engleski

Combination of molecular and morphological characteristics to assess different origins

The Gilthead seabream, Sparus aurata L, is one of the most important species in the Mediterranean for the aquaculture and fisheries sector, yet there is a lack of evidence of the magnitude and geographic scale of interbreeding as a repercussion from individual escape events. In order to assess population characteristic, combination of molecular and morphological characteristics was used to investigate wild and farmed gilthead seabream origin from the Adriatic coast and to assess the impact of genetic introgression of escapees to the wild seabream populations. Morphological traits were quantified by the application of homologous anatomical points of geometric morphometry (Talijančić et al., 2018) and are matched with multilocus genotypes (Žužul et al., in press) aiming to classify success of individuals with respect to their origin using Monte-Carlo simulations and cross validation with Koverlapping method implemented in the AssignPOP package (v.1.3-0) R software (Chen et al., 2018). Evaluated baseline data collected from source populations resulted in higher assignment accuracy and performed assignment test on unknown individuals predicted populations and membership probability. Since escaped evenest occurred regular, it is necessary to develop proper tools to identify escapees and to establish protocols for rapid and successful determination. The results of this study will provide the basis for forming good management practices of escapes scenarios.

origin traceability, seabream, escapees

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