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首页> 外文期刊>Aquatic Biology >Age determination and growth rate of a Callista chione population from the southwestern coast of Portugal
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Age determination and growth rate of a Callista chione population from the southwestern coast of Portugal

机译：葡萄牙西南海岸Callista chione种群的年龄确定和增长率

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The age and growth of the smooth clam Callista chione from the southwestern coast of Portugal were estimated during a 1 yr study period by using both the surface growth rings and internal shell microgrowth lines (by acetate peel method). The von Bertalanffy growth curves obtained by these 2 methods were, respectively: L_t = 91.9[1 - e~(-0.18)(t+0.22)] and L_t = 98.1[1 - e~(-0.15)(t+0.43)]. Based on these, the counting of surface growth rings is appropriate for a quick age estimation of individuals upto 10 yr old (approx 75 mm shell length, SL). For older specimens, analysis of the growth lines in the cross section of shells is recommended, because close to the shell border it becomes difficult to distinguish growth rings on the shell surface. Rapidshell growth occurred in spring and summer, whereas slow growth occurred during autumn and winter, with the deposition of an annual growth ring. The overall growth performance and the phi-prime index were used to compare growth parameters with data fromliterature about venerid bivalves. These parameters indicated that Callista spp. have a higher growth performance than other venerid bivalves and this is correlated with geographical latitude. The smooth clam achieves sexual maturation at 4 yr of age and reaches the minimum landing size (60 mm SL) after 5 yr.
机译：在1年的研究期内，通过使用表面生长环和内壳微生线（通过醋酸盐剥皮法）估算了葡萄牙西南海岸的蛤c Callista chione的年龄和生长。通过这两种方法获得的von Bertalanffy生长曲线分别为：L_t = 91.9 [1- e〜（-0.18）（t + 0.22）]和L_t = 98.1 [1- e〜（-0.15）（t + 0.43） ]。基于这些，对年轮的计数适用于快速估算年龄在10岁以下（壳长约75毫米，SL）的个体。对于较旧的标本，建议分析壳横截面中的生长线，因为靠近壳边界很难区分壳表面上的生长环。快速壳生长发生在春季和夏季，而缓慢生长发生在秋季和冬季，并伴有年轮生长。使用总体生长性能和phi-prime指数将生长参数与来自于雌性双壳类的文献数据进行比较。这些参数表示Callista spp。具有比其他双峰贝类更高的生长性能，这与地理纬度相关。光滑的蛤at在4岁时达到性成熟，并在5岁后达到最小着陆尺寸（60 mm SL）。

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