The fate of the most threatened order of elasmobranchs: Shark-like batoids (Rhinopristiformes) in the Arabian Sea and adjacent waters

Jabado, Rima W.

doi:10.1016/j.fishres.2018.03.022

Cited by 52 publications

(72 citation statements)

References 39 publications

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“…The high-quality meat is consumed by many coastal 288 communities in tropical countries and it is also dried, salted, and consumed locally or traded 289 internationally (e.g. Moore, 2017;Jabado, 2018). Large whole wedgefishes (>200 cm total length; TL) 290 have been traded for a high value of up to US$680 each (e.g.…”

Section: Life History 219mentioning

confidence: 99%

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The thin edge of the wedge: extremely high extinction risk in wedgefishes and giant guitarfishes

Kyne

Jabado

Rigby

et al. 2019

Preprint

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The process of understanding the rapid global decline of sawfishes (Pristidae) has revealed great concern for their relatives, the wedgefishes (Rhinidae) and giant guitarfishes (Glaucostegidae), not least because all three families are targeted for their high-value and internationally-traded white fins. The objective of this study was to assess the extinction risk of all 10 wedgefishes and 6 giant guitarfishes by applying the International Union for Conservation of Nature (IUCN) Red List Categories and Criteria, and to summarise their biogeography and habitat, life history, exploitation, use and trade, and population status. Wedgefishes and giant guitarfishes have overtaken sawfishes as the most imperilled marine fish families globally, with all but one of the 16 species facing an extremely high risk of extinction due to a combination of traits: limited biological productivity, presence in shallow waters overlapping with some of the most intense and increasing coastal fisheries in the world, and over-exploitation in target and bycatch fisheries driven by the need for animal protein and food security in coastal communities and trade in meat and high-value fins. Two species with very restricted ranges, the Clown Wedgefish (Rhynchobatus cooki) of the Indo-Malay Archipelago and the False Shark Ray (Rhynchorhina mauritaniensis) of Mauritania may be very close to extinction. Only the Eyebrow Wedgefish (Rhynchobatus palpebratus) is not assessed as Critically Endangered, due to it occurring primarily in Australia where fishing pressure is low, and some management measures are in place. Australia represents a lifeboat for the three wedgefish and one giant guitarfish species occurring there. To conserve populations and permit recovery, a suite of measures will be required which will need to include species protection, spatial management, bycatch mitigation, and harvest and international trade management, all of which will be dependent on effective enforcement.

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Section: Life History 219mentioning

confidence: 99%

“…Large whole wedgefishes (>200 cm total length; TL) 290 have been traded for a high value of up to US$680 each (e.g. Jabado, 2018). Prices for the highly-291 valued 'white' fins of large shark-like rays are reportedly as high as US$964/kg (Jabado, 2019).…”

Section: Life History 219mentioning

confidence: 99%

The thin edge of the wedge: extremely high extinction risk in wedgefishes and giant guitarfishes

Kyne

Jabado

Rigby

et al. 2019

Preprint

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“…However, the value of this partnership may go unacknowledged by fishery managers, presenting an untapped resource for gathering ecological data, while fostering stewardship through acknowledging the expertise of fishers. In developing nations, researchers associated with academic institutions are gathering experiential knowledge such as shark abundance, size trends, and market values through questionnaires, interviews, or by employing community members as data collectors (Jabado et al, 2015, Jabado, 2018Jaiteh et al, 2016a;Humber et al, 2017). These findings are shared with the academic community and others with access to scientific journals, however, pathways on how to use this in management are not explicit.…”

Section: Value Formation Through Physical Interaction: Tourism and Fimentioning

confidence: 99%

“…In this paper, "sharks" is used to refer collectively to Chondrichthyan species -that is, sharks, skates, rays, and chimeras. Policymakers and resource managers encounter many compounding barriers in attempting to conserve shark populations, spanning across aspects from ecological and biological to institutional, economical, and sociological (Chin et al, 2010;Bornatowski et al, 2014;Dulvy et al, 2017;Jabado, 2018). Although some "bright spots" of shark fishery management have emerged , many populations are at risk of extinction due to historical over-exploitation, and a life-history pattern which lends to relatively slow recovery (e.g., larger sharks live relatively long, and reproduce small litters on a several-yearly basis) (Compagno, 1990;Field et al, 2010).…”

Section: Introduction Why Value Sharks?mentioning

confidence: 99%

Introducing Relational Values as a Tool for Shark Conservation, Science, and Management

2019

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Relational values (RV) are values that arise from a relationship with nature, encompassing a sense of place, feelings of well-being (mental and physical health), and cultural, community, or personal identities. With sharks, such values are formed by diverse groups that interact with these animals and their ecosystems, either physically or virtually, whether a scientist, student, fisher, or media-viewer. Further, these user groups may overlap or come into conflict over management plans, media portrayals of sharks, and their conservation status. Although scientists have not explicitly aimed to assess RV through sharks, qualitative studies of shark fishers, tourism operators, tourists, and the public, as well as historical and archeological accounts, can be interpreted through an analytical lens to reveal values which can also be defined as relational. To this end, this review considers studies capturing RV alongside those of economic value (increasingly, the value of a shark is appraised by their financial value in shark tourism) and the social and cultural roles of sharks. Based on these studies and the broader RV literature, we then outline a workflow for how RV can be leveraged in scientific inquiry, equitable resource management, and education. We conclude that via collaborative assessments of RV, with implicit inclusion of multiple values of sharks and by acknowledging their importance to all parties involved in user conflicts, the RV framework can lead to a constructive dialog on polarizing conservation and management issues. By illuminating shared values, and/or revealing dichotomies of values ascribed toward certain areas or objects, this framework can provide inroads to mediation, seeking to conserve or even restore relationships with nature, and their derived values as much as is possible. This approach can yield unexpected knowledge, solutions, and compromises in an increasingly complex conservation landscape.

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“…All the batoids, especially Rhinopristiformes are considered to be at high risk of extinction in certain parts of the world and in view of this, a proposal to include all of them in the CITES annex is in the process (Moore, 2017). The Bengal guitarfish, Rhinobatos annandalei Norman, 1926, currently has a distribution range from Sri Lanka, India, Pakistan and also possibly from the Gulf (Last et al, 2016;Jabado, 2018). It is classed in the IUCN red list threatened species as data deficient (DD) (Valenti, 2009).…”

Section: Introductionmentioning

confidence: 99%

Biological observations on the Bengal guitarfish Rhinobatos annandalei Norman, 1926 from the Eastern Arabian Sea, India

Purushottama¹,

Ramasubramanian²,

Akhilesh³

et al. 2020

Indian J. Fish.

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Biological data for the little known Bengal guitarfish Rhinobatos annandalei Norman, 1926 (Rhinopristiformes: Rhinobatidae) are presented based on specimens collected from bycatch of commercial shrimp trawlers, gill netters and bag or dol netters operating in the Arabian Sea at depths of 2-70 m off the north-west coast of India. Five hundred ninety-three specimens measuring 30.0 to 95.0 cm total length (TL) and weighing between 64.0 to 3300 g total weight (TW) were collected for the study. The length-weight relationships (LWR) were significantly different between the sexes (p<0.001) and for the combined sexes was derived as TW= 0.000604 TL3.408256 (r2= 0.997). The co-efficients ‘a’, ‘b’ of the LWR were estimated as 0.000621, 3.410115 (r2= 0.999) for females and 0.000766, 3.333872 (r2= 0.999) for males. The length at maturity (TL50) for females and males was estimated to be 61.0 and 63.3 cm TL, respectively. In a single female, the number of embryos ranged from 2 to 11 and the size at birth was estimated between 25.0 to 30.0 cm TL. The overall sex ratio favoured females at the rate of 1.6:1. An analysis of the stomach contents (%IRI) revealed that R. annandalei mainly fed on Solenocera spp. (18.7% IRI), along with P. sculptilis (0.5% IRI), P. stylifera (0.4% IRI), Loligo spp. (0.4% IRI) and sciaenids (0.3% IRI). Since, the species is poorly studied and assessed as ‘Data Deficient’ in the IUCN red list criterion, it is anticipated that the biological results from the present study, will update information on the species thereby enabling more effective management decisions.

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The fate of the most threatened order of elasmobranchs: Shark-like batoids (Rhinopristiformes) in the Arabian Sea and adjacent waters

Cited by 52 publications

References 39 publications

The thin edge of the wedge: extremely high extinction risk in wedgefishes and giant guitarfishes

The thin edge of the wedge: extremely high extinction risk in wedgefishes and giant guitarfishes

Introducing Relational Values as a Tool for Shark Conservation, Science, and Management

Biological observations on the Bengal guitarfish Rhinobatos annandalei Norman, 1926 from the Eastern Arabian Sea, India

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