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Abstract

Reproduction characteristics and broodstock mortality were compared in farmed perch (FP) and wild perch (WP) under controlled conditions. Thirty-six farmed females (FF) (92.3%) and 30 wild females (WF) (76.9%) spawned during the reproductive season. Absolute fecundity in FF was 18 660±6 809 eggs per female compared to 31,081±3,276 eggs per female in WF. Similar differences were observed in relative fecundity (FF 112,470±13,370 eggs per kg body weight and WF 137,054±18,513 eggs per kg body weight). No significant differences in fertilization rate (FR), larval resistance (LR) and larval total length (LTL) were found (FR -91.9±6.9% and 90.5±6%; LR -51.1±25.2% and 53.5±26.2%; LTL -5.88±0.55 mm and 5.82±0.51 mm in FP and WP, respectively). The highest differences were found in hatching rates of 27.9±9.3% in FP and 62.0±16.0% in WP. No mortalities were observed during the reproductive season, but post-spawning mortality among WP was 92.5±2.5% of females compared with 21.5±12.5% in FP.

Genetic and aquaculture performance differentiation among wild allopatric populations of European perch (Percidae, Perca fluviatilis)

“…After temperature acclimatization, 150 randomly chosen eggs per population were sampled to assess fertilization rate according to (Křišťan et al, 2012). At the eyed stage, the inner diameter, not including the gelatinous coat, of 100 randomly sampled eggs was measured following Żarski et al (2011) using a Leica Z6-APO scope (Leica Microsystems, Switzerland).…”

Changes in ide Leuciscus idus (L.) females’ reproductive parameters after stimulation with carp pituitary homogenate (CPH) and Ovopel: the effect of domestication?

“…Křišt'an et al (2012) report the same phenomenon for perch. Spawn obtained from wild broodstocks is usually characterized by higher survival rate (Krejszeff et al 2008(Krejszeff et al , 2010Kujawa et al 2011;Targońska et al 2011;Křišt'an et al 2012). In our experiment, the highest differences in reproductive parameters (both in '?'…”

“…Broodstock strains grown and matured in different environmental conditions or stimulated with different hormonal preparations may significantly differ in reproduction effectiveness and reproductive parameters between Brooks et al (1997); Shimada et al (2007); Krejszeff et al (2009); Kujawa et al (2011);Křišt'an et al (2012). This is also true even in the case of species that are a long-term object of aquaculture and cultivation such as carp (Brzuska 2000).…”

Breeding of a Wild Population of South Pacific Bonito Sarda chiliensis chiliensis (Cuvier 1832) Broodstock under Laboratory Conditions in Pisagua, Northern Chile

“…Wang et al [ 46 ] reported a high concentration of cortisol and low concentration of lysozyme for Perca fluviatilis , caused by possible adverse conditions present in the rearing tank that produces stress in the fish. It is also worth proposing that post-spawning mortality occurs in several other fish species such as Perca fluviatilis [ 47 ] and Psetta maxima [ 48 ], although in our research, spontaneous spawning occurred three months after the last registered mortality.…”