Pedigree analysis of recaptured fish in the stock enhancement program of spotted halibut Verasper variegatus |
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Authors: | María Del Mar Ortega-Villaizán Romo Masato Aritaki Nobuhiko Taniguchi |
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Institution: | Laboratory of Population Genetics Informatics, Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai 981-8555 and;National Center for Stock Enhancement, Miyako Station, Miyako, Iwate 027-0097, Japan |
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Abstract: | ABSTRACT: Spotted halibut Verasper variegatus hatchery juveniles produced in 2002 were genotyped using three microsatellite DNA markers (msDNA) and then released into natural waters. Subsequently, recaptured individuals were examined using msDNA. In order to evaluate the effectiveness of the stock enhancement program, from the genetic point of view, a pairwise F ST test was implemented to estimate the genetic divergence between the wild captive broodstock, the hatchery offspring and the recaptured samples. The analysis showed significant differentiation between the broodstock and recaptured samples. Pedigree determination using msDNA was used to calculate the effective population size of the recaptured stock, which was found to be very low ( N e ≈ 8). Equal family survivability was observed between the two recaptured stocks, but not between the released and recaptured stock. The number of identified families was higher and more equalized in the hatchery offspring compared to the recaptured samples, where the number of families declined. This fact was caused by an unequal family survivability just before or just after release. Separately, the number of contributing parents to the hatchery offspring was lower than the broodstock census number. Consequently, these two facts caused the genetic divergence of the recaptured stock from the broodstock. |
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Keywords: | effective population size hatchery stock pedigree tracing recaptured fish spotted halibut stock enhancement survival rate |
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