Genetic Analysis of the Populations of Japanese Anchovy (Engraulidae: Engraulis japonicus) Using Microsatellite DNA
Resource
Marine Biotechnology 4 (5): 471-479
Journal
Marine Biotechnology
Journal Volume
4
Journal Issue
5
Pages
471-479
Date Issued
2002
Date
2002
Author(s)
Abstract
We analyzed the population structure of the Japanese anchovy (Engraulis japonicus), a small pelagic fish, using 6 microsatellite DNA loci. The anchovy is known to have 2 separate spawning populations, one near northeastern Taiwan in the Pacific Ocean and the other near southwestern Taiwan in the Taiwan Strait. The planktonic larvae then drifted north to the feeding grounds in the East China Sea to advance in their life history. Three populations of the anchovy were analyzed, including 2 temporal population from the north-eastern spawning ground (I-Lan 1999 and I-Lan 2000) and one population from the southwestern spawning ground (Peng-Hu 2000). The genetic variability of the 6 loci was high for all the populations. The average numbers of alleles per population ranged from 25.5 to 32.3, and the average observed heterozygosity ranged from 0.559 to 0.650. A significant population differentiation was found between geographic populations but not between the temporal populations. However, the level of geographic differentiation was weak, average FST 0.0088. The significant geographic population structure indicated that the populations of 2 spawning grounds belonged to separate stocks. Moreover, 16 of the 18 population-locus cases showed significant departure from Hardy-Weinberg equilibrium, implying that each spawning population in turn consisted of mixed native stocks. Finally, we posed 3 population models to be evaluated against the genetic data disclosed with the microsatellite markers.
Subjects
Engraulis; Fisheries management; Microsatellite; Stock
SDGs
Other Subjects
fish; genetic analysis; genetic variation; population structure; Pacific Ocean; Anchoa; Engraulidae; Engraulis; Engraulis japonicus; transposons
Type
journal article
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