Ria Azizah
Fakultas Perikanan dan Ilmu Kelautan Universitas Diponegoro, Semarang, Indonesia
Articles
6
Documents
Pengaruh Kadar Air Terhadap Laju Respirasi Tanah Tambak pada Penggunaan Katul Padi Sebagai Priming Agent

ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 2 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Kualitas tanah tambak merupakan salah satu kunci keberhasilan bubidaya udang, sehingga manajemen pengelolaan tanah tambak mempunyai peran penting dalam menentukan kualitas tanah tambak. Tanah tambak merupakan tempat akumulasi limbah internal tambak yang berasal dari sisa pakan, kotoran udang dan bangkai organisme tambak. Dampak dari bahan organik tersebut dapat dikurangi melalui prinsip ekologi dengan menggunakan tehnik bioremediasi. Penguraian bahan organik dipengaruhi oleh kadar air, sehingga pengaturan kadar air diharapkan mampu meningkatkan laju respirasi tanah tambak. Tujuan dari penelitian iniadalah untuk mengetahui pengaruh kadar air terhadap laju respirasi tanah tambak pada pemberian katul sebagai priming agent. Penelitian menggunakan metode eksperimental dengan rancangan acak lengkap. Perlakuan yang digunakan adalah kadar air 15%, 30% dan 45%, masing-masing dengan pengulangan sembilan kali. Parameter kualitas tanah yang diamati meliputi: total bahan organik, kadar air, N-organik, C-organik dan pH. Berdasarkan hasil pengama tan selama 12 hari menunjukkan bahwa kadar air dapat meningkatkan laju respirasi tanah tambak udang. Laju respirasi tertinggi dicapai oleh perlakuan dengan kadar air 45% sebesar 222,312 mgC/kg tanah per hari, dan disusul berturut-turut oleh perlakuan dengan kadar air 30%, dan perlakuan dengan kadar air 25%, yaitu masing-masing sebesar 215,528 mgC/kg tanah per hari; dan 96,312 mgC/kg tanah per hari.Kata kunci: kadar air, bahan organik, tanah dasar tambak dan laju respirasi.The quality of pond soil are one of the most factor in growth of the shrimp. Pond soil is place of accumulated of pond soil terminal waste are coming from the remained of feed, shrimp exrement and the carrior of the pond soil organism. Waste effect could be decreasing by the ecological principle by using bioremidioation technique. The decomposition of organic matter of bacteria activities extremely influence by moisture. The controlling of moisture could be increasing the respiration rate of pond soil. The purpose of this research is to know the influence of moisture to the respiration rate of pond soil on the use of rice bran as priming agent. The research use experimental method with complete random approach. There are three treatment of moisrureare 15%, 30 % and 45%, nine repeated for each treatment. The taken of soil parameters are the total organic matter, moisture, C-organic, N-organic and pH. According to the observation result during 12 days indicated that the influence of the moisure treatmnet could be increasing the respiration rate of pond soil. In this research the respioration rate from the higgest to the lower are 45% ( 222,312 mgC/kg soil/24 hours); 30% (215,528 mgC/kg soil/24 hours) and 25 % (96,312 mgC/kg soil/24 hours).Key words: Moisture, organic matter, pond bottom soil and respiration rate.

Perendaman pada Waktu dan Sumber Air yang Berbeda Terhadap Mortalitas dan Penempelan Balanus spp.

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

Penelitian ini dilakukan untuk mengetahui mortalitas teritip (Balanus spp.) pada kolektor kayu yang mendapat waktu perendaman yang berbeda dan efek perendaman kayu dalam air tawar terhadap penempelan dan pelepasan teritip (Balanus spp.). Teritip (Balanus spp.) yang dipakai dalam penelitian berasal dari perairan Tambak Lorok di sekitar muara sungai Banjir Kanal Timur. Secara garis besar penelitian terbagi 2 : (1) Pengamatan di lapangan untuk pengumpulan teritip dan (2) Percobaan (indoor) untuk penglepasan teritip dan pengujian kekuatan kayu. Hasil penelitian menunjukkan bahwa lama perendaman teritip dalam air tawar berpengaruh nyata terhadap mortalitas teritip. Penelitian ini juga menunjukkan bahwa perendaman kolektor kayu dalam air sungai selama 4 minggu sebelum dipasang sebagai kolektor dapat menurunkan penempelan larva sampai 10–20%. Hal ini dapat memberikan implikasi positif dalam pemeliharaan perahu nelayan. Kayu-kayu yang sebelumnya direndam dalam air tawar tidak ditempeli teritip sampai hari ke-8, sedangkan pada kayu yang sebelumnya tidak direndam, sudah ditempeli teritip pada hari ke-2. Teritip yang sudah mati lebih mudah lepas  cangkangnya pada permukaan kayu yang  sebelum dipasang sebagai kolektor direndam dahulu dalam air sungai (56 %), dibanding pada kayu yang tidak direndam (1,6 %). Hasil pengujian material menunjukkan bahwa kekuatan kayu sebelum dan sesudah perendaman air tawar relatif konstan. Kata kunci : perendaman, Balanus spp., mortalitas, penempelan An experiment was conducted with aims to investigate mortality of the barnacle exposed to different time regimes in freshwater dan to  investigate the preventive effects of freshwater-dipping in wooden-plates upon the attachment of cyprids/larvae of the acorn-bernacles Balanus spp. The bernacles were collective from the coastal site of  Tambak Lorok in the vicinity of the river mouth Banjir Kanal Timur. The experiments was divided into 2 parts : filed observation and material collection at Tambak Lorok, and indoor experiment. It was shown that dipping of the wooden plates in river for weeks prior to collector setting may reduce the attachment of cyprid larvae by 10–20%. This result might have positive implication in the maintenance of wooden fishing boots. The wooden materials (dipped in river water prior to usage) may not be attached by cyprids until day-8, compared to day-2 in untreated materials. It was also evident that exposure time in freshwater, both in river water and well-water have highly significant effect upon the mortality of barnacle. The removal of the dead barnacle shells occurred in much greater numbers on the wooden plates dipped in river water prior to setting up as larval collector (56 %), than in untreated materials (1,6 %). The result of material tests showed that the strenght of the wooden materials remained relatively constant prior and after freshwater exposure.Key words: dipping, Balanus spp., attachment, mortality

PENGARUH PENGGUNAAN DIVINE CIGARETTE TERHADAP LAJU PERTUMBUHAN IKAN BANDENG (Chanos chanos Forskåll, 1775)

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

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Abstract

Market demand for milkfish (C. chanos Forskåll, 1775) is continually to increase, since it is used for consumption and live bait for tuna and skipjack. The purpose of this research was to determine the effect of the Divine cigarette fumigation in fish feed on the growth of milkfish (C. chanos Forskåll, 1775). This research used experimental laboratories method with 4 treatments and 3 replications. The first treatment (A) was fumigation the Divine cigarette on fish feed for 5 minutes, the second treatment (B) for 10 minutes, the third treatment (C) for 15 minutes, and the fourth treatment (K) for without fumigation (control). Results of this research showed the highest specific growth rate was obtioned in treatment C which was equal to 2.51% daily. The lowest of mercury content was on the treatment A and C, resulting in decreased levels of mercury in milkfish (C. chanos Forskåll, 1775). Based on the result it can be concluced that the fumigation treatment of Divine cigarette for 15 minutes in fish feed can increased the specific growth rate of the milkfish (C. chanos Forskåll, 1775).

Struktur Komunitas Zooplankton di Ekosistem Lamun Alami dan Berbagai Lamun Buatan Perairan Teluk Awur, Jepara

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

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Abstract

Zooplankton are one component in the food chain as measured in relation to the productivity value of an ecosystem. This is because the zooplankton is a major connecting link between plankton and nekton. Teluk Awur Waters are shallow waters with depths less than 10 meters. These waters are also under pressure from various human activities. The aim of this research were to find out the community structure of Zooplankton on native and artificial seagrass ecosystems in Teluk Awur waters, Jepara. The method of this research was a case study method with the exploratory nature of data collection used Sample Survey Method. The location was set as a research Station was the Station 1, as the native seagrass, and Station 2, 3, and 4 as the artificial seagrass. Sampling was conducted every 2 weeks for 4 times of sampling of each 3 times making use planktonnet with mesh size 45 μm. Sampling was carried out horizontally in the morning on July 2012 to September 2012. The results obtained 37 genera on native seagrass, while on the third of artificial seagrass was obtained 51 genera. Abundance obtained on the native seagrass was an average of 3845,482 specs/L and on the artificial seagrass was an average of 3146,303 specs/L. Diversity of zooplankton showed the medium diversity, an average of 2,08 obtained on the native seagrass and an average of 2,15 obtained on the artificial seagrass. Homogenity obtained average of 0,48 on the native seagrass and 0,50 on the artificial seagrass which is showed that the level of homogeneity is in medium range. The index of domination on the native seagrass was obtained an average 0,51 which is showed that the level of dominance is in medium range and on the artificial was obtained an average 0,49 which is showed that the level of dominance is in low range.

Analisis Kelayakan Investasi Pada Budidaya Karamba Jala Apung (KJA) Ikan Kerapu Di Kepulauan Karimunjawa Kabupaten Jepara

BULETIN OSEANOGRAFI MARINA Vol 6, No 2 (2017): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

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Abstract

Kajian Investasi budidaya ikan kerapu di Karimunjawa adalah salah satu usaha guna menumbuhkan promosi investasi di wilayah studi. Kajian ini akan membuat peluang investasi menjadi lebih fokus dan tajam baik dari segi sektor maupun lokasinya, sehingga akan memudahkan investor guna merealisasikan rencana bisnisnya. Studi ini akan memberikan detail informasi kepada investor tentang peluang bisnis pada budidaya ikan kerapu yang sangat layak dilakukan sehingga dapat meningkatkan pertumbuhan ekonomi masyarakat pesisir dan wilayah kabupaten Jepara pada umumnya. Metode yang digunakan adalah metode survei. Peluang Investasi dianalisa secara deskriptif. Hasil kajian menunjukan bahwa berdasakan potensi alam, fasilitas infrastruktur produksi, nilai ekonomi serta aspek financial maka kelayakan investasi adalah sangat prospektif dan berpeluang untuk sukses. Analisis financial menunjukan bahwa investasi pada budidaya ikan kerapu di Karimunjawa adalah sangat layak untukdirealisasikan bagi investor. Budidaya ikan kerapu Tikus (Cromileptis altivelis)adalah paling prospektif, dimana nilai Net Present Value (NPV)> 0,yaitu  1,772,764,729,  dan  Profitability Index  (PI) lebih besar dari  1, yaitu 5,543291036.  Payback Periodadalah  2.82 tahun, jika tidak mempertimbangkan nilai uang (Discount Factors) dan 3.65 tahun  jika mempertimbangkan nilai uang. Sedangkan untuk budidaya ikan kerapu bebek(Ephinephelus fuscoguttatus), Net Present Value (NPV)> 0 yaitu  69,938,924, - dan Profitability Index (PI) lebih besar dari 1, yaitu 1,20558783.  (Pay Back Period) adalah  4,13tahun apabila tidak mempertimbangkan nilai uang (Discount Factor), sedangkan apabila mempertimbangkan nilai uang maka menjadi  and 4.64 tahun. Dari analisis yang dilakukan, maka dapat disimpulkan bahwa meskipun kedua spesies ikan kerapu layak investasi, tetapi ikan kerapu tikuspaling layak investasi, sedangkan ikan kerapu macansebagai produk sampingan investasi, yaitu dengan memanfaatkan sisa pakan yang tidak digunakan dalam budidaya ikan kerapu tikus, sehingga hasilnya akan dapat maksimal. Keseluruhan aspek yang dikaji menunjukan bahwa budiddaya ikan kerapu di Kepulauan Karimunjawa adalah layak investasi. The study of feasibility floating cage culture of grouper fish investment in Karimunjawa is one of the efforts for investment promotion in the studied region. This study will make the investment opportunities become more focus and sharp, both sectoral and location, so it will be easier for investors to execute their investment interest. The purpose of this study, is to provide initial information for investors about business opportunities of grouper fish farming as a very feasible investment opportunities so that can boost the economy of the region and the society of Jepara Regency. The method used in this study was survey  method, descriptive analysiswas conducted to see a of investment opportunities. Based on potential natural resources, location, infrastructure facilities, production, economy value, and financial aspect, the  results of study concluded  that the overall investment is highly prospective and has a fairly high chance to success. The financial analysis showed that investment in grouper fish cultivation in jepara regency is very feasible as a business investment for the investors. Humpback or Polka dot grouper (Cromileptis altivelis) culture is highly prospective and has a fairly high chance. This can be seen from the Net Present Value (NPV) > 0 is equal to 1,772,764,729,  and Profitability Index  (PI) value greater than 1, which is 5,543291036.  While the longer the period the funds invested will return (Payback Period) is 2.82 years if the without considering the time value of money (Discount Factors) and 3.65 years when considering the time value of money. Whereas,  for Brown marbled grouper (Ephinephelus fuscoguttatus), the Net Present Value (NPV) > 0 is equal to  69,938,924, - and Profitability Index (PI) greater than 1, which is 1,20558783. While the longer  period the funds invested will return (Pay Back Period) are 4,13 year if without considering the time value of money (Discount Factors) and 4.64 years when considering the time value of money. From the analysis it can be concluded that all these choices on the investment plan is feasible to run and prospective advantageous. While the best option is an investment plan on investments Humback or Polka Dot grouper (Cromileptis altivelis) cultivation, Brown marbled grouper (Ephinephelus fuscoguttatus) culture whereas it is only a sideline activity and only utilize food wastes are left, so the whole will be able to deliver optimal results in grouper culture.All examined aspects of Grouper cultivation in karimunjawa  gave results that investment activity  is able to be executed. The financial analysis shows that investment in grouper fish cultivation in jepara regency is very feasible to be a business investment for the investors.

Struktur Komunitas Zooplankton Di Perairan Desa Mangunharjo Kecamatan Tugu Semarang

BULETIN OSEANOGRAFI MARINA Vol 7, No 2 (2018): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

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Abstract

Perairan Desa Mangunharjo merupakan perairan yang mengalami perubahan kondisi lingkungan akibat abrasi yang berdampak pada kerusakan ekosistem mangrove dan tambak. Kondisi tersebut berpengaruh terhadap keberadaan biota perairan salah satunya adalah zooplankton. Oleh karena itu penelitian ini dilakukan untuk mengetahui struktur komunitas zooplankton di perairan Desa Mangunharjo. Pengambilan sampel dilakukan pada bulan Maret–April 2017 di perairan Desa Mangunharjo, Kecamatan Tugu, Semarang. Metode yang digunakan adalah metode deskriptif eksploratif. Analisis data yang digunakan untuk mendeskripsikan komunitas zooplankton meliputi: kompisisi dan kelimpahan, indeks keanekaragaman, indeks keseragaman dan indeks dominansi. Hasil penelitian menunjukkan bahwa zooplankton yang ditemukan secara keseluruhan sebanyak 23 genera yang terbagi atas 5 fila. Kelimpahan tertinggi sebesar 126.76 ind/L dan terendah 28.17 ind/L. Arthropoda merupakan filum yang paling banyak ditemukan pada penelitian ini. Indeks keanekaragaman yang diperoleh berkisar antara 0.72 – 2.49 dan dikatagorikan keanekargaman rendah dan sedang. Untuk indeks keseragaman yang diperoleh berkisar antara 0.44 – 0.98 dan dikatagorikan keseragaman sedang dan tinggi. Dan untuk indeks dominansi diperoleh nilai berkisar antar 0.02 – 0.98 dan dikatagorikan tidak ada dominasi. Mangunharjo Village waters have changed environmental conditions due to abrasion that damage the mangrove ecosystems and ponds. These conditions affect the presence one of aquatic biota which is zooplankton. Therefore this research is done to know the structure of zooplankton community in Mangunharjo Village waters. Sampling was conducted in March-April 2017 in the waters of Mangunharjo Village, Tugu Sub-district, Semarang. The method used is descriptive explorative method. The data analysis used to describe the zooplankton community includes: composition and abundance, diversity index, uniformity index and dominance index. The results showed that zooplankton found as a whole 23 genera of 5 fila. The highest abundance was 126.76 Ind/L and the lowest was 28.17 Ind/L. Arthropods are the most common phyla in this study. The index of diversity obtained ranges from 0.72 to 2.49 and categorized at low and medium diversity. As for the uniformity index obtained ranged from 0.44 to 0.98 and categorized at medium and high uniformity. And for the dominance index obtained values ranged between 0.02 - 0.98 and categorized at non dominance.