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Genetic considerations on the introduction of farmed fish in marine protected areas: The case of study of white seabream restocking in the Gulf of Castellammare (Southern Tyrrhenian Sea)
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Orientador(es)
Resumo(s)
Human exploitation has drastically reduced the abundance and distribution of several marine fish and invertebrate
populations through overfishing and habitat destruction. Restocking can potentially mitigate these
impacts and help to reconstitute depleted stocks but genetic repercussions must be considered. In the present
study, the degree of genetic similarity between white seabream (Diplodus sargus Linnaeus 1758) individuals
reared for restocking purposes and the receiving population in the Gulf of Castellammare fishery reserve
(Sicily, Italy) was assessed using microsatellites. We also inferred the spatial pattern of the genetic structure
of D. sargus and connectivity along Sicilian coasts. The farmed population showed significant heterozygosity
deficiency in 6 loci and an important reduction in the number of alleles, which could indicate an incipient inbreeding.
Both the farmed population and the target one for restocking (Castellammare fishery reserve),
showed high and significant values of genetic differentiation due to different allele frequencies, number of
privative alleles and total number of alleles. These findings indicate a low degree of genetic similarity between
both populations, therefore this restocking initiative is not advisable. The genetic connectivity pattern,
highly consistent with oceanographic currents, identified two distinct metapopulations of white seabream
around Sicily. Thus it is recommended to utilize broods from the same metapopulation for restocking
purposes to provide a better genetic match to the wild populations.
Descrição
Palavras-chave
Introgression Biodiversity Fisheries Management Fishery Reserve Microsatellites Sparidae
Contexto Educativo
Citação
Editora
Elsevier