Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India

Subramanian Anbuselvan; Vengatesan Sanjaikumar; Gothandapani Jana; Surendran Nabisha; Anandanatesan Arundathy; Govindharaj Thirupathi; Balaji Srihari; Ezhilmaran Shamkumar; Muthusamy Thangaraj

doi:10.3153/AR26023

EN

Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India

Abstract

Seasonal variation in growth and condition of Neotrapezium sublaevigatum was investigated in the Vellar estuary from August 2024 to July 2025. A total of 926 individuals were examined to evaluate shell morphometry, length–weight relationships, size–frequency distribution, and condition indices across pre-monsoon, monsoon, and post-monsoon seasons. Shell length ranged from 4.70 to 41.10 mm, with the highest mean length and weight recorded during the pre-monsoon. Length–weight analysis revealed consistent negative allometric growth (b = 2.5299–2.7875; p < 0.05) in all seasons, indicating that shell length increased proportionally faster than biomass. Stronger morphometric correlations were observed during the monsoon (r² up to 0.9164), suggesting enhanced growth consistency under nutrient-enriched conditions. Size–frequency distribution showed dominance of the 16.0–20.9 mm size class, with peak abundance during the monsoon, reflecting active recruitment and favorable growth conditions. Condition indices exhibited clear seasonal trends, with higher relative condition (Kn) during the monsoon and elevated Fulton’s condition factor (K) during the post-monsoon, indicating dynamic energy allocation in response to environmental variability. The bivalve, N. sublaevigatum, demonstrates adaptive growth strategies characteristic of tropical estuarine bivalves, with population structure and physiological status closely linked to monsoon-driven hydrological cycles. These findings provide baseline ecological information for future monitoring and management of estuarine bivalve populations.

Keywords

Ethical Statement

The authors declare that this study does not involve experiments with human or animal subjects, and therefore, ethics committee approval is not required.

Thanks

The authors are highly grateful to the Authorities of Annamalai University for providing facilities and encouragement.

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Details

Primary Language

English

Subjects

Aquaculture and Fisheries Stock Assessment

Journal Section

Research Article

Authors

Subramanian Anbuselvan
0009-0001-1137-7546
India

Vengatesan Sanjaikumar
0009-0008-9440-1708
India

Gothandapani Jana
0009-0005-3286-7711
India

Surendran Nabisha
0009-0007-6222-8050
India

Anandanatesan Arundathy
0009-0008-0665-1038
India

Govindharaj Thirupathi
0009-0000-1518-7734
India

Balaji Srihari
0009-0009-8694-3491
India

Ezhilmaran Shamkumar
0009-0000-1480-2272
India

Muthusamy Thangaraj ^*
0000-0001-6055-4900
India

Early Pub Date

September 8, 2026

Publication Date

-

Submission Date

March 6, 2026

Acceptance Date

June 5, 2026

Published in Issue

Year 2026 Number: Advanced Online Publication

DOI

https://doi.org/10.3153/AR26023

IZ

https://izlik.org/JA68ZT47AU

Cite

RIS / Bibtex

APA

Anbuselvan, S., Sanjaikumar, V., Jana, G., Nabisha, S., Arundathy, A., Thirupathi, G., Srihari, B., Shamkumar, E., & Thangaraj, M. (2026). Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India. Aquatic Research, Advanced Online Publication, 291-302. https://doi.org/10.3153/AR26023

AMA

1.Anbuselvan S, Sanjaikumar V, Jana G, et al. Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India. Aquat Res. 2026;(Advanced Online Publication):291-302. doi:10.3153/AR26023

Chicago

Anbuselvan, Subramanian, Vengatesan Sanjaikumar, Gothandapani Jana, et al. 2026. “Population Structure, Temporal Allometry Status of Neotrapezium Sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar Estuary, India”. Aquatic Research, no. Advanced Online Publication: 291-302. https://doi.org/10.3153/AR26023.

EndNote

Anbuselvan S, Sanjaikumar V, Jana G, Nabisha S, Arundathy A, Thirupathi G, Srihari B, Shamkumar E, Thangaraj M (September 1, 2026) Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India. Aquatic Research Advanced Online Publication 291–302.

IEEE

[1]S. Anbuselvan et al., “Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India”, Aquat Res, no. Advanced Online Publication, pp. 291–302, Sept. 2026, doi: 10.3153/AR26023.

ISNAD

Anbuselvan, Subramanian - Sanjaikumar, Vengatesan - Jana, Gothandapani - Nabisha, Surendran - Arundathy, Anandanatesan - Thirupathi, Govindharaj - Srihari, Balaji - Shamkumar, Ezhilmaran - Thangaraj, Muthusamy. “Population Structure, Temporal Allometry Status of Neotrapezium Sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar Estuary, India”. Aquatic Research. Advanced Online Publication (September 1, 2026): 291-302. https://doi.org/10.3153/AR26023.

JAMA

1.Anbuselvan S, Sanjaikumar V, Jana G, Nabisha S, Arundathy A, Thirupathi G, Srihari B, Shamkumar E, Thangaraj M. Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India. Aquat Res. 2026;:291–302.

MLA

Anbuselvan, Subramanian, et al. “Population Structure, Temporal Allometry Status of Neotrapezium Sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar Estuary, India”. Aquatic Research, no. Advanced Online Publication, Sept. 2026, pp. 291-02, doi:10.3153/AR26023.

Vancouver

1.Subramanian Anbuselvan, Vengatesan Sanjaikumar, Gothandapani Jana, Surendran Nabisha, Anandanatesan Arundathy, Govindharaj Thirupathi, Balaji Srihari, Ezhilmaran Shamkumar, Muthusamy Thangaraj. Population structure, temporal allometry status of Neotrapezium sublaevigatum (Lamarck, 1819) (Family: Trapezidae) in the Vellar estuary, India. Aquat Res. 2026 Sep. 1;(Advanced Online Publication):291-302. doi:10.3153/AR26023