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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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Published by Universitas Diponegoro

ISSN : 08537291 EISSN : 24067598 DOI : -

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Earth & Planetary Sciences

ILMU KELAUTAN: Indonesian Journal of Marine Sciences (IJMS) is dedicated to published highest quality of research papers and review on all aspects of marine biology, marine conservation, marine culture, marine geology and oceanography.

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Struktur Populasi Vegetasi Mangrove di Laguna Segara Anakan Cilacap, Jawa Tengah Chrisna Adi Suryono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 11, No 2 (2006): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Kawasan Segara Anakan mempunyai hutan mangrove yang paling luas di Pulau Jawa. Penelitian ini bertujuan untuk mengetahui struktur populasi dan distribusi mangrove di Segara Anakan Cilacap. Metode yang digunakan dalam penelitian ini adalah metode survey, sedangkan pengambilan sampel dengan menggunakan Point Centered Quarter Method (PCQM). Data yang telah diperoleh dianalisa untuk memperoleh nilai kepadatan relatif, dominansi relatif, frekuensi relatif dan nilai penting. Hasil penelitian menunjukan bahwa struktur populasihutan mangrove Segara Anakan Cilacap masih cukup baik dengan H’=2,427 – 2,076 dan e = 0,686 – 0,902. Jenis mangrove yang didapatkan 10 jenis Avecinia marina, A. alba, Soneratia caseolaris, S. alba, Rhizophora apiculata, R. mucronata, Bruguiera cylindrica, B. gymnorhiza, Aegiceras corniculatum dan Nypa fruticans. Jenis mangrove yang mendominansi adalah Avecinia marina (NP= 58 - 73,5 %) dan Soneratia caseolaris (NP= 62,1 – 69,8 %)Kata kunci: Populasi, Mangrove, Segara Anakan.The mangrove areas in Segara Anakan Cilacap is the widest mangroves in the Java Island, but now that mangrove has been decreased in large. The aims of the research were to understand the population structureand distribution. The Point Centered Quarter Method (PCQM) was used to take data samplers along the tracks. The data was collected analyzed to find relative density, relative dominance, relative frequency andthe important value of each species. The result showed that the population structure at Ujung Alang Segara Anakan Cilacap was still good condition which H’= 1,427 – 2,076, e= 0,686 – 0,902. There were 10 species found : Avecinia marina, A. alba, Soneratia caseolaris, S. alba, Rhizophora apiculata, R. mucronata, Bruguiera cylindrica, B. gymnorhiza, Aegiceras corniculatum and Nypa fruticans. The mangrove dominance was Avecennia marina (IV= 58 - 73,5 %) and Sonneratia caseolaris (IV = 62,1 – 69,8 %).Key words : Population, Mangrove, Segara Anakan

First Record of The Burrowing Goby Trypuchen vagina from Pangpang Bay, Indonesia Sapto Andriyono; Endang Dewi Masithah; Heru Pramono; Suciyono Suciyono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 3 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The burrowing goby, Trypauchen vagina, is recorded for the first time from the Pangpang Bay of Banyuwangi, Indonesia. Types of fish T. vagina is a type that has not published in Indonesia. This fish was caught using trap net in waters Pangpang Bay, which is an essential area in Banyuwangi, East Java. The description of the morphology and fish habitat conditions shows that the region has a diversity of fish resources that need attention. This goby fish has a local name as fish bedhul picek due to the sense of sight on these fish as if it does not work. Eyes covered by skin and socket head section was not found their eyeballs. The body of the specimens is elongate and reddish-pink in fresh specimens in coloration. There is no barbel on the chin. Cycloid scales are present on the whole body except for the head. Muncar people commonly consume T.vagina. This fish has been food sources in several regions but uncommon at several local markets in Indonesia. The T.vagina inhabit at Pangpang Bay as the bay, which has the high primary productivity of these waters due to sufficient nutrient support. Enrichment of nutrient comes from the run-off land and also the input of the number of fishing activity (embankment). An earlier report said that this fish found in waters Banyu Asin, Palembang, Sumatra, Indonesia. It also confirms that the fish found in this study are also living in a mud substrate that is reasonably smooth with right mangrove conditions around the bay, which close to Alas Purwo National Park.

Kandungan Lipid Total Nannochloropsis oculata Pada Kultur dengan Berbagai Fotoperiod (Total Lipid Content of Culture of Nannochloropsis oculata at Different Photoperiod) Widianingsih Widianingsih; Retno Hartati; Endrawati Hadi; Valentina R Iriani
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 3 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Fotoperiod memainkan peranan penting dalam proses fotosintesis pada mikroalga Nannochloropsis oculata. Fotoperiod akan mempengaruhi kadar total lipid pada berbagai jenis mikroalga. Penelitian ini bertujuan untuk determinasi kandungan lipid total mikroalga Nannochloropsis oculata yang dikultur pada berbagai kondisi fotoperiod Rancangan acak lengkap dengan tiga ulangan diterapkan pada penelitian ini. Perlakuan pada penelitian ini adalah fotoperiod 4 jam terang-20 jam gelap, 8 jam terang-16 jam gelap, 12 jam terang-12 jam gelap, dan 24 jam terang. N. oculata dikultur pada erlenmeyer 250 mL dengan sistem aerasi kontinyu dan pencahayaan 3000 lux, salinitas 33 ppt dan medium Conway. Hasil penelitian menunjukkan bahwa kandungan lipid total pada N. oculata tertinggi ditemukan pada perlakuan fotoperiod 12 jam terang-12 jam gelap) (31,8±3,03%-dw) dan kemudian diikuti pada fotoperiod 8jam terang - 16 jam gelap (25,2±2,19%-dw) dan fotoperiod 24 jam terang (23,2 %-dw). Pada perlakuan fotoperiod 8 jam terang-16 jam gelap dan fotoperiod 12 jam terang-12 jam gelap pada media pemeliharaan N.oculata menunjukkan hasil kadar lipid total yang lebih besar pada fase stasioner dibandingkan dengan eksponensial.Kata kunci: Nannochloropsis oculata, total lipid, fotoperiodPhotoperiod has important role on the photosynthesis process of microalgae Nannochloropsis oculata. Photoperiod also influences on total lipid content of various microalgae. This research has purpose to examine the effect of nutrient phosphate and nitrate composition to the total lipid content of N. oculata belong to class Eustigmatophyceae. There were four treatments of photoperiod as follows; (a) photoperiod A (4:20 hour light:dark);(b) photoperiod B (8:16 hour light:dark); photoperiod C (12:12 hour light:dark); (and (d) photoperiod D (24 hour light). There were three replicates for each treatment. The volume of culture medium was 250 mL for each treatment with continuously aeration and illumination (3000 lux). According to the research, the highest total lipid content of N. oculata had been found on the treatment of photoperiod 12:12 hour light:dark 31,8 ± 3,03 %-dw, and then followed by photoperiod 8:16 hour light dark as amount 25,2 ± 2,19 %-dw and 24 hour light (23,2 ± 1,99%-dw), and then followed by photoperiod 24 hour light. Differences of photoperiod 8:16 hour light:dark and photoperiod 12:12 hour light:dark on culture medium of N. oculata showed result that there were differences of total lipid content on the stationary and exponential phase. The highest percentage of total lipid was fund in cell of N. oculata grown under treatment of photoperiod 12:12 hour light:dark. The treatment of photoperiod 8:16 hour light:dark and 12:12 hour light:dark in the N. oculata culture showed result that the total lipid content on stationary phase was greater than exponential phase.Key words: Nannochloropsis oculata, total lipid, photoperiod

Gejala Intrusi Air Laut di Daerah Pantai Kota Pekalongan Sugeng Widada
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 1 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Sebagian wilayah pantai Kota Pekalongan dijumpai adanya air tanah payau yang pelamparannya semakin luas. Tujuan penelitian ini adalah untuk memetakan sebaran air tanah payau tersebut, baik pada akuifer dangkal maupun akuifer dalam dan juga untuk mengetahui penyebab keasinan air tanah tersebut. Sebaran air tanah asin dipetal<an berdasarkan nilai daya hantar listrik (DHL) dengan kriteria tingkat keasinan sebagaimana ditetapkan oleh Panitia Ad Hoc Intrusi Air Asin Jakarta. Sedangkan penyebab keasinan air tanah dianalisa berdasarkan fasies hidrokimia dengan diangram Trilinier Piper. Hasil penelitian menunjukan bahwa pada akuifer dangkal air tanah agak payau dengan DHL 1500 \iS/cm - 2.200 uS/cm dijumpai di sebelah utara, meliputi Desa Bandengan, Kandang Panjang, Panjang Wetan, Krapyak Lor, dan sebagian Degayu. Sedangkan untuk airtanah dalam seluruhnya dalam kondisi tawar dengan nilai DHL < 1500 uS/cm, kecuali sumur di Pantai Sari tergolong agak payau dengan DHL 1.602 jjS/cm. Keasinan air tanah pada akuifer dangkal disebabkan oleh proses intrusi air laut, kecuali air tanah di Kauman merupakan air fosil (connate water). Untuk akifer dalam juga tampak mulai muncul tanda-tanda intrusi air laut terutama pada wilayah bagian barat dan tengah, sedangkan di wilayah timur belum tampak adanya gejala intrusi air lautKata kunci: Daya hantar listrik, Intrusi air laut, akuiferIn the part of Pekalongan coastal region was found brackish groundwater which spreading progressively. Theaim of this research was to map the brackish groundwater, either at the shallow or deep aquifer and also toknow cause of the ground water saltiness. Briny groundwater spread was mapped based on the value ofelectric conductivity (EC) with saltiness criterion as specified by Panitia Ad Hoc Intrusi Air Asin Jakarta. Causeof saltiness of ground water was analysed base on the hydrochemical facies by Trilinier Piper diangram. Theresult of the work showed that the rather brackish groundwater at shallow aquifer which indicated by ECvalue 1500 μ S/Cm - 2.200 μ S/Cm found in the northside, covering Bandengan, Kandang Panjang, PanjangWetan, Krapyak Lor, and some of Degayu. While all of the groundwater at deep aquifer was as fresh waterwith EC value < 1500 μ S/Cm, except water at deep well in Pantai Sari categorized as rather brackish withEC 1.602 μ S/Cm. Saltiness of groundwater at shallow aquifer was cause by sea water intrusion process,except groundwater at Kauman village represent as connate water. Groundwater at deep aquifer was seenearly sea water intrusion, especially at west and middle part of researh area, while at east of area not yetseen esxistence of sea water intrusion.Key words : Electric conductivity, sea water intrusion, aquifer.

Variation of Tidal Range Based On Hijra Calendar And Its Relation With Ethno-Oceanography of The Sama Tribe In Eastern Indonesia Salnuddin Salnuddin; I Wayan Nurjaya; Indra Jaya; Nyoman M.N Natih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 2 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Based on Ethno–Oceanography of the Sama tribe in Eastern Indonesia, they measured and determined tidal range when Sya’ban taking place. Why do they do so? The questions and objective of this study were intended to respond the scientific fundamental of Ethno-Oceanography of the Sama tribe. In order to achieve the objective of this study, the tidal range value in each Hijra month was compared and analyzed statistically (ANOVA). Tidal Analysis results showed that the tidal range at Sya’ban was higher and the deviation was lower than the other months. Moreover, ANOVA results showed that Sya’ban was significantly different (P<0.05) on Highest High Water Level (HHWL) throughout Hijra month. Keywords: Sama Tribe, Sya’ban, Hijra Calendar

Co-existence in Small-pelagic Fish Resources of The South Coast of East Java, Straits of Bali, Alas and Sape - Indonesia Abdul Ghofar
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 3 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Perikanan pelagik kecil dari empat ekosistem di Indonesia diperbandingkan, meliputi perairan pantai di sebelah selatan Jawa Timur, Selat Bali, Selat Alas dan Selat Sape. Pengkajian dimaksudkan untuk menentukan adatidaknya, dan kalau ada –bagaimana sifatnya, interaksi antar jenis-jenis ikan utama, dan antar ke empat perairan tersebut, sehingga dapat dimanfaatkan dalam mempertimbangkan pengembangan riset dan pengelolaan sumberdaya hayati laut pada masa-masa mendatang. Pengkajian ini menggunakan data tangkapan ikan dengan rentang-waktu 28 tahun, mulai 1976 sampai 2003, yang dikumpulkan dari pusat-pusat pendaratan ikan dan Dinas-dinas Kelautan dan Perikanan tingkat I dan Tingkat II di wilayah studi. Hasil pengkajian menunjukkan dengan jelas adanya ko-eksistensi antar sumberdaya ikan pelagis kecil di ke empat wilayah perairan. Interaksi kelompok jenis antar ke empat ekosistem, serta implikasinya terhadap riset kelautan dan perikanan dibahas pula dalam tulisan ini.Kata kunci: ikan pelagik kecil, indeks osilasi selatan, aliran-deras Indonesia, upwellingSmall pelagic fisheries of four ecosystems in Indonesia are compared, covering the south coast of East Java, Bali Strait, Alas Strait and Sape Strait, to explore potential interactions between major species, and ofdifferent localities, of small pelagic components caught, which may then be taken into fisheries research and management considerations. A 28-years catch data time series used for analysis were taken from major fishing harbours, landing places and fisheries offices, and go back as far as 1976-2003. There is a clear co-existence in the overall small pelagic resources within the areas studied. Interactions of the species group between ecosystems and their substantial implication in marine and fisheries research are also discussed in this paper.Key words: small pelagics, southern oscillation index, Indonesian through-flow, upwelling

Aplikasi Ekstrak Rumput Laut Sebagai Agen Imunostimulan Sistem Pertahanan Non Spesifik Pada Udang (Litopennaeus vannamei) Ali Ridlo; Rini Pramesti
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 3 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini bertujuan untuk menganalisis potensi ekstrak dari rumput laut Dictyota sp., Gracilaria sp., Padina sp., dan Sargassum sp. sebagai imunostimulan sistem pertahanan tubuh non spesifik udang L. vannamei. Rumput laut diekstraksi dengan cara direbus dalam air mendidih selama 2 jam. Suplementasi ekstrak pada pakan udang buatan diberikan dengan dosis 10 g/kg pakan. Hasil penelitian menunjukkan adanya peningkatan jumlah hemosit dan aktivitas fagositosis udang L. vannamei akibat pemberian ekstrak rumput laut dibandingkan kontrol. Peningkatan tersebut terlihat pada jumlah hemosit udang L. vannamei yang diberi ekstrak Gracilaria sp. pada hari ke-8 , Dictyota sp. dan Sargassum sp pada hari ke 12, sedangkan peningkatan aktifitas fagositosis terjadi pada perlakuan dengan ekstrak Dictyota sp., Gracilaria sp. dan Sargassum sp. pada hari ke-8. Pemberian ekstrak Sargassum sp memberikan hasil terbaik yaitu untuk jumlah hemosit 1,127±0,260 pada hari ke-12 dan aktifitas fagositosis 214,061±15,955 pada hari ke- 8. Kata kunci : Imunostimulan, rumput laut, L. vannamei Study on application of seaweed Dictyota sp., Gracilaria sp., Padina sp. and Sargassum sp. extract as imunostimulant agent for non-specific defense system of white shrimp (L. vannamei) was conducted. Air - dried seaweed was extracted by boiling in water for 2 hours then fortified into shrimp feed pellet with concentration of 10g/kg pellet. Haematological parameters of Total Haemocyte Count (THC) and Phagocytosist Activity (PA) was then tested at 4, 8, 12 days period after initial treatment. The result showed that fortification of seaweed extract was increased the number of haemocyte was clearly shown at day 8 of Gracilaria sp. extract treatment and day 12 of Dictyota sp. and Sargassum sp. treatment. Meanwhile phagocytosist activity was clearly increased at day 8 of Dictyota sp., Gracilaria sp. and Sargassum sp treatment. Extract of Sargassum sp. gave the most significant effect with total haemocyte of 1,127 ± 0,260 at day 12th and phagocytosist activity of 214,061± 15,955 at day 8th. Key words : Immunostimulant, seaweed, L. vannamei

Contribution of Terrestrial Runoff to Coral Disease Prevalence on North Bali’s Massive Porites I Gusti Bagus Siladharma; Widiastuti Karim
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 4 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The widespread of coral disease may threatened Bali`s marine tourism which is the main asset for the nation prosperity. However, the disease prevalence is still unknown, in particular inshore coral reefs near to tourist spot areas. Therefore, the research aims to investigate the contribution of terrestrial runoff to coral disease prevalence and to examine the relationships between disease prevalence and environmental parameters (nitrate, phosphate, organic carbon and total suspended solids (TSS)) within the population of massive Porites on shallow north Bali reefs. Syndrome, diseases and healthy colonies of massive Porites coral were counted and noted within a 2 x 10 m belt transect at 3 sampling sites. The dominant disease observed was ulcerative white spots (UWS), while the syndromes were pigmentation response and aggressive overgrowth by macroalgae. The highest mean UWS prevalence was at site 3 which was the closest site to runoff (prevalence = 91%).This disease only affected one colony at site 1 and 2, respectively. Disease prevalence had strong relationship with TSS and nitrate, yet it showed weak relationship with phosphate and organic carbon. These results suggest that terrestrial runoff could contribute to the disease prevalence by increasing the TSS, nutrients and organic carbon loading to the inshore ecosystems. High level of organic carbon could severe the disease, particularly when combined with elevated TSS and nutrient, by reducing the coral`s immunity system. Keywords: coral disease, prevalence, terrestrial runoff, Porites, ulcerative white spot, environmental parameter, North Bali.

Hubungan Ketajaman Penglihatan dan Jarak Pandang Maksimum Penglihatan Pada Ikan Kerapu Lumpur (Ephinephelus tauvina) Aristi Dian Purnama Fitri
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 10, No 1 (2005): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian ini dilakukan untuk mengetahui hubungan antara ketajaman penglihatan dan jarak pandangpenglihatan pada ikan kerapu lumpur (Greasy grouper). Sejumlah lima belas ekor ikan kerapu lumpur dengan ukuran panjang total tubuh 140-350 mm TL dianalisis menggunakan prosedur histologi retina mata untuk mendapatkan jumlah kepadatan sel kon tertinggi sebagai dasar penentuan ketajaman penglihatan dan jarak pandang penglihatannya. Nilai kepadatan sel kon tertinggi adalah 404 sel/0,01 mm2 untuk ukuran panjang tubuh 110 mm BL dan 256 sel/0,01 mm2 untuk ukuran panjang tubuh 280 mm BL. Sedangkan nilai ketajaman penglihatan untuk ikan kerapu lumpur berturut-turut adalah 0,089 untuk ukuran panjang tubuh 110 mm BL dan 0,149 untuk panjang tubuh 280 mm BL. Dengan dasar ketajaman penglihatan yang dimiliki, maka diketahui pula jarak pandang maksimum penglihatan sejauh 1,8452 m untuk ukuran panjang tubuh 110 mm BL dan 3,0845 m untuk ukuran tubuh 280 mm BL.Kata kunci: Ikan kerapu lumpur (Epinephelus tauvina), Panjang tubuh, Kepadatan sel kon, Ketajamanpenglihatan, Jarak pandang maksimum.Objective of the study is to investigate relation between visual acuity and maximum sighting distance of Ephinephelus tauvina. Fifteen Ephinephelus tauvina of 140-350 mm total length TL was analyzed by usinghistological examination of their retinas to obtain highest density of cone cells as based on visual acuity and maximum sighting distance.The maximum cone densities were 404 cells/0.01 mm2 for the fish of 110 mm body length BL and 256 cells/0.01 mm2 for the fish of 280 mm body length BL. The visual acuity for each specimens, were 0.09 for fish with 110 mm body length BL and 0.149 for fish with 280 mm body length BL. Visual acuty as determine maximum sighting distance were 1.8452 m for 110 mm body length BL and 3.0845 m for 280 mm body length BL.Key words: Ephinephelus tauvina, Body length, Cells cone density, Visual acuity, Maximum SightingDistance.

Impact Test Size and Type of Echinometra mathaei as Agent of Bioerosion on Reef Flat (Pengaruh Ukuran dan Tipe Echinometra mathaei pada Bioerosi Karang) Cristiana Manullang; Makoto Tsuchiya; Ambariyanto Ambariyanto; Diah Permata
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 2 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Bioerosi adalah aktivitas berbagai organisme yang menyebabkan terjadinya erosi dan kerusakan misalnya pada kalsium karbonat karang. Aktivitas ini merupakan faktor utama yang mempengaruhi morfologi terumbu karang. Bioerosi dipengaruhi oleh tiga variabel yakni jenis spesies, ukuran dan kelimpahan spesies tersebut. Tujuh puluh lima persen dari bioerosi disebabkan oleh landak laut. Perbedaan pada ukuran dan jenis landak laut memberikan dampak signifikan terhadap daerah yang terjadi bioerosi. Penelitian ini bertujuan untuk menguji pengaruh ukuran dan jenis landak laut E. mathaei (tipe A dan B) pada komposisi CaCO3 dalam isi usus dan tinja organisme tersebut sebagai agen bioersi. Landak laut yang digunakan diperoleh dari ekosistem karang di pantai Minatogawa, Okinawa-Jepang. Masing-masing tipe landak laut dibedakan berdasarkan ukuran ≥30 mm dan <30mm. Penelitian dilakukan dengan tiga ulangan. Pemeliharaan ini dilakukan di laboratorium dengan analisis komposisi CaCO3 pada tinja dan konten usus. Hasil penelitian membuktikan bahwa komposisi CaCO3 disebabkan karena aktivitas bioerosi harian dari E. mathaei. Landak laut dengan ukuran diameter ≥30 mm terbukti lebih aktif dibandingkan dengan diameter <30mm. Disamping itu landak laut tipe B lebih aktif dibandingkan tipe A dengan ukuran yang sama. Persentase CaCO3 dalam usus selama pemeliharaan di laboratorium adalah 73% dan sisa 27% berupa bahan organik dan anorganik. Bierosion harian E. mathaei tipe A ≥ 30 mm 166,70 mg.hari-1, tipe A <30 mm 77.78 mg.hari-1, tipe B ≥ 30 mm 126,30 mg.hari-1, tipe B <30 mm 116,17 mg.hari-1. Tingkat bioerosion harian E. mathaei dipengaruhi oleh jenis, spesies, kecepatan menggiling, dan ukuran landak laut. Kata kunci: ukuran; Echinometra mathaei; bioerosi; karang Bioerosion is an activity of various organisms such as erosion and destruction of coral calcium carbonate and become a major factor influencing coral reefs morphology. Bioerosion is influenced by three variables: type of species, size of species and abundance. Seventyfive percent of bioerosion caused by sea urchin. Differences on size and type of sea urchin gave a significant impact to the bioerosion area. This study aimed to examine the influence of the size and the type of sea urchin E. mathaei (type A and type B) on the composition of CaCO3 in the gut content and feces as bioersion agent on the reef flat in Minatogawa Coast, Okinawa-Japan. The organisms used were E. mathaei type A and type B with each type distinguished by size ≥ 30 mm and < 30 mm with three replications. The maintenance was carried out at laboratory for 3 days by observing analysis of the composition of CaCO3 on feces and gut content. It indicates that the composition of CaCO3 as daily bioerosion was caused by E. mathaei. The results showed E. mathaei with diameter ≥ 30 mm was more active than those with diameter of < 30mm and type B was more active than type A in each of the same size. Percentage of CaCO3 in the gut during maintenance in the laboratory was 73% and the other 27% consist of organic and inorganic materials. Daily bierosion E. mathaei type A ≥ 30 mm 166.70 mg.day-1 , type A < 30 mm 77.78 mg.day-1 , type B ≥ 30 mm 126.30 mg.day-1 , type B < 30 mm 116.17 mg.day-1. Daily bioerosion rate E. mathaei was influenced by the type, species, speed of grind, and the size of the sea urchin. Keywords: size; Echinometra mathaei; bioerosion; reef flat

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