Genetic consequences of pond production of a pikeperch (Sander luciopercaL.) stock with natural origin: the effects of changed selection pressure and reduced population size

Abstract

The pikeperch (Sander lucioperca L.) possesses great potential for diversifying European aquaculture. However, studies on the genetic risk of stocking natural waters with farmed individuals of this species have been limited. Even the effect of pond culture on the genetic composition of stocks with natural-origin has not yet been determined. Our study aimed to compare the genetic variability of a wild living pikeperch population, a pond cultured broodstock (originating from the wild population) and its offspring generation. We also aimed to detect the potential signs of selection using three different methods. By analyzing the molecular data with 14 microsatellite markers, we illustrated that the impact of pond culture on the genetic diversity of fish stocks is similar to hatchery rearing due to its diversity reducing effect caused by using lower effective population sizes. Although the heterozygosity was similar in all populations (Ho = 0.68–0.71), the average number of alleles and allelic richness were significantly lower in the pond cultured stocks (NA = 7.5 and 6; AR = 7.5 and 5.9) compared to the wild population (NA = 11.00, AR = 10.47). Despite the semi-natural conditions of the present study, we detected changing selection pressure in one of the 14 microsatellite markers.

Genetic Structure and Diversity of Native Tench (Tinca tinca L. 1758) Populations in Hungary—Establishment of Basic Knowledge Base for a Breeding Program

“…The genetic variability found in nature is the existing basis of all future selective breeding programs. Artificial selection and selective breeding may have a negative effect on genetic diversity and effective population sizes [61]. When the aim to generate significant genetic gain is coupled with limited facilities and with the need to breed exclusively genetically and phenotypically superior individuals can cause the creation of small populations together with high probability of genetic drift and inbreeding.…”

The expression of myogenic gene markers during the embryo‐larval‐transition in Pikeperch ( Sander lucioperca )

“…We chose specimens from a wild population, which were reared under natural as possible conditions. While this involves unsteady environmental conditions (like water temperature), it also allows observing specimens free or otherwise present cultivation or breeding effects (Berg et al, 1990; Mas‐Muñoz et al, 2013; Molnár et al, 2020), which possibly are present in aquaculture specimens.…”

A comprehensive genome survey study unveils the genomic characteristics and phylogenetic evolution of fishes in the Uranoscopidae family

“…However, it is noteworthy that U. tosae, U. japonicus, and U. oligolepis exhibit relatively high heterozygosity rates (>0.68%), potentially affecting the following high-quality genome construction. The elevated heterozygosity also suggests potentially larger population sizes for these three species in their natural environments (Rougemont et al, 2019;Molnaŕ et al, 2020). As an important index for sequencing, the GC content can affect the randomness of the genome (Xu et al, 2014).The average GC content for Trichiuridae species ranged from 42.14% to 43.53% in this study, which was mid-GC content and in the normal range (Zhou et al, 2013;Chen et al, 2020).…”