Allozymic and morphometric evidence for two stocks of the European anchovy Engraulis encrasicolus in Adriatic waters

Bembo, D. G.; Carvalho, Gary R.; Cingolani, Nando; Arneri, Enrico; Giannetti, G.; Pitcher, Tony J.

doi:10.1007/bf00354635

Cited by 69 publications

(89 citation statements)

References 28 publications

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“…2a), as a result of mechanisms that limit the gene exchange between the Adriatic and the other Mediterranean populations. According to Astraldi et al (1999) the Adriatic Sea is a semi-closed area with peculiar oceanographic characteristics, which seem to influence the distribution of allelic frequencies in other fish species, like the European anchovy Engraulis encrasicolus (Bembo et al, 1996) and the common sole Solea vulgaris (Kotoulas et al, 1995), in which genetic differences were found. Nevertheless, the intraspecific genetic substructure of D. vulgaris, was supported by the significant heterogeneity among each pair of samples (as calculated by the pairwise Fisher's exact test) (data not showed), showing the heterogeneity in all the samples analysed.…”

Section: Discussionmentioning

confidence: 99%

The stock genetic structure of two Sparidae species, Diplodus vulgaris and Lithognathus mormyrus, in the Mediterranean Sea

et al. 2003

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Polyacrilamide gel electrophoresis (PAGE) of allozymes was used to investigate the intraspecies genetic variation and the genetic stock structure of Diplodus vulgaris and Lithognathus mormyrus captured from eight localities in the Mediterranean Sea. Twenty-two and 20 putative enzyme-coding loci were examined, respectively, in D. vulgaris and L. mormyrus. Polymorphic loci at the 95% level were used to assess the allozyme variability in D. vulgaris (AAT-2 * , EST-1 * , GLDH * , PEPB-2 * , PGI-2 * , PGM * , SDH * ) and L. mormyrus (AAT-2 * , EST-1 * , GLDH * , MDH-2 * , PGI-2 * , PGM * ). The proportion of polymorphic loci in both species ranged from 0.31 (D. vulgaris) to 0.30 (L. mormyrus), and the observed and expected mean heterozygosity varied between 0.082 and 0.093 (D. vulgaris) and between 0.069 and 0.072 (L. mormyrus). The mean value of observed heterozygosity in D. vulgaris showed a deficit of heterozygosites, thereby indicating a Wahlund effect in the samples examined. Significant genetic differentiation (mean value of θ = 0.013, p < 0.005) was found in D. vulgaris indicating an intraspecific genetic substructure among the samples examined, whereas the mean value of θ = 0.001, p > 0.05 found in L. mormyrus showed a high degree of genetic homogeneity. The results showed the presence of distinct subpopulations of D. vulgaris among the sampled sites, and suggested that analysis of allozymes may provide important information on the genetic stock structure of these two sparids to ensure sustainable management of these species.

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Section: Discussionmentioning

confidence: 99%

The stock genetic structure of two Sparidae species, Diplodus vulgaris and Lithognathus mormyrus, in the Mediterranean Sea

et al. 2003

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“…Morphometric and genetic techniques have been applied to the problem of stock definition and identification of anchovy (Bembo et al, 1995;Bembo et al, 1996aBembo et al, , 1996bPla et al, 1996;Tudela, 1999;Tudela et al, 1999), hake (Roldán et al, 1998), Norway lobster (Castro et al, 1998;Maltagliati et al, 1998) and red shrimp (Sardà et al, 1998), but the impact of these studies have been weak because they were not conclusive.…”

Section: Stocksmentioning

confidence: 99%

Fish stock assessments in the Mediterranean: state of the art

Lleonart¹,

Maynou²

2003

Sci. Mar.

310

245

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SUMMARY: The Mediterranean fisheries are characterised by fragmented fleets, usually composed by relatively small vessels, use of a large number of landing sites, multi-species catches and low CPUEs. Fish are commercialised mainly fresh and the prices are relatively high. These factors make it difficult and expensive to get extensive and reliable data time series and to get biological samples. Most of the fish caught in the Mediterranean are the recruits (0-1 year old) of the main target species. Since the recruitment is much more uncertain than the abundance of the adult stages, the assessments are also more uncertain. Furthermore, no TAC or adaptive management is in place, so the administrations do not require monitoring in order to manage the fisheries. The continental shelf is narrow (with some exceptions) and there are few stocks shared between two or more countries. Consequently, the international management structures have not been sufficiently enforced, and until recently no regular assessments were made by international working groups. These characteristics have led to a situation in which most of the assessments have been done in the framework of scientific projects, and therefore do not have continuity in time. The results of these assessments have rarely been incorporated in management.

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“…Different methods are used for identification but phenotype based on morphometric and meristic is considered as earliest and authentic methods for the identification of fish species in fish biology to measure discreteness and relationships among various taxonomic categories. There are many well documented morphometric studies which provide evidence for stock discreteness (Avsar, 1994;Haddon and Willis, 1995;Bembo et al, 1996;Anene, 1999;Turan, 1999;Zafar et al, 2002;Barriga-Sosa et al, 2004;Doherty and McCarthy, 2004;Naesje et al, 2004). Morphometric is the external measurements of an organism, while meristic counts means serial counts of body elements (Talwar and Jhingran, 1992).…”

Section: Introductionmentioning

confidence: 99%

Phenotype and genotype differentiation between flathead grey mullet [Mugil cephalus] and thinlip grey mullet [Liza ramada (Pisces: Mugilidae)]

El-Zaeem¹

2011

Afr. J. Biotechnol.

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This study aimed to study the phenotype and genotype differentiation and to compare the amount of differences in phenotype based on morphometric character indices and meristic counts with the amount of differences in genotype based on random amplified polymorphic DNA (RAPD) fingerprinting between two Mugilidae, Flathead grey mullet (Mugil cephalus) and Thinlip grey mullet (Liza ramada). The results showed that there were significant differences in most of the morphometric character indices but no significant differences were detected in most of the meristic counts between M. cephalus and L. ramada. In addition, the euclidean distance between M. cephalus and L. ramada using hierarchical cluster analysis of quantitative phenotype based on morphometric character indices and meristic counts and condition factor was (0.421). Genotype analysis based on RAPD fingerprint showed highly genetic dissimilarity (0.437) between M. cephalus and L. ramada. These results confirmed that the amount of differences in genotype reflected the same amount of differences in phenotype between M. cephalus and L. ramada. Therefore, either phenotype analysis can be use based on a large number of morphometric character indices and meristic counts or genotype analysis based on RAPD fingerprinting to discriminate M. cephalus and L. ramada with the same results.

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Allozymic and morphometric evidence for two stocks of the European anchovy Engraulis encrasicolus in Adriatic waters

Cited by 69 publications

References 28 publications

The stock genetic structure of two Sparidae species, Diplodus vulgaris and Lithognathus mormyrus, in the Mediterranean Sea

The stock genetic structure of two Sparidae species, Diplodus vulgaris and Lithognathus mormyrus, in the Mediterranean Sea

Fish stock assessments in the Mediterranean: state of the art

Phenotype and genotype differentiation between flathead grey mullet [Mugil cephalus] and thinlip grey mullet [Liza ramada (Pisces: Mugilidae)]

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