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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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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.

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Articles 7 Documents

Search results for , issue "Vol 23, No 1 (2018): Ilmu Kelautan" : 7 Documents clear

Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan Colin K. C. Wen; Li-Shu Chen; Kwang-Tsao Shao
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Spatial and temporal variations in the species composition of assemblages are common in many marine organisms, including fishes. Variations in the fish species composition of subtidal coral reefs have been well documented, however much less is known about such differences for intertidal fish assemblages. This is surprising, given that intertidal fishes are more vulnerable to terrestrial human disturbances. It is critical to evaluate the ecology and biology of intertidal fishes before they are severely impacted by coastal development, especially in developing countries such as those in the tropical western Pacific region where coastal development is rapidly increasing. In this study, we investigated the species composition, abundance, biomass and species number (richness) for intertidal fish assemblages in subtropical (northern) and tropical (southern) Taiwan across four seasons by collecting fishes from tidepools using clove oil. We also examined the gut contents of collected fishes to identify their trophic functional groups in order to investigate regional and seasonal variations for different trophic groups. We found significant differences in the species composition of tidepool fish assemblages between subtropical and tropical Taiwan. Bathygobius fuscus, Abudefduf vaigiensis and Istiblennius dussumieri were dominant species in subtropical Taiwan, whereas Bathygobius coalitus, Abudefduf septemfasciatus and Istiblennius lineatus were dominant in tropical Taiwan. Other species such as Bathygobius cocosensis, Abudefduf sordidus and Istiblennius edentulus were common in both regions. For trophic groups, omnivores and detritivores had or showed trends towards higher species numbers and abundances in the subtropical region, whereas herbivores, planktivores and general carnivores had or showed trends towards higher species numbers and biomass in the tropical region. Overall, many intertidal fish species and trophic groups showed differences in abundance, biomass and species number between subtropical and tropical Taiwan. Further studies on large scale geographical gradients in trophic groups and species compositions in the Indo-west Pacific region are encouraged to assist with ecosystem monitoring and assessment. Keywords: Intertidal fishes, spatio-temporal pattern, feeding guild, diet

Relationship Between Stage of Gonad Maturity and Level of Osmotic Work of Sea Cucumber, Paracaudina australis Widianingsih Widianingsih; Muhammad Zainuri; Sutrisno Anggoro; Hermin Pancasakti Kusumaningrum; Retno Hartati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The holothuroid spawning can be succesful depend on varoius factors such as salinity, temperature, primary productivity and other physiological adaptation toward environment influences. The salinity fluctuation is one of the environment factors, which influence and can cause various osmotic pressure of coelomic fluid of Holothoroid and also gonad maturity stage. Holothuroid (sea cucumber), Paracaudina australis, is overexploited in Kenjeran waters, Surabaya, East Java. The study was aimed to reveal relationship between gonad maturity stage and level of osmotic work of sea cucumber P. australis. Fifty samples of P. australis were collected monthly. Coelomic fluid samples of approximately 200–1000 µl were obtained from all samples using disposable insulin syringes. There were 37 holothuroids classified in the late maturity (stage 5), 74 holothuroid in the earlier maturity stage (stage 1). Gonad maturity stage 5 (late maturity) could be reached on December 2016. Contrasly, the gonad maturity stage 1 (earlier maturity) was found on August 2016. The analysis of coelomic fluid showed that the average value of level of osmotic work ranged 70 to 91 mOsm/L H2O in the earlier gonad maturity stage. Contrasly, in the late maturity, the average value of level of osmotic work ranged 118 to 156 mOsm/L H2O. There is relationship between gonad maturation stage and level of osmotic work. From stage of gonad maturity 1 to 5, there were upward trend level of osmotic work in coelomic fluid of P. australis.

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants Ambariyanto Ambariyanto; Diah Permata Wijayanti; Munasik Munasik; Puji Eka Purnama; Mu’alimah Hudatwi; Ni Made Ernawati; Alferd Y. Ko'ou
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Pollution is one of the important issues faced by marine resources including zooxanthellae, which is known to be very sensitive to environmental changes. Some pollutants have been reported to have adverse effects on zooxanthellae, however, their sensitivity in regards to changes on cell size of these algae has not been widely explored. This study examined the effects of pollutants on the sensitivity of zooxanthellae through changes in size. Zooxanthellae were isolated from corals Porites lutea, Acropora aspera, and Montipora digitata collected from Panjang Island, Jepara, Indonesia. These algae were exposed to pollutants i.e. heavy metals (Cu, Cd, Pb) and nutrients (ammonium and phosphate) at concentrations of 5,10,15 ppb and 5,10,15 μM, respectively. Zooxanthellae size were measured five hours after pollutants exposure. The results showed that all treatments reduced the size of zooxanthellae. Algae isolated from P. lutea are the least affected by pollutants and the highest percentage cell size reduction was found in phosphate treatment. However, reduction on the size of algae were not statistically significant. These results indicate that in relation to reduction in the size, zooxanthellae are not sensitive to pollutants. Keywords: Zooxanthellae, pollutants, sensitivity, size reduction

Nutritional Content of Wild and Cultured Eel (Anguilla bicolor) from Southern Coast of Central Java Ima Wijayanti; Endang Sri Susilo Setiyorini
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Culture of eel is being pursued in Indonesia, including Central Java,however there has been no data about proximate analysis of both wildand cultured eel. The purpose of this study was to determine the nutritional content of both the wild and the culturedeel Anguilla bicolor from Southern coast of Central Java. Nutritinonal content observed were moisture, protein, fat, ash and carbohydrates content, Vitamin A, Vitamin E and Mineral (Mg, Zn, Ca, Fe). The samples were obtained from Cilacap, Central Java. The data were analyzed by t-Test of Paired Two Sample for Means to determine difference of nutritional content between the wild and the culturedeel. The level of protein, carbohydrates, and Vitamin A were significantly different (P<0.05) between the wild and the cultured one. Whereas the content of water, fat and ash were not significantly different. Furthermore, there was no significant difference the Vitamin E level between the wild and the culturedeel.Mineral levels between the wild and cultured showed significantly different in Mg, Zn and Fe, but not significantly different in Ca. The moisture, protein, carbohydrate, fat, ash, vitamin A and vitamin E content of the wild eel were 62.81%, 16.20%, 1.39%, 17.92%, 1.34%, 3316.38 mg.100g-1, and 0.21% respectively, while the cultured eel were 62.36%, 17.50%, 0.13%, 17.72%, 1.33%, 2068.55 mg.100g-1 and 0.224%, respectively. Magnesium (Mg); Zinc (Zn); Iron (Fe) content of wild and cultured eel respectively 145.35 ppm; 20.9 ppm; 48.08 ppm and 121.97 ppm; 24.44 ppm; 30.99 ppm. Calcium (Ca) content wild and cultured eel were 0.52% and 0.48% respectively. Keywords : Anguilla sp, proximate, vitamin, mineral

Spatial and Seasonal Distribution of Cadmium and Lead in Sediment, Water and Its Response of Metal Transcription Factor-1 in Cardinal Fish Apogon beauforti Dominggus Rumahlatu; Estevanus Kristian Huliselan; Sriyanti Imelda A Salmanu
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Cadmium (Cd) and lead (Pb) are known to have high toxic effects and have been found polluting marine environment. Regular monitor the concentration of heavy metals in marine waters is necessary by combining chemical and biological analysis. This research was conducted to analyze the levels of heavy metals in sediment, water column, cardinal fish Apogon beauforti, and to measure the concentration of MTF-1 protein in A. beauforti. This research was conducted at four sampling stations at Ambon bay for 2 years. The levels of Cd and Pb metals were analyzed using AAS instruments (Atomic Absorbsion Spectrophotometer), while the concentration of MTF-1 protein in the body of A. beauforti was analyzed using indirect ELISA. The results showed that the seasonal and spatial distribution of heavy metals Cd and Pb at Ambon bay did not show any variation. The results of the ANOVA proved that the concentrations of heavy metals Cd and Pb in the four research stations were not significantly different in the year 2013 and in the year 2014 in the samples of sediment, the water column, and the body of A. beauforti. In addition, it was revealed that the concentration of MTF-1 protein of A. beauforti in 2014 was higher than that in 2013, with an average of the concentration of MTF-1 protein of A.beauforti was higher at station 2, which was at Ferry Galala Harbor. Keywords: distribution, spatial, seasonal, cadmium, lead, MTF-1, Apogon beauforti

Growth, Agar Yield and Water Quality Variables Affecting Mass Propagation of Tissue Cultured Seaweed Gracilaria verrucosa in Pond Sri Redjeki Hesti Mulyaningrum; Hidayat Suryanto Suwoyo
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Mass propagation of tissue culture produced seaweed seedling was conducted in the pond. The present study aims to evaluate the growth of tissue culture produced seaweed seedling of Gracilaria verrucosa, its agar yield and related water quality variables during propagation in pond. The seedling propagation was conducted in pond using long line method for 9 cycles (30 days per cycle). The daily growth rate was calculated by weighing 30% of the total amount of seaweed at ropes line every 15 days. Agar yield was analyzed every 30 days in hot water extraction method. Water quality monitoring was conducted every 15 days. The data of daily growth rate and agar yield were analyzed descriptively. A simple linear regression analysis was conducted in order to analyze the relationship between growth and agar yield as well relationship between water quality variables, growth and agar yield. The result showed that the average daily growth rate of nine cycles was 3.38±1.49%. The highest agar yield was yielded from cycle II (27.84±1.60%) and the lowest was in cycle I (10.30%±2.15). There is no relationship between daily growth rate and agar yield (R2=0.055). Daily growth rate was mostly influenced by phosphate (P<0.05), nitrate (P<0.05), salinity (P<0.05) and light penetration (P<0.05). Meanwhile, agar yield was mostly influenced by temperature (P<0.05) and light penetration (P<0.05). Present study promising for seaweed G. verrucosa mass cultivation of tissue culture product which is a feasible alternative method to supply seaweed seedlings in seaweed farming development. Keywords: growth, agar yield, G. verrucosa, tissue culture, water quality

Review on Dissolved Organic Carbon and Particulate Organic Carbon in Marine Environment Radha Karuna Kumari; P. M. Mohan
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 1 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Quantification the Dissolved and Particulate organic carbon in marine waters is an essential step towards ecosystem modeling and understanding carbon sequestration processes. A detailed view of estimated and recorded carbon concentration from Arctic to Antarctic is the prime goal of this review. This review compiles some of the important research work carried out in quantifying the organic carbon available in off shore and open waters and in coral reef environment. The cited literatures were collected, grouped and carefully analyzed to give a comprehensive view on current status of marine environment with regard to distribution of dissolved and particulate organic carbon. Keywords: DOC, POC, continental shelf waters, open sea waters, coral reef environment.

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