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Age and growth of Diplodus vulgaris (Sparidae)in the Gulf of Tunis

机译：突尼斯海湾的寻常双翅类（西班牙）的年龄和生长

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Age and growth of the two-banded seabream (Diplodus vulgaris) from the Gulf of Tunis were investigated using scales and otoliths. Total length (TL) and weight (TW) ranged respectively from 10 to 32 cm and from 14 to 525 g (n = 570). The length-weight relationship was slightly but significantly allometric (b = 3.05 ± 0.02 s.e.) when data from both sexes were pooled. Marginal increment analysis proved that annuli were formed once a year, in June. Age readings were precise for the two hard structures, with low values of the index of average percent error. The power function well described the relationship between TL and scale or otolith radius (r > 0.92). The von Bertalanffy growth equation was fitted on mean backcalculated length-at-age data resulting in the following parameter values for scales (L = 39.9 cm, k = 0.11 year~(-1), t0 = -0.73 year) and for otoliths (L = 39.0 cm, k = 0.10 year~(-1), t0 = -0.96 year). Although scale readings provided a better fit, otolith readings could also be used with fairly good results. Among Sparids, D. vulgaris is a relatively slow growing and a moderate-lived species, with a maximum observed age of 12 years. Total length at maturity (TL 50) was 17.6 cm for males and 17.1 cm for females, which corresponds to an age of about 4 years. Large discrepancies in growth parameters between geographic areas are the result of different growth patterns.
机译：用鳞片和耳石研究了来自突尼斯湾的两带鲷（Diplodus vulgaris）的年龄和生长。总长度（TL）和重量（TW）分别为10到32厘米和14到525克（n = 570）。当汇集了来自两个性别的数据时，长度-重量关系是轻微但显着的异速关系（b = 3.05±0.02 s.e.）。边际增量分析证明，每年六月份形成环。对于这两个硬结构，年龄读数是精确的，平均百分误差指数的值较低。幂函数很好地描述了TL与标度或耳石半径之间的关系（r> 0.92）。将von Bertalanffy生长方程拟合在平均反算的年龄长度数据上，从而得到以下标尺（L = 39.9 cm，k = 0.11年〜（-1），t0 = -0.73年）和耳石的参数值（ L = 39.0厘米，k = 0.10年〜（-1），t0 = -0.96年）。虽然刻度读数提供了更好的拟合度，但是也可以使用耳石读数，获得相当好的结果。在Sparids中，寻常石。（D. vulgaris）是一个相对较慢的生长和中等寿命的物种，最大观测年龄为12岁。男性的成熟时总长度（TL 50）为17.6 cm，女性为17.1 cm，相当于大约4岁的年龄。地理区域之间增长参数的巨大差异是不同增长方式的结果。

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