Marine Research in Indonesia (MRI - E-Journal)
Not a member yet
292 research outputs found
Sort by
OBSERVATIONS ON THE PRIMARY MARINE PRODUCTIVITY OF NORTHWESTERN INDONESIAN WATERS
No full textDuring the fall months of 1957, a scientific cruise was completed in some of the more northwestern fishery areas of Western Indonesia (Fig. 1) on the Indonesian research vessel "Samudera". One of the principal objectives of this cruise was to determine the rates at which inorganic carbon is converted to organic material relative to the waters of the Pacific further east. The physical nature of the waters and the hydrographic results of related cruises have been reported (e.g., SOERIAATMADJA, 1956a & b; SJARIF, 1959; WYRTKI, 1961) elsewhere
NEW AND FEW KNOWN SPECIES OF BRACHYURA FROM AMBON
No full textThe present material corresponds to a part of a collection made in Ambon by the senior author. The collection was made during a survey conducted (September 1970) by the Institute of Marine Research of Indonesia (see Serene 1971) and is deposited in this Institute in Djakarta
A NUMERICAL SIMULATION OF THE WIND-DRIVEN WATER CIRCULATION ON THE SUNDA SHELF
No full textA numerical simulation of the barotropic circulation over the Sunda Shelt was carried out for a time-invariant wind field corresponding to (a) the Northwest Monsoon and (b) the Southeast Monsoon seasons. Starting from a state of rest, the current and surface configurations were timestepped until an apparent state of equilibrium was reached. The resulting current pattern and sea-surface topography are in good agreement with observations during those two seasons
DISTRIBUTION OF CORAL COMMUNITIES ON REEF SLOPES IN THE MASCARENE ARCHIPELAGO, INDIAN OCEAN
No full textThree zones and sic "horizons" are defined and described on the basis of topographic elements, growth forms of corals, generic and specific diversity of scleractinians and associated fauna and flora - : Spurs and grooves zone of coral-built morphogenesis ("horizon superieur" 0-5m, "horizon intermediaire" 5-15m, "horizon inferieur" 15-20m); Spurs and grooves of volcanic morphogenesis 20-25m; Volcanic flagstone ("horizon superieur" 25-30m, "horizon moyen" with sponges and corals, 30-35m, "horizon inferieur" with gorgonians and antipatharia 35-50m). A total of 98 species belonging to 58 genera were collected on reef slopes. It was found that there is a successive increase in generic and specific diversity from the upper part (36 species), to 20 meters (63 species), related to the decrease of exposure to wave action. The decrease in the number of species from 25 (54 species) to 50 meters (?18 species), proves that light becomes a limiting factor below 25-30m. Nevertheless, sedimentation effects, biological competition (algae, sponges, alcyonarians….) and other factors are very significant in determining community structure of corals. A comparative study (quantitative and qualitative distribution, zonation) with other localities is suggested as conclusion
ECOLOGY OF THE DUGONG AND ITS MANAGEMENT
No full textToday, many people know that the mythical mermaids of legendal stories originated from the animals belonged to the order Sirenia. Sirenians can be devided into two groups, manatees of the Atlantic coasts and the dugong of the IndoPacific area. Table I shows the present living species belong to the order Sirenia
THE LEIOGNATHUS (TELEOSTEI): THEIR SPECIES, STOCKS, AND FISHERIES IN INDONESIA, WITH NOTES OF THE BIOLOGY OF LEIOGNATHUS SPLENDENS (CUVIER)
No full textSpecies of the family Leiognathidac in the Indo-Pacific area are often considered trash fish but are readily accepted in Indonesia, where about 50,000 tons were landed in 1975, 14,000 tons of which originated from the Malacca Strait area. The Western Jawa Sea, Karimata Strait and Indonesia's South China Sea stocks are underfished or, partially, even virgin and production from these stocks might be more than 100,000 tons a year. The leiognathid stocks, having their highest stock densities in very shallow waters (peak at 25 m depth) are easily overfished by trawling, while the bagan (lift-nets) tend to underfish them. In East Jawa, there is an annual periodicity in the fishery which is correlated with the rainfall, the peak landings being from December through March, while landings are lowest from July to September. Leiognathus splendens (CUVIER) makes up most of the leiognathid stock (90% and more). The main feature of the biology of this species — growth, reproduction and food are briefly discussed. A short selected bibliography of the Leiognathidae is given
THE LEIOGNATHIDAE (TELEOSTS): AN HYPOTHESIS RELATING THEIR MEAN DEPTH OCCURRENCE TO THE INTENSITY OF THEIR COUNTERSHADING BIOLUMINESCENCE
No full textAll species belonging to the Family Leiognathidae (genera Leiognathus, Secutor & Gazza) are bioluminescent. They emit during daytime a downward, diffuse light which tends to disrupt their silhouette, making them less discernible from beneath to potential predators. It is here assumed that the intensity of light emitted should correspond to the intensity of incident light at the depth at which each species generally occurs. Using published information on the relative intensity of emitted light in different species and quantitative data on the mean depth occurrence of the species, it is shown that there is a good correspondance in the ranking order of both light intensity and depth occurrence in five species (e.g. Secutor ruconius emits a strong light and occurs in shallow water; Leiognathus elongatus emits a weak light and occurs at greater depth). Species not fitting into this pattern (e.g. Leiognathus splendens emits a weak light but occurs in very shallow water) tend to occur in murky water, where less light is required for counterillumination
BIOLOGICAL STUDIES ON THE ANCHOVY, THRYSSA GAUTAMIENSIS BABU RAO (PISCES: ENGRAULIDAE)
No full textBiology of the anchovy, Thryssa gautamiensis BABU RAO, which forms a fishery in the Godavari estuary (East Coast of India) was studied for the three seasons, i.e. 1959-60, 1960-61 and 196162. The population pattern was studied during the three seasons by means of montly percentage length frequency curves and fitting normal curves. Length weight studies were made for the three seasons, the best fit equations to express the relationship have been calculated and differences of relationships within seasons have been tested. Relative condition ('Kn') variation studies have been made for the different length groups of the fish for the two sexes. The variations of fecundity in relation to length and weight of fish respectively were studied and the equation to express their relationships have been established. The spawning season and the sizes, of ova at different stages of maturity have been determined by means of ova diameter measurement studies. The food preferences of this species have been ascertained by studying the gut contents and their item wise percentage frequencies in different months
STOMATOPOD CRUSTACEA COLLECTED BY THE MISSION CORINDON II IN THE MAKASSAR STRAIT, INDONESIA
No full textSeventeen species of Stomatopoda belonging to five families have been collected in the Strait of Makassar, Indonesia during the Franco-Indonesian mission "CORINDON II". Four species of the family Squillidae: Kempina mikado, Lenisquilla spinosa, Oratosquilla imperialis, and O. ornata are for the first time reported to exist in the Indonesian waters
NIPPONOTROPHON MAKASSARENSIS, A NEW RECENTLY DREDGED MURICACEAN SPECIES OF STRANGE GENERIC AFFINITIES (GASTROPODA: MURICIDAE)
No full textA murieid, dredged by the French-Indonesian "CORINDON" expedition (1980) in the Strait of Makassar was recently brought to my attention. After carefully checking in the literatures, it appears to be new, but one problem was remaining unresolved: its classification in an appropriate genus