Size Structure and Growth Pattern of Octopus cyanea in Seruni Mumbul Waters, East Lombok District, Indonesia

Abstract

The waters surrounding Seruni Mumbul Village, East Lombok Regency are a region with potential for the stone octopus (Octopus cyanea) fishery. This study aimed to analyze the distribution of dorsal mantle length (DML), body weight, and growth patterns of Octopus cyanea. Research was conducted from April to August 2025 at two main landing sites: Segare Harapan Jaya Cooperative and the collector in Dusun Kampung Mandar, Seruni Mumbul Village, Pringgabaya Subdistrict, East Lombok Regency, West Nusa Tenggara (WNT) Province. Data were collected daily in situ using a total landing census method, in which all landed individuals were measured without selection to obtain morphometric data, including dorsal mantle length (DML), body weight, and sex determination. Data analysis included the distribution of mantle length, body weight, and the length–weight relationship. A total of 467 individuals were recorded during the study period. The population was generally dominated by small to medium-sized individuals, indicating ongoing recruitment and active growth. The length–weight relationship showed negative allometric growth in both sexes, suggesting that mantle length increased proportionally faster than body weight. These findings provide baseline biological information that can support sustainable fishery management, including the formulation of minimum catch size regulations and local conservation strategies.