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ILMU KELAUTAN: Indonesian Journal of Marine Sciences
Published by Universitas Diponegoro
ISSN : 08537291     EISSN : 24067598     DOI : -
Core Subject : Science,
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.
Arjuna Subject : -
Articles 743 Documents
 57   58   59   60   61 
Seawater Masses Characteristics of The Bali Sea Based on CTD Yo-Yo Casting Gentio Harsono; Budi Purwanto; Rudy A.G. Gultom; Tunggul Puliwarna; Johar Setiyadi; Kentaro Ando; Mario Cobral
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 4 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.4.282-297

Abstract

The Bali Sea is located between the Java Sea and the Lombok Strait, which is one of the Indonesian Through Flow  exits, especially the western route. These waters are possible to be the meeting place and mixing of two water masses with significantly different characteristics, that is the watermass brings by Indonesian Through Flow and Indian Ocean watermass. This study describes the watermasses and its turbulent mixture in the Bali Sea using CTD Yo-Yo casting data and spatial monsoonal wind distribution. The vertical distribution of energy dissipation rate and diapycnal diffusivity in the Bali Sea was computed based on measurement data during KRI RIGEL 933 expedition on April, 2021. KRI RIGEL is operated by Hidro-Oceanographyc Center Indonesian Navy’s. Identified 4 types of water masses in a row, there are Java Sea water masses, mixed water masses between Java Sea and ITF, NPSW and NPIW with modified water mass property characters. The internal tides formed in the sills of the Lombok Strait are thought to contribute to the turbulent mixing parameters in the Bali Sea. The values obtained for energy dissipation and diapycnal diffusivity are 1.58 x 10-9 W Kg-1 and 5.07 x 10-5 m2 s-1, respectively. The value of this turbulent mixing parameter is confirmed to be smaller than the mixing value in the Lombok strait and is equivalent to the open sea. It is seen that there is a transformation of water mass which is marked by a shift in the density value in the identified water mass type.
The Influence of Food Availabity on the Shell Growth of Sea Scallop Placopecten magellanicus (Gmelin, 1791) Adi Santoso
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 1 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.9.1.8-13

Abstract

Abtract
Estimation on Mortality of Tropical Limpet Cellana testudinaria (Class : Gastropoda, Family : Patellidae) Living on the Rocky Shore of Ohoiwait, Southeast Moluccas, Indonesia Abraham Seumel Khouw
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 1 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.14.1.1-7

Abstract

Sebanyak 2402 ekor limpet diperoleh dari 12 bulan pengambilan sampel yakni dari Oktober  2001 sampai September  2002. Rata-rata mortalitas limpet C. testudlnaria diestimasi dengan mempergunakan tiga metoda yang berbeda  dengan hasil adalah sebesar 94% per tahun (Z =2.81).  Mortalitas terbesar yang dilakukan dengan menggunakan pendekatan metoda Ault-Ehrhardt   dijumpai pada bulan Oktober 2001 dan April 2002, dimana terjadi kekeringan dan hempasan gelombang yang terbesar. Akan tetapi  tidak ada korelasi yang jetas antara mortalitas dan faktor-faktor  lingkungan. A total oF 2202 limpets were obtained  in 12 monthly collections (from October 2001 to September  2002). The mean mortality oF C. testudinaria was estimated, using three different methods;   reduction in the survival  of individual size frequency cohorts through  time, monthly calculation of the Ault  and Ehrhardt moment estimation, and length-converted catch curves. to be 94% per year  (Z = 2.81). Highest monthly mortality rates, determined with the Ault-Ehrhardt approach, were observed  in October 2001 and April  2002,  when  desiccation  stress (temperature of the rocky  surface  was about  4O0C) and  wave  action  (was about  3 m),  respectively,    were highest   However,   there  was no significant linear correlation  between  mortality and environmental   variables.
Perkembangan Awal Larva Tiram Mutiara (Pinctada fucata) pada Tingkat Salinitas yang Berbeda Anindya Wirasatriya; Jusup Suprijanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 9, No 1 (2004): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.9.1.14-19

Abstract

Salah satu bagian dari usaha pembenihan adalah pemijahan, dimana salinitas merupakan faktor yang sangat penting terutama pada proses fertilisasi dan perkembangan awal larva sampai fase D-type. Penelitian ini bertujuan untuk mengetahui pengaruh salinitas terhadap perkembangan awal larva tiram mutiara (Pinctada fucata). Terdapat 4 perlakuan salinitas pada penelitian ini sebagai media perkembangan awal larva tiram mutiara, yaitu 27 ‰, 30 ‰, 33 ‰, dan 36 ‰• Hasil penelitian menunjukkan bahwa ternyata perbedaan salinitas sangat mempengaruhi perkembangan awal larva P. fucata baik dari segi waktu pembentukan D type maupun kenormalan bentuk larva yang dihasilkan. Salinitas media mempengaruhi tingkat kerja osmotik larva dan proses pembentukan cangkang. Salinitas optimum untuk perkembangan awal larva tiram mutiara (P. fucata) adalah 33 ‰ dimana waktu perkembangan awal larvanya berlangsung dalam waktu yang paling singkat yaitu 1053,33 menit dan tidak terjadi ketidaknormalan bentuk larva. Akibat terjadi peristiwa plasmolisis dan plasmolisis, pada salinitas 27 dan 36 terjadi ketidaknormalan bentuk larva yang dihasilkan.
Metabolite Transfer Between the Intestinal-Loop and the Gonadal Tissue in Pecten maximus (Molusca, Bivalvia) Ita Widowati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 6, No 4 (2001): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.6.4.315-323

Abstract

Problem of metabolite transfers from intestine to gonadal acini by way of macrophagous haemocytes was investigated in scallop Pecten maximus. A 1 ml of 4 mg/ml solution of Cadmium-free ferritin (Sigma) was injected into the lumen of the proximal extremity of descending portion of the intestine. Two types of experiments were carried out, in vivo and in vitro. For the first, observation by light and electron microscopy was showed that ferritin was detected in the lumen and between the microvilli. In the intestinal cells, ferritin was observed in the vacuoles and lysosomal type. Under basement lamina, it is noted the presence of ferritin on underlying connective tissue, macrophagous haemocytes and near the gonadal acini male and female. The in vitro experiments gave the same results. Based on these results. it is concluded that intestine play a role in the nutrition for gametogenesis and that the metabolite transfer is by way of macrophagous haemocytes.
Lead (Pb) Biosorption by Intact Biomass and Alginate Extract of Sargassum crassifolium Originated from Gresik Regency Waters Faisol Mas’ud; Muhammad Browijoyo Santanumurti; Mohamed Hosny Gabr; Mamdouh T Jamal; Norma Aprilia Fanni; Moch Saad
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.159-168

Abstract

The fisheries potential in Gresik Regency is in danger from industrial lead (Pb) pollution. One possible solution is using Sargassum crassifolium, which acts as an absorbent to eliminate Pb in waters. S. crassifolium is characterized by its great affinity for metal cations to bind heavy metal content. This study aimed at finding the effect of S. crassifolium in different forms (wet, dry, and alginate) to absorb Pb content in water. This research was conducted from July to September 2020. The water sample was taken from Gresik Regency and S. crassifolium was obtained from farmers in Talango Island, Sumenep District, Madura. The effectiveness test of the three treatments was conducted based on contact time and biomass factor. Based on the contact time, each treatment was compared with the contact time (1, 7, and 14 days) with 10 g mass per treatment. Meanwhile, for the biomass factor, each treatment was compared by weight (10, 20, and 30 g) for 7 days. The contact time showed that in 14 days, the alginate form of S. crassifolium had the highest absorbent power with 1.370±0.0034 mg.L-1 of lead absorbed and 100% absorbed value. Based on the absorbent mass treatment, 10 g alginate gave the best result with the absorbed lead of 1.364±0.0028 mg.L-1 and an absorption value of 99.71%. The water quality showed that parameters of Dissolved Oxygen (DO), salinity, and nitrates from Gresik Regency were not above standard due to heavy metal pollution. S. crassifolium treatment could decrease the nitrite and nitrate values while increasing DO although still below the standard. This study indicated that 10 g alginate of S. crassifolium in 14 days was effective as a bio-absorbent for Pb heavy metal.
Dinoflagellate Cyst Distribution in Relation to the Sediment Composition and Grain Size in the Coastal Area of Pangkajene, South Sulawesi, Indonesia Arief Rachman; Hikmah Thoha; Mariana Destila Bayu Intan; Oksto Ridho Sianturi; Yunia Witasari; Singgih Prasetyo Adi Wibowo; Mitsunori Iwataki
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.111-123

Abstract

Dinoflagellate cysts have an important role for their bloom dynamics, which are commonly deposited along fine sediment grains and become the source of the next bloom. This study aimed to describe the cyst banks species composition, and their relationship with the sediment particles size and plankton composition in the coast of Pangkajene, South Sulawesi. Cysts observed in this study were extracted from seabed sediments collected from 9 sites. A potential cyst bank, with a cyst density of 240 cysts.g-1 sediment wet weight was found at PK-19, located in proximity to a large harbour complex. Although unusual, cyst density was significantly and positively correlated with the percentage of gravel. In contrast, the diversity of cysts seems to be affected by the percentage of fine sediments, such as silt and clay. None of the sediment composition was found strongly and significantly affecting both cyst density and diversity. A southward increase in cyst density was similar to the trend in the cell density of its planktonic form. Cysts of Protoperidinium spp., Scrippsiella spp., and Pheopolykrikos hartmannii were common and abundant in the sediment. Aside from Protoperidinium spp., most dinoflagellate species found in cyst form were absent from the water column. The occurrence of cysts of harmful dinoflagellates with records of devastating blooms in other coastal areas in Indonesia, such as Margalefidinium polykrikoides, Pyrodinium bahamense, and Gymnodinium catenatum, signifies a need to regularly monitor the area around Pangkajene coast to mitigate impacts of future blooms.
Heavy Metals (Hg, Cd, Pb, Cu) in Greenback Mullets (Planiliza subviridis Valenciennes, 1836) from Bojonegara coastal waters, Banten Bay, Indonesia Ghinarrahmi Afiyatillah; Sulistiono Sulistiono; Sigid Hariyadi; Charles PH Simanjuntak; Etty Riani; Rita Rostika; Sonja Kleinertz
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.169-180

Abstract

Waste from industrial activities can be a source of pollution for the waters of Banten Bay. One source of these pollutants are heavy metals. High concentrations of heavy metals in waters can pollute the aquatic environment, endangering all organisms. Heavy metals can accumulate in aquatic environments and living organisms such as fish. The greenback mullet Planiliza subviridis (Valenciennes, 1836) is known as a fish for human consumption. Heavy metals that are contained in mullets can move to a higher trophic level within the food chain and endanger the health of humans. This study aims to analyze the accumulation of heavy metals, such as Hg, Cd, Pb, and Cu, in the flesh of greenback mullets at Bojonegara Waters of Banten Bay. The research was carried out for five months (August - October 2020 and March - April 2021). Samplings were taken from Terate River and Wadas River, which are mullet fishing areas and natural habitats of these mullets. Data analysis consisted of descriptive and quantitative analyses. The results showed that the Hg, Cd, Pb, and Cu contents were below the quality standards based on Government Regulation of the Republic of Indonesia (PP RI) No. 22 of 2021. The greenback mullets have experienced a moderate accumulation rate. The different rates of Cu metal accumulation in each month indicate a variation in catches with low to moderate accumulation rates. The water conditions in Bojonegara can still be seen as tolerable and still suitable for mullets usable for human consumption in a reasonable amount. Monitoring and evaluation activities need to be carried out periodically for the management of the aquatic environment in Bojonegara.
Mangrove Habitat Structure of Mud Crabs (Scylla serrata and S. olivacea) in the Bee Jay Bakau Resort Probolinggo, Indonesia Audina Putri; Dietriech Geoffrey Bengen; Neviaty Putri Zamani; Ummu Salma; Novian Prahandhy Kusuma; Nanda Tiara Diningsih; Sonja Kleinertz
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.124-132

Abstract

Mud crabs (Scylla serrata and S. olivacea) are important fisheries resources, but their population in nature is decreasing due to anthropogenic activities, like the deforestation of mangrove forests. Hence, it is crucial to conserve this marine biota for future sustainable use and to conserve our marine biodiversity. Conducting studies on the biological interactions of mud crabs in mangrove habitats can be one of the future conservation approaches. Accordingly, an analysis of the functional relationships between Scylla spp. abundance and the respective mangrove habitat have to be carried out. The research was conducted in the mangrove ecosystem of Bee Jay Bakau Resort Probolinggo (BJBR). Data were collected using line transects and quadrant transects. The Associations between mangroves and mud crab habitat structures were analyzed using the Correspondence Analysis (CA) method. The results show that the relationship matrix between Scylla spp. and the structure of the mangrove habitat is centered on the F1 and F2 factorial axes (89.22%). S. serrata of all size classes were associated with dense mangroves (≥15 trees per 100m2) and high salinities (3-4 ppt), while S. olivacea has shown to be associated with rare to very dense mangrove systems. It indicates that S. olivacea tends to have a higher adaptation rate than S. serrata in this mangrove system. This study will provide information and recommendation for the conservation management of mud crabs and mangrove ecosystems to conserve marine biodiversity.
Growth Performance of Layang (Scad) Fish (Decapterus russelli, Ruppell 1830) Caught from Tomini Bay, Indonesia Abdul Hafidz Olii; Elena Wonneberger; Nuralim Pasisingi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 2 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.2.181-188

Abstract

Regarding exploitation and optimizing fisheries resources management in Tomini Bay, the Layang scad fish (Decapterus russelli, Ruppell 1830) is one of the small pelagic fishes inhabiting the bay that still lacks biological information. The species becomes the main target commodity for local fishers as it is commonly consumed as a protein source for coastal communities. This study aimed to determine the length-weight relationships and the growth pattern of Layang fish caught by fishers from Tomini Bay. The samples were collected once per month at Gorontalo City Fish Landing Spot from April to June 2020. Tomini Bay was confirmed as the fishing ground of all the landed fish. Layang is caught by Mini purse seines with a minimum mesh size of ¾ inch. A total of 896 samples of Layang fish were collected randomly from the fishers' catch during their unloading activity at the landing site. Abdomen dissection was performed on all samples for determining the fish’s sex. The fish samples' total length and body weight were measured using a ruler (nearest = 1 mm) and a scale (nearest = 0.01 gram). The result revealed that the length-weight equation of male Layang was W = 0.000004 L3.1972 (R2 = 97.57%), and that of female was W = 0.0000007 L3.0613 (R2 = 98.99%). This result implied a positive allometric growth pattern, excluding the females in April 2020.

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