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Electrophoretic analysis of protein variation in two Spanish populations of the European seabass, Dicentrarchus labrax L. (Pisces, Moronidae)
Author(s) -
MARTÍNEZ G.,
McEWEN I.,
McANDREW B. J.,
ALVAREZ M. C.
Publication year - 1991
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1991.tb00757.x
Subject(s) - dicentrarchus , biology , hatchery , population , zoology , genetic distance , genetic variation , sea bass , reproductive isolation , genetics , fishery , gene , fish <actinopterygii> , demography , sociology
. One hundred specimens of the European seabass. Dicentrarchus labrax L., from a natural population (Cádiz, Spain) were analysed by starch gel electrophoresis for 23 enzymes; 49 loci were identified, of which five were polymorphic (ADH*, AAT‐3*, EST‐.3*, MEP‐1* and SOD‐2*) P = 10·2% and HQ = 1·8%. Twenty specimens from a hatchery at Tinamenor in northern Spain (Fl progeny from wild) were analysed for 28 different enzymes. A total of 61 loci were identified of which 4 were polymorphic (LDH‐1*, LDH‐2*, MEP‐1*, and XDH‐2*) P = 6·6%,Ho= 1·5%. A total of 31 enzyme systems and 79 different loci were analysed in the two populations. The results suggest that the Cádiz and Tinamenor stocks are reproductively isolated and show a level of stock differentiation not previously known in populations of this species. An estimate of genetic distance based on the 31 loci compared in both populations gave a value of D=0·012+0·018 and a genetic similarity of I=0·988. The implications of these results for fisheries and aquaculture are briefly discussed.