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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Experimentally derived estimates of growth by juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura) from nursery beaches in Hong Kong
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Experimentally derived estimates of growth by juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura) from nursery beaches in Hong Kong

机译：根据实验得出的估计，来自香港苗圃海滩上的幼体短吻鳄和圆角拟小体（Xiphosura）的生长

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摘要

Juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda with prosomal widths of between 17.1 and 91.1 mm were obtained from their nursery beaches in Hong Kong. They were kept in the laboratory and fed a mixture of squid, prawn and fish. Prosomal width and wet weight were measured weekly to obtain growth data. Over half of the individuals molted during a five and a half month captivity period. After every ecdysis, prosomal width and wet weight of T. tridentatus grew by averages of 24.2% and 71.5% over pre-molt measurements, respectively. Similar values were obtained for C. rotundicauda, i.e. 24.0% and 77.3%, respectively. Three T. tridentatus with prosomal widths of between 26.5 and 35.0 mm molted twice between 89 and 149 days, leading to an average growth rate of 0.1 mm·day~(-1) and 0.04 g·day~(-1) in terms of prosomal width and wet weight, respectively. A positive growth allometry (b coefficient=2.97) was identified, indicating that weight gain for T. tridentatus, and possibly C. rotundicauda, was faster than prosomal width growth after each ecdysis. The effect of temperature on growth was also determined by comparing the percentages of T. tridentatus which molted at ～28℃ and ～18℃. Fifty percent of individuals molted at the former, but only 10% at the latter. This study indicates that Hong Kong horseshoe crabs take a shorter time to reach sexual maturity, as compared with conspecifics in Japan, because they can molt more frequently at higher sediment/water temperatures (～28℃) if food is available.
机译：从他们在香港的苗圃海滩上获得的幼体Tachypleus tridentatus和Carcinoscorpius rotundicauda的体粒宽度在17.1和91.1 mm之间。他们被关在实验室，喂了鱿鱼，虾和鱼的混合物。每周测量正常体的宽度和湿重，以获得生长数据。在五个半月的囚禁期间，超过一半的人蜕皮。每次蜕皮后，三角毛锥虫的体间宽度和湿重比蜕皮前的平均值分别增长了24.2％和71.5％。圆形假单胞菌获得了相似的值，分别为24.0％和77.3％。三种宽约介于26.5至35.0毫米之间的三角锥虫在89至149天之间两次蜕变，导致平均生长速率分别为0.1 mm·day〜（-1）和0.04 g·day〜（-1）。体宽和湿重分别。确定了生长的正向异速生长法（b系数= 2.97），这表明三角锥虫以及可能的圆形假单胞菌的体重增加比每次蜕皮后的正常宽度增长快。还通过比较在〜28℃和〜18℃下蜕变的三角生丁香的百分比来确定温度对生长的影响。 50％的人在前者蜕皮，但只有10％在后者。这项研究表明，与日本同类动物相比，香港horse的性成熟时间更短，因为如果有食物，它们在更高的沉积物/水温（〜28℃）下会更频繁地蜕皮。

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