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Agung Setiarto
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THE MEASUREMENT OF CHLOROPHYLL a CONCENTRATION IN THE COASTAL WATERS ADJACENT TO KARANGANYAR SHRIMP PONDS, TUGU SEMARANG Agung Setiarto; Suradi .
JOURNAL OF COASTAL DEVELOPMENT Vol 3, No 1 (1999): Volume 3 Number 1 Year 1999
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

In order to determine the extent of eutrophication due to pollution of organic matter from brackishwater shrimp ponds, on the north coast of Central Java, chlorophyll a and nutrient concentration were measured in near shore waters. It was revealed that chlorophyll a content in the study area were considerably high, ranging between 83 and 332 µg/l. The evidence of eutrophication was also supported by the relatively high level of nutrient, in which nitrate levels ranged between 1.295 and 2.060 mg/l and phosphate ranged between 0.093 and 0.270 mg/l. The relationship of chlorophyll a and nitrate indicated negative of chlorophyll a and phosphate also indicated negative correlation with regression : P = - 0.2587 Chl a + 0.1945. This suggests that the increase in chlorophyll a is accompanied by a reduction of both nitrate and phosphate, which may be caused by luxurious consumption of nutrient by phytoplankton in the surface water.
MOLTING AND SPAWNING SYNCHRONY IN Marsupenaeus japonicus FROM TOKYO BAY Agung Setiarto
JOURNAL OF COASTAL DEVELOPMENT Vol 9, No 2 (2006): Volume 9, Number 2, Year 2006
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

This study was the first attempt to examine the molt stage and molting cycle in relation to the ovarian development of M japonicus in Tokyo Bay In particular the study was done to reveal molting and spawning relationship, to predict reproductive peaks and thus larval recruitment and to investigate the possibility of multiple spawning within one molt cycle in natural condition, Ohh: three out of five stages were represented in the samples since the early premalt (A) and ecdysis (E) occured in a very short time. There occured was a co-occurrence between ovarian maturation and molt stage, in which maturing ovaries occurred at B (late postmolt) to D, (earlv premolt) stage, mature ovaries at C (intermold to D; (late premoly, and spent ovaries at D, to D,. Molting and spawning synchronization was observed in kuruma prawn, in which molting fequency was highest prior to and at the end of spawning season. There was a possibility of multiple spawning within single molt cycle in wild kuruma prawn, since there were enough time for spent ovaries to redevelop into mature ones.
OSMOTIC RESPONSE OF TIGER SHRIMP (Penaeus monodon) BROOD STOCK IN VARIOUS MOLTING STAGES Sutrisno Anggoro; Agung Setiarto
JOURNAL OF COASTAL DEVELOPMENT Vol 2, No 1 (1998): Volume 2, Number 1, Year 1998
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

The attempt to optimize shrimp culture production has faced with several problems related to its biotechnical management, which was suspected unable to meet the needs of the cultured species. This is primary because the ecophysiological characteristics of shrimp, particularly those related to the osmoregulation mechanism in connection with their growth, have not been sufficiently understood. The research was aimed at studying the ecophysiological characteristics of tiger shrimp (Penaeus monodon) involved in biotechnical management of shrimp hatchery with special emphasis on the osmotic response and isosmotic medium requirement for adult spawners in various molting stages. The results showed that osmotic responses were closely realted to the salinity of water medium and molting phases. It was also found that the minimum osmotic works of tiger shrimp occurred in isosmotic medium, i.e. 34 – 35 ppt for premolt, 33 – 34 ppt for molt and 30 – 31 ppt for intermolt stages.
THE DEVELOPMENT OF SELECTIVE AND UNSELECTIVE FISHING GEAR OWNED BY FISHERMAN AT THE NORTH COAST OF CENTRAL JAVA Asriyanto .; Agung Setiarto
JOURNAL OF COASTAL DEVELOPMENT Vol 3, No 2 (2000): Volume 3 Number 2 Year 2000
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

Introduction : The Utilization of fisheries resource in Indonesia waters has just achieved about half (56.06%) of the maximum sustainable yield. In the north coast of Central Java, which has a coastal line of about 450 kilometers, 20 types of fishing gear are owned by fishermen. Experiment : Data were collected from Annual Report 1993 – 1997 issued by Central Java Fisheries Agency. Twenty types of fishing gear were classified into 6 groups, i.e. seine nets, purse seine, gillnets and trammel nets, lift nets, lines, and traps. Two of them were categorized as unselective fishing gear, i.e. seine nets and purse seine, whereas the other 4 were classified as selective ones. The number of each group was expressed in means and percentages and the development/changes thereof was presented in percentage. Results and discussion : The number of unselective fishing gears grew rapidly from 1996 to 1997, i.e. seine nets 17.31% and purse seine 12.07%. on the country the number of selective fishing gear increased slightly or even decreased, for example traps (5.98%), line (4.13%), liftnets (-3.21%), and gill nets & trammel nets (-2.45%). The management of fisheries resources should be focused on the enhancement in the number of selective fishing gear and the extension of their fishing ground, combined with close monitoring on the mesh size of unselective fishing gear.
Co-Authors Asriyanto . Suradi . Sutrisno Anggoro