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Bioecology of coral reef in Panjang Island of Central Java Indonesia Suryono Suryono; Ambariyanto Ambariyanto; Munasik Munasik; Diah Permata Wijayanti; Raden Ario; Ibnu Pratikto; Nur Taufiq-Spj; Syahrial V. Canavaro; Tiara Anggita; Bayu Kreshna Adhitya Sumarto; Justin Cullen
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 2 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.2.125-134

Coral reefs currently are suffered from natural factors along with increasing anthropogenic activity. Panjang Island, a small reef island located in Jepara Regency, may also be experiencing such conditions. Therefore, this work was aimed to observe the condition of the coral cover of Panjang Island. Line intercept transect was applied to survey the coral cover and mortality index from fourteen stations. Insitu data consisted of the bottom substrate composition of the reefs and the physical parameters of the sea. The secondary data, i.e. coral reef area maps from 2001 to 2019 were taken from Landsat Image 7 and 8, data of wind were obtained from www.ogimet.com, while tidal data were collected from BMKG. The bathymetry was determined from the Geospatial Information Agency data, salinity global analysis forecast Phy 001.024 (CMEMS). Sea surface temperature (SST), and chlorophyll-a distribution were analyzed using ENVI software. The result showed that Panjang Island has a poor to the moderate condition of hard coral. Two out of six categories of abiotic and dead coral were found to be high. The mortality index of coral was in the high category (average 0.52). During research periods the sea waters were characterized by high sea surface temperature (29.34-30.94°C), chlorophyll-a was also tended to be high (0-2.65 mg.m-3), and an average of salinity was high 32 ‰. The weak currents came to all sides of the island, therefore the coral reef was not exposed to extreme currents. The waves came from the east, then the energy decreases after being blocked by coral reefs on the eastern side of the island, so that coral reefs in the northeast and south sides were safer to be exposed. The results suggest that hydrodynamic ecology directly or indirectly affected the percentage of coral cover and mortality index at the reefs of Panjang Island.

Kondisi Makrozoobentos (Gastropoda dan Bivalvia) Pada Ekosistem Mangrove, Pulau Pari, Kepulauan Seribu, Jakarta Meutia Shibaa Nadaa; Nur Taufiq-Spj; Sri Redjeki
Buletin Oseanografi Marina Vol 10, No 1 (2021): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v10i1.26095

Makrozoobentos merupakan indikator biologi perairan, disamping sebagai organisme sesil mereka juga mempunyai daur hidup yang relatif lama. Klass Gastropoda dan Bivalvia secara umum mempunyai kelimpahan dan keanekaragaman yang tinggi, dan senantiasa merespon kondisi kualitas air di tempat hidupnya. Penelitian ini bertujuan menganalisis struktur komunitas makrozoobenthos dan hubungannya dengan ekosistem mangrove di Pulau Pari. Purposive random sampling digunakan pada pengambilan sample dengan melihat kerapatan dan jenis vegetasi mangrove. Square plot 10 x 10 and 5 x 5 m digunakan untuk menghitung kelimpahan mangrove dan makrozoobentos (gastropoda dan bivalvia), sementara identifikasi moluska dilakukan di Lab LIPI Cibinong. Hasil menunjukkan kelimpahan mangrove dari keempat stasiun berkisar 1,200–2,700 pohon/Ha, sementara kelimpahan molusca antara 5.500-55.600 ind/Ha, dengan komposisi makrozoobentos terdapat 10 spesies gastropoda dan 1 spesies bivalvia. Keanekaragaman kedua klass termasuk pada kategori sedang (1,20-2,67), dengan keseragaman sedang (0,59-0,84) dan indeks dominansi antara 0,20-0,47. Analisis regresi hubungan kelimpahan mangrove dan makrozoobentos menunjukkan nilai 0,6498. Hal ini dapat disimpulkan bahwa pada kawasan mangrove P. Pari tidak ada jenis gastropoda ataupun bivalvia yang mendominasi, namun hubungan keduanya mengikuti kerapatan mangrove yang ada dengan nilai korelasi keduanya sebesar 0,8061.Jenis yang lebih beragam dan kelimpahan jenisnya lebih dipengaruhi oleh kerapatan mangrove sebagai tempat hidupnya. Macrozoobethos as a biological indicators aside as a sessile organisms, its also have relatively long life cycle. Gastropod and bivalvia class, are commonly have a high abundance and diversity, its always responds to the water quality conditions in their habitat. The aim of study is to analized macrozoobenthic community structure and their relationship to mangrove ecosystem at Pari Island. Purposive random sampling was used for sampling the organisms by comparing to the density and species of mangrove vegetation. Square plots of 10 x 10 and 5 x 5 m were used to calculate macrozoobenthos abundance (gastropods and bivalvia) meanwhile the identification of Gastropods and Bivalvia is in LIPI laboratory at Cibinong. The results shows that mangrove density is in between 1,200 to 2,700 inds/Ha, while composition of macrozoobenthos at Pari Island have 10 species of gastropods and one species of bivalvia. The diversity of the two classes is included into the medium category (1.20-2.67), with moderate uniformity (0.59-0.84) and the dominance index is between 0.20-0.47. The regression analysis of the relationship between mangrove and macrozoobenthic abundance is about 0.6498. It can be concluded that in the Pari Island’s mangrove area, there are no gastropods or bivalves that much dominate, but the relationship between of Gastropoda and Bivalvia is following the mangrove density with a correlation about 0.8061. More diverse types and abundance of species are affected by the density of mangroves as a place for its live.

Hidrodinamika Gelombang pada Terumbu Karang di Pulau Panjang, Jepara Suryono Suryono; Ambariyanto Ambariyanto; Munasik Munasik; Denny Nugroho Sugianto; Raden Ario; Ibnu Pratikto; Nur Taufiq-Spj; Syahrial Varrel Canavaro; Tiara Anggita
Buletin Oseanografi Marina Vol 10, No 3 (2021): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v10i3.36368

Posisi Pulau Panjang berada di sisi barat garis pantai pesisir kota Jepara, menjadikannya sebagai penghalang (barrier) terhadap gelombang yang akan menghantam pesisir Jepara. Pulau Panjang dikelilingi oleh gugusan terumbu karang. Keterpaparan (exposure) terumbu karang oleh hidrodinamika gelombang yang melewatinya perlu dikaji. Oleh sebab itu, dibutuhkan penelitian mengenai hidrodinamika gelombang pada terumbu karang di perairan Pulau Panjang. Hasil penelitian didapatkan bahwa nilai gelombang yaitu gelombang signifikan (Hs), periode gelombang signifikan (Ts) adalah bervariasi. Nilai gelombang (Hs dan Hs) tinggi, akan mengakibatkan terumbu karang pada sisi barat, timur laut dan tenggara Pulau Panjang lebih menerima keterpaparan (ekposure) oleh hidrodinamika gelombang yang melewatinya. Pada hidrodinamika gelombang lebih rendah, maka terumbu karang yang terlindung dari keterpaparan (ekposure) gelombang adalah yang berada pada sisi timur, barat daya, dan barat laut. Hasil interpolasi (Krigging) didapatkan hasil nilai Hs tertinggi berkisar antara 0,503-1,00. Arah datang gelombang dominan dari timur pulau Panjang, kemudian setelah melewati terumbu karang ada di sisi timur ,timur laut, dan utara Pulau Panjang maka energinya menjadi berkurang, sehingga terumbu karang yang ada di sisi barat, barat daya, dan selatan dari Pulau Panjang posisinya lebih aman dari keterpaparan (ekposure) oleh hidrodinamika gelombang yang melewatinya. Gelombang yang datang akan mengalami perubahan karakteristik (panjang, periode, tinggi gelombang) setelah melewati terumbu karang, sehingga gelombang yang menuju pantai akan semakin berkurang seiring dengan perubahan kedalaman. Tingkat keterpaparan (ekposure) terumbu karang yang ada pada sisi timur,timur laut dan utara di Pulau Panjang oleh gelombang cukup tinggi, hal ini diduga yang menjadi salah satu faktor penyebab kerusakan terumbu karang yang ada diperairan Pulau Panjang. The position of Pulau Panjang is on the west side of the coastal coastline of the city of Jepara, making it a barrier against waves that will hit the coast of Jepara. Panjang Island is surrounded by clusters of coral reefs. The exposure (exposure) of coral reefs by the hydrodynamics of the waves that pass through them needs to be studied. The modeling results are then generated into a shapefile map to be overlaid with a shapefile map of changes in coral reefs by interpolation method with Kriging block. The results showed that the wave value, namely the significant wave (Hs), the period of the significant wave (Ts) varied. High wave values (Hs and Hs) will result in coral reefs on the west, northeast, and southeast sides of Panjang Island receiving more exposure (exposure) by the hydrodynamics of the waves that pass through them. At lower wave hydrodynamics, the coral reefs that are protected from wave exposure are those on the east, southwest, and northwest sides. The results of interpolation (Kriging) obtained the highest Hs values ranging from 0.503 to 1.00. The direction of the dominant wave coming from the east of Panjang Island, then after passing through the coral reefs is on the east, northeast, and north of Panjang Island, the energy is reduced, so that the coral reefs on the west, southwest, and south sides of Panjang Island are safer from exposure (exposure) by the hydrodynamics of waves that pass through it. The incoming waves will experience changes in characteristics (length, period, wave height) after passing through the coral reef so that the waves towards the coast will decrease along with changes in depth. The level of exposure to coral reefs on the east, northeast, and north sides of Panjang Island by waves is quite high, this is thought to be one of the factors causing damage to coral reefs in the waters of Panjang Island.

Pengaruh Volume Air Pada Media Terhadap Pertumbuhan Panjang Dan Berat Ikan Sidat (Anguilla bicolor bicolor) Nur Taufiq-Spj; Virda Maya Definta; Raden Ario
Buletin Oseanografi Marina Vol 6, No 2 (2017): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Budidaya ikan sidat (Anguilla sp.) di Indonesia baru mulai berkembang beberapa tahun belakangan meskipun ikan ini memiliki banyak prospek di berbagai negara Asia maupun Eropa. Kegiatan budidaya yang dilakukan di beberapa daerah baru pada taraf pembesaran pada kolam persawahan (earthen pond) dan hanya sebagian kecil yang menggunakan sistim resirkulasi. Penelitian ini bertujuan untuk mengetahui pengaruh volume air terhadap pertumbuhan panjang dan berat ikan sidat (Anguilla bicolor bicolor) stadia awal dari elver dengan sistim budidaya resirkulasi. Metode eksperimental digunakan dalam penelitian ini dengan Rancangan Acak Lengkap (RAL) menggunakan 3 perlakuan volume air yang berbeda (E: 942 l, F: 1413 l, dan G: 750 l). Sampling panjang dan berat dilakukan setiap 2 minggu selama 8 minggu budidaya. Hasil penelitian pertumbuhan panjang dan berat tiap Kolam menunjukkan nilai yang tidak berbeda nyata (α > 0.05). Pertumbuhan Mutlak (berat) pada kolam E: 33,33 g, F: 23,33 g, dan kolam G: 40,00 g, sementara pertumbuhan mutlak (panjang) pada kolam E: 8,67 cm, F: 7,67 cm, serta kolam G: 9,50 cm selama 8 minggu budidaya. Hasil dari perhitungan Spesific Growth Rate (SGR) pada kolam E: 0,48; F:0,33 dan G: 0,57 %/hari selama 70 hari budidaya. Pertumbuhan panjang dan berat ikan sidat pada percobaan ini mempunyai hubungan yang sangat kuat dengan korelasi antara 83,5 – 94,5%. Hasil percobaan ini dapat disimpulkan bahwa pertumbuhan sidat stadia awal elver akan meningkat dengan menurunnya volume air pada kondisi suhu optimum 28±2 ºC. The eel (Anguilla sp.) cultivation in Indonesia recently has just begun to develop, eventhough this species has so many economic prospect especially in eastern Asia and European countries. Aquaculture activities in some province (of Indoesia) still using earthen pond and only certain places which used Resirculating Aquaculure System (RAS) for racing the local eels. The aims of this study were to determine the effect of water volume on early elver of Anguilla bicolor bicolor length and weight growth and it’s corelations. Experimental method was used, complitely random design with 3 treatments of different water volumes i.e. E: 942 liter, F: 1413 liter, and G: 750 l. Sampling were taken every fortnight during 8 weeks culture. The results shows that length and weght growth have no significantly different (α > 0.05). Absolute growth (of weight) in each tank i.e. E: 33.33 g, F: 23.33 g, and G: 40.00 g, meanwhile the length absolute growth i.e. E: 8.67 cm, F: 7.67 cm, and G: 9.50 cm. Spesific growth rate of early elver were: E = 0.48, F=0.33 and G= 0.57 ini % d-1 during 70 d culture. Length and weght growth have a tight correlation i.e. 83.5 to 94.5%. The results of this study indicate that the growth of early eel (Anguilla bicolor bicolor) increased by decreasing water volume in the optimum water temperature of 28±2 ºC.

Potensi Penyimpanan Karbon pada Lamun Spesies Enhalus acoroides dan Cymodocea serrulata Di Perairan Jepara Ken Asti Harimbi; Nur Taufiq-Spj; Ita Riniatsih
Buletin Oseanografi Marina Vol 8, No 2 (2019): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Pemanasan global telah menjadi perhatian dunia. Riset karbon dilakukan dalam upaya adaptasi dan mitigasi perubahan iklim. Ekosistem pesisir memiliki fungsi penyerap karbon di lautan (carbon sink) yang dikenal dengan istilah blue carbon. Karbon bebas yang diserap kemudian tersimpan pada sedimen dan organ pada lamun dalam bentuk biomassa. Penelitian ini bertujuan untuk menghitung estimasi stok karbon pada lamun jenis Enhalus acoroides dan Cymodocea serrulata di Teluk Awur, Jepara Jawa Tengah pada Desember 2018. Sampling survey method digunakan dalam penelitian ini. Untuk mendapatkan nilai kerapatan lamun, penentuan titik sampling lamun dengan metode purposive sampling. Analisis kandungan karbon dengan metode pengabuan, sampel lamun dicuplik 3 individu pada jenis Enhalus acoroides dan 6 individu pada jenis Cymodocea serrulatadari 27 titik sampling. Penghitungan total stok karbon dilakukan dengan konversi data biomassa hasil perhitungan kerapatan lamun menjadi kandungan karbon. Hasil analisis menunjukkan estimasi stok karbon jenis lamun Enhalus acoroides (1,07 ton/ha) lebih tinggi daripada Cymodocea serrulata (0,64 ton/ha). Hal ini dapat disimpulkan bahwa ekosistem lamun berperan sebagai carbon sink. Untuk selanjutnya diharapkan adanya pengelolaan ekosistem pesisir dan laut secara terpadu untuk mempertahankan keberadaan lamun agar kontribusi terhadap ekosistem di sekitarnya semakin stabil. Global warming has been the world's concern. This research was conducted in concern to adapt and mitigate the climate change. Coastal ecosystem has a carbon sink function in the ocean known as a blue carbon. The absorbed carbon is stored on the sediment and organ of the seagrass in the form of biomass. This research aims to estimate carbon stocks on Enhalus acoroides and Cymodocea serrulata in Teluk Awur coastal waters, Jepara of Central Java which was conducted on December 2018. Sampling survey method was used in this study. In order to find the density value of the seagrass in the field area, purposive sampling method was used to determine the sampling points. Dry-ashing method was used for analysing carbon content of the seagrass by using 3 individuals of Enhalus acoroides and 6 individuals sample of Cymodocea serrulata from 27 sampling points. The total calculation of carbon stocks is conducted by converting biomass data into carbon content. The results shows that estimation of the carbon stock of seagrass Enhalus acoroides (1.07 tons/ha) was higher than Cymodocea serrulata (0.64 tons/ha). This can be conclude that the seagrass ecosystem serves as a carbon sink, hence, it is expected that integrated coastal and marine ecosystems management can be maintained the seagrass existence in order to contributed to the surrounding ecosystem.

Analisis Kelimpahan Mikroalga Epifit Pada Lamun Enhalus acoroides Di Perairan Pulau Karimunjawa, Jepara Cantik Sitta Devayani; Retno Hartati; Nur Taufiq-Spj; Hadi Endrawati; Suryono Suryono
Buletin Oseanografi Marina Vol 8, No 2 (2019): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Padang lamun berfungsi sebagai daerah asuhan, pemijahan, tempat mencari makan dan habitat bagi biota laut, diantaranya: ikan, meiofauna, maupun mikroalga epifit. Mikroalga epifit dapat digunakan sebagai salah satu unsur indikator dalam ekosistem perairan terkait dengan kesuburan dan pencemaran. Penelitian ini bertujuan untuk mengetahui komposisi dan kelimpahan mikroalga epifit pada daun lamun Enhalus acoroides yang dilakukan pada Oktober 2018 dengan metode diskriptif. Penentuan stasiun penelitian menggunakan metode purposive random sampling dengan tiga stasiun yaitu di perairan Pantai Nyamplungan (Stasiun 1), Pantai Bobi (Stasiun 2) dan Pelabuhan Syahbandar (Stasiun 3). Sampel daun lamun E. acoroides dipotong menjadi tiga bagian, yaitu ujung (UA dan UB), tengah (TA dan TB) dan pangkal (PA dan PB) daun. Untuk mendapatkan sampel mikroalga epifit dilakukan dengan metode pengerikan. Hasil penelitian di semua stasiun ditemukan tiga kelas yakni Bacillariophyceae, Dinophyceae dan Cyanophyceae. Genus yang paling banyak ditemukan adalah Navicula, Rhizosolenia, Oscillatoria, Gonyaulax dan Prorocentrum. Kelimpahan total mikroalga epifit tertinggi terdapat pada Stasiun 3 (11.234 sel/cm2) dan terendah pada Stasiun 2 (6.717 sel/cm2). Kelimpahan mikroalga epifit pada ujung daun bagian permukaan atas (UA) menghasilkan jumlah tertinggi yakni 5.682 sel/cm² dan bagian yang terendah terdapat pada posisi tengah daun bagian permukaan bawah (TB) sebanyak 3.292 sel/cm². Posisi menempel pada bagian lamun berpengaruh terhadap kelimpahan mikro alga epifit. Seagrass bed has a function as nursery, spawning, and feeding ground, as well as a habitat for marine biota such as fish, meiofauna, and epiphytic microalgae. Epiphytic microalgae can be used as one of the indicators in aquatic ecosystems related to productivity and pollution. The aims of this study were to know the composition and abundance of epiphytic microalgae on Enhalus acoroides leaves. This research was done on October 2018 by using descriptive method. The sample was taken from three stations, ie. Nyamplungan (Station 1), Bobi Beach (Station 2) and Syahbandar Port (Station 3). The seagrass samples of Enhalus acoroides leaves were cut into three parts i.e. tip (UA & UB), middle (TA & TB) and base (PA & PB) part of the leaves to obtain the samples of epiphytic microalgae by using scratching method. The results of the study found three classes, i.e. Bacillariophyceae, Dinophyceae and Cyanophyceae. The genus most commonly found were Navicula, Rhizosolenia, Oscillatoria, Gonyaulax and Prorocentrum. The highest total abundance of epiphytic microalgae was at Station 3 (11.234 sel/cm2) and the lowest at Station 2 (6.717 sel/cm2). The abundance of epiphytic microalgae based on different part of seagrass leaves showed that the upper surface of the leaf tip (UA) has highest abundance (5.682 cell/cm²) and the bottom surface of the middle leaf (TB) has the lowest abundance (3.292 cell/cm²). The posisiton of attachment affect on the abundance of epiphyte microalgae.

Studi Kelimpahan Scylla serrata Forsskål, 1775 (Portunidae:Malacostraca) Hasil Tangkapan Musim Penghujan Di Perairan Mangkang Semarang Annisa Rahma Firdaus; Nur Taufiq-Spj; Sri Redjeki
Buletin Oseanografi Marina Vol 9, No 1 (2020): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Scylla serrata yang dikenal sebagai kepiting bakau merupakan sumber daya hayati ekosistem bakau yang hingga saat ini memiliki demand pasar yang cukup tinggi. Kondisi ini meningkatkan eksploitasi penangkapan species ini sehingga menyebabkan terganggunya populasi kepiting di alam. Penelitian ini bertujuan untuk mengetahui komposisi hasil tangkapan kepiting bakau (Scylla serrata) dengan melihat rasio kelimpahan dan hubungan lebar - berat kepiting bakau jantan dan betina dari hasil tangkapan di perairan Mangkang Wetan – Tugu, Kota Semarang, Jawa Tengah. Penelitian ini dilakukan pada musim penghujan di akhir tahun 2018 (Desember) dan awal tahun 2019 (Januari). Purposive sampling merupakan metode yang digunakan dalam penelitian ini dengan melakukan survey yang terarah dan terencana. Sampel kepiting bakau didapatkan dari hasil tangkapan nelayan yang diarahkan pada lima titik berdasarkan aktivitas yang berbeda. Hasil menunjukkan bahwa tangkapan kepiting bakau (Scylla serrata) pada Bulan Desember 2018 dan Januari 2019 di dominasi oleh kepiting jantan. Tangkapan bulan Desember 2018 memiliki rasio jantan : betina lebih besar (1,65:1) dari Januari 2019 (1,21:1). Korelasi lebar karapas dan berat kepiting bakau jantan dan betina bersifat allometrik, dimana jantan memiliki pola pertumbuhan allometrik positif sedangkan betina memiliki pola perumbuhan allometrik negatif. Dari data tersebut dapat disimpulkan bahwa populasi kepiting jantan lebih banyak ditemukan selama musim penghujan terutama di bulan Desember dan Januari. Ketidak seimbangan sex rasio ini akan menyebabkan terganggunya kestabilan populasi Scylla setrata di ekosistem estuaria Mangkang Wetan Semarang. Scylla serrata known as mangrove crab as an edible food resources of the mangrove ecosystem which has a very high market demand. Due to this conditions will be affected in increasing exploitation of this species and cause inbalancing the population in the nature. The study aims to calculate abundance ratio and width – weight correlation between male and female of the crab caught from the estuary of Mangkang Wetan Semarang, Central Java. This study conducted at the end of 2018 (December) to the first month of 2019 (Januari). Survey method was used in this study by using purposive sampling in order to get the right data aimed as a planned. The crab sample was caught by some fisherman which were dirrected at five sampling points base on different fisherman activities. The results shows that the caught seasons in the rainy time of Dec 2018 and Jan 2019, dominated by males crab (Scylla serrata). The December caught have higher sex ratio between male and female (1,65:1) compare to Januari caught (1,21:1). Correlation in carapage width and body weigth between the crabs male and female shows allometrik growth. Where, the male growth tend to have a positive allometric, while the female were negative. These can be conclude that, the male crabs were dominantly found during rainy seasons especially in December dan January. This imbalance of the sex ratio will disturb the population stability of Scylla setrata in estuary ecosystem of Mangkang Wetan Semarang.

Sebaran Mangrove di Desa Bumiharjo Kecamatan Keling Kabupaten Jepara Suryono Suryono; Nur Taufiq-SPJ; Ibnu Pratikto; Raden Ario
Buletin Oseanografi Marina Vol 9, No 2 (2020): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v9i2.29067

Kabupaten Jepara memiliki potensi wilayah pesisir dengan panjang garis pantai 81,6 km. Mangrove sebagai sabuk pantai hijau memiliki sebaran di setiap kecamatan pesisir. Salah satu lokasi sebaran mangrove di pesisir Jepara berada di desa Bumiharjo Kecamatan Keling. Identifikasi potensi luasan lahan serta sebaran mangrove adalah salah upaya mengetahui potensi sumberdaya pesisir. Metode penelitian yang digunakan adalah overlay peta RBI dan peta satelit landsat 8 guna mengetahui lokasi serta luasan sebaran mangrove di lokasi penelitian.Selanjutnya dilakukan investigasi ekologi mangrove dengan Survei Lapang guna mengetahui distribusi dan kelimpahan mangrove. Hasil penelitian menunjukan bahwa hutan mangrove dilokasi penelitian adalah seluas 4,75 Ha. Hasil identifikasi komposisi jenis mangrove ditemukan sebanyak 6 spesies mangrove yaitu: Avicennia marina, Rhizophora apiculata, Rhizophora stylosa, Rhizophora mucronata, Soneratia alba, serta Soneratia muconata. Kerapatan rata-rata vegetasi mangrove berkisar antara 4000 – 10.000 individu/ha. Tegakan mangrove memiliki tinggi batang 5-6 meter, diameter batang berkisara antara 4,3- 5,0 cm. Kerapatan mangrove didominasi oleh Rhizophora mucronata. dengan kerapatan paling dominan adalah semai (Sapling). Hal ini menunjukan bahwa mangrove yang ada di desa Bumiharjo Kecamatan Keling kabupaten Jepara adalah dominan mangrove hasil replant. Jepara Regency has a potential coastal area with a coastline length of 81.6 km. Mangroves as coastal green belts have distribution in each coastal district. One of the mangrove distribution locations on the coast of Jepara is in the village of Bumiharjo, Keling district. Identification of the potential land area and the distribution of mangroves is an effort to determine the potential of coastal resources. The research method used is an overlay RBI map and satellite map Landsat 8 to determine the location and extent of the distribution of mangroves in research locations. Subsequently carried out an investigation of mangrove ecology with a Field Survey (Ground Truth) to determine the distribution and abundance of mangroves. The results showed that the mangrove forest in the study area was 4.75 Ha. The results of the identification of the composition of mangrove species were found as many as 6 species of mangroves, namely: Avicennia marina, Rhizophora apiculata, Rhizophora stylosa, Rhizophora mucronata, Soneratia alba, and Soneratia muconata. the average density of mangrove vegetation ranges between 4000 - 10,000 individuals/ha. Mangrove stand has a stem height of 5-6 meters. the diameter of the stem is between 4.3 - 5.0 cm. Mangrove density is dominated by Rizophora mucronata. with the most dominant density is the seedling (Sapling). This shows that the mangroves on the coast of the Jepara district are replanted mangrove species. (rehabilitation).

Produksi Garam Dan Bittern Di Tambak Garam Nur Taufiq-SPJ; Retno Hartati; Widianingsih Widianingsih
Jurnal Kelautan Tropis Vol 19, No 1 (2016): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Rembang Regency could be named as Salt City because they have very high production after Pati Regency. Along the road of Juwana (Pati) - Rembang, salt pond could be seen as square salt sea equipped with windmill to take the sea water from the channel into the pond and is processed into salt. Although salt localproduction is sufficient enough for raw material of industry, therefore best practical technology it is needed. The objective of present work are to improve directly the process of salt production and basic technique for diversiificatio of salt production, i.e. salt and bittern. The result of present works as follows. Getrape type salt pond is applied, where young water embankment is located upstream and the down to seed pond 1, 2, 3, then distributed to cristalization pan. Seawater is taken through primary dykes to pump at elevation of 1.5 m, so still full of water during high tide. On cristalization pan (size of 200 m2) sea water will be settled during 7–10 days until its cristalized. Salt cristal was located under bittern solution could be scrap and collected in collection point. The left-after bittern of 29–30° Be could be flowed back into seed pan uo be collected in bitter collection point.

Sebaran Ikan Sidat (Ikan Katadromus) di Perairan Sungai Lorok Ngadirojo, Kabupaten Pacitan, Jawa Timur Muhammad Arif Romadhi; Agus Indarjo; Chrisna Adhi Suryono; Nur Taufiq-Spj
Journal of Marine Research Vol 11, No 2 (2022): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v11i2.33797

Ikan sidat Anguilla sp. merupakan kategori ikan yang bermigrasi secara katadromous, artinya ikan sidat mengawali hidup di laut yang bermigrasi ke perairan tawar untuk tumbuh menjadi sidat dewasa dan kembali ke laut untuk melakukan pemijahan (spawning migration). Penelitian ini bertujuan untuk melakukan klasifikasi jenis dan ukuran panjang kelompok sebaran ikan Sidat di Perairan Ngadirojo, Kabupaten Pacitan. Penentuan kelompok menggunakan metode morfometrik dan jenis sampel menggunakan A/D%. Hasil menunjukkan distribusi ikan sidat yang ditemukan di Muara Sungai Lorok terdapat dua spesies, yaitu Anguilla bicolor dan Anguilla marmorata. Frekuensi ukuran panjang distribusi benih ikan sidat (glass eel) kisaran ukuran panjang total 4,8 cm hingga 7,56 cm dengan rata – rata 6,0 ± 0,9 hingga dan Sedangkan ukuran panjang distribusi sidat muda (yellow eel) kisaran ukuran panjang 37,98 cm hingga 48,0 cm dengan rata – rata 43,2 ± 3,1. Analisis uji beda mendapatkan nilai signifikansi (p= 0,00 < 0,01) maka adanya perbedaan ukuran panjang antara stasiun di aliran SungaI Lorok. Freswater eels Anguilla sp. is a category of fish that cathadromous migrate, that eel fish begin to live in the sea that migrates to fresh waters to grow into adult eels and returns to the sea to spawning migration. This study aims to classify the type and size of the length of the Eel fish distribution group in Ngadirojo Waters, Pacitan Regency. This study aims to classify the type and size of the length of the Eel fish distribution group in Ngadirojo Waters, Pacitan Regency. Group determination using morphometric methods and sample types using A/D%. The results showed that the distribution of eel fish found in the Lorok River was two species, namely Anguilla bicolor and Anguilla marmorata. The frequency of the length distribution of glass eel seeds (glass eel) ranges in total length from 4.8 cm to 7.56 cm with an average of 6.0 ± 0.9 to and. 37.98 cm to 48.0 cm with an average of 43.2 ± 3.1. The analysis of the difference test got a significance value of (p= 0,00 < 0,01), so there is a difference in length between stations in the Lorok River flow.

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