Utilization and trade of sharks and rays in the Andaman Islands, India

Tyabji, Zoya; Jabado, Rima W.; Sutaria, Dipani

doi:10.1016/j.marpol.2022.105295

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…Targeted ray fisheries are a growing concern around the world and are believed to be developing as a response to declining teleost fish stocks (e.g. Haque et al, 2022; Tyabji et al, 2022). However, the situation in Angola is markedly different from other countries, with results indicating that rays were targeted by most fishers for meat consumption (dry and fresh) as a national traditional dish for coastal communities.…”

Section: Discussionmentioning

confidence: 99%

“…Fishers noted prices ranging between $US 18–25 per kg for large fins, which corresponds to a similar United Arab Emirates (UAE), where, depending on the species, one large fresh fin could sell at a starting price of $US 17 (Jabado et al, 2015). Higher market prices are reported from India and range between $US 24.13–26.82 per kg for small fin sizes, up to $US 80.45 per kg for large fins, and with guitarfish fins ranging between $US 29.49–107.26 (Tyabji et al, 2022). Similarly, in Ghana, dried shark fins are sold at prices between $US 8.7–104.0 per kg, averaging $US 38.4 per kg (Sekey et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

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Fisher perceptions of catch and trade of sharks and rays in Angolan small‐scale fisheries

Soares,

Jabado

2024

Aquatic Conservation

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Small‐scale fisheries ensure food security and employment in Angolan coastal communities. These dynamic, widespread fisheries remain mostly unregulated, with limited data available despite their likely significant impact on marine megafauna. We used an interview‐based survey to investigate local fisher interactions with elasmobranchs (sharks and rays) and gather information on utilization, trade and perceptions. All fishers (n = 83) landed elasmobranchs. Most fishers considered sharks as bycatch (74.7%, n = 62), while 100% targeted rays (Order Myliobatiformes), and 62.8% (n = 52) targeted guitarfishes (Order Rhinopristiformes). Over 80% of fishers reported declining catches and sizes of elasmobranchs over the last 30 years, raising concerns about the sustainability of these fisheries. Utilization and trade routes varied depending on elasmobranch products, with exports to China (fins) and local market sales (meat). Specifically, 8.4% (n = 5) of fishers confirmed meat and fin exports to China (4.8%, n = 3). The protection of sharks was considered by 32.5% (n = 30) of respondents, while 21.7% (n = 18) believed only certain shark species should be protected. Most respondents reported that rays (80.5%, n = 67) and guitarfishes (61%, n = 51) should not be protected. Regarding the ban on fishing, none considered it for ray species, with only 6.1% (n = 5) supporting this idea for guitarfishes. We highlight the lack of elasmobranch‐specific conservation measures and the need for a multi‐pronged approach to inform policy. Considering the scale of these fisheries, management actions need to be urgently developed and implemented to ensure the sustainability of elasmobranch fisheries while securing the livelihoods of coastal communities.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fisher perceptions of catch and trade of sharks and rays in Angolan small‐scale fisheries

Soares,

Jabado

2024

Aquatic Conservation

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“…Aquatic habitat conditions in the waters of South Nias and North Nias support the habitat of Elasmobranchs, especially stingrays that were generally adult-sized and targets for fishing. In addition, in the Andaman Islands of the Indian Ocean, fisheries have reported declines in the population of several shark and ray species, but the targeted fishery for Chondrichthyes persists (Tyabji et al 2022).…”

Section: Commercially Chondrichthyes In Niasmentioning

confidence: 99%

The first report of DNA barcoding of commercially important fish in Nias Islands, Indonesia

RAMADHANIATY,

MANURUNG,

KHAIRUNNISA

et al. 2024

Biodiversitas

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Abstract. Ramadhaniaty M, Manurung VR, Khairunnisa, Lubis F, Susetya IE. 2024. The first report of DNA barcoding of commercially important fish in Nias Islands, Indonesia. Biodiversitas 25: 742-753. The Nias Islands are an archipelago in the western part of North Sumatera, encompassed by the Indian Ocean, and have become a hotspot for demersal and pelagic fishes. These geographical conditions endow the waters around Nias with large fishery resources, leading to their frequent utilization as fishing grounds for Sumatera Island and its surrounding areas. This research aimed to identify the commercially important fish species with the highest catch frequency in the waters of Nias, and this identification marked the initial stage of the sustainable utilization of fish resources. The method used was DNA Barcoding using genes targeting the COI Mitochondrial locus. Therefore, 43 samples were collected from several North and South Nias fish landing sites. The obtained species were classified into 3 groups based on the commodity type: demersal fish, pelagic fish, and Choncricthyes. There were 8 species of demersal fish (Caesio caerulaurea, Halichoeres scapularis, Lethrinus ornatus, Mulloidichthys flavolineatus, Parupeneus barberinus, Scarus prasiognathos, Plectropomus leopardus, and Variola albimarginata), displaying genetic distances ranging from 0.002-0.275. Pelagic fish consisted of 5 species, namely Amblygaster clupoides, Caranx ignobilis, Caranx sexfasciatus, Ferdauia ferdau, and Scomberomorus commerson, displaying genetic distances ranging from 0.002-0.267. The next commodities were Chondrichthyes with 9 species (Carcharhinus sealei, Himantura leoparda, Neotrygon kuhlii, Paragaleus randalli, Pateobatis jenkinsii, Rhynchobatus cf laevis, Spyrna lewini, Taeniura meyeni, and Urogymnus granulatus), displaying genetic distance ranging from 0-0.271. This value indicates that migratory species such as chondrichthyes have quite extensive movements so that the genetic distance between species and between populations tends to be low.

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“…Expanding this knowledge is essential for improving the biodiversity monitoring and management of elasmobranchs as they are one of the most threatened vertebrate groups globally with an estimated one‐third of species being driven to extinction mainly through overfishing (Dulvy et al., 2021 ). High levels of overexploitation of elasmobranchs are a result of the demand for consumer products such as fins, gill plates and liver oil traded internationally, as well as increased demand for shark meat for consumption due to dwindling teleost fish stocks (Cardeñosa et al., 2022 ; Seidu et al., 2022 ; Tyabji et al., 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Local adaptation with gene flow in a highly dispersive shark

Klein,

Maduna,

Dicken

et al. 2023

Evolutionary Applications

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Adaptive divergence in response to environmental clines are expected to be common in species occupying heterogeneous environments. Despite numerous advances in techniques appropriate for non‐model species, gene–environment association studies in elasmobranchs are still scarce. The bronze whaler or copper shark (Carcharhinus brachyurus) is a large coastal shark with a wide distribution and one of the most exploited elasmobranchs in southern Africa. Here, we assessed the distribution of neutral and adaptive genomic diversity in C. brachyurus across a highly heterogeneous environment in southern Africa based on genome‐wide SNPs obtained through a restriction site‐associated DNA method (3RAD). A combination of differentiation‐based genome‐scan (outflank) and genotype–environment analyses (redundancy analysis, latent factor mixed models) identified a total of 234 differentiation‐based outlier and candidate SNPs associated with bioclimatic variables. Analysis of 26,299 putatively neutral SNPs revealed moderate and evenly distributed levels of genomic diversity across sites from the east coast of South Africa to Angola. Multivariate and clustering analyses demonstrated a high degree of gene flow with no significant population structuring among or within ocean basins. In contrast, the putatively adaptive SNPs demonstrated the presence of two clusters and deep divergence between Angola and all other individuals from Namibia and South Africa. These results provide evidence for adaptive divergence in response to a heterogeneous seascape in a large, mobile shark despite high levels of gene flow. These results are expected to inform management strategies and policy at the national and regional level for conservation of C. brachyurus populations.

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Utilization and trade of sharks and rays in the Andaman Islands, India

Cited by 8 publications

References 38 publications

Fisher perceptions of catch and trade of sharks and rays in Angolan small‐scale fisheries

Fisher perceptions of catch and trade of sharks and rays in Angolan small‐scale fisheries

The first report of DNA barcoding of commercially important fish in Nias Islands, Indonesia

Local adaptation with gene flow in a highly dispersive shark

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