Biological Characteristics of Red Bigeye (Priacanthus macracanthus Cuvier, 1829) in the Coastal Central Region of Viet Nam

Date Received: 06-06-2025

Date Accepted: 16-09-2025

Date Published: 31-10-2025

##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2025.23.10.06

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Issue: Vol. 23 No. 10 (2025): Tạp chí Khoa học Nông nghiệp Việt Nam

Section:

CHĂN NUÔI – THÚ Y – THỦY SẢN

How to Cite:

Thắng, V. T., & Nhuan, M. (2025). Biological Characteristics of Red Bigeye (Priacanthus macracanthus Cuvier, 1829) in the Coastal Central Region of Viet Nam. Vietnam Journal of Agricultural Sciences, 23(10), 1331–1341. https://doi.org/10.31817/tckhnnvn.2025.23.10.06

Biological Characteristics of Red Bigeye (Priacanthus macracanthus Cuvier, 1829) in the Coastal Central Region of Viet Nam

Võ Trọng Thắng (*) , Mai Cong Nhuan

  • Tác giả liên hệ: [email protected]

    • Keywords

    Red bigeye, biological characteristics, coastal central region of Vietnam

    Abstract


    This study aimed to evaluate the biological characteristics of the red bigeye (Priacanthus macracanthus Cuvier, 1829) in the central coastal region of Vietnam. The biological characteristics were analyzed based on fishery biological data collected in the study area from January to December 2019, involving 1,798 individuals. The results indicated that the total length (TL) distribution ranged from 70 to 273 mm, with an average of 137.9 ± 0.97mm. The total length-body weight relationship was estimated as W = (7.41e – 5) × TL(2.69), with R² = 0.98. The von Bertalanffy growth function of the red bigeye was calculated as TLt = 294 × (1 – e-0.97 × (t – 1.058)). The total mortality rate (Z), fishing mortality rate (F), and natural mortality rate (M) were assessed at 2.94 yr⁻¹, 1.99 yr⁻¹, and 0.94 yr⁻¹, respectively, and the exploitation rate (E) was 0.68. Females were dominant throughout the study period, with a male-to-female ratio of 0.75:1. The red bigeye spawns once a year with the spawning season extending from July to October and peaking in August and September. The estimated length at first maturity (TL₅₀) was 190.9mm. The results indicated that the red bigeye population is dramatically overexploited in the central coastal region of Vietnam.

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