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Parentage determination of black sea bream(acanthopagrus schlegelii)for stock enhancement:effectiveness and loss of genetic variation

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Acta Oceanologica Sinica 2021年第6期40卷 41-49页

作者： Binbin Shan Yan Liu Na Song Changping Yang Shengnan Liu Tianxiang Gao Dianrong Sun Key Laboratory of South China Sea Fishery Resources Exploitation&Utilization Ministry of Agriculture Rural AffairsGuangzhou 510300China Guangdong Provincial Key Laboratory of Fishery Ecology and Environment Guangzhou 510300China Scientific Observation and Research Field Station of Pearl River Estuary Ecosystem of Guangdong Province Guangzhou 510300China South China Sea Fisheries Research Institute Chinese Academy of Fisheries SciencesGuangzhou 510300China Fishery College Ocean University of ChinaQingdao 266003China Fishery College Zhejiang Ocean UniversityZhoushan 316022China

The stock enhancement programs for black sea bream acanthopagrus schlegelii have been conducted in China for a ***,little information has been reported concerning the effectiveness and genetic effect of black sea bream stock *** order to detect the contribution of released individuals in Zhujiang River Estuary(ZRE)and Daya Bay(DB),six microsatellite markers were used to identify the hatchery-released *** addition,this pedigree of hatchery populations(broodfish and hatchery-released offspring)was traced to detect the number of effective parents(N_(e)),the inbreeding coefficient and the decrease of genetic variability in the *** pedigree reconstruction showed that at least 69(out of 93)broodfish had *** estimated N_(e) was 54.8,consequently the inbreeding coefficient was 0.91%.The genetic diversity of hatchery-released offspring was lower than that in that of broodfish(heterozygosity alleles,0.727-0.774),some alleles(number of alleles,61-69)and genetic variance were lost during *** was observed that wild samples had higher levels of genetic diversity compared with hatchery populations as well as recaptured samples in releasing area.A total of 128 hatchery-released black sea bream were identified among 487 recaptured samples in ZRE,while a total of 15 samples were identified among 96 samples in *** summary,there was a high survival of released fish.N_(e)vertheless,the results provided evidence to consider a loss of genetic variation in hatcheryreleased stock and a negative genetic effect of the stock enhancement.

关键词： acanthopagrus schlegelii stock enhancement effectiveness microsatellite maker genetic effect pedigree of hatchery populations

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饥饿后再投喂对黑鲷幼鱼补偿生长影响研究

饥饿后再投喂对黑鲷幼鱼补偿生长影响研究

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作者： Bergo OWARI NGANDZALI 浙江大学

学位级别：硕士

Effects of single phase of food deprivation and refeeding on metabolic parameters were studies in juvenile black seam bream, weighing 15.79±0.21 g. Fish were divided into four different starvation periods:5,10,15 and 20 days designated as D5,D10, D15, and *** starvation periods fish were fed to satiation twice a day until the end of the experiment. The duration of refeeding periods was 51 days for D5,46 days for D10, 41 days for D15 and 36 days for D20, which was dictated by the length of the fasting period. The control group (DO) was continually fed to satiation throughout the experiment. The experiment lasted 8 weeks. Fish in all the experimental groups were fed the same diet (40.89% crude protein and 14.27% crude fat). Each group was assigned to triplicate groups of 25 fish per tank in a completely randomized design. Fish were maintained in fiberglass tanks (600 L) and supplied with flowing seawater (3L min-1);temperature and salinity were 28±1℃and 29 g L-1, respectively. Dissolved oxygen concentrations were not below than 5.0 mg L'1 at any point. Fish were fed twice daily (0800 h and 1600h).Significant decrease in body weight was recorded as early as on day 10 of starvation. On day 20 this decrease was more pronounced, reaching lower value in comparison to the days,5-15 (P0.04). Survival was significantly affected by the length of starvation periods. Fish that starved for 20 days showed a lower survival rate than fish in control group, D5 and D10 (P0.05).A concomitant decrease in the whole body and muscle lipid content was also observed during this period, with a progressive decrease from day 10 to day 20 of starvation in

关键词： Starvation Refeeding Juvenile black sea bream acanthopagrus schlegelii Compensatory growth Enzymes activities Gastrointestinal tract Histological structure

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