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Struktur Populasi dan Distribusi Kerang Totok Geloina sp. (Bivalvia: Corbiculidae) di Segara Anakan Cilacap Ditinjau dari Aspek Degradasi Salinitas

ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 11, No 1 (2006): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Segara Anakan merupakan salah satu estuaria terbesar di Pulau Jawa yang terkenal dengan keanekaragaman hayatinya. Diantara biota yang terdapat adalah kerang Totok (Geloina sp) yang berasosiasi dengan hutan mangrove. Kerang ini memiliki nilai ekonomis  yang cukup tinggi sehingga banyak dimanfaatkan oleh masyarakat. Namun informasi mengenai sifat-sifat ekologisnya belum banyak diketahui biologisnya. Tujuan dari penelitian ini adalah untuk mengetahui distribusi dan stuktur populasi kerang Geloina sp tersebut. Penelitian dilakukan pada bulan Juli -Oktober 2005 di Segara Anakan Cilacap pada empat stasiun yang berbeda salinitasnya (13, 15, 30 dan 32 ppt). Sifat penelitian adalah studi kasus, metoda pengambilan sampel yang digunakan adalah metoda sampling area. Data yang diambil meliputi kerang dan kondisi perairan. Data yang didapatkan dikelompokan berdasarkan kelas ukuran panjang cangkang selanjutnya dilakukan uji chi kwadrat untuk menentukan pola sebaran. Hasil penelitian menunjukan kerang yang didapat adalah Geloina sp dengan pola sebaran merata pada keempat stasiun penelitian yang berbeda salinitasnya. Adapun kepas ukuran kerang yang didapat dalam keempat stasiun dapat dikelompokan menjadi kelas ukuran <3; 3 – 3,9;   4 – 4,9; 5 – 5,9; 6 – 6,9; 7 – 7,9; >8 cm. Populasi kerang terbanyak pada semua stasiun adalah kelas ukuran 6 – 6,9 cm Kata kunci : Segara Anakan, Geloina sp, salinitas  Segara Anakan is the largest estuary in Java Island and it has high biodiversity. One of fauna found which associated with the mangroves is Totok mussel Geloina sp. That mussel has economic value so that faced high exploited along season. Considering that condition a study of distribution and their population structure was very importance. The research was carried out on July – October 2005 in Segara Anakan Cilacap on different station which had different salinity (13, 15, 30 and 32 ppt). The case study type research and sampling area method was used to collect the data of information of the Geloina sp. The data collected in the field are mussel population and water quality condition where the mussel life. The data of mussel ware grouped in several classes of length and followed by chi quadrant test to define the distribution of Geloina sp. The result of the study showed that the Geloina sp was uniform distributed along the four station which had different salinity and the class of length mussel was found <3; 3 – 3.9; 4 – 4.9; 5 – 5.9; 6 – 6.9; 7 – 7.9; >8 cm. The class length of 6 – 6,9 cm was the highest number of mussel found in Segara Anakan Key words : Segara Anakan, Geloina sp, salinity

Struktur Komunitas Gastropoda Di Perairan Pesisir Kecamatan Genuk Kota Semarang

Journal of Marine Research Vol 1, No 1 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Gastropods have an important role in aquatic environments, especially in food and energy cycles. This aim of study determine the abundance and structure community of gastropods and physical parameters of the water, the type of substrate sediments and organic matter content in sediments that serve to optimize the utilization analysis and estimation of the abundance of gastropods conditions contained in the Genuk Coastal Waters, the city of Semarang. The method used in this research descriptive method by means of sampling stations gastropods includes 6 points. The study results for all sampling points had 260 individuals, that comprise of 10 species, namely Turricula javana, Thaislacera, Murex trapa, Bufonaria rana linnaeus, Nassarius sp, Natica tigrina, Babylonia spirata, Turritella terebra, Pseudoneptunea varicosa, and Conus sp. Sum abundance of species ranging between 0,08 to 2,37 individu/m2. Value index of diversity (H) ranged from 0,000 to 2,026 in the category of low and moderate, and values of uniformity index (e) ranged from 0,000 to 1,461 are included in the high category and the dominance index (c) between 0,255 to 1 in the category of not no dominance (TAD) and no dominance (AD), and for the distribution patterns are dominated by the uniform distribution pattern from the clumped distribution patterns whereas community similarity (S) category was up to the height ranges between 44,44% - 88,89%.

IDENTIFIKASI DAERAH RAWAN ROB UNTUK EVALUASI TATA RUANG PEMUKIMAN DI KABUPATEN DEMAK

Journal of Marine Research Vol 2, No 3 (2013) : Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Banjir rob is when an area inundated during the highest tide and low tide again at the lowest tide. The factor of banjir rob is the height of land, land subsidence, the distance from coastal, and the distance from river. Identification of rob prone areas in Demak is a measure of disaster mitigation to minimize the negative impact of the banjir rob that inundated settlement areas. The purpose of this study is to map the rob prone areas and evaluate the rob prone areas to the spatial planning of settlement area in Demak District. There are five classes of rob prone that inundating settlement area in Demak including the very prone class 14.464 ha, prone class 103.906 ha, the less safe class 335.472 ha, safe class 877.394 ha, very safe class 117 1,527 ha. Areas that included in very prone and prone classes are in Sriwulan Village, Bedono, Timbul loko, Bedono, Surodadi, Tambak bulusan, Morodemak, Purworejo, Betahwalang, Wedung, Berahankulon, and Kedungmutih. Areas that included in less safe, safe, and very safe spread classes are spreading on all villages in Demak District.

Distribusi dan Kelas Ukuran Panjang Kerang Darah (Anadara granosa) di Perairan Pesisir Kecamatan Genuk, Kota Semarang

Journal of Marine Research Vol 1, No 1 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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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.

Studi Reproduksi dan Morfometri Ikan Sembilang (Plotosus canius) Betina yang Didaratkan di Pengepul Wilayah Krobokan Semarang

Journal of Marine Research Vol 1, No 2 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

One of the fish part of family Plotosidae are Sembilang. This marine fish are usually consumed by the peoples as smoked fish. Peoples know well this fish became of their good teste and has quite nutritious. Although Sembilang not been many studied, but research on aspects of reproduction and morphometry of Sembilang is necessary to prevent the decline in this fish populations. The research was conducted in October 2011 and was continued in April 2012. The samples of the fish taken in the fish landing base in Krobokan, Semarang region. The total number of the fish samples taken as many as 30 fish, with the length between 35 cm to 70 cm and total weight ranged from 250 grams to 1600 grams. The results of the data analysis for the GSI values in both periods (October 2011 and April 2012) obtained between 5,583 % to 33,417 %. The values of Lm in the study period of October 2011 was 36,808 cm and in period of April 2012 was 26,927 cm. Diameter of fish eggs obtained from the both periods (October 2011 and April 2012) between 0,1 cm to 0,8 cm. Length and weight regression of fish in the October 2011 showed W=(0,0171)L2,691 and in the April 2012 showed W=(0,0234)L2,621. The values of condition factor in the October 2011 between 0,843 to 1,111 and in the April 2012 between 0,812 to 1,324.

Studi Akumulasi Logam Tembaga (Cu) dan Efeknya terhadap Struktur Akar Mangrove (Rhizophora mucronata)

Journal of Marine Research Vol 2, No 4 (2013) : Journal of Marine Research
Publisher : Journal of Marine Research

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Copper metal (Cu) is one of the heavy metals that can contaminate the environment, especially water. Cu is a heavy metal which is harmful to human health, but Cu is also needed in our life as trace elements. This study aimed to determine the effect of Cu contaminants with different concentrations on the root structure of the mangrove seedlings Rhizophora mucronata for 30 days of observation. Rhizophora mucronata is taken from Tapak village, Tugu, Semarang, Central Java. The research was carried out from June to August 2012 at the Marine Science Campus of Diponegoro University Semarang. A laboratory experiment research was conducted on the effect of different Cu concentrationt (20, 100 and 500 ppm) and different exposure material (10, 20 and 30 days) on the root structure of mangrove Rhizophora mucronata. Root structure using microscopy observations performed at the Laboratory of Plant Faculty of Science and Mathematics, Diponegoro University. The result demonstrated that the root of epidermis, cortex, endodermis, xylem and phloem had no effect on their structure after exposure to concentration of Cu of 20, 100 and 500 ppm since there were not change on their shape compared to the control.

DISTRIBUSI KELAS UKURAN KERANG SIMPING PINGGIR (Placuna Placenta, Linn, 1758 :Pelecypoda) DI PERAIRAN GENUK SEMARANG

Journal of Marine Research Vol 3, No 1 (2014) : Journal of Marine Research
Publisher : Journal of Marine Research

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Placuna placenta are often called scallop shells included in the phylum mollusca, Pelecypoda Class, and Family Placunidae. The research was held on October until December 2012. The research was conducted at the research 8 stations. The materials have been used are scallop shells, sea water, and the substrate of water base. The method used in this research is descriptive method and purposive sampling method as the method in determining the location of doing research with interval of 1 month. The result of this research is that the distribution of scallop shells in Genuk waters found in October was 63 ind / ha, in November 582 Ind / ha and in December 155 ind/ha. The Results of the linear regression about relationship length and weight of the Scallop shells in the period October- December included on negative allometric because the regression coefficient (b) less than 3. The abundance of scallop shells on research site influenced waters condition quality and the organic materials in sediment.

Epibion Makrofit Pantai Berpasir di Kabupaten Jepara, Jawa Tengah (Epibiont Macrophyte on Sandy Beach, in the Regency of Jepara, Central Java)

ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 18, No 1 (2013): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Epibion merupakan organisme yang hidup melekat pada berbagai jenis substrat alamiah di dasar perairan dan berperan penting sebagai pemakan sisa. Bandengan dan Pulau Panjang adalah dua lokasi pantai berpasir yang terletak berdekatan di Kabupaten Jepara Jawa Tengah. Studi ini menginvestigasi epibion pada makrofit, yaitu makroalgae dan lamun di kedua lokasi, dengan metode survei. Epibion utama kedua jenis makrofit tersebut adalah mikroalgae dan mikrozoobentos, dengan jumlah dan keanekaragaman yang relatif tidak berbeda. Secara lebih detil, epibion utama makroalgae umumnya adalah mikroalgae planktonik dan mikrozoobentos, sedangkan epibion utama lamun adalah mikroalgae planktonik yang bersifat epifit. Struktur komunitas bentik yang mengandung Polychaeta dalam jumlah jenis dan jumlah individu terbanyak dibandingkan Crustacea dan Mollusca, dan tidak dijumpainya genera lamun pionir Halophila dan Halodule di kedua lokasi, mengindikasikan masih cukup baiknya kualitas hayati kedua pantai wisata tersebut. Kata kunci: epibion, lamun, makroalga,  pantai berpasir, Jepara Epibiont ​​is known as living organisms attached to various natural benthic substrates and plays an important role as scavenger. Bandengan and Pulau Panjang are two sandy beaches close to each other located at Jepara, Central Java. This study investigates epibionts on macrophytes, which are macroalgae and seagrasses in both locations, by means of survey method. In general, major constituent of epibionts in those two macrophytes are microalgae and microzoobenthos, with relatively similar individual number and diversity. In more details, epibionts in macroalgae is planktonic microalgae and microzoobenthos, whereas, for seagrass it is of epiphytic microalgae. Benthic community structure which have more abundant and more diverse Polychaeta compared to that of Crustacea and Mollusca, combined with no existence of pioneer seagrass, i.e., Halophila and Halodule indicating that both beaches have still retained relatively good quality ecosystem for tourism. Keywords: epibiont, seagrass, macroalgae, sandy beach, Jepara

Pertumbuhan Kepiting Bakau Scylla serrata di Kawasan Mangove

BULETIN OSEANOGRAFI MARINA Vol 1, No 5 (2012): Buletin Oseanografi Marina
Publisher : BULETIN OSEANOGRAFI MARINA

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Abstract

Lahan mangrove mempunyai potensi dikembangkan untuk usaha penggemukan kepiting tanpa merusak, yaitu melalui konsep silvofishery.  Tujuan dari penelitian ini adalah menjajaki pemeliharan kepiting bakau Scylla serrata didaerah mangrove dan mencari kepadatan optimal. Metoda yang digunakan adalah eksperimen dengan rancangan acak kelompok.  Perlakuan yang diterapkan adalah kepadatan yang berbeda (4 ekor/m2, 6 ekor/m2 dan 8 ekor/m2) dengan kelompok (daerah mangrove dan non-mangrove) dan dengan ulangan 3 kali.  Data yang diperoleh berupa penambahan berat badan dianalisa dengan balanced designs anova. Hasil yang didapat menunjukan kepiting bakau yang dipelihara didaerah mangrove memiliki penambahan berat yang lebih besar bila dibandingkan dengan yang dipelihara diluar daerah mangrove.  Kepiting bakau yang dipelihara didaerah mangrove dengan kepadatan 4 ekor/m2 pertambahan berat rata rata 81,7 gr/bulan; dan kepadatan 6 ekor/m2 bertambah rata rata 77,8 gr/bulan, sedang kepadatan 8 ekor/m2 73,9 gr/bulan.  Hal tersebut sangat berbeda dengan kepiting yang dipelihara pada daerah yang tidak bermangrove dimana untuk kepadatan 4 ekor/m2 rata rata hanya bertambah 68,75 gr/bulan dan yang berkepadatan kepadatan 6 ekor/m2 bertambah rata rata 39,1 gr/bulan sedangkan yang berkepadatan 8 ekor/m2 32,2 gr/bulan.  Interaksi antara kepadatan dan lokasi (bermangrove dan bukan) memberikan pengaruh yang sangat nyata pada penambahan berat kepiting bakau (p<0,001).   Kata kunci : Kepiting bakau, pertumbuhan dan mangrove

Komposisi dan Kelimpahan Ichtyofauna di Perairan Morosari, Kecamatan Sayung, Kabupaten Demak

BULETIN OSEANOGRAFI MARINA Vol 1, No 5 (2012): Buletin Oseanografi Marina
Publisher : BULETIN OSEANOGRAFI MARINA

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Abstract

Keberadaan ichtyofauna terkait erat dengan fungsi ekologis wilayah Perairan Morosari, Kec. Sayung, Kab. Demak. Dampak dari rob / pasang tinggi (kenaikan muka air laut akibat pasang tinggi) adalah tergenangnya sebagian wilayah pertambakan menjadi perairan dangkal. Penelitian ini bertujuan tujuan melakukan inventarisasi berbagai jenis ikan serta kelimpahannya. Materi yang digunakan adalah ichtyofauna yang diambil di perairan pantai Perairan Morosari, Kec. Sayung, Kab. Demak. Penelitian dilakukan dengan pengambilan sampel secara langsung pada enam stasiun, dari Maret sampai dengan Oktober 2011. Sampling dilakukan bulanan, dengan mengambil waktu pasang tertinggi. Sampling biota ichtyofauna dilakukan dengan menggunakan Trap Net (Bubu) dan Lift Net. Hasil penelitian mendapatkan 15 Famili dengan 19 species ichtyofauna. Kelimpahan Total ichtyofauna berkisar diantara 607 – 1221 ekor. Jenis – jenis dan kelimpahan ichtyofauna tersebut terkait dengan siklus hidup dan strategi untuk kelangsungan hidup.   Kata kunci : Ichtyofauna, Jenis, Kelimpahan, Demak