First-generation genetic drift and inbreeding risk in hatchery stocks of the wreckfish Polyprion americanus

Genetic Divergence and Connectivity among Gene Pools of Polyprion americanus

“…Assuming expected fluctuations in range and number of alleles due to sample sizes, number of markers, and spatiotemporal variation of samples, a good congruence is observed on population genetic metrics in wreckfish from the Atlantic North between studies. For instance, current observations of thirty-five alleles from four microsatellites in one hundred and forty-five Azorean specimens is congruent with observation of forty-six alleles from six microsatellites in one hundred and eighteen specimens [1] or thirty-eight alleles from five microsatellites in forty specimens [22]. Congruence also exists with previous studies on wreckfish from wider Atlantic sampling efforts (e.g., [1], see its values subsequently within parenthesis) as for instance in the range of alleles per locus of 7-19 (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) and expected heterozygosity 0.333-0.830 (0.480-0.831) in four (six) microsatellites and four hundred and seventy-one (three hundred and thirty-seven) specimens from six (seven) samples collected in the North Atlantic and the Mediterranean Sea.…”

“…Two PCR duplexes were worked out to assess microsatellite variation in this species. Duplex I comprised microsatellites PamD1 and PamA5 [22]. Duplex II comprised mi-crosatellites Pam006 and Pam021 [1].…”

“…The disjoint allelic distributions and the divergence of the modal allele size of all microsatellites between regions, confirm the regional divergence within P. americanus already observed with mtDNA COI sequences. The heterozygote deficit of two microsatellites in the samples from Blake Plateau (Bpl), Azores Islands (Azo), and Brazil (Bra) can be due to interannual fluctuation of allele frequencies in Bpl (five years) and Azo (three years) as well as by the genetic divergence of Brazil (Bra) regarding the Atlantic North population where microsatellites where isolated from [1,22]. Despite the Mediterranean sample clustered to the Atlantic North pool using Bayesian computation, no firm conclusions can be made on its genetic status.…”

“…In the last three decades, there has been an increasing interest on the wreckfish fishery in both Atlantic coasts e.g., [19] that was motivated by its good flesh quality, large size, and high market price. The high growth rate exhibited during its pelagic stage coupled with the ease of its domestication, have also contributed to rising interest in its aquaculture development [20][21][22]. Such industrial interest was parallel to the high fishing pressure that finally brought about much concern on the sustainability of this fishery on both sides of the Atlantic e.g., [18].…”

Hatchery release programme modified the genetic diversity and population structure of wild Chinese sucker (Myxocyprinus asiaticus) in the upper Yangtze River

“…Hatchery‐produced juveniles, having come from limited numbers of broodstock, contain only a small portion of the genetic information from the whole population. This, combined with the small effective population size (Ne) of hatchery‐reared juveniles, can lead to inbreeding (Matusse et al, 2016). The positive inbreeding coefficients of the three hatchery populations (F IS = 0.201–0.392) suggested that inbreeding has already occurred in the hatchery stations, which is inconsistent with the previous studies (Cheng et al, 2016; Wu et al, 2016; Liu et al, 2018).…”