Coral reef ecosystem is considered as a very complex ecosystem and a habitat for marine biota, included reef fish community. The purpose of this study is to obtain the value of diversity, evenness and dominance index of reef fish in Krueng Raya Waters (KRW). This research was conducted annually during 2014, 2015, 2016 using the UVS (underwater Visual Census) method. The diversity index of reef l fish in the KRW is categorized as stable (1 <H '<3), yet it was decreased from 2.6 in 2014 to 2.1 in 2016. the value of uniformity index is ranged 0.8 to 0.62 (2014 to 2016) as it categorized as low. Furthermore, the dominance index is also indicated in the low category.
Groupers are of considerable economic value in southeast Asia. Cage culture is considered as the proper technology to maximize the sustainable biomass production in a unit area. This research assesses a site selection approach for net-cage grouper mariculture in the eastern coastal area of Simeulue Island, namely Sambai, Kuta Batu and Pulau Bengkalak. Data collection focused on 7 biophysical site capability parameters i.e.: current flow, temperature, water clarity, bottom depth, pH, salinity, dissolved oxygen. Suitability analysis identified all stations was categorized as a very appropriate and appropriate conditions for the fish cage location.Abstrak. Kerapu merupakan komoditas unggulan dan memiliki permintaan pasar yang tinggi di daerah Asia Tenggara. Keramba jaring apung (KJA) dianggap sebagai teknologi yang tepat untuk meningkatkan biomassa budidaya di suatu wilayah. Penelitian ini bertujuan untuk mengkaji kesesuaian lokasi penempatan KJA di wilayah pesisir timur Pulau Simeulue yaitu Sambai, Kuta Batu dan Pulau Bengkalak. Kajian data difokuskan pada tujuh parameter biofisik yaitu arus, suhu, kecerahan, kedalaman perairan, pH, salinitas, dan oksigen terlarut. Analisis kelayakan menunjukkan seluruh stasiun dikategorikan sebagai layak dan sangat layak untuk lokasi budidaya KJA.
The aim of this study was to determine hard coral cover at the time before (2015), during (2016) and after coral bleaching (2017) in Krueng Raya, Aceh besar. This study was conducted on April 2017 in Krueng Raya, Aceh Besar. Data collection was carried out at 3 observation stations using the PIT (Point Intercept Transect) method which included : Fort Inong Balee, Ahmad Rhang Manyang, and Lhok Mee. The results showed that the average percentage of hard coral cover in 2017 was 22.90% (bad category), it was lower than in 2016 32.43% (medium category) and in 2015 was 52.83% (good category). There were found 16 genera of coral (2015), 18 genera of coral (2016), and 8 genera of coral (2017). Mortality Index (MI) in 2015 ranged between 0.02-0.20 (low coral mortality rate), in 2016 ranged between 0.13-0.49 (low coral mortality rate), in 2017 ranged between 0.63-0.79 (high coral mortality rate). The results of this study indicate that the percentage of hard coral cover has decreased to reach 50% due to coral bleaching in the waters of Krueng Raya Aceh Besar. ABSTRAKPenelitian ini bertujuan untuk mengetahui tutupan karang keras pada waktu sebelum (tahun 2015) saat (2016) dan sesudah pemutihan karang (2017) di Krueng Raya, Aceh Besar. Penelitian ini dilakukan pada bulan April 2017 di Krueng Raya, Aceh Besar. Pengambilan data dilakukan di 3 stasiun pengamatan menggunakan metode PIT (Point Intercept Transect) yang meliputi: Benteng Inong Balee, Ahmad Rhang Manyang, dan Lhok Mee. Hasil penelitian menunjukkan persentase rata -rata tutupan karang keras tahun 2015 sebesar 52,83% berkategori baik, tahun 2016 sebesar 32,43% berkategori sedang dan tahun pada tahun 2017 persentase tutupan karang keras menjadi 22,90% dan masuk ke dalam kategori rusak. Terdapat sebanyak 16 genus karang (2015), 18 genus karang (2016) dan 8 genus karang 8 (2017). Indeks Mortalitas (IM) tahun 2015 berkisar antara 0,02-0,20 (tingkat kematian karang yang rendah), tahun 2016 berkisar antara 0,13-0,49 (kematian karang rendah), tahun 2017 berkisar antara 0,63-0,79 (tingkat kematian karang tinggi). Hasil penelitian ini menunjukkan bahwa persentase tutupan karang keras mengalami penurunan hingga mencapai ±50% yang diakibatkan oleh pemutihan karang pada Perairan Krueng Raya Aceh Besar.Kata kunci : indeks mortalitas, pemutihan karang, tutupan karang keras
<p><strong><em>Abstract</em></strong><strong><em>.</em></strong><em> </em><em>Granulometric study is considered as a tool to predict sediment formation process in an aquatic environment. This paper discusses brief assessment of granulometri studies on seagrass and coral reef areas in Indonesia by </em><em>collecting</em><em> samples at Pari Island waters. Sediment samples were taken in May 2008 near the coral reefs and seagrass area in the cluster of Pari Island waters, Seribu Islands, Jakarta. The wet sieving method was done to separate the sediment samples based on grain size. </em><em>S</em><em>tatistical analysis </em><em>i.e., </em><em>mean, sorting, skewness, and kurtosis at both locations showed </em><em>a </em><em>considerably complex energy works on the sediment distribution in these locations.</em></p><p><strong><em>Keywords</em></strong><em>: granulometry; sediment; coral reef; seagrass</em></p><p> </p><p><strong>Abstrak</strong><strong>. </strong>Studi granulometri dapat menjadi alat penduga proses terbentuknya sedimen di suatu lingkungan perairan. Tulisan ini membahas kajian ringkas studi granulometri pada kawasan lamun dan terumbu karang di Indonesia dengan mengambil contoh di perairan Pulau Pari. Sampel sedimen diambil pada Mei 2008 di kawasan terumbu karang dan lamun pada perairan gugusan Pulau Pari, Kepulauan Seribu, Jakarta. Metode ayak basah dilakukan untuk memisahkan sampel sedimen berdasarkan ukuran butir. Hasil analisis statistik ukuran butiran berupa <em>mean</em>, <em>sorting</em>, <em>skewness</em>, dan <em>kurtosis</em> pada kedua lokasi mengindikasikan fungsi energi yang cukup kompleks bekerja terhadap sebaran sedimen di lokasi tersebut.</p><p><strong>Kata kunci</strong>: granulometri; sedimen; terumbu karang; padang lamun</p>
Muchlisin ZA, Zulkarnaini B, Purnawan S, Muhadjier A, Fadli N, Cheng SH. 2014. Morphometric variations of three species of harvested cephalopods found in northern sea of Aceh Province,. The purpose of the present study was to evaluate the morphometrics of three harvested cephalopods, Sepioteuthis lessoniana, Sepia officinalis and Uroteuthis sp. found in northern sea of Aceh Province, Indonesia. Sampling was conducted for six months from July to December 2012 in one week interval. A total of 318 cephalopods; 139 Sepioteuthis lessoniana, 139 Uroteuthis sp. and 40 Sepia officinalis were analyzed for morphometric study and 13 anatomical characters were measured to the nearest 0.01 mm using a digital caliper. Morphometric measurements were significantly different between the different species of cephalopods (ANOVA, p<0.05). S. officinalis differed in six morphological characters (head length, head width, tentacles length, gladius width, rancis width and length) from the squid species. Fin width and length were significantly greater in S. lessoniana than in S. officinalis and Uroteuthis sp. On the other hand, Uroteuthis sp. had significantly greater mantle lengths, standard lengths and gladius lengths than the other two cephalopod species (Duncan Test, p<0.05). However, fin width was similar between S. lessoniana and Uroteuthis sp., while eye diameter was similar between S. officinalis and Uroteuthis sp. A Discriminant Function Analysis scatter plot successfully discriminated the three species indicating significant differences in morphological variation. This analysis also indicates that morphometrically, S. lessoniana and S. officinalis are more similar to each other despite being in different orders.
The objective of the present study was to study the diversity of marine macroinvertebrates in coral reef area in Aceh Besar waters. This research was conducted in September 2012 until February 2013in nine locations in the waters of Aceh Besar district, namely: AmatRamanyang, Lampuuk, PulauDituan, LhokKetapang, LhokSeudu 1, LhokSeudu 2, Deudap 1, Deudap 2, and Lamteung. The macroinvertebrates were recorded using three repeated 20 m belt transect in two different depths (2-4 m and 4-8 m) in each site. The result showed 46 species of macroinvertebratesbelonging toseven phyla were recorded. The diversity index in research station ranged between 0.88 - 2.26 (low to medium category).
Kandungan mineral besi pada alam menjadi topik yang menarik untuk dikaji terkait peran pentingnya secara ekonomi. Keberadaan magnetite pada sedimen di suatu wilayah perairan dapat juga digunakan sebagai fingerprint dari proses transport sedimen. Penelitian ini ditujukan untuk mengamati sejumlah parameter butiran sedimen untuk mendapatkan gambaran pola distribusi sedimen yang terjadi pada daerah Labuhan Haji Timur, Aceh Selatan. Pengambilan sampel sedimen dilangsungkan pada November 2015 menggunakan metode coring. Sebanyak empat stasiun dipilih untuk mewakili kawasan perairan Labuhan Haji timur, yang terdiri dari daerah aliran sungai, muara, dan pantai. Sejumlah analisis yang dilakukan adalah ukuran butiran rata-rata, bentuk partikel, dan kandungan kimia penyusun sedimen. Analisis kandungan kimia dari sampel sedimen dilakukan pada Laboratorium Sentral Mineral dan Material Maju, FMIPA Universitas Malang menggunakan X-Ray Fluorescence (XRF), dimana sebelumnya sampel dari setiap stasiun dipilah berdasarkan ukuran halus (<0,5 mm) dan kasar (>0,5 mm). sampel sedimen yang berasal dari pantai dan muara memiliki modus distribusi ukuran sedimen pada fraksi pasir sangat halus, sedangkan modus pada daerah aliran sungai berada pada fraksi pasir sangat kasar. Magnetite ditemukan pada setiap lokasi sampling, persentase tertinggi berada pada kawasan muara. Analisis bentuk butiran magnetite menunjukkan bentuk yang lebih angular pada daeah aliran sungai dan menjadi lebih rounded pada kawasan pantai. Disimpulkan bahwa kandungan magnetite yang terdapat pada kawasan pantai di Labuhan haji Timur ditransportasikan melalui aliran Sungai Peulumat.
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