HUBUNGAN LEBAR KARAPAS DAN BERAT KEPITING BAKAU (Scylla spp.) HASIL TANGKAPAN DI DESA KAHYAPU PULAU ENGGANO PROVINSI BENGKULU

Abstract

Informasi biologi perikanan diperlukan untuk mengetahui status suatu komoditas perikanan di alam, terutama untuk komoditas bernilai ekonomis tinggi seperti kepiting bakau. Salah satu daerah penangkapan kepiting bakau di alam adalah Desa Kahyapu, Pulau Enggano, Provinsi Bengkulu. Tujuan penelitian ini adalah untuk mengumpulkan informasi biologi kepiting bakau di Desa Kahyapu, Pulau Enggano, khususnya informasi mengenai hubungan lebar karapas dan berat kepiting bakau. Sampel kepiting bakau (jantan dan betina) dari hutan mangrove di Desa Kahyapu, Pulau Enggano. Penelitian ini menggunakan 3 stasiun pengamatan, setiap statiun dibagi menjadi 3 transek garis dengan masing-masing 3 plot (ukuran 10x10 m) tiap transek garis. Tiap plot dipasang bubu sebanyak 3 buah selama 14 hari. Hasil pengamatan menunjukkan bahwa kepiting bakau jantan lebih banyak tertangkap dengan nisbah kelamin jantan dan betina adalah 1: 0,47. Lebar karapas kepiting bakau jantan berkisar antara 70 – 193 mm (67,65% telah dewasa kelamin), sedangkan lebar karapas kepiting bakau betina berkisar antara 83 – 180 mm (93,75% telah dewasa kelamin). Pola pertumbuhan kepiting bakau baik jantan maupun betina adalah allometrik negatif (b < 3).

Kata kunci: berat, Enggano, Kahyapu, karapas, kepiting bakau

THE RELATIONSHIP BETWEEN THE WIDTH OF CARAPACE AND THE WEIGHT OF CAUGHT MANGROVE CRAB (Scylla spp.) IN KAHYAPU VILLAGE, ENGGANO ISLAND, BENGKULU PROVINCE

ABSTRACT

Biological information of fisheries is necessary to know the status of certain fisheries commodity in nature, especially for the high-economical-valued commodity like the mangrove crab. One of natural mangrove crab fishing grounds is Kahyapu Village, Enggano Island, Bengkulu Province. The objective of this research is to collect biological information of mangrove crab in Kahyapu Village, Enggano Island, especially the information about the relationship between the width of carapace and the weight of mangrove crab. The samples of mangrove crab (male and female) were taken from mangrove forest in Kahyapu Village, Enggano Island. This research used 3 observation stations. Each station was divided into 3 line transects each had 3 plots (the size was 10 x 10 m) for each line transect. Each plot was installed by 3 fish traps for 14 days. The observation result showed that the mostly caught were male mangrove crabs, the comparison between the caught male and female mangrove crabs were 1: 0.47. The width of male mangrove crab’s carapaces were about 70 to 193 mm (67.65% were the adult ones), while the width of female mangrove crab’s carapaces were about 83 – 180 mm (93.75% were the adult ones). The growth pattern of both male and female mangrove crabs was negative allometric (b < 3).

Keywords: carapace, Enggano, Kahyapu, mangrove crab, weight