First report of four deep-sea chondrichthyans (Elasmobranchii and Holocephali) from Andaman waters, India with an updated checklist from the region

Kumar, Ravi; Venu, S.; Akhilesh, K; Bineesh, K. K.; Rajan, P. T.

doi:10.3750/aiep/02336

Cited by 18 publications

(16 citation statements)

References 17 publications

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“…tutul being a new record from India ( Table 2 , S1 Fig ). Five species previously reported as possibly occurring on the islands by Kumar et al [ 29 ] were confirmed: Aetomylaeus vespertilio , Glaucostegus typus , H . undulata , Mobula kuhlii , and P .…”

Section: Resultssupporting

confidence: 54%

“…The fish landing surveys carried out for sharks and rays in the Andaman and Nicobar Islands have greatly contributed to the current knowledge of species diversity and biology for the south and south-east Asian region. Three ray species are new records for the Andaman and Nicobar Islands, including one new record for India, increasing the elasmobranch diversity for the Andaman and Nicobar Islands from 103 to 106, and for India to 152 [ 29 ]. With this continuing increase in species records, it is clear that additional efforts are required to fully document the diversity of sharks and rays in India.…”

Section: Discussionmentioning

confidence: 99%

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Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

et al. 2020

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Detailed information on shark and ray fisheries in the Andaman and Nicobar Islands, India are limited, including information on the diversity and biological characteristics of these species. We carried out fish landing surveys in South Andamans from January 2017 to May 2018, a comprehensive and cost-effective way to fill this data gap. We sampled 5,742 individuals representing 57 shark and ray species landed from six types of fishing gears. Of the 36 species of sharks and 21 species of rays landed, six species of sharks ( Loxodon macrorhinus , Carcharhinus amblyrhynchos , Sphyrna lewini , C . albimarginatus , C . brevipinna , and Paragaleus randalli) comprised 83.35% of shark landings, while three species of rays ( Pateobatis jenkinsii , Himantura leoparda and H . tutul ) comprised 48.82% of ray landings, suggesting a species dominance in the catch or fishing region. We provide insights into the biology of species with extensions in maximum size for seven shark species. Additionally, we document an increase in the known ray diversity for the islands and for India with three previously unreported ray species. We found that amongst sharks, mature individuals of small-bodied species (63.48% males of total landings of species less than 1.5 m total length when mature) and immature individuals of larger species (84.79% males of total landings of species larger than 1.5 m total length when mature) were mostly landed; whereas for rays, mature individuals were predominantly landed (80.71% males of total landings) likely reflecting differences in habitat preferences along life-history stages across species and fishing gear. The largest size range in sharks was recorded in landings from pelagic longlines and gillnets. Further, the study emphasizes the overlap between critical habitats and fishing grounds, where immature sharks and gravid females were landed in large quantities which might be unsustainable in the long-term. Landings were female-biased in C . amblyrhynchos , S . lewini and P . jenkinsii , and male-biased in L . macrorhinus and H . leoparda , indicating either spatio-temporal or gear-specific sexual segregation in these species. Understanding seasonal and biological variability in the shark and ray landings over a longer study period across different fisheries will inform future conservation and fishery management measures for these species in the Andaman and Nicobar Islands.

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Section: Resultssupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

et al. 2020

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“…Eight species previously not confirmed but reported as possibly occurring on the islands by Kumar et al [24] have been confirmed: Aetomylaeus vespertilio, Glaucostegus typus, H. undulata, Mobula kuhlii , M. tarapacana, Pastinachus ater , P. jenkinsii , and Urogymnus asperrimus .…”

Section: Raysmentioning

confidence: 63%

“…This is the first systematic landing survey carried out for sharks and rays in the Andaman and Nicobar Islands, contributing to the current knowledge of species diversity and biology for the south and south-east Asian region. Three ray species are new records for the Andaman and Nicobar Islands, including one new record for India, increasing the elasmobranch diversity for the Andaman and Nicobar Islands from 103 to 106, and for India to 152 [24]. A threshold was reached in terms of shark species recorded, but additional efforts are required to fully document ray diversity.…”

Section: Discussionmentioning

confidence: 99%

Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

Tyabji

Wagh

Patankar

et al. 2020

Preprint

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The scientific literature on the diversity and biological characteristics of sharks and rays from the Andaman and Nicobar Archipelago fishing grounds is scarce and compromised by species misidentifications. We carried out systematic fish landing surveys in South Andamans from January 2017 to May 2018, a comprehensive and cost-effective way to fill this data gap. We sampled 5,742 individuals representing 57 shark and ray species. Of the 36 species of sharks and 21 species of rays landed, six species of sharks - Loxodon macrorhinus, Carcharhinus amblyrhynchos, Sphyrna lewini, Carcharhinus albimarginatus, Carcharhinus brevipinna, and Paragaelus randalli dominated landings and comprised 83.35 % of shark landings, while three species of rays were most abundant – Pateobatis jenkinsii, Himantura leoparda and H. tutul, and comprised 48.82 % of ray landings. We report size extensions for seven shark species as well as three previously unreported ray species, increasing the known diversity for the islands and for India. For sharks, mature individuals of small-bodied species (63.48 % males of total landings of species less than 1.5 m total length) and immature individuals of larger species (84.79 % males of total landings of species larger than 1.5 m total length) were mostly landed; whereas for rays, mature individuals were predominantly landed (80.71 % males of total landings) likely reflecting differences in fishing patterns as well as habitat preferences and life history stages across species. Further, juvenile sharks and gravid females were landed in large quantities which might be unsustainable in the long-term. Landings were female-biased in C. amblyrhynchos, S. lewini and P. jenkinsii, and male-biased in L. macrorhinus and H. leoparda, indicating either spatio-temporal or gear specific sexual segregation in these species. Understanding these nuances - the composition and biology of sharks and rays landed in different fisheries seasonally will inform future conservation and fishery management measures for these species in the Andaman and Nicobar Islands.

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“…The recent marine fish faunal studies from the Islands (Kumar et al, 2015(Kumar et al, , 2016(Kumar et al, , 2018Pradeep et al, 2016Pradeep et al, , 2017Pradeep et al, , 2018Vinu et al, 2017;Shirke et al, 2017;Tyabji et al, 2018) Fifteen new records of Batoids (Elasmobranchii) from waters off Andaman and Nicobar Islands, India recorded higher diversity in the landings and exploratory surveys. These studies will support future fisheries management in the Islands and improve India's compliance to Convention of Biodiversity (CBD) in documenting its fauna.…”

Section: Introductionmentioning

confidence: 99%

Fifteen new records of Batoids (Elasmobranchii) from waters off Andaman and Nicobar Islands, India

Bineesh¹,

Andaman²,

Kumar³

et al. 2020

J. Mar. Biol. Ass. India

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Marine waters of Andaman and Nicobar Islands, India in the tropical Indian Ocean, is a poorly explored high faunal diverse region. The present study documents new records of batoids from the region, identified during the fishery and diversity monitoring surveys conducted during November 2016 to June 2019 at different fish landing centers of Andaman and Nicobar Islands. Fifteen elasmobranch species including 2 wedgefishes, 1 skate and 12 rays were identified and confirmed as new reports for the region. Results of this study indicate that the elasmobranch diversity, especially batoid diversity of Andaman and Nicobar Islands are poorly documented and future systematic surveys including that of deeper reef habitat may help to explore the diversity in the region.

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First report of four deep-sea chondrichthyans (Elasmobranchii and Holocephali) from Andaman waters, India with an updated checklist from the region

Cited by 18 publications

References 17 publications

Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

Catch composition and life history characteristics of sharks and rays (Elasmobranchii) landed in the Andaman and Nicobar Islands, India

Fifteen new records of Batoids (Elasmobranchii) from waters off Andaman and Nicobar Islands, India

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