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<p>The red snapper <i>Lutjanus malabaricus</i> is an ecologically and economically important demersal fish widely distributed in the southern coastal waters of Central Java, Indonesia. This study examined <i>L. malabaricus</i> biological traits, catch dynamics, and management aspects to generate key information for sustainable utilisation. Field sampling was carried out from March to July 2022 in Kebumen and Cilacap using bottom longlines. A total of 812 specimens were analysed to determine length-weight relationships, gonadal maturity, fecundity, catch per unit effort (CPUE), and sustainable yield. In Kebumen, the total length (TL) of specimens ranged from 25 to 65&#xa0;cm, with an average of 43.8 ± 6.2&#xa0;cm, dominated by medium-sized individuals that were close to the length at first maturity (Lm<sub>50</sub> ≈ 38&#xa0;cm). By contrast, samples from Cilacap showed a higher mean TL of 46.3 ± 7.5&#xa0;cm, with a greater proportion of mature fish. The length-weight relationship (W = 0.1030*L²·⁴¹⁶⁴, R² = 0.79) indicated a negative allometric growth pattern. Catch per unit effort (CPUE) fluctuated markedly over the past five years, reflecting variations in fishing intensity and environmental conditions. The maximum sustainable yield (MSY) was estimated at 8,663.7&#xa0;kg yr⁻¹, with an exploitation rate of 78%, suggesting that the stock is already fully exploited. These results highlight the urgent need for stronger management measures, such as the enforcement of minimum catch sizes, stricter regulation of fishing effort, and seasonal closures, to secure the long-term sustainability of <i>L. malabaricus</i> fisheries in Central Java.</p>

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Biological Characteristics, Catch Dynamics, and Management Implications of Lutjanus Malabaricus Fisheries in Southern Central Java Waters

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Lilis Rosita Sari,
  • Basuki Rachmad,
  • Mujiyanto,
  • Yayuk Sugianti,
  • Andrias Steward Samusamu,
  • Ngurah N. Wiadnyana

摘要

The red snapper Lutjanus malabaricus is an ecologically and economically important demersal fish widely distributed in the southern coastal waters of Central Java, Indonesia. This study examined L. malabaricus biological traits, catch dynamics, and management aspects to generate key information for sustainable utilisation. Field sampling was carried out from March to July 2022 in Kebumen and Cilacap using bottom longlines. A total of 812 specimens were analysed to determine length-weight relationships, gonadal maturity, fecundity, catch per unit effort (CPUE), and sustainable yield. In Kebumen, the total length (TL) of specimens ranged from 25 to 65 cm, with an average of 43.8 ± 6.2 cm, dominated by medium-sized individuals that were close to the length at first maturity (Lm50 ≈ 38 cm). By contrast, samples from Cilacap showed a higher mean TL of 46.3 ± 7.5 cm, with a greater proportion of mature fish. The length-weight relationship (W = 0.1030*L²·⁴¹⁶⁴, R² = 0.79) indicated a negative allometric growth pattern. Catch per unit effort (CPUE) fluctuated markedly over the past five years, reflecting variations in fishing intensity and environmental conditions. The maximum sustainable yield (MSY) was estimated at 8,663.7 kg yr⁻¹, with an exploitation rate of 78%, suggesting that the stock is already fully exploited. These results highlight the urgent need for stronger management measures, such as the enforcement of minimum catch sizes, stricter regulation of fishing effort, and seasonal closures, to secure the long-term sustainability of L. malabaricus fisheries in Central Java.