Abstract
We examined the distribution and genetic variability of the greater amberjack Seriola dumerili in the East China Sea (ECS) from the mitochondrial DNA (mtDNA) control region of young-of-the-year (YOY) individuals, which may reflect the genetic characteristics of the spawning population. In the years 2016 and 2017, a total of 165 YOY S. dumerili were collected from two different locations in the ECS: the southern part of the ECS, and western Japanese coast. The spawning period was estimated using otolith daily increments from a total of 67 larvae and juveniles collected in the ECS. Results from size and age distribution indicated that S. dumerili spawned near the shelf break region in the southern ECS from January to April. Phylogenetic analysis based on mtDNA sequence data showed no significant genetic differentiation among samples collected from different locations, implying S. dumerili in the ECS is mainly composed of one population. S. dumerili around the Japanese coast may be originated from the southern ECS.
Highlights
IntroductionThe greater amberjack Seriola dumerili (family Carangidae) is a marine pelagic species with circumglobal distribution from temperate to tropical waters (Taki et al 2005)
The greater amberjack Seriola dumerili is a marine pelagic species with circumglobal distribution from temperate to tropical waters (Taki et al 2005)
Previous studies in other waters reported that the majority of spawning of S. dumerili occurs between winter and summer: from February to April by hatching date analysis off Galveston, Texas in the U.S (Wells and Rooker 2004), from January to June with peak spawning in April and May in the South Atlantic (Sedberry et al 2006) and off the Atlantic coast in the Southeastern U.S (Harris et al 2007), in winter in the western Atlantic (Fahay 1975) and in June and July in the Mediterranean Sea (Raya and Sabatés 2015)
Summary
The greater amberjack Seriola dumerili (family Carangidae) is a marine pelagic species with circumglobal distribution from temperate to tropical waters (Taki et al 2005). Off the Atlantic coast in the southeastern U.S, females become mature at 1–5 years of age (51.4–82.6 cm in fork length) with 1.3 years being the mean age at which 50% of females are mature (25–47 million oocytes per female), indicating that they grow quickly, mature early, and exhibit high fecundity (Harris et al 2007). Since this species distributes all over the world, several different populations are recognized, two in the U.S coast and two in the eastern Asia. The results of Gold and Richardson (1998) supported the existence of these two subpopulations of S. dumerili in U.S waters based on variations in the restriction sites of mitochondrial (mt) DNA
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