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<p>Length–weight relationships (LWRs) and relative condition factors (<i>Kn</i>) were estimated for 13 commercially important reef-associated fish species collected using bottom-set longlines from three major fishing grounds in the Gulf of Mannar (Keelamundal, Keelakarai and Mandapam), India. In total, 2,472 individuals belonging to the families Lutjanidae (Snapper), Lethrinidae (Emperor), Epinephelidae (Grouper) and Terapontidae (Grunter) were analysed. The allometric coefficient (b) ranged from 2.330 to 3.462, revealing substantial interspecific variation in growth patterns. Positive allometric growth was recorded in seven species, five species exhibited negative allometry, and one species showed isometric growth. Length and weight were strongly correlated across all species (r² = 0.951–0.990). Relative condition factor values were close to or slightly above unity for most species, indicating generally good physiological condition and favourable environmental conditions during the sampling period. Observed differences in growth dynamics likely reflect variation in body morphology, habitat use and depth distribution among reef-associated taxa. This study provides updated, gear-specific and regionally standardised LWR parameters for key reef fishes of the Gulf of Mannar. These estimates constitute essential baseline information for biomass estimation, stock assessment and ecosystem-based fisheries management, thereby supporting the sustainable exploitation of reef fish resources in a region increasingly affected by fishing pressure and environmental change.</p>

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Length–Weight Relationships for Reef Fishes Inhibiting a Tropical Biodiversity Hotspot

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Sathiyanesan Subanesam,
  • Muthupandi Kalaiarasan,
  • Neethirajan Neethiselvan,
  • Natarajan Jayakumar,
  • Vijayamuthu Suryapraba,
  • Lakshme Gayathre,
  • Vinayagamoorthy Naganandhini,
  • Soosaiantony Emiema,
  • Beena Mol,
  • Kalidoss Radhakrishnan

摘要

Length–weight relationships (LWRs) and relative condition factors (Kn) were estimated for 13 commercially important reef-associated fish species collected using bottom-set longlines from three major fishing grounds in the Gulf of Mannar (Keelamundal, Keelakarai and Mandapam), India. In total, 2,472 individuals belonging to the families Lutjanidae (Snapper), Lethrinidae (Emperor), Epinephelidae (Grouper) and Terapontidae (Grunter) were analysed. The allometric coefficient (b) ranged from 2.330 to 3.462, revealing substantial interspecific variation in growth patterns. Positive allometric growth was recorded in seven species, five species exhibited negative allometry, and one species showed isometric growth. Length and weight were strongly correlated across all species (r² = 0.951–0.990). Relative condition factor values were close to or slightly above unity for most species, indicating generally good physiological condition and favourable environmental conditions during the sampling period. Observed differences in growth dynamics likely reflect variation in body morphology, habitat use and depth distribution among reef-associated taxa. This study provides updated, gear-specific and regionally standardised LWR parameters for key reef fishes of the Gulf of Mannar. These estimates constitute essential baseline information for biomass estimation, stock assessment and ecosystem-based fisheries management, thereby supporting the sustainable exploitation of reef fish resources in a region increasingly affected by fishing pressure and environmental change.