Pengaruh Tingkat Kerapatan dan Kedewasaan Hutan Mangrove dalam Memerangkap Sedimen di Muara Sungai Langsa Kota Langsa

In November 2021, a study on the effect of mangrove density and maturity level on sediment trapping in the Langsa River estuary, Langsa City, was conducted with the objective of determining the density, maturity, and rate of sediment deposition around the mangrove forest, as well as the relationship between mangrove density and maturity level and sediment deposition rate. Mangrove vegetation was collected using a 40 m line transect parallel to the river flow and a 10 x 10 m plot, while sediment samples were collected using a sediment trap. The study's findings indicated that mangrove density varied between 675.00 and 1541.67 ind/ha, that mangrove maturity was uneven, with trunk diameters ranging between 4.14 and 9.83 cm and basal areas ranging between 30.45 and 72.93 m2/ha. Meanwhile, sediment deposition rates ranged between 26.94 and 277.73 mg/cm2/day, with a strong correlation between density and maturity of mangrove vegetation (98% and 99%, respectively).   Penelitian terhadap pengaruh tingkat kerapatan dan kedewasaan hutan mangrove dalam memerangkap sedimen di muara Sungai Langsa Kota Langsa dilakukan pada bulan November 2021 dengan tujuan untuk mengetahui tingkat kerapatan, kedewasaan dan laju pengendapan sedimen di sekitar hutan mangrovenya serta untuk mengetahui keterkaitan antara tingkat kerapatan dan kedewasaan hutan mangrove terhadap laju pengendapan sedimennya. Vegetasi mangrove dikumpulkan dengan menarik transek garis sepanjang 40 m yang sejajar dengan aliran sungai dan dibuat plot berukuran 10 x 10 m, sedangkan sampel sedimennya diambil menggunakan sediment trap. Hasil penelitian memperlihatkan bahwa kerapatan mangrovenya berkisar antara 675.00 – 1541.67 ind/ha, kedewasaan mangrovenya tidak merata dengan diameter batangnya berkisar antara 4.14 – 9.83 cm dan basal areanya berkisar antara 30.45 – 72.93 m2/ha. Sementara untuk laju pengendapan sedimennya berkisar antara 26.94 – 277.73 mg/cm2/hari, dimana keterkaitan antara kerapatan dan kedewasaan vegetasi mangrovenya memiliki hubungan yang kuat (masing-masing 98% dan 99%)

Lobster (Panulirus spp) catch in simeulue waters, aceh province: composition and results

Aceh Province's main export is lobster. This commodity commands a high economic price in Simeulue Regency, which boasts exceptional commodities in the fisheries industry, particularly lobster. The purpose of this study is to describe the composition of the catch and the productivity of the catch of six different varieties of lobster in the Simeulue water. The research methods employed include field surveys to collect data directly from fishermen. The study was carried out in Simeulue waters in numerous areas in 2023, including Busung, Kampung Air, Teupah Selatan, and Alafan. The types of samples taken were six species consisting of Panulirus homarus, P. longipes, P. penicillatus, P. versicolor, P. ornatus and P. polyphagus. The research results showed that the catch comprised lobster species such as Panulirus homarus, P. longipes, P. penicillatus, P. versicolor, P. ornatus, and P. polyphagus. The catch composition was dominated by Panulirus penicillatus (44%) and P. versicolor (23%). The length and weight growth of the six varieties of lobster is allometric, which is vital for sustainable fisheries management. The research findings also show oscillations in the supply of Simeulue lobster shipments, with peak delivery in 2022 (246,157 ind) and a fall in 2023 (57,654 ind). It is critical to underline the need for sustainable management in maintaining a balance between usage and conservation of fishing resources

Inovasi desain keramba untuk budidaya tiram dalam meningkatkan ekonomi masyarakat pesisir di Gampong Cot Seurani, Kabupaten Aceh Utara (Innovation of cage design for oyster cultivation on improving the economy of coastal communities in Cot Seurani Village, Aceh Utara District)

Cot Seurani Village is one of the coastal villages in Muara Batu District, North Aceh Regency which has fisheries and marine potential that can be used as oyster cultivation land. The people in Cot Seurani Village predominantly work as fishermen, the potential of existing oysters has not been utilized optimally, they still collect them directly from nature, such as on rocks at TPI and its surroundings. The aim of this service activity is to introduce, socialize and directly practice the innovation of oyster cages which can be used as oyster cultivation business land in Cot Seurani Village, North Aceh in order to encourage oyster farmers to open oyster cultivation businesses independently and in a measurable manner using economical materials. The stages of this activity include program planning, preparation, socialization on making oyster cages, lowering oyster cages into the sea and monitoring and evaluating to publishing the results of the service in print media and scientific journals, as well as making reports on the results of the service. The final result, in the form of samples of oyster cage products that have been lowered into the sea, can be used by oyster farmers as an environmentally friendly oyster cultivation area to facilitate the production process and improve the welfare of oyster farmers in Cot Seurani Village

VARIABILITAS KONSENTRASI KLOROFIL-a DI BAGIAN BARAT PERAIRAN ACEH, INDONESIA BERDASARKAN PERGERAKAN ANGIN MONSUN

The waters of the western part of Aceh are located in the eastern part of the Indonesian Ocean. This area is a dynamic waters because it is part of Indonesian waters which is located between two continents and two oceans. The concentration of chlorophyll-a varies monthly basis in these waters. This study observed variability of chlorophyll-a concentration based on monsoon circulation. Analysis of chlorophyll-a concentration can be used to estimate the productivity of a waters. We found that the concentration of chlorophyll-a in the West Monsoon was higher than in the East Monsoon. In contrast, the concentration of chlorophyll-a in the East Monsoon was lower than in the West Monsoon.Perairan Aceh bagian Barat terletak di bagian Timur Samudera Indonesia. Kawasan ini merupakan perairan yang dinamis karena merupakan bagian dari perairan Indonesia yang terletak di antara dua benua dan dua samudera. Konsentrasi klorofil-a bervariasi secara bulanan di perairan ini. Penelitian ini mengamati variasi konsentrasi klorofil-a berdasarkan sirkulasi angin muson. Analisis konsentrasi klorofil-a dapat digunakan untuk membantu perkiraan produktivitas sebuah perairan. Kami menemukan bahwa konsentrasi klorofil-a di Monsun Barat lebih tinggi daripada di Monsun Timur. Sebaliknya, konsentrasi klorofil-a di Monsun Timur lebih rendah dibandingkan di Monsun Barat

PELATIHAN PENGGUNAAN TEKNOLOGI GLOBAL POSITIONING SYSTEM (GPS) SEBAGAI ALAT BANTU OPERASI PENANGKAPAN IKAN BAGI GENERASI MILLENNIAL ACEH

Training on the use of GPS technology as a fishing operation tool for Aceh's millennial generation was carried out on June 21 – 27, 2021 at the Unimal Campus Reuleut, North Aceh Regency and the Indian Ocean. This training aims to educate and improve the skills of the millennial generation of Aceh Province to take advantage of the use of GPS to help detecting the presence of fish in the ocean. The training was delivered using a community development approach that included lectures and focus group discussions (FGD), as well as theory and field practice. The training was well-structured, smooth, and successful, involving the Acehnese millennial generation aged 20-25 years, with the training divided into four stages planning, preparation, implementation, and monitoring and evaluation. The material provided in the theory class includes knowledge and developments in the use of GPS globally, whereas the practical class involves the operation of GPS directly on the ship. The monitoring and evaluation results revealed that participants benefited greatly from using GPS catching tools in detecting the presence of fish, allowing them to increase catches and easily locate fishing grounds

IDENTIFIKASI MIKROALGA LAUT POTENSIAL SEBAGAI BAHAN BAKU BIODIESEL DI KECAMATAN BANDA SAKTI KOTA LHOKSEUMAWE

Banyak penelitian yang telah dilakukan untuk menemukan potensi sumber energi alternatif dari bahan-bahan yang dapat diperbarui dan ramah lingkungan akibat dari menipisnya sumber energi fosil. Salah satu upaya dalam meningkatkan kemandirian energi adalah dengan menyiapkan bahan bakar alternatif potensial yang berasal dari mikroalga. Kecamatan Banda Sakti memiliki potensi sumberdaya pesisir dan lautan yang belum banyak dikaji, salah satunya adalah mikroalga. Tujuan penelitian ini untuk mengetahui jenis mikroalga yang berpotensi sebagai bahan baku biodiesel di Kecamatan Banda Sakti Kota Lhokseumawe. Penelitian dilaksanakan pada bulan Oktober – November 2021 di Perairan Laut Kecamatan Banda Sakti, Kota Lhokseumawe dengan menggunakan metode purposive sampling. Ditemukan sebanyak 143 jenis mikroalga dan ditemukan 4 jenis mikroalga yang telah dikembangkan sebagai bahan biodiesel yaitu Cholera sp., Spirulina sp., Nitzschia sp., dan Chaetoceros sp. Jenis mikroalga yang paling melimpah yaitu Raphidonema sp., jenis ini perlu diteliti lebih lanjut untuk melihat potensi sebagai bahan baku biodiesel. Kelimpahan total mikroalga berkisar antara 350,00–561,11 ind/L. Nilai parameter kualitas perairan masih dalam kondisi baik untuk kehidupan mikroalga. Perairan laut Kecamatan Banda Sakti, Kota Lhokseumawe memiliki potensi mikroalga untuk dikembangkan sebagai bahan baku biodiesel.Many studies have been carried out to find potential alternative energy sources from renewable and environmentally friendly materials due to the depletion of fossil energy sources. One of the efforts to increase energy independence is to prepare potential alternative fuels derived from microalgae. Banda Sakti District has the potential of coastal and marine resources that have not been studied much, one of which is microalgae. The purpose of this study was to determine the type of microlaga that has the potential as raw material for biodiesel in Banda Sakti District, Lhokseumawe City. The research was carried out in October – November 2021 in the Sea Waters of Banda Sakti District, Lhokseumawe City using purposive sampling method. Found as many as 143 types of microalgae and found 4 types of microalgae that have been developed as biodiesel material, namely Cholera sp., Spirulina sp., Nitzschia sp., and Chaetoceros sp.. The most abundant type of microalgae is Raphidonema sp., this species needs to be investigated further to see its potential as a biodiesel feedstock. The total abundance of microalgae ranged from 350.00–561.11 ind/L. The water quality parameter values ​​are still in good condition for microalgae life. The marine waters of Banda Sakti District, Lhokseumawe City have the potential for microalgae to be developed as biodiesel feedstock

THE EFFECT OF DIFFERENCES pH OF WATERS ON THE GROWTH RATE OF SEAGRASS OF Cymodocea rotundata

Penggunaan bahan bakar fosil yang terus berlangsung akan meningkatkan konsentrasi karbondioksida (CO2) di atmosfer. Asidifikasi laut terjadi akibat CO2 yang berada di atmosfer berdifusi ke lautan. Lautan mampu menyerap CO2 di atmosfer sebanyak 35 % lebih yang menyebabkan terjadinya penurunan pH laut. Lamun Cymodocea rotundata merupakan salah satu jenis lamun yang banyak ditemukan tumbuh di perairan tropis. Keadaan ini menimbulkan kekhawatiran tentang kemungkinan terjadinya dampak pada pertumbuhan lamun C. rotundata. Penelitian ini bertujuan untuk menganalisis kandungan nitrat, fosfat dan kalium dan pertumbuhan lamun C. rotundata yang meliputi pertumbuhan daun, rhizoma, dan akar C. rotundata terhadap perbedaan pH. Penelitian menggunakan metode eksperimen dengan rancangan acak lengkap menggunakan tabel acak. Sebanycak 15 toples dengan ukuran diameter 20 cm dan tinggi 25 cm digunakan dengan 3 perlakuan, masing-masing perlakuan 5 kali pengulangan. Hasil uji regresi linier menunjukkan pH berpengaruh terhadap konsentrasi nitrat, dan berpengaruh kuat terhadap konsentrasi fosfat dan kalium. Laju pertumbuhan daun lamun C. rotundata tertinggi pada kontrol berkisar antara 0,50–1,29 mm/hari sedangkan yang terendah pada pH rendah berikisar 0,07–0,73 mm/hari. Laju pertumbuhan rizhoma lamun secara horizontal dan vertikal tertinggi pada pH rendah sedangkan yang terendah pada pH kontrol. Laju pertumbuhan akar lamun tertinggi pada pH rendah berkisar antara 0,20–0,90 mm/hari. sedangkan yang terendah pada kontrol berkisar antara 0,13–0,43 mm/hari. pH juga memengaruhi laju pertumbuhan daun, rhizoma dan akar lamun C. rotundata. Semakin rendah pH maka laju pertumbuhan daun juga semakin rendah, berbeda dengan rhizoma dan akar semakin rendah pH maka semakin tinggi laju pertumbuhan.The continued use of fossil fuels will increase the concentration of carbon dioxide (CO2) in the atmosphere. Ocean acidification occurs due to CO2 in the atmosphere diffusing into the oceans. The oceans are able to absorb CO2 in the atmosphere as much as 35 % more which causes a decrease in ocean pH. Seagrass Cymodocea rotundata is a type of seagrass that can be found growing in tropical waters. This situation raises concerns about the possible impact on the growth of seagrass C. rotundata. This study aims to analyze the content of nitrate, phosphate and potassium and the growth of seagrass C. rotundata which includes the growth of leaves, rhizomes and roots of C. rotundata against differences in pH. The study used an experimental method with a completely randomized design using a random table. A total of 15 jars with a diameter of 20 cm and a height of 25 cm were used with 3 treatments, each treatment was repeated 5 times. The results of the linear regression test showed that pH had an effect on nitrate concentrations, and had a strong effect on phosphate and potassium concentrations. The highest growth rate of C. rotundata seagrass leaves in the control ranged from 0.50–1.29 mm/day while the lowest at low pH ranged from 0.07–0.73 mm/day. The growth rate of seagrass rhizomes horizontally and vertically was highest at low pH while the lowest was at control pH. The highest growth rate of seagrass roots at low pH ranged from 0.20–0.90 mm/day. while the lowest was in the control ranged from 0.13–0.43 mm/day. pH also affects the growth rate of leaves, rhizomes and seagrass roots of C. rotundata. The lower the pH, the lower the leaf growth rate, in contrast to rhizomes and roots, the lower the pH, the higher the growth rate