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Journal of Marine Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 24077690     DOI : 10.14710/jmr.v9i4.28340
Core Subject : Science,
The Journal of Tropical Fisheries Management is managed by the Department of Water Resource Management, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University aims to publish the results of basic, applied research in the scope of fisheries resources, fish stock studies, and population dynamics, fish biodiversity, fisheries technology, industrialization and fish trade, fisheries management, and fisheries development policies in the tropics, especially Indonesia. The scope of the area includes: Marine Fisheries Coastal Fisheries Inland Fisheries The focus and scope of this publication are expected to contribute thoughts for the government to strengthen the science of fisheries management
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Articles 687 Documents
Studi Kandungan Logam Berat Tembaga (Cu) pada Air, Sedimen, dan Kerang Darah (Anadara granosa) di Perairan Sungai Sayung dan Sungai Gonjol, Kecamatan Sayung, Kabupaten Demak Cahyani, Maryuli Dyah; Nuraini, Ria Azizah Tri; Yulianto, Bambang
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.2 KB) | DOI: 10.14710/jmr.v1i2.2022

Abstract

Study of copper (Cu) content in water, sediment, and Blood Clam (Anadara granosa) was conducted in coastal waters of Bedono, District Sayung, Demak district in 2010 and 2011. This study was done because coastal waters of Bedono (such as rivers and river Sayung Gonjol) functioned as the disposal trajectory by the industrial area located along the highway Semarang - Demak. This study aimed to analyze the heavy metal content of Cu in coastal waters and Rivers Sayung and River Gonjol, District Sayung, Demak. The study was conducted during low tide conditions (in 2010) and high tides (in 2011). The results showed that in 2010, the copper content in water of River Sayung ranged from 0.003 to 0.056 mg/l, whereas in the River Gonjol, copper content ranged from not detected - 0.026 mg/l. In 2011, copper content in water is not detected, either in the River Sayung and in the River Gonjol. Copper content in the sediment of River Sayung ranged from 4.89 to 28.75 mg/kg, and in River Gonjol from 18.77 to 71.28 mg/kg (in 2010). In 2011, copper content in the sediment of mouth of River Sayung ranged from 16.1 to 25.57 mg/kg, and in the mouth of River Gonjol ranged from 16.69 to 52.72 mg/kg. In 2010, copper content in the soft tissues of the blood clam in the mouth of River Sayung was 29.86 mg/kg, and at 31.2 mg/kg in the mouth of River Gonjol. Meanwhile, in 2011, copper content was not detected in blood clams. Overall, copper content in water, sediment, and blood clams were still below the threshold quality standard set by each authority.
KESESUAIAN PERAIRAN UNTUK WISATA SELAM DAN SNORKELING DI PULAU BIAWAK, KABUPATEN INDRAMAYU J., Oscar Leonard; Pratikto, Ibnu; Munasik, Munasik
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1325.829 KB) | DOI: 10.14710/jmr.v3i3.5993

Abstract

Pulau Biawak, Kabupaten Indramayu merupakan kawasan yang memiliki potensi untuk wisata selam dan snorkeling, sehingga perlu dilakukan studi kesesuaian dan daya dukung kawasan. Penelitian ini bertujuan untuk mengetahui potensi ekosistem terumbukarang dan tingkat kesesuaian untuk wisata selam dan snorkeling. Metode yang digunakan adalah deskriptif kuantitatif. Hasil studi menunjukkan lokasi yang berpotensi untuk wisata selam adalah stasiun 1 (S2), 3 (S2), 5 (S1) dan 7 (S1). Hasil studi untuk wisata snorkeling menunjukkan terdapat tiga stasiun yang sangat sesuai (S1) yaitu stasiun 2, 6 dan 8, sedangkan stasiun 4 termasuk kategori cukup sesuai (S2). Daya Dukung Kawasan untuk wisata selam mendapatkan hasil seluas ±18.499 m2 sebanyak 74 orang/hari dengan daya dukung pemanfaatan ±7 orang/hari. Daya Dukung Kawasan untuk wisata snorkeling didapatkan luas area sebesar ±228.811 m2 sebanyak 915 orang/hari dengan Daya Dukung Pemanfaatan ±91 orang/hari.
Pengaruh Konsentrasi KOH yang Berbeda Terhadap Kualitas Alginat Rumput Laut Coklat Sargassum duplicatum J. G. Agardh Anwar, Fauzi; Djunaedi, Ali; Santosa, Gunawan Widi
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.292 KB) | DOI: 10.14710/jmr.v2i1.2049

Abstract

Indonesia has plentiful resources and high biological diversity. One of them is brown seaweed Sargassum duplicatum which has potential as source for alginate. Alginate is often used in food and other industry, however extraction method is still becoming handycap to get high quality alginate. The objective of research was to know the effect of different concentration of soaking media KOH on quality of alginate. The method used was laboratory experiment. Design experiment applied was Completely Randomized Design (CRD) with three different concentrations of KOH, namely 0.3%, 0.5%, and 0.7%. Each treatment was repeated three times. The result showed that the highest yield was obtained at 0.3% KOH concentration at 33.63 ± 2.11%. The highest viscosity was obtained at 0.7% KOH concentration at 23.33 ± 2.08 cPs. The lowest water content was obtained at 0.7% KOH concentration at 14.71 ± 0.32%. The ashes content was obtained at 0.7% KOH concentration at 27.82 ± 0.88%.
Kesesuaian Lahan Sebagai Ekowisata Bahari Di Pantai Tanjung Natuna Akhmad, Dhanar Syahrizal; Koesoemadji, Koesoemadji; Pratikto, Ibnu
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (302.532 KB) | DOI: 10.14710/jmr.v3i4.8363

Abstract

Dalam Rencana induk Pengembangan Pariwisata Daerah tahun 2010–2030, Kabupaten Natuna diarahkan pada pengembangan wisata bahari dan wisata minat khusus. Pantai Tanjung yang masih alami dan letak geografis Natuna yang merupakan salah satu pulau paling utara Indonesia di Laut Tiongkok Selatan,dengan pengelolaan yang baik maka mempunyai potensi sebagai kawasan ekowisata. Tujuan dari penelitian ini adalah untuk mengetahui kesesuaian lahan dan daya dukung kawasan untuk kegiatan ekowisata di Pantai Tanjung.Penelitian ini dilaksanakan di wilayah Pantai Tanjung, pada Januari sampai Februari 2013. Metode yang digunakan dalam penelitian ini bersifat deskriptif, dengan survey lapangan. Pengolahan data menggunakan baku mutu kualitas air laut untuk wisata bahari, matriks kesesuaian lahan, serta matriks daya dukung kawasan terhadap kepadatan pengunjung. Hasil penelitian berdasarkan hasil perhitungan dari matriks kesesuaian lahan, untuk wisata pantai kategori rekreasi memiliki kelas kesesuaian wisata kategori S1 (sangat sesuai), wisata bahari kategori snorkeling memiliki kelas kesesuaian wisata kategori S1 (sangat sesuai), wisata bahari kategori menyelam mempunyai kelas kesesuaian wisata kategori S2 (cukup sesuai),Sedangkan daya dukung Pantai Tanjung terhadap kepadatan pengunjung setiap harinya sebanyak 6748 orang dimana untuk rekreasi pantai adalah 68 orang, berenang 136 orang berjemur 272 orang, selam 2000 orang, Snorkeling 4000 orang, berperahu 272 orang.
Aspek Morfometri Dan Tingkat Kematangan Gonad Rajungan (Portunus pelagicus) Linnaeus, 1758 (Malacostraca:Portunidae) di Perairan Betahwalang Demak Tharieq, Muhammad Amanun; Sunaryo, Sunaryo; Santoso, Adi
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (735.944 KB) | DOI: 10.14710/jmr.v9i1.26081

Abstract

ABSTRAK: Rajungan (P. pelagicus, Linnaeus, 1758) adalah salah satu hasil perikanan utama di Betahwalang, Demak. Penangkapan rajungan diduga dilakukan secara intensif oleh nelayan di Des Betahwalang, maka diperlukan langkah pengelolaan yang tepat untuk menjaga kelestarian dan konservasi rajungan. Informasi aspek morfometri rajungan bias digunakan sebagai salah satu acuan dalam pengelolaan rajungan berkelanjutan. Tujuan penelitian adalah untuk mengkaji tingkat kematangan gonad dan morfometri rajungan yang dilaksanakan pada bulan Juli – September 2019 di Desa Betahwalang, Demak. Penelitian menggunakan metode survey dengan analisis yang bersifat deskriptif yang dilakukan secara “time-series”. Pengamatan sampel rajungan sebesar 10% dari hasil tangkapan yang didaratkan oleh setiap nelayan di pengepul rajungan. Total rajungan yang diamati 5.480 ekor terdiri dari betina 2.960 ekor dan jantan 2.388 ekor. Hasil penelitian menunjukkan pertumbuhan rajungan jantan bersifat allometrik positif, sedangkan rajungan betina cenderung bersifat allometrik negatif dengan seks rasio relatif seimbang. Rajungan betina diduga mengalami pertama kali matang gonad pada selang kelas lebar karapas 70 – 79 mm. Sampel pengamatan fekunditas dan kematangan telur pada 126 ekor rajungan betina bertelur. Kematangan telur dilihat dari pigmen warnanya secara berurutan mulai pigmen warna kuning, orange, coklat dan hitam, serta berdasarkan ukuran diameter telur. Fekunditas telur memiliki korelasi yang sangat kuat terhadap lebar karapas yang berarti semakin besar ukuran rajungan, maka jumlah telur semakin banyak. Selama penelitian masih ditemukan rajungan “undersize” sebesar 18% (981 ekor) dan rajungan betina bertelur sebesar 24% (716 ekor), yang berarti nelayan di Desa Betahwalang belum menerapkan kriteria dan ukuran layak tangkap sesuai dengan peraturan yang berlaku.ABSTRACT: Blue swimming crab (P. pelagicus, Linnaeus, 1758) is one of main fisheries products in Betahwalang, Demak. High-intensity levels of catching the blue swimmer crab by fisherman may need sustainable management to protect and conserve the population. The purpose of this study was to determine about gonad maturity level and morphometrical aspect of blue swimming crab started from July – September 2019. There’s a descriptive survey method used in this study with time-series observations. The sample size is about 10% of the total number landed crab from each fisherman. The total sample are 5.348 that consist of 2.960 female crabs and 2.388 male crabs. The results showed the male crabs has a positive allometric on growth parameters, but the females have an allometric positive and negative growth parameters, and balanced sex-ratio. Female crabs may reach the first matured gonad level between 70 – 79 mm of carapace width. Fecundity and egg’s maturity observation used 126 berried female crabs. The egg’s maturity based on the pigment color started from yellow, became orange, brown and black also by egg diameter increase. The analysis showed that female crab fecundity has a strong correlation to the increase of carapace width, which means carapace width increase followed by egg’s amount increasing. During the study, it was found about 18% (981 crabs) the undersize crabs (<100 mm) and 24% (716 crabs) the berried female crabs, which means the Betahwalang fisherman hasn’t applied the rule yet.
Pengaruh Konsentrasi NaOH yang Berbeda Terhadaap Mutu Agar Rumput Laut Gracilaria verrucosa Kusuma, Wakhid Indra; Santosa, Gunawan Widi; Pramesti, Rini
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (185.176 KB) | DOI: 10.14710/jmr.v2i2.2473

Abstract

ponds in Indonesian. Agar from G. verrucosa is widely used in the food industry, one of which is used as a thickener or stabilizer of food. However, a good quality of agar with high durability needs developed. The purpose of this study with the addition of NaOH before extracted is to determine the effect of different concentrations of NaOH on the agar quality of seaweed G. verrucosa. This study was conducted from July 30 until August 16, 2012 in Plant Tissue Culture Laboratory, Faculty of Science and Mathematics - University of Diponegoro. Sampling was conducted on July 21, 2012. G. verrucosa was obtained from local ponds Tambak Harjo, Krapyak, District of West Semarang - Semarang. The method used was laboratory experimental methods with completely randomized design (CRD) to determine differences in the concentration of NaOH. The results showed that the effect of the concentration of NaOH affected the gel strength, sulphate content, ash content, moisture content, and yield on agar G. verrucosa (p Ë‚ 0,05). The higher the concentration of NaOH the higher gel strength, ash content, water content, and yield, but lowering sulphate levels. The best results obtained in the treatment with NaOH solution concentration of 6 %.
Analisis Perubahan Luasan Hutan Mangrove Di Kecamatan Brebes Dan Wanasari, Kabupaten Brebes Menggunakan Citra Satelit Landsat Tahun 2008, 2013 Dan 2018 Annisa, Amin Yunita Nur; Pribadi, Rudhi; Pratikto, Ibnu
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1281.318 KB) | DOI: 10.14710/jmr.v8i1.24323

Abstract

Mangrove merupakan ekosistem daerah peralihan yang memiliki beberapa fungsi diantaranya ekologis, fisik maupun ekonomi. Kerusakan mangrove sering terjadi di beberapa daerah sehingga kelestarian mangrove sangat perlu dijaga. Salah satu upaya untuk mengurangi kerusakan tersebut dengan kegiatan rehabilitasi. Kegiatan rehabilitasi ini bertujuan untuk memulihkan kondisi mangrove seperti keadaan semula. Keberhasilan dari kegiatan rehabilitasi ini dapat dipantau dengan sistem penginderaan jauh menggunakan citra Satelit Landsat. Penelitian ini dilakukan pada bulan Juni- Juli 2018. Metode penelitian ini menggunakan metode deskriptif bersifat eksploratif. Materi dalam penelitian ini adalah data citra satelit Landsat 5 untuk tahun 2008 dan Landsat 8 untuk tahun 2018. Berdasarkan hasil penelitian didapatkan nilai perubahan luasan hutan mangrove di Desa Kaliwlingi, Kecamatan Brebes dan Desa Sawojajar, Kecamatan Wanasari tahun 2008, 2013 dan 2018. Luas mangrove di Desa Kaliwlingi Kecamatan Brebes pada tahun 2008-2013 bertambah sebesar 101,25 ha yaitu 48,42 ha pada tahun 2008 dan 149,67 ha pada tahun 2013. Pada tahun 2013-2018 juga bertambah 184,23 ha yakni 333,9 ha pada tahun 2018. Pada Desa Sawojajar Kecamatan Wanasari, luas mangrove juga bertambah sebesar 0,09 ha yakni 24,39 ha pada tahun 2008 bertambah menjadi 24,48 ha pada tahun 2013. Tahun 2013-2018 juga bertambah sebesar 12,24 ha sehingga menjadi 36,72 ha di tahun 2018. Luas mangrove di Desa Kaliwlingi dan Sawojajar bertambah dalam kurun waktu sepuluh tahun.] Mangroves are transitional ecosystems that have several functions including ecological, physical and economic. Mangrove damage often occurs in several areas so that the preservation of mangroves is very important. One effort to reduce this damage is through rehabilitation activities. This rehabilitation activity aims to restore the condition of mangroves as they were before. The success of these rehabilitation activities can be monitored by remote sensing systems using Landsat Satellite imagery. This research was conducted in June-July 2018. This research method uses descriptive methods that are alternative. The material in this study is Landsat 5 satellite image data for 2008 and Landsat 8 for 2018. Based on the results of the study, the value of changes in a mangrove forests in Kaliwlingi Village, Brebes and Sawojajar Villages, Wanasari District in 2008, 2013 and 2018. The area of mangroves in Kaliwlingi Village, Brebes Subdistrict in 2008-2013 it increased by 101.25 ha, which was 48.42 ha in 2008 and 149.67 ha in 2013. In 2013-2018 it also increased by 184.23 ha, namely 333.9 ha in 2018. In Sawojajar Village, Wanasari Subdistrict, the area of mangroves also increased by 0.09 ha, which was 24.39 ha in 2008 which increased to 24.48 ha in 2013. 2013-2018 also increased by 12.24 ha to 36.72 ha in 2018. The area of mangrove in Kaliwlingi and Sawojajar villages has increased in ten years.
Struktur Komunitas Fitoplankton Di Ekosistem Padang Lamun Alami dan Buatan Di Perairan Teluk Awur Jepara Agus, ELza Lusia; Widianingsih, Widianingsih; Riniatsih, Ita
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (156 KB) | DOI: 10.14710/jmr.v2i4.3677

Abstract

Phytoplankton is an autotrophic microorganism lived on water as primer producer. Its existence is important for the other marine organisms. This research aims to now the abundance, diversity, uniformity, dominant and community similarity of phytoplankton area at natural and artificial seagrass bed ecosystem, Teluk Awur Jepara Waters. This research was carried aut every 2 weeks started from July 7th till September 2th 2012 at natural and artificial seagrass bed of Teluk Awur Jepara waters. Phytoplankton sample was collected from Teluk Awur Jepara seagrass bed whereas the method used is explorative with case study approach. Data was collected using sample survey method while location is determined by purposive method. The research found 3 classes of phytoplankton, consisted of 31 genera. Bacillariophyceae, Cyanophyceae and Dinophyceae. ). The most abundance of phytoplankton was found in the 4th sampling at station IV (195,17 cell/l) and the lowest abundance was found in 2nd sampling at station IV (63,49 cell/l). Diversity index ranged at 1,74 – 3,25 or medium category. Uniformity index ranged at 0,49 – 0,71 or medium category. Dominant index ranged at 0,07 – 0,51 or low category. Community similarity index ranged at 57,14 -100,00% or high category.
Potensi Ekstrak Kasar Teripang Holothuria atra, Jaeger, 1833 (Holothuroidea : Holothuriidae) Dari Pulau Panjang, Jepara Damanik, Sonny Rieldo; Yulianto, Bambang; Subagiyo, Subagiyo
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (509.232 KB) | DOI: 10.14710/jmr.v8i3.25272

Abstract

Aktivitas antibakteri yang terdapat dalam Holothuria atra dapat dimanfaatkan sebagai makanan fungsional yang dapat mengendalikan mikroflora dalam saluran pencernaan. Tujuan dari penelitian ini adalah untuk mengetahui potensi aktivitas antibakteri dari teripang H. atra terhadap bakteri B. cereus (gram positif) dan V. alginolyticus (gram negatif) sebagai foodborne pathogens. Sampel teripang H. atra diambil dari ekosistem lamun perairan Pulau Panjang dengan metode purposive sampling method untuk mengambil teripang berukuran panjang > 16 cm sebanyak 1 kg. Sampel H. atra dibersihkan lalu dipisahkan antara daging dan jeroannya, kemudian di maserasi menggunakan pelarut etil asetat dengan perbandingan 1:3 (w:v) selama 1x24 jam. Hasil maserasi diuapkan dengan rotary evaporator pada suhu 38o C. Ekstrak daging dan jeroan yang diperoleh adalah 669,8 mg dan 625,2 mg. Uji aktivitas antibakteri dilakukan dengan metode paper disk diameter 6 mm dengan konsentrasi 500 µg/disk, 1000 µg/disk, 2000 µg/disk, dan 4000 µg/disk. Aktivitas antibakteri yang diperoleh dari perbedaan konsentrasi yang diberikan berbeda secara nyata  dengan adanya peningkatan Activity Unit (AU) di setiap kenaikan konsentrasi. Aktivitas antibakteri terbesar yang diperoleh dari ekstrak daging H. atra pada konsentrasi 4000 µg/disk terhadap bakteri V. alginolyticus  (gram negatif) dan B. cereus (gram positif) masing-masing adalah 14214,08 mm2/ml dan 10508,62 mm2/ml. Aktivitas antibakteri terbesar yang diperoleh dari ekstrak jeroan H. atra pada konsentrasi  4000 µg/disk terhadap bakteri V. alginolyticus  (gram negatif) dan B. cereus (gram positif) masing-masing adalah 7858,72 mm2/ml dan 4919,68 mm2/ml. Berdasarkan penelitian ini, daging dan jeroan teripang H. atra keduanya memiliki aktivitas antibakteri terhadap bakteri B. cereus (gram positif) dan V. alginolyticus (gram negatif). The antibacterial activity contained in the bioactive compounds of sea cucumber Holothuria atra can be used as functional foods that can control microflora in the digestive tract. The purpose of this study was to determine the potential antibacterial activity of sea cucumber H. atra against B. cereus (gram positive) and V. alginolyticus (gram negative) as foodborne pathogens. The samples of H. atra in this study were taken from the seagass ecosystem of Panjang Island waters using the purposive sampling method so that the sea cucumbers taken were > 16 cm long. The obtained sea cucumber samples were cleaned and separated between the meat and the viscera, then macerated using ethyl acetate with a ration of 1:3 (w/v) for 24 hours. The solvent was evaporated using rotary evaporator at 38o C. The obtained meat and viscera extract of H. atra in this study were 669,8 mg and 625,2 mg. The antibacterial activity test was carried out using the diffusion method with a 6 mm paper disk (Kirby-Bauer Method), and the concentrations of each extract are 500 µg/disk, 1000 µg/disk, 2000 µg/disk, and 4000 µg/disk. The antibacterial activity of extracts from different concentrations were significantly different in line with the increasing results of activity unit (AU) at each increased concentration.  The largest activity unit was obtained from meat extract at a concentration of 4000 µg/disk. The antibacterial activity unit from meat extract against V. alginolyticus (gram-negative) and B. cereus (gram-positive) are 14214,08 mm2 / ml and 10508,62 mm2 / ml. The largest antibacterial activity unit of viscera extract against V. alginolyticus and B. cereus are 7858,72 mm2 / ml and 4919,68 mm2 / ml. Based on this study, meat and viscera extracts from H. atra both have antibacterial activity against B. cereus (gram-positive) and V. alginolyticus (gram-negative).
Distribusi dan Kelas Ukuran Panjang Kerang Darah (Anadara granosa) di Perairan Pesisir Kecamatan Genuk, Kota Semarang Prasojo, Setyo Adi; Irwani, Irwani; Suryono, Chrisna Adhi
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (397 KB) | DOI: 10.14710/jmr.v1i1.2001

Abstract

Anadara granosa are often called blood cockle because of a brownish red color of meat Anadara. This color is due to hemoglobin in the blood. This research was conducted in coastal waters district Genuk Semarang held in April to June 2009 using descriptive methods. The methods used to determination sampling location was purposive sampling methods. Samples were collected at intervals of once a month. The results that of distribution of A. granosa in Genuk District waters, Semarang. Found eight individuals in April, 30 individuals in May, and 1341 individuals in June. The highest abundance of A. granosa found at station I of 2314 ind / ha. Based on the classes of A. granosa in this area, the shells length variation have approximately uniform size but in this area more dominated by small and medium-sized A. granosa, whereas large shells were found relatively little, indicating that A. granosa in this area was undergoing to grow.