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首页> 外文期刊>Estuarine Coastal and Shelf Science >Body growth and reproduction of individuals of the sciaenid fish Stellifer rastrifer in a shallow tropical bight: A cautionary tale for assumptions regarding population parameters
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Body growth and reproduction of individuals of the sciaenid fish Stellifer rastrifer in a shallow tropical bight: A cautionary tale for assumptions regarding population parameters

机译：浅海热带海域中短吻鲷鱼Stellifer rastrifer个体的身体生长和繁殖：关于种群参数的假设的警告性故事

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摘要

Knowledge of population parameters and the ability to predict their responses to environmental changes are useful tools to aid in the appropriate management and conservation of natural resources. Samples of the sciaenid fish Stellifer rastrifer were taken from August 2003 through October 2004 in shallow areas of Caraguatatuba Bight, southeastern Brazil. The results showed a consistent presence of length-frequency classes throughout the year and low values of the gonadosomatic index of this species, indicating that the area is not used for spawning or residence of adults, but rather shelters individuals in late stages of development. The results may serve as a caveat for assessments of transitional areas such as the present one, the nursery function of which is neglected compared to estuaries and mangroves. The danger of mismanaging these areas by not considering their peculiarities is emphasized by using these data as a study case for the development of some broadly used population-parameter analyses. The individuals' body growth parameters from the von Bertalanffy model were estimated based on the most common approaches, and the best values obtained from traditional quantification methods of selection were very prone to bias. The low gonadosomatic index (GSI) estimated during the period was an important factor in stimulating us to select more reliable parameters of body growth (L∞ = 20.9, K = 0.37 and Z = 2.81), which were estimated based on assuming the existence of spatial segregation by size. The data obtained suggest that the estimated mortality rate included a high rate of migration of older individuals to deeper areas, where we assume that they completed their development.
机译：人口参数知识和预测其对环境变化的响应能力是有助于适当管理和保护自然资源的有用工具。从2003年8月至2004年10月，在巴西东南部的Caraguatatuba Bight浅水区采集了洋槐鱼Stellifer rastrifer的样品。结果表明，该物种全年都存在长短频类，并且该物种的性腺体指数较低，这表明该区域不用于成年或产卵，而是在发育的后期为个人提供庇护。结果可能是对过渡地区（如当前地区）进行评估的警告，该地区的育苗功能与河口和红树林相比被忽略了。通过将这些数据用作发展某些广泛使用的人口参数分析的研究案例，强调了不考虑其特殊性而对这些地区进行管理不善的危险。冯·贝塔兰菲模型的个体身体生长参数是根据最常用的方法估算的，而从传统的量化选择方法获得的最佳值很容易产生偏差。在此期间估算的低促性腺激素指数（GSI）是刺激我们选择更可靠的身体生长参数的重要因素（L∞= 20.9，K = 0.37和Z = 2.81），这些参数是根据假设存在按大小进行空间隔离。获得的数据表明，估计的死亡率包括较高的老年人迁移到更深的地区的速度，我们假设他们完成了发育。

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