Marine Research in Indonesia (MRI - E-Journal)
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FISH COLLECTED DURING THE CORINDON II AND IV EXPEDITIONS
No full textThe check-list of the fish collected during the CORINDON expeditions (COR. II: 20 sampling stations in the Makassar Strait; COR. IV: 7 stations in Piru and Ambon Bay in the Moluccas) 2) is composed out of 110 species. Most of them are coming from depths between 250 m and 600 m; a dozen of species were found at less deep stations; two Apodes, of which one is the very rare Promyllantor, were collected at a 1000 m depth
DIRECT BACTERIA COUNTING IN THE BANDA SEA
No full textBacteria counting in the Banda sea were carried out in two seasons during Snellius II Expedition. In August 1984, representing the southeast monsoon where upwelling is expected, bacteria counts were higher than in February 1985, representing the northwest monsoon where downwelling is expected. Some biological parameters of the Banda Sea were in support of the bacteria numbers in the expected upwelling region
REPRODUCTIVE ASPECTS OF THE TROPICAL ABALONE, HALIOTIS ASININA, FROM SOUTHERN LOMBOK WATERS, INDONESIA
No full textThe main objective of this study was to determine reproductive strategy including major spawning season of tropical abalone (Haliotis asinina) from southern Lombok waters, Indonesia. Gonad bulk index, maturity stages and oocyte size frequency distribution were applied to document gonadal development and major spawning season. The results of this study show that H. asinina in southern Lombok waters displayed year-round spawning with a high proportion occurring in August - November, when gonad index dropped to a lower level and high proportion of partly spawned and/or spent ovaries occurred in the population. Gonad development and spawning in males and females occurred synchronously. The correlation between gonadal development and environmental factors are described and discussed
EFFECTS OF CYANIDE ON ORNAMENTAL CORAL FISH (CHROMIS VIRIDIS)
No full textThe use of cyanide particularly for fishing has caused concern for its impacts on aquatic marine life. This study was the first attempt to provide information on the effect of cyanide on tropical marine fish in Indonesia and aimed to determine the toxicity of cyanide to coral fish, Chromis viridis. The fish were exposed to 10,18,32,56 and 100 µg 1-1 of cyanide. These five cyanide concentrations were tested for 96- h period of exposure through a static-renewal. Cyanide was found to be very toxic to the fish. The 96-h LC50 of cyanide for juvenile of Chromis viridis was 41.3 µg 1-1. The toxicity of cyanide to C. viridis was 300 times stronger than that of the trace metal cadmium. Compared to milkfish fry (Chanos chanos), C. viridis was more sensitive to cyanide. It is estimated that at concentration of 32 µg 1-1 cyanide does not show observable effect (NOEC) to C. viridis. Meanwhile the lowest observable effect of cyanide (LOEC) to the fish is at a concentration of 56 µg 1-1
SPATIAL VARIATION IN POPULATION CHARACTERISTICS OF VENUS CLAM GAFRARIUM TUMIDUM RÖDING, 1798 (BIVALVIA: VENERIDAE) IN AMBON BAY, MALUKU
No full textAmbon Bay consists of two regions i.e. Inner and Outer Ambon Bay that was separated by Galala-Poka sill. Consequently these waters have different local environmental conditions that leads to the bivalve populations differences, one of them is venus clam Gafrarium tumidum. In this study, the distribution and spatial variation in population characteristics of of venus clam was quantified based on the analysis of their twelve shell dimensions from different populations. Fieldwork and analyses were conducted on April – Juni 2013. Total of 585 individuals of venus clam were found and could be divided into ten size-classes and three size categories i.e. small (< 23.11 mm), medium (23.12–32.05 mm) and large size (> 32.06 mm). The highest size-class density was found at medium size. Spatial distribution was related to the characteristics of sediment and other potential factors. Result of discriminant analysis showed that shell-width (SW) was the variable with the highest discriminating power and distinguishing between Inner and Outer Ambon Bay populations
BATHYMETRICAL FEATURES OF THE BALI-LOMBOK STRAIT
No full textThe full understanding of the distributio of the surface temperature and salinity requires the knowledge of the heat and water balance at the surface of the ocean as well as of the circulation. For southeast Asian waters the monthly averages of the climatological factors determining the heat and water balance are calculated and presented in the following for 15 regions
PRECIPITATION, EVAPORATION AND ENERGY EXCHANGE AT THE SURFACE OF THE SOUTHEAST ASIAN WATERS
No full textNone provided
THE STOMATOPOD CRUSTACEA COLLECTED BY THE MARIEL KING MEMORIAL EXPEDITION IN MALUKU WATERS IN 1970
No full textThe present material was collected by the Mariel King Memorial Expedition in Maluku waters, Indonesia, during May and June 1970. The author participated as the member of the Indonesian Institute of Sciences. Although the stomatopod collected was not very great in number of the species, but consist 3 new species, one new sub-species and some rare forms. The collection is deposited in the Institute of Marine Research, Jakarta. I would like to express my gratefulness to Dr. R.B. Manning for his help in literatures; to Dr. R. Serene for encouraging me to prepare this paper as well as his help in literatures and to Mr. Kasijan Romimohtarto for his advices
SPECIES DIVERSITY OF THE EPIBENTHOS IN A HIGHLY DISTURBED CORAL REEF COMMUNITY IN THE PHILIPPINES
No full textBaseline studies on the marine benthic communities around the proposed site of the first nuclear power plant in the Philippines have indicated a highly disturbed coral reef community. The areas studied are all subtidal, mostly starting just below the littoral and having an average depth of five meters. The study consisted in taking a census with SCUBA of the epibiota in quadrats on transects laid out perpendicular to the shoreline. Results of the sampling during the dry season indicate a predominantly algal (Padina) community of low species diversity. Many of the conspicuous components of Philippine coral reefs are either absent or are present only in small numbers, e.g., hard and soft corals, crinoids, tridacnids, and colorful serpulids. Dynamite fishing is no doubt a major factor responsible for the condition of the dead reefs. Weather and erosion of the land areas with the resulting siltation have probably contributed to the poor condition of the reef communities as well
DISTRIBUTION OF MONOGONONT ROTIFERS, Branchionus spp IN NORTH SULAWESI
No full textIn order to characterize the distribution pattern of rotifers Brachionus spp. in North Sulawesi, sample collections have been conducted at four locations, two at east coast and other two at west coast of North Sulawesi peninsula, which are connected to Maluku and Sulawesi Seas, respectively. At each location, a 40 p.m mesh size plankton net with a 0.3 m opening diameter was horizontally towed at three sites to represent coastal water, estuary and brachkiswater pond. Sampling periods were in January and August 2005 to represent west monsoon and east monsoon, respectively. Each sampling was performed twice a day during high and low tide. Some environmental factors were also measured in situ during the sampling. Three species of Brachionus were found during the survey, Brachionus rotundiformis, B. caudatus and B. quadridentatus. Their abundances were significantly different, both between locations and sampling sites. However, among the similar habitat such as between Manembo-nembo and Minanga brachkishwater ponds, B. rotundiforms abundance was not significantly different. This species was the most abundant compared to the other two species, in average 1984,4 ind/m3, while the other species was as low as 26,1 ind/m3 and 212,9 ind/m3 for B. caudatus and B. quadridentatus, respectively. The abundance of rotifers in northern areas connected to Molluccas Sea is higher compared to those in the southern areas connected to Sulawesi Sea. Distribution of B. caudatus is very similar to those of B. rotundiformis, while B. quadridentatus appears to have its specific pattern. Results of this study suggest that the abundance and species composition of the rotifers reflect trophic status of the aquatic ecosystem in the area. It is still awaiting future studies to elaborate the impacts of the trophic gradients in horizontal distribution of rotifers. Therefore, it is necessary to conduct a long term monitoring with emphasis on the structure of rotifer assemblages in a variety of sites subjected to environmental perturbations, including anthropogenic contaminant inputs