Perkembangan Gonad Dan Musim Pemijahan Kerang Sepetang (Pharella Acutidens) Di Ekosistem Mangrove Dumai, Riau

This research aims to study the gonadal development and spawning seasonof “sepetang” clam (Pharella acutidens).The study was carried out over 12 month period from November 2010 to October 2011 at Dumai mangrove ecosystem.“Sepetang” clam samples were obtained from the Dumai mangrove ecosystem monthly at three station. The clam collected from plot 1 x 1 m2on quadrat transect. Reproductive aspects such as sex ratio, gonadal development,gonadosomatic index (GSI), and oocytes diameter were studied.The result showed that “sepetang” clam can be sexed at the size more than 35 mm. No specimens hermaphroditism was observed. The male to female ratio was 1 : 1.12. Histological analysis indicated that P. acutidenshadfour distinguishable gonad development in male and female clam, namely early active, late active, ripe and partially spawned. Mean oocyte diameter did not showed pattern monthly, except onMay to July, mean oocyte diameter small. Based on gonadal development, GSI and mean oocytes diameter, “sepetang” clam spawning continued throughout the year and peak spawning season my be on May-July. Keywords : “sepetang” clam, histological, sex ratio, gonadosomatic inde

Sustainability Analysis of Mangrove Ecosystem for Ecofisherytourism in Sidoarjo Lumpur Island

Sidoarjo Lumpur Island is an artificial island created as a solution to the handling of sediment deposition in Porong River Estuary as a result of the mudflow which flowed into the sea via the Porong River. Lumpur Island is currently utilized as a habitat for mangrove ecosystem extension as well as a site for aquaculture with wanamina system (silvofishery). Ecofisherytourism is a way to utilize mangrove ecosystem for ponds silvofishery based on educational and economic approach to achieve the welfare of society. In addition, ecofisherytourism has a direct benefit of preserving nature and the environment. The research objective was to evaluate the condition of the mangrove ecosystem and analyze the physical condition of the Sidoarjo Lumpur Island as a reference in developing the island as ecofisherytourism region. The methods used were a combination of quantitative and qualitative methods. Data were collected through analysis of aerial photographs, field measurements, observation and documentation. Mangrove ecosystem conditions in Lumpur Island was classified as good to be utilized as ecotourism and fisherytourism . The highest elevation of the island is the tidal zone where mangroves grow well

Association of Lokan Shell Geloina Erosa, Solander 1786 and Mangrove at Kahyapu Coastal Area of Enggano Island, Bengkulu Province

Lokan shell Geloina erosa closely related to mangrove ecosystem in Enggano island. Mangrove is one supplier of organic materials required by Lokan shell. The research conducted in September 2015 - January 2016 at mangrove ecosystems in Kahyapu coastal area, aims to analyse lokan shells Geloina erosa conditions and its association with mangrove ecosystems. Sampling of mangrove vegetation was taken using line transect and lokan shell sampling using plot in mangrove ecosystem. The results show that mangrove condition of the Kahyapu coastal area was in healthy condition for the growth of lokan shell. Lokan shell are significantly assosiated with mangrove in Kahyapu coastal area of Enggano Island

Population Structure And Morphometry Of Horseshoe Crab Carcinoscorpius Rotundicauda, Latreille 1802 In Kampung Gisi Coastal Area Of Bintan Bay Of Riau Islands Province

Horseshoe crab, Carcinoscorpius rotundicauda is frequently found in the coastal zone of Bintan Bay of Riau Islands Province. The study was conducted from August to September 2016 in coastal area of Kampung Gisi, Bintan bay. The aims of the study were to analyse the population structure and morphometric characters of horseshoe crab and its relation to the coastal environmental characteristics. Sampling of horseshoe crab was taken using belt transect method, and coastal environmental parameters were measured in-situ. The results show that b values of length-weight relationship were found to be 3.3 (male) and 2.6 (female) respectively. Furthermore, the growth pattern of males were positive allometric, and females were negative allometric. Horseshoe crab are closely related to sandy mudflats sediment, brackish water salinity and mangrove habitat distribution

Karakter Morfometrik Dan Asosiasi Tuna Sirip Kuning Thunnus Albacares Dan Tuna Bambulo Gymnosarda Unicolor (Ruppell) Di Perairan Simeulue, Provinsi Aceh

Pulau Simeulue yang dikelilingi oleh terumbu tepi, secara geografis termasuk ke dalam wilayah Kabupaten Simeulue yang berbatasan langsung dengan Samudera Hindia. Tuna sirip kuning Thunnus albacares dan tuna bambulo Gymnosarda unicolor merupakan jenis epipelagik yang potensial di perairan Simeulue. Kedua jenis tuna ini belum banyak dipelajari karakter bio-ekologinya. Penelitian ini penting dilakukan untuk mengetahui karakter morfometrik dan mengkaji asosiasi spesifik tuna di perairan Simeulue. Penelitian dilakukan pada bulan Februari 2017, dengan metode pengamatan dan pengukuran langsung tuna hasil tangkapan nelayan yang menggunakan alat tangkap pancing ulur, dan selanjutnya dianalisis dengan menggunakan analisis komponen utama (principal component analysis) dan analisis cluster. Hasil tangkapan tuna sirip kuning sebanyak 85 ekor dengan kelas ukuran 35-105 cm dan sebanyak 189 ekor tuna bambulo dengan kelas ukuran 40-110 cm. Karakter morfometrik tuna sirip kuning dan tuna bambulo yang didominasi ukuran besar terdapat di stasiun Teupah Selatan, dan dominasi ukuran kecil di stasiun Simeulue Timur. Asosiasi spesifik tuna sirip kuning dan tuna bambulo pada tingkat similaritas 80,0% membentuk 3 (tiga) kelompok

Karakteristik Perairan Mangrove Tanjung Api-api Sumatera Selatan Berdasarkan Sebaran Parameter Lingkungan Perairan Dengan Menggunakan Analisis Komponen Utama (PCA)

Mangrove ecosystem is a unique ecosystem in coastal area and has useful economic and ecological function. The aim of this research was to know the characteristic of mangrove water of Tanjung Api-api, South Sumatera based on its environmental paramaters. This research has been done in April-June 2007. Sample of water was collected by using water sampler. Water parameters were measured consist of temperature, salinity, pH, Dissolved Oxygen, Nitrate, Phosphate, Ammonium, Total Suspended Solid and Total Organic Matter. Principal Component Analysis was used to determine characteristic of physico-chemical parameters between observation stations. The results showed that station I (sea area) was characterized by high value for temperature, dissolved oxygen, and pH; station II (mouth river) was characterized by high value of TOM and TSS; while station III (river) was characterized by low value of environmental parameters compared with the other stations. Keywords : Environmental parameters, Principal Component Analysis, Mangrove, Tanjung Api-api Ekosistem mangrove merupakan salah satu bentuk ekosistem pesisir yang unik dan memiliki fungsi ekologis dan ekonomis yang sangat bermanfaat di lingkungan pesisir. Penelitian ini bertujuan untuk mengetahui karakteristik habitat mangrove Tanjung Api-api berdasarkan parameter kualitas perairan. Penelitian ini dilakukan pada bulan april-Juni 2007. Pengambilan sampel air dengan menggunakan water sampler lalu dimasukkan kedalam botol gelap. Parameter air yang diamati meliputi suhu, salinitas, pH, oksigen terlarut, nitrat, fosfat, Ammonia, Total Padatan Tersuspensi dan bahan organik total. Untuk menentukan variasi karakteristik fisika kimia perairan antar stasiun pengamatan digunakan Principal Component Analysis atau PCA. Hasil penelitian menunjukkan bahwa karakteristik perairan mangrove Tanjung Api-api untuk Stasiun I (daerah laut) dicirikan oleh suhu, salinitas, DO dan pH yang tinggi, Stasiun II (mulut muara) lebih dicirikan oleh nilai TOM dan TSS yang tinggi, sedangkan Stasiun III (sungai) dicirikan oleh parameter fisika-kimia air dengan nilai yang lebih rendah dibandingkan dengan stasiun-stasiun yang berada di daerah laut dan muara

Struktur Komunitas Ikan Target di Terumbu Karang Pulau Hogow dan Putus-putus Sulawesi Utara

Community structure of target fishes was analyzed to understand their response to different conditions of coral reefs in several places of Hugow and Putus-Putus islands. This study focused on species abundance and diversity including Shannon-Wiener's species diversity (H'), species richness (SR), species evenness (J') and dominance (d) indices, respectively. A multivariate analysis was used for the classification or correspondence factorial analyses. The result recorded 4,501 individuals belonging to 52 species of target fishes. Both cluster and correspondence analyses clearly recognized 3 groups of target fish with 2 major controlling factors for the development of these 3 ecological groups, i.e. coral reef conditions and geographic position to the hydrodynamic condition

Shallow-water Habitat Change Detection of Kaledupa Island, Wakatobi National Park (Wnp) for 14 Years

Metode penginderaan jauh sangat membantu dalam pemetaan kondisi habitat perairan dangkal secara spasial pada cakupan area yang luas. Penelitian ini bertujuan untuk menganalisis Perubahan habitat perairan dangkal Pulau Kaledupa, Taman Nasional Wakatobi (TNW), selama 14 tahun, dari tahun 2002 hingga 2016. Data citra yang digunakan dalam penelitian ini adalah Landsat 8 OLI (2016), Landsat 5TM (2009), dan Landsat 7ETM+ (2002), yang dikombinasikan dengan data in-situ dan TNW. Klasifikasi Mahalanobis dimanfaatkan untuk memproduksi peta habitat perairan dangkal (karang hidup, karang mati, lamun, dan pasir) dan mendeteksi Perubahannya. Hasil yang diperoleh bahwa Perubahan yang terjadi dari tahun 2002 sampai 2016 adalah tutupan karang hidup menurun dari 2217 ha menjadi 2039 ha, tutupan karang mati juga menurun dari 3327 ha menjadi 2108 ha, luas pasir meningkat dari 1201 ha menjadi 1346 ha, area lamun naik dari 4130 ha menjadi 5294 ha. Metode ini merupakan alat analisis yang baik untuk menilai efektivitas upaya perlindungan ekosistem terumbu karang dan lamun di perairan Pulau Kaledupa, serta dapat diterapkan pada 3 pulau utama lainnya di TNW dan pulau-pulau kecil di Indonesia