Motorized trawling was banned off part of the Brazilian coast in 1990 due to environmental impacts, thus artisanal fishermen adopted large beach seines as an alternative. No impact assessments have been conducted on any species; therefore, we examined the life history and stock status of shorthead drum, Larimus breviceps, a primary bycatch in tropical shrimp fisheries. Between 2016 and 2017, 969 shorthead drum were collected and analyzed using ELEFAN-based models. Females were larger, more abundant, and older than males. Capture rates of juvenile were high, and no mega-spawners were found. Integrated stock assessment indicated slight overexploitation and growth overfishing. Increased yield per recruit was indicated by high length at first capture. Shorthead drum segregate ontogenetically by size. Growth, mortality, and longevity may be temperature-influenced. We found that beach seine fisheries may impact shorthead drum by population depletion and potential disruptions to reproductive capacity and recommend further studies and management to improve sustainability.

中文翻译：

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巴西东北部手工海滩围网捕捞的副渔获物——短落叶松鱼的种群评估

由于环境影响，1990 年巴西部分海岸禁止机动拖网捕鱼，因此手工渔民采用大型海滩围网作为替代方案。尚未对任何物种进行影响评估；因此，我们研究了短头石首鱼（ Larimus breviceps）的生活史和种群状况，它是热带虾渔业的主要副渔获物。2016 年至 2017 年间，使用基于 ELEFAN 的模型收集并分析了 969 个短头鼓。雌性比雄性更大、数量更多、年龄更大。幼鱼捕获率较高，未发现大型产卵者。综合种群评估表明存在轻微的过度开发和过度捕捞。首次捕获时的长度较长表明每次招募的产量增加。短头鼓按大小进行个体发育分离。生长、死亡率和寿命可能受到温度的影响。我们发现海滩围网渔业可能会因种群减少和潜在的繁殖能力中断而影响短头鼓，并建议进一步研究和管理以提高可持续性。