Abstract
This study evaluates the genetic diversity of different meagre broodstocks sampled in Greece. A multiplex of twelve microsatellite markers was used to genotype 946 fish from eleven stocks and batches used for broodstock selection, and the genetic data was used to calculate genetic population parameters as well as to investigate the genetic differentiation between stocks. The results from a relatedness analysis were used as the guiding lines for a fine-tuned and overall evaluation of the genetic distance between stocks, and the choice of candidate breeders from some of them. The approach implemented in this study uses well-established population genetics methods to evaluate the selection of breeder candidates in aquaculture commercial conditions utilizing a descriptive genetic data set based on microsatellite analyses, and to outline an efficient methodology for establishing the basis of new breeding schemes.
Highlights
Accepted: 4 December 2021Over 440 species of fish, invertebrates, and plants are farmed all over the world
The objectives of the current study were to assess the genetic diversity in different meagre breeders and offspring stocks based on microsatellite markers and use this information to illustrate their putative relatedness, inbreeding, and population structure
Aged more than 6 years old that were purchased from commercial companies, except stock G, which was composed of wild fish
Summary
Accepted: 4 December 2021Over 440 species of fish, invertebrates, and plants are farmed all over the world Higher genetic diversity implies more varieties and strains of organisms, which leads to greater adaptation possibilities in the challenging times of climate change and overfishing [1,2,3]. Marine fish species exhibit naturally high levels of genetic diversity, which is putatively the main driver of the rapid rate of genetic improvement, compared to plants or livestock [4,5,6,7]. Fecund species or r-strategists, like fish, exhibit higher polymorphism than species which produce low numbers of eggs and/or offspring of bigger body size, termed K-strategists, with the propagule size (the size of the stage that leaves its parents and disperses, egg or juvenile) being highly predictive of a species’ genetic diversity [8,9]. The success of genetic improvement is attributed partly to capturing the broad range of genetic diversity at the start of a breeding
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