The contribution of stocked mud crabs Scylla paramamosain to commercial catches in Japan, estimated using a genetic stock identification technique

Obata, Yasuhiro; Imai, Hideyuki; Kitakado, Toshihide; Hamasaki, Katsuyuki; Kitada, Shuichi

doi:10.1016/j.fishres.2006.03.016

Cited by 36 publications

(49 citation statements)

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“…Urado Bay in Kochi Prefecture is the main area for S. paramamosain fisheries. The life span of this crab is from 1.5 to 2.5 years (Obata et al 2006). May and June are the spawning season, and in September hatched crabs grow to commercial size and recruit into the fishing ground.…”

Section: Estimating Mixing Rates and Drift 2067 Case Study: Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Imai et al (2002) used the mitochondrial DNA (mtDNA) D-loop region as a genetic tag and gave a point estimate for the mixing rate of juveniles released for a year. Obata et al (2006) obtained point estimates of mixing rates and their confidence intervals using the maximum-likelihood method.As mentioned above, haplotype or allele frequencies can vary due to genetic drift. Hatchery releases could be effective for depleted populations with limited recruitment.…”

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“…The natural population at release should actually act as a baseline. Obata et al (2006) conducted a simulation for sensitivity tests to quantify the magnitude of changes in estimates and standard errors of mixing rates for various values of genetic drift assumed to be known. However, the effect of the genetic drift on the estimate of the mixing rate has not been fully evaluated and the reliability of the classical method for such situations remains unknown.…”

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confidence: 99%

“…The commercial catch of this species has fallen since the mid-1970s from $12 tons and reached a record low of 1.6 tons in 1989. In the early 1980s, a stock enhancement program for this species started in Urado Bay, and the number of released juveniles has increased.To examine the efficacy of the release program for this species, an experiment using genetic tagging was conducted (Obata et al 2006). Samples were collected in Urado Bay around December in 1996-2002.…”

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Simultaneous Estimation of Mixing Rates and Genetic Drift Under Successive Sampling of Genetic Markers With Application to the Mud Crab (Scylla paramamosain) in Japan

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In stock enhancement programs, it is important to assess mixing rates of released individuals in stocks. For this purpose, genetic stock identification has been applied. The allele frequencies in a composite population are expressed as a mixture of the allele frequencies in the natural and released populations. The estimation of mixing rates is possible, under successive sampling from the composite population, on the basis of temporal changes in allele frequencies. The allele frequencies in the natural population may be estimated from those of the composite population in the preceding year. However, it should be noted that these frequencies can vary between generations due to genetic drift. In this article, we develop a new method for simultaneous estimation of mixing rates and genetic drift in a stock enhancement program. Numerical simulation shows that our procedure estimates the mixing rate with little bias. Although the genetic drift is underestimated when the amount of information is small, reduction of the bias is possible by analyzing multiple unlinked loci. The method was applied to real data on mud crab stocking, and the result showed a yearly variation in the mixing rate.I T is well known that many fisheries stocks have been reduced because of overfishing, habitat loss, and degradation. (Pauly et al. 2002). Some management procedures, such as setting a total allowable catch (TAC), are the usual practices for sustainable use of such fisheries stocks (e.g., Hilborn and Walters 1992). In addition to such management procedures, stock enhancement programs through release of hatchery-reared juveniles are used to supplement reduced natural stocks (Blaxter 2000;Svå sand et al. 2000;Leber et al. 2004;Kitada and Kishino 2006).In stock enhancement programs, the assessment of the contribution of the released population to the commercial catch is one of the important tasks . Also, it is necessary to monitor the genetic impact of release on a natural population. Evaluation of the mixing conditions of a released population into a natural population must then be carried out. However, if juveniles are too small to tag and/or the tag-shedding rate is significant, it is difficult to determine their mixing compositions through experiments with artificial tags. For such cases, there is the possibility of stock identification using genetic tags such as mtDNA haplotypes and microsatellite alleles (e.g., Leber et al. 2004).We now consider a fisheries stock of a random-mating population in a closed fishing ground. Here, we call this population a natural population. Suppose that in each year hatchery-reared juveniles are released before the fishing season. Then, a population after the release of the juveniles composes a composite population, which consists of two source populations, that is, the natural and supplemented populations. The composite population could in turn be naturally reproducing in the next year. We call it a natural population again.The haplotype or allele frequencies in a population in the fishing gro...

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Section: Estimating Mixing Rates and Drift 2067 Case Study: Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Simultaneous Estimation of Mixing Rates and Genetic Drift Under Successive Sampling of Genetic Markers With Application to the Mud Crab (Scylla paramamosain) in Japan

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Mud Crab Aquaculture

Paterson¹

2011

Recent Advances and New Species in Aquaculture

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Genetic differentiation and signatures of local adaptation revealed by RADseq for a highly dispersive mud crab Scylla olivacea (Herbst, 1796) in the Sulu Sea

Mendiola

Ravago-Gotanco

2021

Ecology and Evolution

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Connectivity of marine populations is shaped by complex interactions between biological and physical processes across the seascape. The influence of environmental features on the genetic structure of populations has key implications for the dynamics and persistence of populations, and an understanding of spatial scales and patterns of connectivity is crucial for management and conservation. This study employed a seascape genomics approach combining larval dispersal modeling and population genomic analysis using single nucleotide polymorphisms (SNPs) obtained from RADseq to examine environmental factors influencing patterns of genetic structure and connectivity for a highly dispersive mud crab Scylla olivacea (Herbst, 1796) in the Sulu Sea. Dispersal simulations reveal widespread but asymmetric larval dispersal influenced by persistent southward and westward surface circulation features in the Sulu Sea. Despite potential for widespread dispersal across the Sulu Sea, significant genetic differentiation was detected among eight populations based on 1,655 SNPs (FST = 0.0057, p < .001) and a subset of 1,643 putatively neutral SNP markers (FST = 0.0042, p < .001). Oceanography influences genetic structure, with redundancy analysis (RDA) indicating significant contribution of asymmetric ocean currents to neutral genetic variation (Radj2 = 0.133, p = .035). Genetic structure may also reflect demographic factors, with divergent populations characterized by low effective population sizes (Ne < 50). Pronounced latitudinal genetic structure was recovered for loci putatively under selection (FST = 0.2390, p < .001), significantly correlated with sea surface temperature variabilities during peak spawning months for S. olivacea (Radj2 = 0.692–0.763; p < .050), suggesting putative signatures of selection and local adaptation to thermal clines. While oceanography and dispersal ability likely shape patterns of gene flow and genetic structure of S. olivacea across the Sulu Sea, the impacts of genetic drift and natural selection influenced by sea surface temperature also appear as likely drivers of population genetic structure. This study contributes to the growing body of literature documenting population genetic structure and local adaptation for highly dispersive marine species, and provides information useful for spatial management of the fishery resource.

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The contribution of stocked mud crabs Scylla paramamosain to commercial catches in Japan, estimated using a genetic stock identification technique

Cited by 36 publications

References 14 publications

Simultaneous Estimation of Mixing Rates and Genetic Drift Under Successive Sampling of Genetic Markers With Application to the Mud Crab (Scylla paramamosain) in Japan

Simultaneous Estimation of Mixing Rates and Genetic Drift Under Successive Sampling of Genetic Markers With Application to the Mud Crab (Scylla paramamosain) in Japan

Mud Crab Aquaculture

Genetic differentiation and signatures of local adaptation revealed by RADseq for a highly dispersive mud crab Scylla olivacea (Herbst, 1796) in the Sulu Sea

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