Low, but significant, genetic differentiations were found between 18. Genetic diversity was high and homogeneous among years, with mean allele numbers ranging between 13.6 and 14.8 and observed heterozygosities (H o) between 0.7121 and 0.7331. In this context, we focused on a single population (Peyrefite, Banyuls-sur-mer, France) where 640 individuals were sampled in 2011, 2015, and 2018 and genotyped for 22 micro-satellite markers. This study documents the family structure of a pelagic spawner, Pinna nobilis, which is facing a major crisis that threatens its survival as most of its populations have been decimated by a parasite, Haplosporidium pinnae. Dispersal can be assessed through parentage analyses by estimating family structure and self-recruitment. Understanding dispersal patterns is a major focus for conservation biology as it influences local survival and resilience in case of local disturbance, particularly for sessile species. It is concluded that there is substantial potential for genetic improvement of economically important traits, suggesting that silver trevally is a promising species for selective breeding for enhanced growth. The implications of these findings are threefold: first, the best on‐growing conditions are in warmer months, where highest growth peaks can be achieved second, size‐ and family‐based selection can be used as early selection criterion if pedigree structure and inbreeding risks are closely monitored third, selection for body length results in concomitant increases in height and weight, traits of paramount importance for aquaculture. Genetic and phenotypic correlations between traits were high and positive, ranging from 0.57 to 0.94 and 0.50 to 1.00 respectively. Heritability values for growth traits ranged from 0.27 to 0.76. Growth patterns showed seasonal fluctuations (average increase across all traits of 27.3% in summer, and only 7% in winter) and strong inter‐family differences. Successful parentage assignment of 664 F1 individuals showed that the pedigree consisted of a complex mixture of full‐ and half‐sib individuals, with skewed reproductive success among parents, especially in females. We used whole‐genome information, coupled with image‐based phenotypic data collected over two years, to build the pedigree of the population, assess its genetic diversity, describe growth patterns of ten growth traits and estimate their genetic parameters. Here we investigated a population of 1,100 captive‐bred F1 silver trevally (Pseudocaranx georgianus), a promising new species for New Zealand aquaculture. It can also provide insights on potential gains for commercially important, yet complex, quantitative traits such as growth rate. Applying genomics to new breeding programmes can provide important information about pedigree structure and genetic diversity key parameters for a successful long‐term breeding programme. Thus, for the first time, we quantified helping for nonbreeding individuals in a marine fish, showed that behavioural patterns are rank-specific, and confirmed that individuals adjust both aggression and helping to their likelihood of inheriting a breeding position.Īquaculture is the fastest growing food production sector worldwide, yet industry has been slow to implement genomic techniques as routine tools. When we experimentally promoted individuals and controlled for group size, their behaviour became indistinguishable from that of individuals established in the higher rank. Despite low relatedness within groups, we found that lower-ranked individuals helped in both species. In both species, we found consistent differences in behaviour between ranks, with higher ranks performing both aggression and helping more often. percula, possibly due to a difference in ecological constraints. perideraion performed more aggression and less helping than A. perideraion groups and performed a removal experiment to determine whether behaviours were rank- or size-specific. We assessed behavioural frequencies for each rank in Amphiprion percula and A. Here we used two anemonefish species to test hypotheses of variation in helping and aggression with respect to social rank. Most empirical tests focus on systems with kin selection, whereas tests for groups in which individuals are unrelated are rare. Theoretical models suggest that higher-ranked individuals should increase aggression but should decrease helping unless the cost of helping decreases with higher rank. Many animal groups consist of dominance hierarchies.
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