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Peramalan Curah Hujan Terhadap Produktivitas Garam Di Gersik Putih Sumenep Tifani Noviasari; Nike Ika Nuzula; Makhfud Efendy; Angga Arifta Febrianto; Ahmad Darmadi
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.16139

Salt production in Madura Island is running by evaporation method (solar evaporator). Thus, the process of salt production is highly dependent on weather factors. Weather conditions is one of the determinants of the success of salt production targets. In this study aims to determine the forecasting process of rainfall in support of salt production process at PT Garam Gersik Putih Sumenep. The method used to analyze rainfall data on PT Garam Gersik Putih in 2022 is the box-Jenkins Autoregressive Integrated Moving Average (ARIMA) model. Box-Jenkins Autoregressive Integrated Moving Average (ARIMA) is one of the time series forecasting methods using values in the past as dependent variables and independent variables. From the forecast results, it is known that Gersik Putih Pheasant has 9 dry dasarian with an estimated production of 27,360 tons. Saltworks Gersik Putih has 456 plots of crystallization land with a total land area of 126.36 Ha. The results of weather forecasting analysis can determine the time of pre-production , salt production and post-production of salt. Pre-production of salt is an activity of preparation and maintenance of infrastructure to maximize the upcoming dry season. Pre-production of salt is carried out from January to May. Salt production activities are processing sea water into salt crystals that take place from June to early november. At the peak of drought in 1 plot of land crystallization can produce 3-6 tons in one harvest. Post salt production is the activity of transporting salt from pheasant land to olo warehouse which is carried out from November to December due to the increase in rainfall intensity. The box-Jenkins integrated Moving Average (ARIMA) Autoregressive Model applied has a pearson coefficient correlation level of 0,94%. The correlation value of the pearson coefficient shows that forecasting is very good, adequate and feasible to use. Produksi garam di Pulau Madura dilakukan dengan menggunakan metode penguapan (solar evaporator). Proses produksi garam bergantung pada curah hujan. Curah hujan menjadi penentu keberhasilan produksi garam. Pada penelitian ini bertujuan untuk mengetahui proses peramalan curah hujan dalam mendukung proses produksi garam pada PT Garam Gersik Putih Sumenep. Metode peramalan data curah hujan pada PT Garam Gersik Putih tahun 2022 adalah model Autoregressive Integrated Moving Average (ARIMA) Boox-Jenkins. ARIMA Boox-Jenkins adalah salah satu metode peramalan menggunakan nilai variabel independen dan variabel dependen. Dari hasil prakiraan diketahui bahwa pegaraman Gersik Putih memiliki ±9 dasarian kering dengan estimasi hasil produksi sebesar 27.360 ton. Pegaraman Gersik Putih memiliki 456 petak lahan kristalisasi dengan jumlah luas lahan 126,36 Ha. Hasil analisis peramalan cuaca juga dapat menentukan kapan berlangsungnya pra produksi garam, produksi garam serta pasca produksi garam. Pra produksi garam merupakan kegiatan persiapan dan pemeliharaan sarana prasarana untuk memaksimalkan musim kemarau mendatang. Pra produksi garam dilaksanakan pada bulan januari hingga mei. Kegiatan produksi garam yaitu mengolah air laut hingga menjadi kristal garam yang berlangsung bulan juni hingga november awal. Pada puncak kemarau dalam 1 petak lahan kristalisasi dapat menghasilkan 3 – 6 ton dalam sekali panen. Pasca produksi garam adalah kegiatan pengangkutan garam dari lahan pegaraman menuju gudang olo yang dilaksanakan bulan november hingga desember karena kenaikan intensitas curah hujan. Model Autoregressive Integrated Moving Average (ARIMA) Boox-Jenkins yang diterapkan memiliki tingkat korelasi koefisien pearson sebesar 0,94%. Nilai korelasi koefisien pearson tersebut layak untuk digunakan untuk metode peramalan.

Prevalensi Cacing Endoparasit Ikan Tongkol Lisong di Pasar Induk Pulau Bangka Junita Junita; Budi Afriyansyah; Hasbullah Iwansyah Hakim
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.15380

The Bullet Tuna (Auxis rochei) is a low-cost fish popular among Bangka residents. Bullet Tuna has components that are good for the human body, such as protein, carbs, and minerals. However, because Bullet Tuna is classed as a carnivorous fish with the ability to contain endoparasites, it must be ensured that it is safe and healthy for consumers. The goal of this study was to determine the prevalence, intensity, and relationship between fish class length and the presence of endparasites infecting tuna in Bangka Island’s primary market. This research was conducted in March 2021 - July 2022. Pangkalpinang, Sungailiat, Koba, Toboali, and Muntok Main Markets on Bangka Island were all used to collect samples. The Parasite Testing Laboratory (LP-683-IDN) of the Fish Quarantine Station for Quality Control and Safety of Fishery Products (SKIPM) Pangkalpinang tested the samples. Anisakis sp., Didymozoid sp., Lecithochirium sp., and Rhadinorhyncus sp. are four types of endoparasites found in Bullet Tuna (Auxis rochei) samples, according to the findings. With a prevalence rate of 45.67 percent, the number of infected samples from the total number of samples examined fell into the category of Very Frequent infection. In the moderate infection category, Rhadinorhyncus sp. Had the highest intensity. The fish with the highest endoparasites, 986 parasites, were in the class range with a size 21,46-23,03 cm.The presence of Bulet tuna infected with endoparasitic worms in this Main Market must be reported so that the public can be more vigilant in managing fish in a good and correct way. Ikan Tongkol Lisong (Auxis rochei) termasuk ikan dengan harga yang ekonomis di kalangan masyarakat Bangka. Kandungan protein, karbohidrat dan mineral pada Ikan Tongkol Lisong merupakan nutrisi yang bermanfaat bagi tubuh manusia. Ikan Tongkol Lisong yang memiliki nilai gizi tinggi harus dipastikan aman dan sehat bagi konsumen, karena Ikan ini tergolong ikan karnivora yang berpotensi sebagai inang endoparasit. Penelitian ini bertujuan untuk menganalisis tingkat prevalensi, intensitas dan korelasi panjang kelas ikan terhadap keberadaan endoparasit yang menginfeksi Ikan Tongkol di Pasar Induk Pulau Bangka. Penelitian ini dilaksanakan pada bulan Maret 2021 - Juli 2022. Sampel diperoleh dari 5 Pasar Induk Pulau Bangka meliputi Pasar Induk Pangkalpinang, Sungailiat, Koba, Toboali dan Muntok. Pengujian sampel dilakukan di Laboratorium Penguji Parasit (LP-683-IDN) Stasiun Karantina Ikan Pengendalian Mutu dan Keamanan Hasil Perikanan (SKIPM) Pangkalpinang. Hasil identifikasi didapatkan 4 jenis endoparasit yang menginfeksi sampel Ikan Tongkol Lisong (Auxis rochei) yaitu Anisakis sp., Didymozoid sp., Lecithochirium sp. dan Rhadinorhyncus sp. Jumlah sampel yang terinfeksi dari seluruh jumlah sampel diuji diperoleh nilai tingkat prevalensi sebesar 45,67% dengan kategori infeksi Sangat Sering. Intensitas tertinggi ditemukan pada infeksi endoparasit Rhadinorhyncus sp. yang masuk dalam kategori Infeksi Sedang. Rentang kelas dengan ukuran antara 21,46 cm hingga 23,03 cm menjadi ukuran ikan yang paling banyak diinfeksi oleh endoparasit yaitu sebanyak 986 parasit. Keberadaan Ikan Tongkol Lisong yang terinfeksi cacing endoparasit di Pasar Induk ini harus dilaporkan sehingga masyarakat dapat lebih waspada dalam mengelola ikan dengan cara yang baik dan benar.

Kandungan Total Fenolik dan Nilai Sun Protection Factor Ekstrak Sargassum sp. Dimas Dharmawan; Norisca Aliza Putriana; Santi R. Anggraeni
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.15934

Seaweed or macroalgae is one of the natural products with biological activities such as antioxidant, antibacterial, and immunostimulant. One of them is the brown alga Sargassum sp. This brown alga produces secondary metabolites such as flavonoids and their derivatives as well as polyphenols. These compounds have many roles in counteracting ultraviolet radiation and have the potential to be developed as active ingredients of sunscreen. This study aimed to determine the total phenolic content and the Sun Protection Factor (SPF) value of Sargassum sp. originating from Pameungpeuk beach, Garut Regency. The SPF value is used to categorize how efficiently a material prevents exposure to ultraviolet radiation. Total phenolic content was measured using Follin Ciocalteu reagent with gallic acid standard. The Sargassum sp extract sample contained total phenolic of 149,04±5,14 mg GAE/g. The SPF value of Sargassum sp extract was calculated using the Mansur equation at a wavelength of 290-320 nm. The obtained SPF value of extract was 33,2±3,11 which equals to oxybenzone. The value indicated an ultra-protection capability and the potency of extract for further development as UV filter. Rumput laut atau makroalga merupakan salah satu bahan alam dengan aktivitas biologis seperti antioksidan, aktivitas antibakteri dan imunostimulan. Salah satunya adalah alga cokelat jenis Sargassum sp. Alga cokelat ini menghasilkan metabolit sekunder seperti flavanoid dan turunannya serta polifenol dan turunannya. Senyawa-senyawa tersebut banyak berperan dalam menangkal radiasi ultraviolet dan berpotensi dikembangkan sebagai bahan aktif tabir surya. Penelitian ini bertujuan untuk mengetahui kandungan total fenolik dan nilai Sun Protection Factor (SPF) dari Sargassum sp yang berasal dari pantai Pameungpeuk, Kabupaten Garut. Kandungan total fenolik diukur dengan menggunakan reagen Follin Ciocalteu dan menggunakan standar baku asam galat. Sampel ekstrak Sargassum sp mengandung total fenolik sebesar 149,04±5,14 mg GAE/g. Nilai SPF digunakan untuk mengkategorikan seberapa efisien sebuah bahan dalam menangkal paparan radiasi sinar ultraviolet. Nilai SPF ekstrak Sargassum sp dihitung menggunakan menggunakan persamaan Mansur pada panjang gelombang 290-320 nm. Nilai SPF yang didapatkan yaitu 33,2±3,11 yang tergolong ke dalam kategori ultra.

Composition, Distribution, and Fisheries Biology of Penaeid Shrimp from the Strong Wavy Waters of Southern Java, Indonesia Rianti Pratiwi; Wanwan Kurniawan; Ayuningtyas Indrawati; Putri Sapira Ibrahim; Muhammad Hafizt
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.15758

Penaeidae is a family of shrimp that has a high economic value, leading to intensive exploitation in many areas. This research was conducted to ascertain the composition, distribution, and fisheries biology of Penaeid shrimps in the strong wavy water of southern Java Island, Indonesia. The research locations were the water of Eastern, Central, and Western Java. Shrimp samples were obtained using various ways. The carapace length (CL) of the shrimps were measured using plastic callipers and recorded to the nearest 1 mm. The results showed that eight species of shrimps were caught in the water of southern Java, with Penaeus merguiensis, P. semisulcatus, and P. monodon being the most common. The species P. merguiensis was found in each sampling location, while P. latisulcatus and Metapenaeus palmensis were only present at Drini Beach (Central Java). The results also showed that P. japonicus and M. lysianassa were only found at Ranca Buaya Beach (West Java). The species P. merguiensis and P. monodon were the two most commercially important species. The distributions of the shrimps were related to the water physical characteristics associated with the shrimp habitat namely SST, bathymetry, and tides. Fishery biology analysis found that the length at first impregnation of P. merguiensis at Damas and Sidem Water (East Java) was 25.9 cm CL. Furthermore, the LBSPR analyses revealed that the spawning capacity of P. merguiensis and M. ensis in the same waters were still very high under the current level of exploitation. Therefore, the magnitude of fishing has not endangered the sustainability of the two shrimps.

Pengetahuan Masyarakat Lokal Terkait Keberadaan Kepiting Tapal Kuda dan Distribusinya di Sepanjang Pesisir Pulau Bintan Rika Anggraini; Ita Karlina
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.15693

There are many reports of a decline in the population of horseshoe crabs in Asia, but knowledge about the distribution of horseshoe crabs on the coast of Bintan Island is still limited. We conducted interviews in 15 locations on the coast of Bintan Island. The information we collect is about the distribution of potential spawning areas and the utilization of horseshoe crabs in each area. Respondents were randomly selected as the surveyor walked through each study site. Verification of the distribution and breeding grounds of horseshoe crabs by respondents was done by asking respondents to indicate the location where they had seen pairs of horseshoe crabs mating, juveniles, and horseshoe crab eggs met; we also validated with direct observations made in the field. Respondents reported that in 15 locations, they had seen juveniles and horseshoe crabs in pairs. One respondent directly observed horseshoe crab eggs on the beach, and only a few found horseshoe crabs laying eggs. Respondents who saw paired horseshoe crabs generally worked as fishermen. We found three juvenile locations for horseshoe crabs, namely at Tembeling, Pengujan and Pengudang locations. At three locations Tachypleus gigas and Carcinoscorpius rotundicauda were found. Horseshoe crabs on Bintan Island are used as fertilizer, medicine and wall decoration. In this study, local wisdom provides essential information regarding the potential distribution of spawning grounds and the utilization of horseshoe crabs on the coast of Bintan Island Banyaknya laporan mengenai penurunan populasi kepiting tapal kuda di Asia, tetapi pengetahuan tentang distribusi kepiting tapal kuda di Pesisir Pulau Bintan terbatas. kami melakukan wawancara di 15 lokasi di pesisir Pulau Bintan. Informasi yang kami kumpulkan tentang distribusi potensi daerah pemijahan, dan pemanfaatan kepiting tapal kuda pada masing-masing daerah. Responden dipilih secara acak pada saat pihak survei berjalan menyelusuri setiap lokasi penelitian. Verifikaksi distribusi dan tempat pembibitan kepiting tapal kuda oleh responden dilakukan dengan meminta responden untuk menunjukkan lokasi yang pernah melihat sepasang kepiting tapal kuda kawin, juvenil, serta telur kepiting tapal kuda di temui, kami juga melakukan validasi dengan pengamatan langsung yang di lakukan di lapangan. Responden telah melaporkan bahwa pada 15 lokasi pernah melihat juvenil dan kepiting tapal kuda berpasangan. Ada satu responden yang secara langsung mengamati telur kepiting tapal kuda di pantai dan hanya sebagian yang menemukan kepiting tapal kuda bertelur. Responden yang melihat kepiting tapal kuda berpasangan pada umumnya yang berkerja sebagai nelayan. Kami menemukan 3 lokasi juvenil kepiting tapal kuda yaitu pada lokasi Tembeling, Pengujan dan Pengudang. Pada ketiga lokas tersebut ditemukan jenis Tachypleus gigas dan Carcinoscorpius rotundicauda. Kepiting tapal kuda di Pulau Bintan di manfaatkan sebagai pupuk, obat dan hiasan dinding. Dalam penelitian ini pengetahuan lokal memberikan infromasi penting mengenai distribusi potensi lokasi pemijahan dan pemanfaatan kepiting tapal kuda di pesisir Pulau Bintan.

Valuasi Ekosistem Terumbu Karang di Kawasan Konservasi Pulau Gili Matra menggunakan Analisis Emergy Hotmariyah Hotmariyah; Munasik Munasik; Puji Rahmadi
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.17134

The main problem in assessing coral reef ecosystems is selecting the right method to describe their ecological potential. The percentage of live coral cover has so far been used to indicate the condition of coral reefs. This assessment method is easy to apply but has not been able to describe the value of the ecosystem for the benefit of loss or damage to coral reef ecosystems. Further analysis based on energy use for the delivery of ecosystem services is needed, which is called Emergy analysis. This study aims to determine the value of coral reef ecosystems in the Pulau Gili Matra Marine Protected Area, Lombok, West Nusa Tenggara using Emergy analysis. Valuation of ecosystem services in the total emergy calculations is carried out by collecting data on live coral cover, biomass of zooxanthellae, reef fish and megabenthos in different management zones, i.e. core zone, utilization zone and fisheries zone. Meanwhile, energy supplies from outside the system, namely the sun and tides are also included in this total emergy calculation. The results show that the highest total emergy value is found in the core zone, 1.44E+15 sej/year while the lowest is in the fisheries zone, 2.94E+14 sej/year. Equalizing the value of the coral reef ecosystem with money, using the calculation of the Emergy to Money Ratio (EMR), the EMR value is 5.75E+07 sej per Rupiah (Rp). As a result, the value of the coral reef ecosystem is Rp 7.115.291/m2/year in the core zone and Rp 4.261.099/m2/year in the fishery zone. The value of a coral reef ecosystem can be determined from the condition of the coral reef which includes variables on live coral cover, biomass of zooxanthellae, reef fish and megabenthos. Permasalahan utama dalam penilaian ekosistem terumbu karang adalah memilih metode yang tepat untuk menggambarkan potensi ekologinya. Persentase tutupan karang hidup sejauh ini digunakan untuk menunjukkan kondisi terumbu karang. Metode penilaian ini mudah untuk diterapkan tetapi belum mampu menggambarkan nilai ekosistem untuk kepentingan kerugian atau kerusakan ekosistem terumbu karang. Diperlukan analisis lanjutan berbasis penggunaan energi untuk menyediakan layanan ekosistem yang disebut analisis Emergy. Penelitian ini bertujuan untuk mengetahui nilai (value) ekosistem terumbu karang di Kawasan Konservasi Pulau Gili Matra, Lombok, Nusa Tenggara Barat menggunakan analisis Emergy. Penilaian layanan ekosistem berupa penghitungan total emergy dilakukan melalui pengumpulan data tutupan karang hidup, biomassa zooxanthella, ikan terumbu karang dan megabentos di zona pengelolaan yang berbeda, yaitu zona inti, pemanfaatan dan perikanan. Sedangkan pasokan energi dari luar sistem, yaitu matahari dan pasang surut juga disertakan dalam perhitungan total emergy ini. Hasil menunjukkan bahwa nilai total emergy di zona inti memiliki nilai tertinggi, sebesar 1.44E+15 sej/th sedangkan yang terendah di zona perikanan yaitu 2.94E+14 sej/th. Penyetaraan nilai ekosistem terumbu karang dengan nilai uang, menggunakan perhitungan rasio emergy terhadap mata uang (Emergy to Money Ratio/EMR), nilai EMR adalah 5.75E+07 sej per Rupiah (Rp). Nilai ekosistem terumbu karang sebesar Rp. 7.115.291/m2/th di zona inti dan sebesar Rp. 4.261.099/m2/th di zona perikanan. Nilai ekosistem terumbu karang hasil analisis Emergy dapat ditentukan dari kondisi terumbu karang yang meliputi variabel tutupan karang hidup, biomassa zooxanthellae, ikan terumbu karang dan megabentos.

Komposisi dan Distribusi Sampah Laut di Pantai Pasir Putih Losari, Brebes, Jawa Tengah Rijal Amri; Cikal Kholifiyanti; Eti Sophia Wijayanti; Syamsul Bayan; Rizqi Rizaldi Hidayat; Nuning Vita Hidayati
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.15770

The coastal area is an important sector in the tourism industry, which plays as an affected area but also a contributor to marine debris. Therefore, environmental health risks due to Marine debris have become a major concern at the international, regional, and national levels. This study aims to examine the composition and spatial distribution of marine debris in the Pasir Putih beach area of Losari, Brebes. The results of this study can be used as baseline data for marine debris, as well as an evaluation of the implementation of the national action plan for handling marine debris. The method used is a field survey at 10 stations from August-October 2021. Composition and distribution analysis of marine debris is carried out based on the type, mass, and size. The marine debris found was 898 items (4,009 grams by weight). Based on its size, the marine debris was dominated by macro debris (99%). Based on the composition, 9 categories of marine debris were found: plastic, plastic foam, glass and ceramics, cloth, metal, paper and cardboard, rubber, wood, and other materials. The composition of marine waste is dominated by plastic debris (35%) and glass and ceramics (20%). Marine debris is evenly distributed in all research stations. The high level of marine debris on the beach is thought to be due to anthropogenic activities and water connectivity with residential areas around the coast. Environmental awareness education, as well as the enforcement of regulations by policymakers, are strategic actions that can be taken to overcome these problems. Wilayah pantai merupakan sektor penting dalam industri pariwisata, yang menjadi daerah terdampak tapi juga sekaligus penyumbang sampah laut. Karenanya, resiko kesehatan lingkungan akibat sampah laut telah menjadi major concern pada level internasional, regional, maupun nasional. Penelitian ini bertujuan untuk mengkaji komposisi dan distribusi spasial sampah laut di kawasan Pantai Pasir Putih Losari, Brebes. Selain itu, hasil penelitian ini dapat menjadi baseline data sampah laut, sebagai evaluasi atas implementasi rencana aksi nasional penanganan sampah laut. Metode yang digunakan adalah survei lapang pada 10 stasiun selama Agustus-Oktober 2021. Analisis komposisi dan distribusi sampah laut dilakukan berdasarkan jenis, massa, dan ukuran dari sampah laut. Sampah laut yang ditemukan sebanyak 898 item dengan berat 4.009 gram. Berdasarkan ukurannya, sampah yang ditemukan didominasi oleh sampah makro (99%) dan sampah meso (1%). Adapun berdasarkan komposisi jenisnya, ditemukan 9 kategori sampah laut yang terdiri dari plastik, busa plastik, kaca dan keramik, kain, logam, kertas dan kardus, karet, kayu, dan bahan lainnya. Komposisi sampah laut didominasi oleh sampah plastik (35%) dan kaca dan keramik (20%). sampah laut terdistribusi merata di seluruh stasiun penelitian. Tingginya sampah laut di pantai ini diduga karena aktivitas antropogenik serta konektivitas perairan dengan wilayah pemukiman di sekitar pantai. Edukasi kesadaran lingkungan serta adanya penegakan regulasi oleh pemangku kebijakan merupakan langkah strategis yang dapat dilakukan untuk mengatasi persoalan tersebut.

Spatial Distribution of Mantis Shrimp (Harpiosquilla raphidea) in Small-Scale Gillnet Fishery: A Case Study in Kuala Tungkal, Tanjung Jabung Barat Regency, Jambi Farhan Ramdhani; Septy Heltria; Ester Restiana Endang Gelis; Nofrizal Nofrizal; Romie Jhonnerie; Irfan Zidni
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.16159

Mantis Shrimp is one of economically important species due to its high value for export commodities. Mantis shrimp fishing in Kuala Tungkal is categorized as small-scale fisheries. This study aims to investigate the spatial distribution of mantis shrimp catches, both the number (individuals) and body length (BL) (cm) based on the distance from the shoreline to the fishing ground. A survey method was conducted in Kuala Tungkal, Tanjung Jabung Barat Regency, Jambi Province in December 2018. The observation covered 23 fishing trips by gillnet within 437 km2. The results revealed that the spatial distribution of the average number (individuals) of mantis shrimp in various stratifications reached 28-31 individuals. However, the farther fishing ground with higher salinity levels obtained a larger average size of mantis shrimp body length (BL). In the 0-4 mile stratification, it was found that the average catch size is 17.3 cm under the first maturity size which should be 19 cm. Meanwhile, in average the observed water condition as follow temperature is 28.2oC, DO = 7.4 mg/L, pH = 7, brightness = 1.1 m, and salinity is 20.9 ppt. At the end, the result of this spatial distribution may become an input for coastal resource management strategies and can support sustainable mantis shrimp fishing efforts.

Peranan Taurin pada Pertumbuhan dan Kelangsungan Hidup Larva Ikan Kerapu Bebek Cromileptes altivelis (Valenciennes, 1828) Regina Melianawati; Ni Wayan Widya Astuti; Tridjoko Tridjoko
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.13490

Taurine is an important amino acid for the growth of marine fish larvae The humpback grouper (Cromileptes altivelis) is a highly valuable marine fish that has been farmed in hactheries. The increasing of larval growth and survival rate of humpback grouper was carried out by taurine addition as enrichment ingredient to zooplankton as live feed for larvae. The purpose of this study was to find out the role of taurine on larval growth and survival rate. Two treatments tested were taurine addition by bioencapsulated through zooplankton rotifers Brachionus rotundiformis (A) and without taurine addition in rotifers (B). The observed parameters were larval growth and survival rate. Larval samples were taken on day 1 and 5, then continued every 5 days until the end of the study, by using10 larval samples at each time. The results showed that mostly all larvae have already metamorphosed and become juveniles at 35 days old. At that time, larvae with taurine addition (A) have bigger in size, faster growth and also higher survival rate compared than larvae without taurine addition(B). Therefore, the result of this study indicated that the addition of taurine could improve larval growth and the survival rate of humpback grouper. Taurin merupakan asam amino penting untuk pertumbuhan larva ikan laut. Ikan kerapu bebek (Cromileptes altivelis) adalah salah satu jenis ikan laut bernilai ekonomis tinggi yang sudah dapat dibudidayakan. Peningkatan pertumbuhan dan kelangsungan hidup larva ikan kerapu bebek dilakukan dengan penambahan taurin sebagai bahan pengkaya ke dalam zooplankton sebagai pakan alami larva. Tujuan penelitian ini adalah mengetahui peranan taurin pada pertumbuhan dan kelangsungan hidup larva. Dua perlakuan yang diujikan adalah penambahan taurin melalui bioenkapsulasi pada zooplankton rotifer Brachionus rotundiformis (A) dan tanpa penambahan taurin pada rotifer (B). Parameter yang diamati adalah pertumbuhan dan kelangsungan hidup larva. Sampel larva diambil pada umur 1 dan 5 hari, selanjutnya setiap 5 hari sekali hingga akhir penelitian, dengan menggunakan 10 ekor larva setiap waktu pengambilan sampel. Hasil penelitian menunjukkan bahwa sebagian besar populasi larva telah bermetamorfosis menjadi juvenil pada umur 35 hari. Pada umur tersebut, larva yang diberi penambahan taurin (A) memiliki ukuran yang lebih besar, pertumbuhan yang lebih cepat dan tingkat kelangsungan hidup yang lebih tinggi dibandingkan dengan larva yang tidak diberi penambahan taurin (B). Oleh karenanya, hasil penelitian ini menunjukkan bahwa penambahan taurin pada rotifer dapat meningkatkan pertumbuhan dan kelangsungan hidup larva ikan kerapu bebek.

Karakteristik Tinggi Gelombang Laut pada saat Periode Normal, El Niño dan La Niña di Selat Makassar Sevti Viqa Haiyqal; Aris Ismanto; Elis Indrayanti; Randy Andrianto
Jurnal Kelautan Tropis Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i1.17003

Waves are an important factor in marine science that can have positive and negative impacts on the natural conditions that affect them. Under certain conditions waves can change the coastline, damage marine life, cause tidal flooding, affect coastal buildings and so on. With the energy that waves have, they can affect all human activities such as distribution, utilization of energy sources, utilization of marine biota sources, tourism business, and development of coastal areas. Based on the influence generated, information on wave characteristics is needed based on climate variability that affects local conditions. Climate variability that affects the waters of the Makassar Strait which has a high wave pattern that follows a monsoonal pattern is the El Niño and La Niña phenomena. Using wind data and wave periods for 2013-2022 from Hindcasts-OFS BMKG, this study aims to determine the characteristics of high waves in the Makassar Strait during Normal, El Niño and La Niña phenomena. BMKG-OFS is the third generation data model of wavewatch (WW III) and has a relatively low error value with a range of 0.27 - 0.36 against the observed value of the wave recorder data installed in the Makassar Strait. From the processing it is produced during the Asian Monsoon (December, January, February) and during the Australian monsoon (June, July, August). The characteristics of high waves in the northern and central parts of the Makassar Strait are more influenced by the La Niña phenomenon than El Niño . Characteristics of the wave height in the southern part of the Makassar Strait experienced an increase in wave height both during La Niña and El Niño compared to normal. Gelombang merupakan faktor penting dalam ilmu kelautan yang dapat memberikan dampak positif dan negatif pada kondisi alam yang mempengaruhinya. Pada kondisi tertentu gelombang dapat merubah garis pantai, merusak biota laut, menyebabkan banjir rob, mempengaruhi bangunan pesisir dan lain sebagainya. Dengan energi yang dimilikinya gelombang dapat mempengaruhi segala kegiatan manusia seperti distribusi, pemanfaatan sumber enrgi, pemanfaatan sumber biota laut, bisnis pariwisata, dan pembangunan wilayah pesisir. Berdasarkan pengaruh yang ditimbulkan maka diperlukan informasi karakeristik gelombang berdasarkan varibilitas iklim yang mempengaruhi kondisi lokalnya. Variabilitas Iklim yang mempengaruhi perairan Selat Makassar a yang memiliki pola tinggi gelombang yang mengikuti pola monsunal dalah fenomena El Niño dan La Niña. Dengan menggunakan data angin dan gelombang periode 2013-2022 dari Hindcasts-OFS BMKG, penelitian ini bertujuan untuk mengetahui karakteristik tinggi gelombang di Selat Makassar saat fenomena Normal, El Niño , dan La Niña. BMKG-OFS merupakan data model generasi ketiga dari wavewacth(WW III)dan memiliki nilai error yang reltif rendah dengan rentang sebesar 0,27 - 0,36 terhadap nilai observasi data wave recorder yang terpasang di Selat Makassar. Dari pengolahannya dihasilkan pada saat Monsun Asia (Desember, Januari, Februari) maupun pada saat monsun Australia (Juni, Juli, Agustus). Karakteristik tinggi gelombang di Selat Maksassar bagian utara dan tengah lebih dipengaruhi oleh fenomena La Niña daripada El Niño . Karakteristik tinggi gelombang di Selat Makassar bagian selatan mengalami peningkatan tinggi gelombang baik saat La Niña maupun El Niño terhadap normalnya.

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Abstract

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Contact Name
-

Contact Email
-

Phone
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Journal Mail Official
-

Editorial Address
-

Location
Kota semarang,

Jawa tengah

INDONESIA