The marine catfish Genidens barbus (Ariidae) fisheries in the state of São Paulo, southeastern Brazil: diagnosis and management suggestions

Abstract In this study we analyzed data on fishing landings of Genidens barbus in the state of São Paulo, Brazil, from 2000 to 2014. An estimation of the total production was obtained through the analysis of 781,856 landings, among which 87% were categorized as artisanal and 13% as industrial. The abundance index showed some stability in the period. However, due to the high number of production units, the fishing effort need to be maintained, given that there is a risk that increased production might affect the abundance of G. barbus. Thus, as alternatives to maintaining marine catfish exploitation in southeastern Brazil under control, the following management actions can be suggested: i) prohibition of fishing activity by the industrial sector; ii) strengthening of inspection of the fleet that is not allowed to participate in the marine catfish fisheries, with emphasis on purse seiners; and iii) maintenance of a closed season for G. barbus, performing an adaptive management of fishing prohibition according to the reproductive biology of the species and with the support of artisanal fishers. These measures have the aim of promoting sustainable exploitation of G. barbus, especially through small-scale fisheries in southeastern Brazil.

摘要 本研究分析了2000年至2014年巴西圣保罗州海域真海鲶（Genidens barbus）的捕捞上岸数据。通过对781856份捕捞上岸记录的分析，估算了总捕捞产量，其中87%归类为手工渔业捕捞，13%为工业化捕捞。研究期间，该物种的资源丰度指数呈现一定稳定性。然而，由于捕捞作业单元数量众多，仍需维持现有捕捞努力量——鉴于产量提升可能会对真海鲶的种群丰度构成威胁。据此，为实现巴西东南部海域真海鲶捕捞的可控化管理与可持续开发，可提出以下管理措施：i）禁止工业化捕捞部门开展真海鲶捕捞活动；ii）强化对不得参与真海鲶捕捞作业的船队的检查力度，重点针对围网渔船；iii）维持真海鲶的禁渔期制度，并结合该物种的繁殖生物学特征开展捕捞禁令的适应性管理，同时获得手工渔民的支持。上述措施旨在推动真海鲶的可持续开发利用，尤其依托巴西东南部的小规模捕捞产业。