Dynamic spatial allocation of scalloped spiny lobster (Panulirus homarus) in the coast of Gunungkidul, Indonesia

Abstract

The Scalloped Spiny Lobster (Panulirus homarus) is the most caught species of the genus Panulirus in the coastal waters of Gunungkidul. As a result of the high economic value of this species, its catch rate continues to increase. The management of lobster fishery is less precise when using conventional bioeconomic models due to several things, among others are the distribution of its stock is spread according to spatial distribution, low levels of fish resource mobility and the tendency to be biased if the spatial aspects are not taken into account. Growth, mortality, and recruitment parameters are also highly dependent on environmental conditions albeit within a small distance. A spatial bioeconomic approach was carried out to assess a utilization optimization model, by taking into account the biological, ecological, and economic characteristics of this species' capture. This research was carried out in six lobster landing locations in Gunungkidul District, Yogyakarta, Indonesia. Catchability, fuel price, selling price, total cost, and total revenue from each lobster landing locations were identified to determine the dynamic spatial allocation of fishing effort. We found that the capture of P. homarus in four lobster landing locations (Gesing, Ngerenehan, Siung, and Sadeng) can be optimized during peak catch seasons, while in Gesing and Siung can be optimized during catch drought seasons.