Daniel Julianto. Tarigan, Domu Simbolon, Am Azbas. Taurusman, Mohammad Imron, Tegoeh Noegroho
The big blue octopus (Octopus cyanea) has high economic value, making it vulnerable to overexploitation. On the other hand, this species belongs to a group of fisheries resources with a short, single-generation life cycle. As a result, octopus are highly susceptible to degradation if exploitation levels are high and catches are dominated by individuals that are not biologically mature. The implementation of open-closed fishing areas for octopus in the waters of Kaur indicates a decline or degradation of octopus stocks, highlighting the need to examine size distribution through mantle length and gonadal maturity. The objective of this study was to assess the size distribution of octopus resources in Kaur based on mantle length and gonadal maturity stages. Samples were collected using purposive sampling, with a total of 2,691 individuals measured for mantle length. For gonadal maturity analysis, 330 individuals were randomly selected. The results showed that gonadal maturity stages of male octopuses were dominated by stage II (79%), while females were dominated by stage II (58%). Mature male octopus were captured at a mantle length of 12 cm, while mature females were captured at 14 cm. Males reached gonadal maturity earlier than females, with body weights of 510 g and 730 g, respectively. To ensure the sustainability of O. cyanea stocks, the local government and other stakeholders need to regulate the capture of juveniles and mature octopus during spawning. © 2026, BIOFLUX SRL. All rights reserved.
Study Program of Marine Fisheries Technology, Faculty of Fisheries and Marine Science, Bogor Agricultural University, Agatis Street, No. 1, Dramaga District, West Java, Bogor, 16680, Indonesia; Marine and Fisheries Education Study Program, Universitas Pendidikan Indonesia, Dr. Setiabudhi Street, No. 229, West Java, Bandung, 40154, Indonesia; Department of Fisheries Resources Utilization, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Agatis Street, No. 1, Dramaga District, West Java, Bogor, 16680, Indonesia; Research Center for Fishery, National Research and Innovation Agency, Raya Jakarta-Bogor Street No. 32, Cibinong District, West Java, Bogor, 16915, Indonesia
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