Population Biology of Spotted Sardinella (Amblygaster sirm Walbaum, 1792) Landed at the Pekalongan Nusantara Fishing Port
DOI:
https://doi.org/10.33394/bioscientist.v14i3.18809Keywords:
Negative allometric growth, spotted sardinella, population biology, Pekalongan, WPPNRI 713Abstract
This study aimed to analyze key aspects of the population biology of spotted sardinella (Amblygaster sirm), including length-frequency distribution, sex ratio, growth pattern, and condition factor. An observational approach was employed using fish samples obtained from commercial landings at a fishing port. The specimens were caught by mini purse-seine vessels operating in Fisheries Management Area of the Republic of Indonesia (WPPNRI) 713 and landed at the Pekalongan Nusantara Fishing Port between July and October 2025. A total of 605 individuals were examined, comprising 337 males and 268 females. The chi-square test indicated a significantly unbalanced sex ratio, with a calculated χ² value of 27.4 compared with a critical χ² value of 7.81 (df = 3; p = 4.85). Total length ranged from 14.8 to 25.7 cm. Both males and females exhibited negative allometric growth, with R² values of 0.805 and 0.835, respectively. The mean condition factor was 0.9803, reflecting a relatively slender body form consistent with the observed negative allometric growth pattern. Overall, these findings provide baseline information on the population biology of A. sirm that may support future assessments and inform sustainable fisheries management.
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Copyright (c) 2026 Ahmad Naufal Attaqi, Muslih, Irfan Hanifa, Jati Suryo Kusumo, Dinda Nur Azza, Indah Nur'aini, Muhamad Naimullah
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