Scholarlink

<p>Chondrichthyans belonging to 73 different species and two subclasses (elasmobranchii and holocephali) were identified during 100 days of field visits from fishery-dependent observations conducted across 16 harbors (8 from each coast) and eight coastal states in India. An equivalent effort in terms of days was invested (n = 50 days) on each coast, totalling 100 days. We identified eight orders, 23 families, and 40 genera within subclass elasmobranchii and only one species from holocephali. 32 species were observed within the super-order selachimorpha and 40 within the batoidea. Batoid species belonging to the genera glaucostegus, rhinobatos, rhinoptera, and pateobatis preferred near-shore estuarine habitats, while sharks like carcharhinus sp. and mobulid sp. preferred deeper shore waters. A high percentage of juvenile elasmobranchs were observed from West Bengal and Orissa on the east coast, highlighting indiscriminate fishing practices. The west coast of India (57 species, H-index = 2.562, Evenness = 0.625) is more diverse than the east (47 species, H-index = 1.817, Evenness = 0.472). There is a substantial difference between the coasts determined from the Chi-Square (9206.95) test, while the Bray–Curtis (0.624367521) value quantifies the difference between both coasts. The current IUCN status reveals that 12% of species are critically endangered (Ce), 24% are endangered (Ed), 34% are vulnerable (Vu), 15% are near threatened (Nt), 7% are least concern (Lc), 3% not evaluated (Ne), and 1% data deficient (Dd). The absence of many species with severely plummeting numbers in others highlights the requirement of renewed and urgent conservation efforts to prevent local extinctions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Exploring the elasmobranch diversity, distribution, and conservation status: a comparative study of India’s west and east coast with insights into commercial cathches

  • 期刊论文

  • 发表日期：

    2025年12月29日

查看全文
  • Sourav Chattopadhyay,
  • R. Kumaran,
  • Anagha Bijo,
  • Jitesh B. Solanki,
  • Ragul Sivakumar,
  • Ezhil Padmakumar

摘要

Chondrichthyans belonging to 73 different species and two subclasses (elasmobranchii and holocephali) were identified during 100 days of field visits from fishery-dependent observations conducted across 16 harbors (8 from each coast) and eight coastal states in India. An equivalent effort in terms of days was invested (n = 50 days) on each coast, totalling 100 days. We identified eight orders, 23 families, and 40 genera within subclass elasmobranchii and only one species from holocephali. 32 species were observed within the super-order selachimorpha and 40 within the batoidea. Batoid species belonging to the genera glaucostegus, rhinobatos, rhinoptera, and pateobatis preferred near-shore estuarine habitats, while sharks like carcharhinus sp. and mobulid sp. preferred deeper shore waters. A high percentage of juvenile elasmobranchs were observed from West Bengal and Orissa on the east coast, highlighting indiscriminate fishing practices. The west coast of India (57 species, H-index = 2.562, Evenness = 0.625) is more diverse than the east (47 species, H-index = 1.817, Evenness = 0.472). There is a substantial difference between the coasts determined from the Chi-Square (9206.95) test, while the Bray–Curtis (0.624367521) value quantifies the difference between both coasts. The current IUCN status reveals that 12% of species are critically endangered (Ce), 24% are endangered (Ed), 34% are vulnerable (Vu), 15% are near threatened (Nt), 7% are least concern (Lc), 3% not evaluated (Ne), and 1% data deficient (Dd). The absence of many species with severely plummeting numbers in others highlights the requirement of renewed and urgent conservation efforts to prevent local extinctions.