explored.…”

Impact of di-n-butyl phthalate on reproductive system development in European pikeperch (Sander lucioperca)

“…The experimental material comprised juvenile European pikeperch obtained through artificial, out-of-season reproduction (Zakęś 2007). A sample of 240 fish with body weights from 0.80 to 2.00 g (Table 1) were chosen at random, and 40 fish were stocked into each of six circulation tanks with working volumes of 28 dm , respectively.…”

Conventional and molecular cytogenetics of the pikeperch (Sander luciopercaL.)

“…However, progress towards developing an efficient method in the pikeperch artificial reproduction and rearing have been observed. Hormonal and photoperiod-induced out-of-season maturation and spawning of the wild and domesticated pikeperch seem to be already elaborated (Zakęś 2007;Sarameh, Falahatkar, Takami & Efatpanah 2012;Żarski, Kucharczyk, Targoń ska, Paliń ska, Kupren, Fontaine & Kestemont 2012). Induction of chromosome set manipulations like triploidization and gynogenesis would be a step forward in production of valuable material for the pikeperch aquaculture (Rougeot, Minet, Prignon, Vanderplasschen, Detry, Pastoret & Melard 2003).…”