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INDONESIA
Marine Research in Indonesia
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : 02162873     EISSN : 24432008     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
MARINE RESEARCH IN INDONESIA (MRI) has been published since 1956 by Indonesia's oldest marine research institute, the Research Center for Oceanography of LIPI (Indonesian Institute of Sciences). MRI focuses on physical, chemical, biological, geological oceanographic as well as coastal management studies in the Indonesian seas and the adjacent Indo-Pacific region.
Arjuna Subject : -
Articles 22 Documents
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Search results for , issue "Vol 19 (1977)" : 22 Documents clear
THE LEIOGNATHIDAE (TELEOSTS): AN HYPOTHESIS RELATING THEIR MEAN DEPTH OCCURRENCE TO THE INTENSITY OF THEIR COUNTERSHADING BIOLUMINESCENCE Pauly, Daniel
Marine Research in Indonesia Vol 19 (1977)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1459.976 KB) | DOI: 10.14203/mri.v19i0.377

Abstract

All 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) Rao, M. Babu
Marine Research in Indonesia Vol 19 (1977)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2306.421 KB) | DOI: 10.14203/mri.v19i0.378

Abstract

Biology 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.

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