Marine Research in Indonesia (MRI - E-Journal)
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A TEST OF HANSEN'S METHOD WITH IRREGULAR BOUNDARIES
No full textFree, long seiches in a rectangular basin were simulated with Hansen's method applied in two ways: (1) with the basin boundaries coinciding with the grid coordinate axes, and (2) with the basin boundaries inclined 45 degrees to the grid axes. There was good agreement between the two cases, and with the theoretical solutions
DISTRIBUTION AND ABUNDANCE OF CRYPTOFAUNA FROM LIZARD ISLAND, GREAT BARRIER REEF
No full textA series of replicate samples of dead coral reef habitats was collected across Yonge Reef on the outer and inner reef (back reef) and on fringing reefs around Lizard Island. Five categories of habitats were selected, branching, thin plates, high percentage of live coral, solid reef, rock with either a small surface area or a large surface area, and easily broken up. The surface area, volume, percentage cover of epifauna and flora, and biomass of cryptofauna were determined for each habitat. An estimate of the percentage of cavity space (i.e. available living space for cryptofauna) occurring in each habitat was made. The cryptofauna is dominated by polychaetes, molluscs, and sipunculans. Habitats on inner Yonge have a larger biomass of cryptofauna than similar habitats found on outer Yonge or on fringing reefs around Lizard Island. Differences in physical attributes of the habitat together with exposure and surrounding species of coral and sponges may be responsible for these differences
MARINE MANAGEMENT AND THE SITING OF ELECTRICAL GENERATING STATIONS ON TROPICAL SHORELINES
No full textExpanding utilization of electricity by developing tropical nations will produce increasing amounts of waste heat that will, in most cases, be disposed into natural water systems. Such disposal represents a serious potential marine management problem for nations which intensively utilize the nearshore marine environment in their subsistence economy. This communication reviews the marine environmental effects resulting from thermal disposal at three generating stations on the Island of Oahu, Hawaii and compares these with results of similar studies made elsewhere in the tropics and subtropics. Conclusions are drawn from these studies concerning desirable environmental features to be considered for thermal outfalls in tropical areas, and some environmental consequences of alternative methods of cooling water treatment are discussed
TEMPERATURE OBSERVATIONS IN THE WATER-OFF MUARA KARANG
No full textDuring the period of March 1975 to February 1976 a survey was carried out in the water off Muara Karang, Jakarta Bay. Water temperature were slightly higher than those in the open sea, and showed a seasonal variation. The seasonal variation axe affected by meteorological conditions, incoming water from neighbouring seas, and by the land mass
THE NUMERICAL MODELLING OF TIDES IN A SHALLOW SEMI-ENCLOSED BASIN BY A MODIFIED ELLIPTIC METHOD
No full textA numerical model which renders possible the numerical solution of the nonlinear tidal equations by obtaining a solution for each individual tidal component is developed. For this purpose, a set of time independent non-linear equations for each tidal constituent is constructed. Each of these sets of equations is interrelated through the non-linear frictional terms, the approximation of which is accomplished by an iterative scheme. The method is tested for several models before it is applied to the real basin (Bight of Abaco). In order to evaluate the model and to construct the boundary conditions along the opening, a series of tidal observations were undertaken. The viability of the method is indicated by the fact that the results of computations using a coefficient of friction r = 0.0034 give good agreement with observations for all components and over all stations
PENAEOID SHRIMPS (BENTHESICYMIDAE, ARISTEIDAE, SOLENOCERIDAE, SICYONHDAE) COLLECTED IN INDONESIA DURING THE CORINDON II AND IV EXPEDITIONS
No full textDuring the CORINDON II and IV expeditions, the former in the Makassar Strait and the latter in Piru Bay and Ambon Bay, Molluccas, 47 species of penaeoid shrimps were collected. They include 2 species belonging to the Benthesicymidae, 5 to the Aristeidae, 19 to the Solenoceridae, 2 to the Sicyoniidae and 19 to the Penaeidae
THE DISTRIBUTION AND SOME ECOLOGICAL ASPECTS OF MARINE ALGAL GENUS EUCHEUMA IN THE INDONESIAN WATERS
No full textEight species of Eucheuma ait found to grow in the Indonesian waters making the amount of species of Eucheuma which had been found become 17 species. A certain species specifically found only in certain areas. Those species are usually found at the depths of 30 to 150 cm during low tide at the reef flat, moat and algal ridge of the coral reefs where temperatures and salinities varied from 29° to 31° and from 30 to 34‰ respectivelly. There are various habitats of Eucheuma i.e. dead and live corals, limestones, sand and shells. Average wet weight biomass of Eucheuma species at the areas investigated varied from 2 to 552 g/m . The highest value is that of Eucheuma spinosum found in East Seram (Maluku), and the lowest is that of E. cottonii found in the Keifing Island, East Seram. The species of Eucheuma commonly found in association with Acanthopora, Gracilaria and Halimeda. ABSTRA
PREFERENCE OF TEMORA STYLIFERA (CALANOID COPEPOD) FOR PLANKTONIC CILIATES AND EGG PRODUCTION
No full textThe investigation of feeding and egg production of the calanoid co pepod Temora stylifera was carried out between September and November 1988. The copepods were fed on natural ciliates and phytoplankton assemblage. Planktonic ciliates composed of 2.20 to 3.83 g C l -1 representing 15.2 to 58.7% of total biomass in standing stock. They were consumed by these copepods at rates ranging from 11.25 to 38.14 g C mg DW-1 d-1 or about 27.6 to 74.8% of total food consumed. The increase of ciliates/phytoplankton biomass ratio in the food consumed by the copepods in the all experiments indicates the preference for ciliates, in which as a good quality of food they can improve the rates of copepods egg production
MARINE CAPTURE FISHERIES POLICY FORMULATION AND THE ROLE OF MARINE PROTECTED AREAS AS TOOL FOR FISHERIES MANAGEMENT IN INDONESIA
No full textThe FAO Code of Conduct for Responsible Fisheries states that conservation and management decisions for fisheries should be based on the best scientific evidence available. Studies show that most of Indonesia's capture fisheries are either full or over-exploited. However, the fishery sector is still expected to contribute to the increase of Indonesia's GNP through an increase in total catches. Furthermore, the current practice of using catch-effort data and Maximum Sustainable Yield models to inform Indonesia’s fisheries policies is flawed, putting sustainability and long-term profitability of Indonesia's fisheries at risk. In this paper, the authors argue that to ensure the survival of Indonesia's fish stocks and fisheries: fisheries policy must shift from development-oriented management towards management for sustainability. Furthermore, fisheries managers must accept that 'untapped resources' may not exist or cannot be exploited profitably, and that any transfer of fishing effort between fishing grounds may contribute to collapse of local fisheries. Also, fisheries managers should change the management paradigm from MSY models to eco-system based management, wherein Marine Protected Areas should play an important role
MANGROVE BRACHYURAN CRABS IN WORI, NORTH SULAWESI, INDONESIA
No full textThe study for faunal diversity from mangrove sites in Wori were very less work carried out, especially on brachyuran crab taxa. Healthy mangrove forests provide a critical for many species of Crabs in intertidal and estuarine areas are keys to healthy marine ecology. Mangroves are the most suitable feeding, breeding and nursery grounds for crabs and other crustaceans. In this study, the habitat distribution and diversity of crabs in Wori mangrove environment was recorded from October 2015 and August 2016. In view of the significance of the mangrove habitat, in present study we selected three station with different habitat specifications as in Wori Seaward (WSW), Wori Middle zone (WMZ) and Wori Landward (WLW). Total 15 species and 307 individuals of brachyuran crabs were recorded belonging to 10 genera and 6 families. Crabs belonging to family Sesarmidae was most dominant with 7 species. The other major outcome of study was maximum diversity was found at Wori Landward (WLW) site with 13 species, followed by Middle Zone (WMZ) site with 11 species and Wori Seaward (WSW) site with 10 species.