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Produksi nasional kepiting bakau yang terus menurun serta semakin sulitnya nelayan menangkap kepiting bakau di habitat aslinya, menjadi indikator terjadinya ancaman keberlanjutan sumberdaya di alam. Kepiting bakau ( Scylla serrata ) merupakan salah satu komoditas perikanan penting propinsi Kalimantan Timur, yang sebagian besar berasal dari hasil tangkapan nelayan di sekitar perairan Delta Mahakam. Informasi status stok kepiting bakau di Estuari Mahakam belum tersedia sehingga menjadi kendala dalam menyusun kebijakan pengelolaan sumberdaya kepiting bakau pada skala daerah dan nasional. Penelitian ini dimaksudkan untuk mengetahui status stok kepiting bakau di Estuari Mahakam dengan menggunakan metode rasio potensi pemijahan induk berbasis data panjang ( Length-Based Spawning Potential ratio /SPR), dalam kurun waktu 5 bulan, yaitu November 2016-Maret 2017. Hasil analisis menunjukkan bahwa nilai SPR saat ini ( actual estimate ) diperoleh sebesar 0,43 atau sebesar 43% sehingga dikategorikan sebagai fully-moderate exploited karena masih berada di atas ambang batas yang telah ditetapkan sebesar 30%. Nilai SPR 43% mengindikasikan bahwa masih terdapat biomassa kepiting bakau dewasa sebesar 43% di alam, untuk menunjang keberlanjutan rekruitmen. Di samping itu, laju penangkapan (F) terhadap mortalitas alami (M) yang mencapai 0,86 menunjukan bahwa kematian alami lebih mendominasi dibandingkan tekanan penangkapan. The decreasing in national production of mangrove crab and the difficulties for fishermen to catch mangrove crab in its natural habitat, become an indicator of the threatened of those resources in nature. Mangrove Crab ( Scylla serrata ) is one of the important fishery commodities of East Kalimantan province, mostly caught around the waters of Mahakam Estuary. Meanwhile, information concerning the stock status of mangrove crab in Mahakam Estuary is not yet available so it becomes an obstacle in formulating policies related to the management of mangrove crab resources at the regional and national scale. This research is intended to know the stock status of mangrove crab (Scylla serrata) in Mahakam Estuary by using Length-Based Spawning Potential ratio (SPR). The result of analysis show that the value of the current SPR (actual estimate) is 0,43 or 43%, it is categorized as fully-moderate exploited because it is still above the predefined threshold of 30%. The SPR value indicates about 43% of mature crabs biomass are still available to support the sustainability of recruitment. Nevertheless, the rate of capture (F) on natural mortality (M) has reached 0,86 which is mean that fishing exploitation has contributed 86% to the mortality of mangrove crab in its habitat.

ESTIMASI STATUS STOK SUMBER DAYA KEPITING BAKAU (Scylla serrata) DI ESTUARI MAHAKAM, KALIMANTAN TIMUR