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Artisanal fishing activities and their documented interactions with juvenile white sharks inside a nursery area
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.5 ) Pub Date : 2020-02-20 , DOI: 10.1002/aqc.3300
Emiliano García‐Rodríguez 1 , Oscar Sosa‐Nishizaki 1
Affiliation  

  1. Juvenile white sharks distribute in coastal nursery areas, which are essential for population growth. Bahía Sebastián Vizcaíno (BSV), Mexico, is a white shark nursery area in the north‐eastern Pacific. Despite existing regulations forbidding the capture of white sharks, incidental catches still occur in some areas.
  2. Artisanal fisheries constitute one of the most important economic activities in BSV, yet no formal description of either these fisheries or the incidental catch of juvenile white sharks exists due to the poor data reporting system, thus preventing a clear understanding of the implications of these catches for the white shark population of the north‐eastern Pacific.
  3. Artisanal fishing activities and their interactions with juvenile white sharks in BSV are described based on fishermen's knowledge. Artisanal fisheries in BSV are multi‐specific, targeting mostly bottom‐related species (e.g. white seabass and California halibut) that are also common prey for juvenile white sharks. These activities are the only source of income for the majority of fishermen in BSV and are conducted throughout the year, with gillnets being the main fishing gear.
  4. White sharks are incidentally caught in bottom gillnets mainly during the summer, although another peak in incidental catch was recorded during winter, possibly related to the presence of juvenile white sharks from California, USA. The most common size of juvenile white sharks incidentally caught was <2 m in the nearshore areas close to the mouth of the Ojo de Liebre Lagoon; larger juveniles (~3 m) were caught in areas near Cedros, Natividad, and San Benito Islands.
  5. The multi‐specific nature of BSV artisanal fisheries and their socio‐economic value, and the high post‐release survival of juvenile white sharks suggest that future regulatory actions should focus on the release of incidentally caught live juvenile white sharks and the involvement of the BSV fishing community to increase the effectiveness of management efforts.


中文翻译:

手工捕鱼活动及其与苗圃区域内幼白鲨的互动记录

  1. 幼白鲨分布在沿海苗圃地区,这对人口增长至关重要。墨西哥的BahíaSebastiánVizcaíno(BSV)是东北太平洋的一个白鲨苗圃地区。尽管现行法规禁止捕捞白鲨,但在某些地区仍然发生偶然的捕捞。
  2. 手工渔业是BSV中最重要的经济活动之一,但是由于数据报告系统不完善,这些渔业或幼年白鲨的偶然捕捞都没有正式的描述,因此无法清楚地了解这些捕捞对渔业的影响。东北太平洋的白鲨种群。
  3. 基于渔民的知识,描述了手工捕鱼活动及其与BSV中的幼白鲨的相互作用。BSV的手工渔业是多用途的,主要针对与海底有关的物种(例如,白色鲈鱼和加利福尼亚大比目鱼),它们也是幼年白鲨的常见猎物。这些活动是BSV大多数渔民的唯一收入来源,并且全年进行,刺网是主要的捕鱼工具。
  4. 白鲨主要在夏季被偶然捕获在底部的刺网中,尽管在冬季还记录到了另一个捕获高峰,这可能与来自美国加利福尼亚州的幼年白鲨的存在有关。在Ojo de Liebre泻湖河口附近的近岸地区,偶然捕获的少年白鲨的最常见大小是<2 m;在塞德罗斯,纳蒂维达德和圣贝尼托群岛附近地区捕获了较大的少年(〜3 m)。
  5. BSV手工渔业的多特征性及其社会经济价值,以及幼白鲨的高释放后存活率,表明未来的监管行动应侧重于偶然捕获的活幼白鲨的释放和BSV的参与加大渔业社区管理工作的有效性。
更新日期:2020-02-20
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