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首页> 外文期刊>Aquacultural Engineering: An International Journal >High stocking density and food restriction have minimum impact on size dispersal of cultured Senegalese sole (Solea senegalensis, Kaup 1858) juveniles. Evidence for individual growth being regulated by population structure
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High stocking density and food restriction have minimum impact on size dispersal of cultured Senegalese sole (Solea senegalensis, Kaup 1858) juveniles. Evidence for individual growth being regulated by population structure

机译：高放养密度和食物限制对养殖的塞内加尔（Solea senegalensis，Kaup 1858）幼体的大小扩散影响最小。个体成长的证据受人口结构调节

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The individual growth being regulated by population structure was studied in cultured populations of Senegalese sole (Solea senegalensis Kaup) juveniles. Soles constituting an initial population were individually tagged and their specific growth rates (SGR) registered after two months of growth. Fish were then graded in order to achieve four new subpopulations based in their previous growths and cultured for other additional 60 days. Three subpopulations consisted of individuals that had previously shown an average SGR (% day(-1)) of 1.04 +/- 0.3, 0.66 +/- 0.1 and 0.18 +/- 0.1, respectively. A fourth sole subpopulation was established from randomly selected juveniles to constitute the ungraded control group. Growth of the three subpopulations originally graded according to high (1.04% day(-1)), medium (0.66% day(-1)) and low (0.18%day(-1)) SGR soles, was always similar (P > 0.05) at any time (close to 0.60% day(-1)). SGR distributions along time revealed a tendency of the three subpopulations to achieve similar growth rate dispersals to that of the ungraded group after 60 days of culture.The individual growth of sole juveniles was also determined in populations that were subject to increased stocking density and food restriction. Soles stocked at high density (N = 110 fish tank(-1); 30.97 +/- 0.8 kg m(-2)) showed an increased growth standard deviation when compared with individuals kept at low density (N = 20 fish tank(-1); 6.20 +/- 0.2 kg m(-2)). In contrast, it was found that population growth dispersal was unaffected in soles fed at a daily ration of either 0.25% or 1.0% of their biomass. Minimum consequences on overall size dispersal in terms of Delta CV were found when high stocking and restricted food ration conditions were compared to control groups. Overall results from this work indicate that individual growth of captive juvenile soles was mainly regulated at a population level, existing a strong tendency to achieve a social arrangement in terms of growth. High stocking density and low feeding ration assay suggests that potentially competitive rearing conditions do not contribute to increase population size dispersal during intensive production of S. senegalensis
机译：在塞内加尔ese（Solea senegalensis Kaup）少年的养殖种群中研究了受种群结构调节的个体生长。对构成初始种群的鞋底进行单独标记，并在生长两个月后记录其比生长速率（SGR）。然后对鱼进行分级，以便在以前的生长基础上获得四个新的亚种群，并再培养60天。三个亚群由先前显示平均SGR（％day（-1））为1.04 +/- 0.3、0.66 +/- 0.1和0.18 +/- 0.1的个体组成。从随机选择的少年中建立第四个唯一的亚群，以构成未分级的对照组。最初根据SGR高（1.04％day（-1），中（0.66％day（-1））和低（0.18％day（-1））SGR鞋底分级的三个亚群的生长始终相似（P> 0.05）的任何时间（接近0.60％day（-1））。 SGR随时间的分布表明，培养60天后，这三个亚群的生长速率趋向于与未分级群体相似的分布。此外，还确定了种群中单独幼鱼的个体生长，这些种群受种群密度和食物限制的增加。与保持低密度的个体（N = 20鱼缸（-）相比，高密度（N = 110鱼缸（-1）; 30.97 +/- 0.8 kg m（-2））放养的鞋底显示出增长的标准偏差。 1）; 6.20 +/- 0.2 kg m（-2））。相比之下，发现以日进食量为其生物量的0.25％或1.0％饲喂的鞋底，种群增长的扩散不受影响。当将高库存和有限的食物配给条件与对照组进行比较时，发现总的尺寸分散对Delta CV的影响最小。这项工作的总体结果表明，圈养少年脚底的个体生长主要在人口水平上受到控制，存在着在增长方面实现社会安排的强烈趋势。高放养密度和低饲喂量测定表明潜在的竞争性饲养条件在塞内加尔沙门氏菌集约化生产期间无助于增加种群规模

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