Tissue expression and stock variation of isozymes of stone flounder （Kareius bicoloratus） were analyzed with horizontal starch gel electrophoresis. For the fourteen enzymes assayed, 31 loci were recorded. The result...Tissue expression and stock variation of isozymes of stone flounder （Kareius bicoloratus） were analyzed with horizontal starch gel electrophoresis. For the fourteen enzymes assayed, 31 loci were recorded. The results indicated that all the isozymes examined were obviously tissue-specific. The expressions of SOD＊, GDH＊, G3PDH-2＊ and ADH-2＊ were detected only in liver, SDH-1＊, MDH-1＊ and ADH-1＊ only in muscle, and LDH-B＊ and LDH-C＊ only in eyes. In comparison, MDH-2＊, GPI-3＊ and SDH-2＊ were detected in all tissues examined. Other loci examined were detected in a variety of tissues. Muscle and liver were selected to detect the isozyme variation of the two geographic stocks of Qingdao and Weihai, Shandong Province, China. The percentages of polymorphic loci （P0.99） were 29.17% and 25.00%, the observed heterozygosities （H0） were 0.028 ±0.014 and 0.040 ± 0.019, and the expected heterozygosities （He） were 0.039±0.017 and 0.052±0.022 in Qingdao and Wethai stock, respectively. The coefficient of gene differentiation （Fst） and genetic distance （D） between the two stocks was 0.012 and 0.0011, respectively, indicating that the genetic differentiation is low between them. Compared with other species of Pleuronectiformes, both the percentage of polymorphic loci and the mean heterozygosity ofK. Bicoloratus were at a middle level.展开更多
This article summarizes the state of stocks of sardine,sardina pilchardusin Moroccan waters at the end of 2016 and 2018.These stocks varies ac-cording to the region,They are now in a sustainable exploitation situation...This article summarizes the state of stocks of sardine,sardina pilchardusin Moroccan waters at the end of 2016 and 2018.These stocks varies ac-cording to the region,They are now in a sustainable exploitation situation:Atlantic sardine,but also stocks that have reached or are still in over-ex-ploitation levels:Mediterranean sardine.The fishing pressure exerted onthe sardine stock exceeds the optimal level by 40%.Due to the degrada-tion of the fragile marine environment of the Mediterranean region,gen-eraled by pollution of various origins,the overexploitation of juveniles inthe coastal strip,non-responsible practices and the use of non-fishing gearselective,it is imperative to take the necessary measures to protect themarine environment and ensure rational and sustainable exploitation ofthe resource.(High commission plan 2006 report).展开更多
文摘Tissue expression and stock variation of isozymes of stone flounder （Kareius bicoloratus） were analyzed with horizontal starch gel electrophoresis. For the fourteen enzymes assayed, 31 loci were recorded. The results indicated that all the isozymes examined were obviously tissue-specific. The expressions of SOD＊, GDH＊, G3PDH-2＊ and ADH-2＊ were detected only in liver, SDH-1＊, MDH-1＊ and ADH-1＊ only in muscle, and LDH-B＊ and LDH-C＊ only in eyes. In comparison, MDH-2＊, GPI-3＊ and SDH-2＊ were detected in all tissues examined. Other loci examined were detected in a variety of tissues. Muscle and liver were selected to detect the isozyme variation of the two geographic stocks of Qingdao and Weihai, Shandong Province, China. The percentages of polymorphic loci （P0.99） were 29.17% and 25.00%, the observed heterozygosities （H0） were 0.028 ±0.014 and 0.040 ± 0.019, and the expected heterozygosities （He） were 0.039±0.017 and 0.052±0.022 in Qingdao and Wethai stock, respectively. The coefficient of gene differentiation （Fst） and genetic distance （D） between the two stocks was 0.012 and 0.0011, respectively, indicating that the genetic differentiation is low between them. Compared with other species of Pleuronectiformes, both the percentage of polymorphic loci and the mean heterozygosity ofK. Bicoloratus were at a middle level.
文摘This article summarizes the state of stocks of sardine,sardina pilchardusin Moroccan waters at the end of 2016 and 2018.These stocks varies ac-cording to the region,They are now in a sustainable exploitation situation:Atlantic sardine,but also stocks that have reached or are still in over-ex-ploitation levels:Mediterranean sardine.The fishing pressure exerted onthe sardine stock exceeds the optimal level by 40%.Due to the degrada-tion of the fragile marine environment of the Mediterranean region,gen-eraled by pollution of various origins,the overexploitation of juveniles inthe coastal strip,non-responsible practices and the use of non-fishing gearselective,it is imperative to take the necessary measures to protect themarine environment and ensure rational and sustainable exploitation ofthe resource.(High commission plan 2006 report).
