Intense pressure on small and juvenile coral reef fishes threatens fishery production in Madagascar

IF 2 3区农林科学 Q2 FISHERIES

Fisheries Management and Ecology Pub Date : 2023-06-07 DOI:10.1111/fme.12637

Harinirina Sandra Ranaivomanana, Sébastien Jaquemet, Dominique Ponton, Faustinato Behivoke, Roddy Michel Randriatsara, Jamal Mahafina, Marc Léopold

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引用次数: 0

Abstract

Size-based indicators are appropriate for monitoring status and guiding management of multi-species, multi-gear fisheries, such as coral reef fisheries. From May 2018 to April 2019, size distribution and composition of coral reef fish catches were monitored through a participatory landing survey in southwestern Madagascar. Fishers targeted a large diversity of fish taxa (75 families) and range of sizes (1.6–86 cm). Five predominant gears accounted for most of the catch (1360 [±39] t), including mosquito net trawl (27.7%), beach seine (26.8%), speargun (7.2%), gillnet (30.6%), and handline (7.1%). Due to widespread use of gears made from mosquito nets, 75% of fishes smaller than 9 cm and 47% of juvenile fishes were represented in the total catch number. Large-size taxa (Scaridae, Lethrinidae, Siganidae, Acanthuridae, Synodontidae, Mullidae, and Labridae) were mostly harvested as juveniles. Catches varied by 8%–70% throughout the year. Size of coral reef fish, annual catches, and catch rates all declined since the 1990s.

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小型和幼年珊瑚礁鱼类面临的巨大压力威胁着马达加斯加的渔业生产

以大小为基础的指标适用于监测多物种、多渔场(如珊瑚礁渔场)的状况和指导管理。2018年5月至2019年4月，通过马达加斯加西南部的参与式登陆调查，监测了珊瑚礁鱼类捕捞的大小分布和组成。渔民瞄准了种类繁多的鱼类分类群(75科)和大小范围(1.6-86厘米)。占捕获量最多的5种优势渔具(1360[±39]t)，分别为蚊帐拖网(27.7%)、沙滩围网(26.8%)、鱼叉(7.2%)、刺网(30.6%)和手绳(7.1%)。由于广泛使用蚊帐制成的渔具，75%的9厘米以下鱼类和47%的幼鱼被捕获。大型分类群(刺甲科、刺甲科、刺甲科、刺甲科、刺甲科、刺甲科和刺甲科)大多在幼体时收获。全年渔获量变化在8%-70%之间。自20世纪90年代以来，珊瑚礁鱼类的大小、年捕获量和捕捞率都有所下降。

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来源期刊

Fisheries Management and Ecology 农林科学-渔业

CiteScore

3.80

自引率

5.00%

发文量

审稿时长

12-24 weeks

期刊介绍： Fisheries Management and Ecology is a journal with an international perspective. It presents papers that cover all aspects of the management, ecology and conservation of inland, estuarine and coastal fisheries. The Journal aims to: foster an understanding of the maintenance, development and management of the conditions under which fish populations and communities thrive, and how they and their habitat can be conserved and enhanced; promote a thorough understanding of the dual nature of fisheries as valuable resources exploited for food, recreational and commercial purposes and as pivotal indicators of aquatic habitat quality and conservation status; help fisheries managers focus upon policy, management, operational, conservation and ecological issues; assist fisheries ecologists become more aware of the needs of managers for information, techniques, tools and concepts; integrate ecological studies with all aspects of management; ensure that the conservation of fisheries and their environments is a recurring theme in fisheries and aquatic management.