Comparison of growth performance, feed utilization and morphology between homologous and heterologous juvenile Qihe crucian carp Carassius auratus

Deciphering male influence in gynogenetic Pengze crucian carp (Carassius auratus var. pengsenensis): insights from Nanopore sequencing of structural variations

“…One study found that at the end of the rearing experiment (180 days old) for homologous and heterologous offspring of Pengze Crucian carp, the average weight of heterologous offspring was 38.48% and 29.80% higher than that of homologous offspring, showing a significant growth advantage ( Zhou et al, 2020 ). Another study on the rearing of homologous and heterologous offspring of gynogenetic Qihe Crucian carp for 90 days found that the final body weight, weight gain, and specific growth rate of homologous offspring were significantly higher than those of heterologous offspring ( p < 0.01) ( Shi et al, 2022 ). These observations underscore the significant role of male-contributed genetic material in influencing offspring development.…”

“…Research indicates that incidental homologous recombination and gene conversion during oocyte maturation can prevent harmful mutation accumulation, thereby reducing the risk of extinction ( Wang et al, 2022 ). Notably, gynogenetic offspring are not exact clones of the mother, as evidenced by diverse offspring traits and the presence of male offspring in various sperm-stimulated combinations ( Shu et al, 2001 ; Zhao and Chen, 2003 ; Zhou et al, 2020 ; Ding et al, 2021 ; Shi et al, 2022 ). Studies have confirmed the inheritance of male genetic material in offspring ( Zhang et al, 1999 ; Zhao et al, 2004a ; Mao et al, 2020 ; Ding et al, 2021 ; Zhao et al, 2021 ), challenging previous assumptions about genetic uniformity.…”

Morphological characteristics of carp (Carassius Gibelio) in the conditions of pond fish farming in Uzbekistan

“…Meristic characters were calculated using conventional methods , and also measured plastic features according to the scheme of measurements of the family of cyprinids (Cyprinidae) (Figure 1) [4]. It was also identified landmarks on the surface of the body and made measurements according to the " truss protocol" [11][12] The measured traits were calculated in the form of indices, showing them as a percentage of the standard body length for each individual. The statistical parameters of one variable were determined using a computer.…”

“…In Uzbekistan in the late 1950s, in the fish farm Damashchi (now Damachi) (Syr Darya basin) and in the Kattakurgan reservoir (Zarafshan basin) was brought from the indicated fish farm Savino to grow silver carp. In connection with the rapid development of the polyculture of pond cyprinids (carp, Cyprinus carpio , silver carp, Hypophthalmichthys molitrix , bighead carp , H. nobilis , and grass carp, Ctenopharyngodon idella) in Uzbekistan since the 1960s, the cultivation of silver carp has not been developed, but it has taken root and occupied the niche of weed fish in carp polyculture [11,12].…”

“…Due to the rapid development of pond polyculture and the development of methods of factory reproduction and cultivation of fish stock from the Tashkent region, since the 1960s, silver carp have been annually resettled during regular numerous stockings of fish ponds and lakes, reservoirs with yearlings of cultivated cyprinids from the nurseries of the Tashkent region to all plain regions of Uzbekistan [4][5][6][7]9]. At the same time, weedy pond fish are also transported, which, among other things, cause noticeable negative effects on the fish productivity of ponds, competing with cultivated fish in the use of feed and natural food supply [11].…”