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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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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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Growth, Mortality, and Exploitation Rate of Penaeus merguensis in the North Coast of Central Java, Indonesia Suradi Wijaya Saputra; Anhar Solichin; Wiwiet Teguh Taufani
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 4 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

One of the most-caught shrimp in north coast of Central Java is Penaeus merguiensis. However, little is known on the population biology of the organisms. This study was aimed to investigate length-weight relationship, growth, length at first capture (Lc50), mortality rate, and exploitation rate of P. merguiensis in Western part of Central Java’s northern coastal waters. The study was conducted from May 2016 to July 2017 using survey method. Samples were taken for 15 times (month) from 9 coastal fishing ports. The result shows that the relationship of the carapace length and weight is negative allometry. The growth parameters of CL∞ and K were 52.5mm and 1.3 y-1 (male) and 57.25mm and 1.2 y-1 (female). Total mortality rate (Z), natural mortality rate (M), and fishing mortality rate (F) were 4.51 y-1, 1.86 y-1 and 2.65 y-1 (male), and 5.36 y-1, 1.72 y-1, and 3.64 y-1 (female), respectively. The exploitation rate (E) of male banana shrimp was 0.59, and for female shrimp was 0.68. The result shows that the exploitation level has exceeded the optimum level (E>0.5). Recruitment of P. merguiensis may occur the whole year, but it peaks were in March and August (male), April and August (female). Carapace length of first captured (CLc50) was 20.63mm (male) and 18.28mm (female). It means that the sized of captured P. merguiensis is less than the size of first mature (CLm50) or growth overfishing and as a result, disrupting the availability of adult shrimp. The condition occurs due to the size of cod-end mesh measured 0.75inc.

Evaluasi Perubahan Penggunaan Lahan Pesisir Kabupaten Kendal Tahun 1997-2001 dengan Menggunakan Data Citra Landsat-TM Petrus Subardjo
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 2 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Wilayah Kabupaten Kendal dengan kawasan pesisir yang luas dalam pembangunan di kawasan pesisir perlu di awasi. Pengawasan tersebut termasuk melakukan evaluasi luas dan penggunaan lahan yang ada apakah sesuai dengan perencanaan yang telah ditetapkan. Untuk melakukan evaluasi penggunaan lahan diperlukan data yang cepat, teliti, kontinyu, terbaru, dapat di percaya dan dipertanggungjawabkan, data tersebut dapat dipenuhi dengan menganalisa data citra Landsat-TM. Pada penelitian ini evaluasi penggunaan lahan pesisir dilakukan terhadap citra Landsat-TM path/row 120/064 tertanggal 15 Agustus 1997 dan citra Landsat-ETM+7 path/row 128/065 tertanggal 5 Desember 2001, juga berdasarkan Peta Rencana Umum Tata Ruang Kawasan Pesisir Kabupaten Kendal tahun 1992/1993 – 2012/2013 terbitan BPN Kendal. Pada penelitian ini diketahui penggunaan lahan di kawasan pesisir Kabupaten Kendal pada tahun 1997 dan tahun 2001 didominasi oleh kawasan pertanian, diikuti pemukiman, tambak, tegalan, perkebunan dan industri. Penggunaan lahan tambak bertambah ± 1210,86 ha lalu pemukiman bertambah ± 2153,88 ha, lahan industri bertambah ± 48,33 ha,lahan sawah berkurang ± 2662,56 ha lalu tegalan berkurang ± 644,13 ha dan lahan perkebunan berkurang ± 106,46 ha.Kata kunci : penggunaan lahan, kawasan pesisir, citra Landsat-TMKendal government has to control its coastal development progress. The control system was evaluation space and distribution of land, whether is suit with the plan or not. The evaluation needed were oford, punctual,continue, newest, trusted and responsible data. Then the Landsat-TM image data that had been used to identification the actual land use, was using for next analysis. The evaluation of coastland use had been doneby analyzing the Landsat-TM image path/row 120/064 on August 15th 1997 and Landsat – ETM +7 image path/row 120/065 on December 15th 2001, aimed at Rencana Umum Tata Ruang Kawasan Pesisir KabupatenKandal map 1992/1993 – 2012/2013, published by Badan Pertahanan Kendal. From the research, has been know that the Kendal coastal land use from 1997 and 2001 dominated by farming, settlement, brackish,anable upland, estates and industry. The usage of brackish area increase ± 121,086 ha, settlement area increase ± 2153,88 ha, industrial area increase ± 48,33 ha, paddy field area decrease ± 2662,56 ha, anableupland area decrease ± 644,13 ha and estates area decrease ± 106,46 ha.Key words : land use, coastal area, Landsat-TM image

Model Numerik Dua Dimensi Transpor Logam Berat di Perairan Pantai Tanjung Gerem Cilegon Dian Noor Handiani; Nining Sari Ningsih; Harum Sukarmadijaya
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 13, No 2 (2008): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Pemodelan matematik transpor 2 dimensi (2D) telah digunakan untuk mempelajari penyebaran logam berat Cobalt (Co) di perairan Pantai Tanjung Gerem, Cilegon. Hasil model transpor menunjukkan arah penyebaran cobalt dipengaruhi oleh pola sirkulasi arus dan besarnya debit konsentrasi cobaltyang masuk ke perairan. Hasil model menunjukkan, penyebaran cobalt pada kondisi pasut purnama dan perbani saat air pasang menuju surut cenderung menyebar ke arah utara dan saat air surut menuju pasang cenderung menyebar ke arah selatan dari sumber. Kisaran konsentrasi cobalt pada kondisi pasut purnama 0,072 - 0,074 mg/l dan pasut perbani sekitar 0,127 - 0,129 mg/l. Berdasarkan hasil pengukuran lapangan dan simulasi model, diketahui konsentrasi cobalt di perairan Tanjung Gerem sudah memiliki nilai diatas kondisi perairan alamiKata kunci: Cobalt, Model Transpor

Modelling the Diel Vertical Movement of Swordfish (Xiphias gladius Linnaeus, 1758) Based on Temperature and Depth Recorder Data Bram Setyadji; Hety Hartaty
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 1 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Understanding the vertical distribution of large pelagic fish, swordfish in particular, could improve our knowledge on its fisheries strategy, management and resource conservation. However the methods often require expensive tools and resources, which probably most scientists from the development countries couldn’t afford. Thus developing model on the diel vertical movement behavior of swordfish using number of hook between float (HBF) and complete-set temperature and depth recorder (TDR) data could be an alternative. In general context, capture depth distributions are a good indicator of the natural depth distribution of the fish if the entire depth range of the species is targeted by longline gear. The proposed sinusoidal model suggested that swordfish showed a diel pattern in depth distribution, marked by remained in the surface and mixed layer waters at night and dived into deeper waters during the day. Keywords: swordfish, behavior, HBF, TDR, sinusoidal model

Peranan Vegetasi Batata Pantai (Ipomoea pes-caprae) dalam Mereduksi Erosi Gisik di Sepanjang Pantai Teluk Amurang, Sulawesi Utara Effendi P Sitanggang
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 2 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Gisik pantai Sulawesi Utara riskan terkena erosi karena aktivitas manusia dan lau serta kurangnya tanaman pelindung pantai. Ipomoea pes-caprae, dengan nama lokal 'batata pantai', merupakan salah satu spesies tumbuhan yang umumnya tumbuh di sekitar garis pantai. Penelitian ini untuk mengetahui peranan batata pantai dalam mereduksi erosi gisik melalui kajian substratnya. Lima stasiun di sepanjang hamparan gisik Teluk Amurang dipilih sebagai lokasi penelitian. Data dikumpulkan dengan menggunakan metode deskriptif dan metode transek. Transek ukuran. 50 x 50 cm yang dibagi dalam 25 bagian (100%) ukuran 10 x 10 cm digunakan untuk menentukan persen tutupan vegetasi. Sepuluh persen tutupan (selang 10%) digunakan pada lokasi-lokasi bervegetasi batata pantai dan 0% untuk lokasi yang tidak bervegetasi. Contoh sedimen seberat 100 sampai 150g diambil dari setiap persen tutupan, kemudian diayak dengan ayakan AFNOR untuk mendapatkan berat dari setiap kelompok butiran sedimen, lalu mengkonversikannya ke skala Wentworthuntuk mendapatkan nilai rataan empirik, penyortiran, kemencengan, dan peruncingan. Kehadiran batata pantaidapat mereduksi erosi gisik, dengan mengikat sekitar 31% pasir sedang dan halus, serta mengikat pasir sangat halus dan debu dua kali lebih besar dibandingkan gisik tanpa kehadiran vegetasi tersebut.Kata kunci: batata pantai (Ipomoea pes-caprae), gisik, erosi, sedimen, Teluk Amurang

Biological Parameters of Blacksaddled Coralgrouper (Plectropomus laevis Lacepède, 1801) Eggs and Larvae Regina Melianawati; Bejo Slamet
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 4 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Blacksaddled coralgrouper, Plectropomus laevis, is an endangered species of marine fish. As part of conserving their existence in the wild, culture of this species has been started. However, knowledge of biological parameters of this species as important indicators to observe the fish growth in mariculture scale, is limited. The purpose of this study was to observe biological parameters during eggs, larval to juvenile stage of blacksaddled coralgrouper in mariculture hatchery. The eggs were obtained from natural spawning of domesticated broodstocks. Larvae rearing was done in hatchery at three different times as replicates. Larval were fed with zooplankton which consist of rotifers Brachionus sp., wild copepods and Artemia. Artificial feed was also given to the fish larvae. Larval samples were taken one Day After Hatching (DAH), then continued every 5 days started at 5 to 45 DAH by using five larvae each sampling time. The observed parameters were diameter of eggs and oil globule, total length and standard length of larvae length of dorsal and pelvic fin spines of larvae. Furthermore, growth pattern of those length parameters was analysed by regression equation. The result showed that diameter of blacksaddled coralgrouper eggs was 835.19±15.29 µm, while oil globule was 177.78±10.30 µm. The growth patterns of larval total length and standard length were exponential, while dorsal and pelvic fin spines were polynomial. The length of time from larvae to achieve juvenile stage was range between 45-50 days. All of these information can be used as references either in larvae rearing or for further study of the fish.

Status Rekruitmen Karang Scleractinia di Perairan Kendari Sulawesi Tenggara (Recruitment Status of Coral Scleractinian In Kendari Waters Southeast Sulawesi) Ratna Diyah Palupi; Ricoh Managor Siringoringo; Tri Aryono Hadi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 3 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Proses rekruitmen karang dapat dilihat berdasarkan jumlah juvenil karang yang dapat hidup di suatu ekosistem perairan. Kesuksesan planula melakukan penempelan pada substrat dan akhirnya dapat berkembang menjadi juvenil karang merupakan indikator kesuksesan biota karang untuk kelangsungan hidup keturunannya. Tujuan penelitian rekruitmen karang di Perairan Kendari adalah untuk menginformasikan status juvenil karang di lokasi penelitian. Hasil penelitian menunjukkan bahwa kelimpahan juvenil karang tertinggi terdapat pada stasiun penelitian Tukalanggara (gosong) dan Pulau Bahulu (7.7 dan 8.6 rekruit/m2), sedangkan ketiga stasiun penelitian lainnya (Teluk Wawobatu, Tukalanggara daerah tanjung, dan Pulau Labengke) menunjukkan hasil kelimpahan juvenil yang lebih rendah, yaitu beturut-turut 4.0; 3.9; dan 3.3 rekruit/m2. Ukuran juvenil karang dengan tingkat kelulushidupan tertinggi dicapai pada saat juvenil berukuran 2-4.9 cm. Karakteristik habitat lokasi penelitian yang berbeda dan kondisi bentik terumbu merupakan faktor utama kesusksesan karang muda untuk dapat tumbuh.Kata kunci: juvenil, perairan Kendari, rekruitmen karang, kelimpahanProcess of coral recruitment can be assessed base on the number of existing juvenile corals in an aquatic ecosystem. The success of planula attachment on the substrate and may eventually develop into juvenile coral is an indicator of coral reefs to continue there generation. Objectives of the study were to inform the status of coral recruitment at the research site. Results showed that the higher abundance of juvenile corals found in Tukalanggara (gosong) and Bahulu Island (7.7 and 8.6 rekruit/m2) than those in other locations (Gulf Wawobatu, Tukalanggara cape area, and Labengke island). Range size of coral juvenile with the highest survival rate is at 2-4.9 cm length. Characteristics of research sites and condition of benthic substrattum is the main factor upon the success juvenile corals to grow.Key words: juvenile, Kendari waters, recruitment of coral, abundance

Komposisi Isi Saluran Pencernaan Ikan Teri (Stolephorus spp.) di Perairan Barru, Selat Makassar Domu Simbolon; M. Fedi A. Sondita; Amiruddin Amiruddin
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 1 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Ketersediaan sumber makanan di suatu perairan memungkinkan terjadinya interaksi pemangsaan antar ikan. Untuk memastikan dugaan ini, perlu dilakukan analisis saluran pencernaan, dan analisis korelasi antara mangsa dengan ikan predator. Penelitian ini bertujuan untuk mengetahui interaksi pemangsaan melalui identikasi jenis dan jumlah makanan dalam saluran pencernaan ikan teri, dan menentukan korelasi antara mangsa dengan ikan predator yang terdapat di lokasi penelitian. Metode penelitian yang digunakan adalah survei melalui kegiatan experimental shing dengan bagan. Data penelitian dikumpulkan dari bulan Mei-Juli 2005 pada 8 lokasi di perairan Barru, Selat Makassar. Terjadi interkasi pemangsaan antara teri dengan plankton, dan antara teri dengan ikan-ikan predator di sekitar sumber cahaya. Komposisi jumlah zooplankton dalam saluran pencernaan teri adalah 94% dan toplankton 6%. Jenis plankton yang ditemukan dalam saluran pencernaan teri meliputi copepoda (50%) dan malacostraca (27%), telur/larva (9%), nauplius (5%), diatom (4%), dan plankton lain 5%. Terdapat korelasi positif antara jumlah zooplankton dalam saluran pencernaan teri dengan kelimpahan zooplankton di perairan, namun tidak berkorelasi pada toplankton. Korelasi positif terjadi juga antara jumlah tangkapan teri dengan kelimpahan zooplankton di perairan. Ikan teri merupakan komponen makanan yang utama dalam saluran pencernaan ikan selar dan peperek. Kata kunci : pemangsaan, pencernaan, plankton, teri, perairan Barru Availability of preys in the waters maybe create predation interaction among fishes. Hence, it is important to analyze the stomach content of fishes, and relationship between prey and predator fishes. The objectives of this research were to know the predation interaction through the identification of kind and amount of food on anchovy’s stomach, and to determine the relationship between prey and predator fishes which found around of research location. Method that used on this research was survey through experimental fishing with liftnet (bagan). Data of research were collected from May - July 2005 at 8 locations in Barru waters of Makassar Strait. There were some predation interaction between plankton and anchovy, and between anchovy and predator fishes around the source of light. The amount composition of zooplankton and phytoplankton in the digestive system (stomach) of anchovy were 94% and 6%. The kind of plankton that found in the digestive system of anchovy were copepod (50%), malacostraca (27%), egg/larvae of fish (9%), nauplius (5%), diatome (4%), and others plankton (5%). There was significant correlation between the amount of zooplankton in anchovy’s stomach and abundance of zooplankton in the waters, but there was not significant for phytoplankton. Significant correlation also accured between the number of anchovy catches and abundance of zooplanktons in the waters. Anchovy was the main food components on stomach content of yellowstripe trevally, and balck tipped ponyfish. Keywords : predation, digestive, plankton, anchovy, Barru Waters

Pathogenic Assay of Probiotic Bacteria Producing Proteolytic Enzymes as Bioremediation Bacteria Against Vannamei Shrimp Larvae (Litopenaeus vannamei) Wilis Ari Setyati; Muhammad Zainuddin; Person Pesona Renta
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 2 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Application of bacteria in bioremediation of shrimp culture ponds is one of the methods used to clean internal pollutants. This study aimed to evaluate the pathogenicity of extracellular proteolytic enzyme produced by the probiotic bacteria as bioremediation bacteria on vannamei shrimp larvae culture. There were five probiotic bacteria, which were successfully isolated from the sediments served as substrate in mangrove area. The isolated bacteria were coded in number as 13, 19, 30, 33, and 36. Pathogenic bacteria Vibrio harveyi was used as positive control. Pathogenic assay was carried out in two different bacterial concentrations, i.e. 10⁸ and 10⁶ cells.mL-1. The results showed that the lowest survival rate (SR) of shrimp larvae in positive control V. harveyi was 53 and 65%. Whereas isolates with the highest SR value (100%) were obtained from bacteria coded as 13 and 30. Isolates no. 19, 33 and 36 had SR of more than 90%. Total plate count (TPC) data showed that the bacteria increased significantly at the end of the study with an average increase value of 24%. The smallest TPC value was shown by bacterial isolate no. 19, while the largest was obtained from the isolate no. 13. These results suggest that all probiotic bacteria were not pathogenic to the vannamei shrimp larvae. Keywords: aquaculture, shrimp, bioremediation, pathogenesis, vibrio.

Fauna Echinodermata di Indonoor Wreck, Pulau Kemujan, Kepulauan Karimunjawa Abdul Hadi; Retno Hartati; Widianingsih Widianingsih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 16, No 4 (2011): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Indonoor adalah sebuah kapal yang karam di tubir Pulau Kemujan, Kepulauan Karimunjawa tahun 1960. Sering berjalannya waktu, dinding bangkai kapal Indonoor ditumbuhi oleh berbagai macam terumbu karang. Hal ini menjadikan lokasi bangkai kapal Indonoor membentuk suatu ekosistem terumbu karang yang memiliki potensi besar dalam bidang pariwisata dan perikanan dan sekarang merupakan salah satu dive point penting di Karimunjawa. Dengan adanya terumbu karang yang hidup pada dinding dan badan kapal yang terbuat dari besi, memungkinkan adanya berbagai jenis biota yang berasosiasi dengan terumbu karang di bagkai kapal tersebut, salah satunya adalah Echinodermata. Penelitian ini bertujuan untuk mengetahui keragaman jenis fauna echinodermata pada di bangkai kapal Indonoor. Pengamatan fauna echinodermnata dilakukan dengan penyelaman dan pengamatan pada 4 bagian patahan bangkai kapal 2005 dan September 2006 menggunakan metoda sensus dengan modifikasi line transect dan kuadrat transect. Hasil penelitian menunjukkan terdapat 12 spesies dari 4 kelas Echinodermata pada penelitian tahun 2005 yaitu Acanthaster plancii, Fromia nomilis, Linckia laevigata dari kelas Asteroidea; Comanthina sp, Comanthus sp, Stephanometra sp dari kelas Crinoidea; Diadema setosum, Diadema savignyi, Echinometra mathei dari kelas Echinoidea; Holothuria atra, Holothuria edulis, Stychopus ananas dari kelas Holothuroidea. Sedangkan pada pengamatan tahun 2006 ditemukan sebanyak 13 spesies dari 4 kelas yaitu Culcita novaguinae, Fromia nomilis, Linckia laevigata dari kelas Asteroidea; Comanthina sp, Comanthus sp, Stephanometra sp dari kelas Crinoidea; Diadema setosum, Diadema savignyi, Echinometra mathei, Echinotrix calamaris dari kelas Echinoidea; Holothuria atra, Holothuria edulis, Stychopus ananas dari kelas Holothuroidea. Kata kunci: echinodermata, Indonoor wreck, P. Kemujan, Karimunjawa. Indonoor is a ship sunk in a reef slope of Kemujan Island, Karimunjawa Islands back in 1960. Since that the wreck was covered by coral reef and home of many reef associated marine fauna, and lately becoming most visited dive point in Karimunjawa for tourism purposes. Among many marine fauna lives on the wreck is echinoderm which is interested to be studied especially on its diversity. A modified line intercept and quadrate transect method was applied for the study in four parts of the shipwreck in May-June 2005 and September 2006. The result showed that at least 12 species of 4 classes of echinoderm was found in the 2005 sampling period i.e.: Acanthaster plancii, Fromia nomilis, Linckia laevigata (class Asteroidea); Comanthina sp, Comanthus sp, Stephanometra sp (class Crinoidea); Diadema setosum, Diadema savignyi, Echinometra mathei (class Echinoidea); Holothuria atra, Holothuria edulis, Stychopus ananas (class Holothuroidea). Meanwhile in 2006 sampling period was found at least 13 species of 4 classes consist of Culcita novaguinae, Fromia nomilis, Linckia laevigata (class Asteroidea); Comanthina sp, Comanthus sp, Stephanometra sp (class Crinoidea); Diadema setosum, Diadema savignyi, Echinometra mathei, Echinotrix calamaris (class Echinoidea); Holothuria atra, Holothuria edulis, and Stychopus ananas (class Holothuroidea) . Key words: echinoderm, Indonoor wreck, Kemujan Island, Karimunjawa

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