Insights from catch composition and historical records of elasmobranchs in the Malvan fishery on the central west coast of India

Author:

Kottillil Shruthi12ORCID,Gupta Trisha13,Manoharakrishnan Muralidharan1,Rao Chetan1,Shanker Kartik14

Affiliation:

1. Dakshin Foundation Bangalore India

2. Department of Energy and Environment TERI School of Advanced Studies (TERI SAS) New Delhi India

3. Interdisciplinary Centre for Conservation Science, Department of Zoology University of Oxford Oxford UK

4. Centre for Ecological Sciences Indian Institute of Science Bangalore India

Abstract

AbstractAlthough elasmobranchs (sharks and rays) are highly threatened by fisheries, there are few studies that examine gear and fishery effects on catch composition and abundance across India, one of the top elasmobranch fishing nations globally. We assessed elasmobranch diversity, abundance, catch rates and fishery characteristics using landing surveys in Malvan on the central‐western coast of India, a major multi‐gear, multi‐species fishing centre, over three sampling periods from February 2018 to March 2020. We sampled 3145 fishing trips and recorded 27 elasmobranch species, of which nearly half are categorised as “Threatened” by the IUCN. In addition, we documented historical records by compiling information from identification guides, research papers, articles and reports. During the study period, the catch was dominated by small‐sized coastal species like the spadenose shark (Scoliodon laticaudus) and the scaly whipray (Brevitrygon walga). Trawlers accounted for 64.9% of the catch, highest by number, and captured smaller‐sized individuals. Nonetheless, artisanal and gillnet fisheries had higher catch per unit effort (CPUE) for rays (5.1 ± 1.0) and sharks (10 ± 1.0), respectively, and captured significantly larger‐sized individuals. Through generalised linear models, we found seasonal, gear and fishery effects on the abundance and size of commonly caught species. The presence of neonates and gravid females of multiple species also suggests nursery grounds in this region. Historically, 141 species have been recorded in this region, and a comparison with current catch suggests a shift in elasmobranch community structure and potential mesopredator release. This study emphasises the importance of gear and species‐specific research for conservation planning at the local level and suggests the need for management strategies with fisher cooperation.

Publisher

Wiley

Subject

Aquatic Science,Ecology, Evolution, Behavior and Systematics

Reference83 articles.

1. On a Collection of Fishes from the Malvan Marine Sanctuary, Malvan, Maharashtra, India

2. Demographics and length and weight relationships of commercially important sharks along the north-western coast of India

3. Shifting baselines and the decline of pelagic sharks in the Gulf of Mexico

4. Reproductive biology of the scalloped hammerhead shark Sphyrna lewini (Chondrichthyes: Sphyrnidae) off south‐west Mexico. aqua: International;Bejarano‐Álvarez M.;Journal of Ichthyology,2011

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3