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<p>The longtail shad (<i>Tenualosa macrura</i>) exhibited a restricted distribution within the Siak River estuary, particularly in the Bengkalis, Padang and Lalang Straits ecosystems. As an anadromous pelagic-neritic species, it is highly vulnerable to ENSO (El Niño Southern Oscillation) and IOD (Indian Ocean Dipole) climate anomalies, which might influence its spawning habitat. Using hydroacoustic and oceanographic data from El Niño (2015) and La Niña (2016) years, we found that these anomalies impacted oceanographic conditions, increasing the abundance of phytoplankton and zooplankton, and altering fish distribution and size. El Niño events correlated with a significant total abundance of <i>T. macrura</i>, exhibiting a mean distribution value of hydro-acoustic measurements of 122 ind./km<sup>2</sup> during El Niño and 16 ind./km<sup>2</sup> during La Niña. However, the proportion of female fish during El Niño decreased by 54%, and the overall fish size was comparatively smaller (mean SL: 21.8&#xa0;cm). The study highlighted a significant correlation (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(P\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>P</mi> </math></EquationSource> </InlineEquation>&lt;0.05) between total catch, fish size, sex ratios, and ENSO events, with smaller fish and fewer females during El Niño. A significant climate anomalies caused shifts in the fishing season, shortening its duration. These findings are vital for managing the sustainability of this overfished and endangered species.</p>

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Climate anomalies reshape abundance distribution and biological parametric of the endemic longtail shad (Tenualosa macrura) in the Siak River Estuary, Indonesia

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Khairul Amri,
  • Tirtadanu Tirtadanu,
  • Supratmi Supratmi,
  • Asep Ma’mun,
  • Asep Priatna,
  • Bram Setyadji,
  • Dwi Ernaningsih,
  • Riena F. Telussa,
  • Urip Rahmani,
  • Supradianto Nugroho,
  • Andri Purwandani,
  • Reny Puspasari,
  • Fajar Kurniawan

摘要

The longtail shad (Tenualosa macrura) exhibited a restricted distribution within the Siak River estuary, particularly in the Bengkalis, Padang and Lalang Straits ecosystems. As an anadromous pelagic-neritic species, it is highly vulnerable to ENSO (El Niño Southern Oscillation) and IOD (Indian Ocean Dipole) climate anomalies, which might influence its spawning habitat. Using hydroacoustic and oceanographic data from El Niño (2015) and La Niña (2016) years, we found that these anomalies impacted oceanographic conditions, increasing the abundance of phytoplankton and zooplankton, and altering fish distribution and size. El Niño events correlated with a significant total abundance of T. macrura, exhibiting a mean distribution value of hydro-acoustic measurements of 122 ind./km2 during El Niño and 16 ind./km2 during La Niña. However, the proportion of female fish during El Niño decreased by 54%, and the overall fish size was comparatively smaller (mean SL: 21.8 cm). The study highlighted a significant correlation ( \(P\) P <0.05) between total catch, fish size, sex ratios, and ENSO events, with smaller fish and fewer females during El Niño. A significant climate anomalies caused shifts in the fishing season, shortening its duration. These findings are vital for managing the sustainability of this overfished and endangered species.