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What does external morphometry tell us about stock discrimination of Sardina pilchardus stocks from Türkiye?

100%

Ozpicak M. , Saygin S.

Oceanological and Hydrobiological Studies

2024

tom Vol. 53, No. 3

299--309

The analysis of shape is a fundamental part of much biological research. Morphometrics, which incorporates concepts from biology, geometry, and statistics, is the study of the geometrical form of organisms. In addition, morphometric characteristics can be used to differentiate ‘phenotypic stocks’ as groups with similar growth, mortality, and reproductive rates. In this study, 25 morphometric characters were used to discriminate European pilchard (Sardina pilchardus) stocks from Türkiye. Intraspecific variation of the European pilchard was investigated based on morphometric characters. Samples were collected from the Aegean Sea (AS; N = 54), the Sea of Marmara (MS; N = 50) and the Mediterranean Sea (MEDS; N = 50) during the 2019 fishing season. Principal Component Analysis (PCA) and Canonical Discriminant Analysis (CDA) were used for stock discrimination of the European pilchard. Univariate statistics (ANOVA) showed that 24 of the 25 measurements differed significantly between samples to a varying degree ( p < 0.001). According to CDA, an overall classification success rate of 87.7% was achieved using 12 morphometric parameters. All samples were clearly separated from each other in the discriminant space, suggesting that there was no strong intermingling between populations. In addition, we would like to conclude that the morphological difference is not at the genetic level, and would like to emphasize the need for additional stock discrimination methods.

Enteric helminths of the shortfin squid Illex argentinus in San Matias Gulf [Argentina] as stock discriminants

63%

Gonzalez R. A. , Kroeck M. A.

Acta Parasitologica

2000

tom 45

nr 2

The parasitic fauna composition of the spring-spawning (SPR) and the summer-spawning (SSS) stocks of the shortfin squid Illex argentinus was studied in San Matías Gulf, Southwest Atlantic. Seven parasite taxa were identified: 3 cestodes (Scolex polymorphic, Scolex pleuronectis and Nybelinia lingualis), and 4 nematodes (Anisakis sp., Hysterothylacium sp., Ascarophis? sp. and Pseudoterranova? sp.). Based on the prevalence (P) and mean intensity (MI) S. polymorphic [cf. Prosobothrium sp.], S. pleuronectis (Onchobothriidae) and Anisakis were the main parasites of both stocks. P and MI of these parasites were higher in SPR than in SSS. Composition, P and MI of the enteric parasitic fauna found in the subpopulations of I. argentinus in the San Matías Gulf were different from those previously reported for the other stocks of the species that occur on the Argentine continental shelf. These results provide a substantial additional evidence for statement that the SPR and SSS stocks of I. argentinus from San Matías Gulf are biotopically isolated from the stocks that inhabit neighbouring areas of the Argentine continental shelf.