Djoko Suprapto
Program Studi Manajemen Sumberdaya Perairan Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

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Journal : ILMU KELAUTAN: Indonesian Journal of Marine Sciences

ANALISA KUALITATIF REPRODUKSI KERANG KIPAS-KIPAS AMUSIUM SP DARI WELERI - KENDAL, JAWA TENGAH Widowati, Ita; Suprijanto, Jusup; Suprapto, Djoko
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 7, No 2 (2002): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (756.541 KB) | DOI: 10.14710/ik.ijms.7.2.127-130

Abstract

Analisa kualitatif reproduksi kerang kipas-kipas Amusium sp dari perairan Weleri-Kendal Jawa Tengah telah dilakukan selama bulan Maret sampai Juni 2001. Data kualitatif didapatkan setiap bulan berdasarkan kriteria tingkat kematangan gonad dan index gonad. Hasil penelitian menunjukkan bahwa pada bulan Maret dan April, gonad dalam keadaan matang (tingkat kematangan gonad VI), dengan indeks gonad 13,86 % dan 13,87 %. Bulan Mei-Juni indeks gonad menurun menjadi 8,49 % dan 3,97 %, dimana diduga berkaitan dengan masa pemijahan.Kata kunci: Amusium sp, indeks gonad, tingkat kematangan gonad   Qualitative analysis of reproductive organ of the scallop Amusium sp from Weleri - Kendal waters was carried from March to June 2001 In Weleri-Kendal (Central Java). Data were compiled monthly based on staging criteria and gonad indices. Scallop were generally ripe by March-April (stage of VI), with gonad index 13.86 % and 13.87 %. From May -June, gonad indices decreased 8.49 % and 3.97 %, it was suggested that it correlated with their spawning periods.Keywords: Amusium sp, gonad indices, gonadal maturity stages.
OSMOREGULATION PATTERN OF FINGERLING VANNAME SHRIMP (LITOPENAEUS VANNAMEI) REARING IN THREE MOLT STAGE ISO-OSMOTIC MEDIA Anggoro, Sutrisno; Suprapto, Djoko; Purwanti, Frida
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 3 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (150.916 KB) | DOI: 10.14710/ik.ijms.23.3.119-122

Abstract

Vanname shrimp (Litopenaeus vannamei) is one of euryhaline Crustacean that able to adapt to a wider range of salinities. The need of suitable media for a given size and molting stage of shrimp is a key factor of the success of shrimp culture. In order to ensure the success of fingerling Vanname shrimp (FVS) rearing, it is indispensable to provide suitable osmotic media for the molting process. This research was aimed to examine and determine isoosmotic media that complies with physiological process of FVS. The research was done in laboratory scale with Completely Randomized Design. FVS was acclimated to three salinities level i.e. 15-16 ? as the postmolt isosmotic media, 25-26 ? as the intermolt isosmotic media, and 29-30 ? as the premolt and molt isosmotic media with three replications. The result showed that in the media of 25-26 ?, the osmotic work revealed the minimal level and it enhanced the growth rate without changing the amino acids composition in the shrimp body tissue.
GROWTH OF MANGROVE CRAB SCYLLA SERRATA THE GIVEN DIFFERENT TYPES OF FEED (PERTUMBUHAN KEPITING BAKAU SCYLLA SERRATA YANG DIBERI BERBAGAI JENIS PAKAN) Suprapto, Djoko; Widowati, Ita; Yudiati, Ervia; Subandiyono, Subandiyono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 4 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (317.19 KB) | DOI: 10.14710/ik.ijms.19.4.202-210

Abstract

Meningkatnya permintaan kepiting untuk ekspor terutama disebabkan kelezatan dan kandungan gizi dagingnya. Namun pada umumnya masih berasal dari hasil tangkapan dari alam, oleh karenanya peningkatan teknologi budidaya sangat penting. Penelitian ini bertujuan untuk mengetahui pengaruh jenis kelamin, jenis pakan dan metode pembesaran terhadap pertumbuhan kepiting.Penelitian dilakukan dengan metode eksperimental, dalam menganalisis pengaruh variable menggunakan rancangan acak kelompok dengan pola faktorial 2x2x3. Laju pertumbuhan mutlak dan pertambahan berat diukur setiap minggu. Hasil penelitian menunjukkan bahwa kepiting jantan dipelihara secara individu dengan pakan ikan mempunyai pertumbuhan mutlak tertinggi yaitu 1,07 g.hari-1 dan pertambahan berat (weight gain) tertinggi pula yaitu 84,73%. Pemeliharaan massal, kepiting betina dengan pakan ikan rucah memiliki laju pertumbuhan mutlak tertinggi yaitu 0,80 g.hari-1. Sedangkan weight gain tertinggi diperoleh pada kepiting jantan yang diberi pakan ikan yaitu 52,03%. Anova tes menunjukkan pengaruh jenis kelamin dan interaksinya berbeda nyata. Hal ini menunjukkan bahwa pertumbuhan kepiting dengan pakan ikan rucah lebih tinggi dibandingkan kepiting dengan pakan kerang dan campuran dari ikan dan kerang. Kepiting jantan yang dipelihara secara individu diberi pakan ikan rucah tumbuh lebih baik dibandingkan kepiting betina. Pertumbuhan Kepiting betina yang dipelihara secara massal dan diberi pakan ikan rucah memiliki peertumbuhan paling tinggi. Kata kunci: pertumbuhan, jenis kelamin, pakan alami, Scylla serrata, wadah pemeliharaan The increase of the export demand of crabs (Scylla serrata), among others caused by the good taste and have a very high nutrition value, but most of the crab still collected by fishing of natural stock. Therefore, technology of crabs culture should be enhanced. This research was aiming to understand the influence of sexual, feeding regime, environmental factors to the growth rate. This research was conducted experimentally using the randomized block design with factorial pattern 2x2x3. The growth rate and weight gain were measured weekly. The results show that male crab reared in individual aquarium fed by mixed fish revealed the quickest ultimate growth rate i.e. 1.07 g.day-1, as well as achieving the highest weight gain i.e. 84.73%. While in mass rearing method, female crab fed by mixed fish achieved the highest ultimate growth rate ie. 0.8 g.day-1, and the highest weight gain achieved in male crab fed by mixed fish i.e. 52.03%. Anova test reveal that sexual factor and it?s interaction was significantly different. The research conclude that the growth of the crab fed by mixed fish was higher than those fed by bivalve meat or combination of mixed fish with bivalve meat; male crab reared individually and fed with mixed fish revealed has higher growth rate then the female crab; and the growth rate of female crab reared in a mass and fed by mixed fish revealed the highest growth rate. Keywords : growth, sexual, natural feed, Scylla serrata, rearing media
NEW TECHNIQUE OF FILTRATION RATE MEASUREMENT IN FLOW THROUGH SYSTEM WITH CONSTANT CONCENTRATION OF ALGAE Suprapto, Djoko
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 7, No 1 (2002): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1193.254 KB) | DOI: 10.14710/ik.ijms.7.1.37-42

Abstract

Sebuah tekhnik baru pengukuran tingkat filtrasi bivalvia telah dirancang dan digunakan untuk mengukur filtrasi dari Pecten maximus L. Prinsip penghitungan teknik pengukuran filtrasi ini adalah menghitung penurunan konsentrasi fitoplankton dalam media pengukuran. Alat ini selanjutnya diuji untuk menghitung konsumsi fitoplankton delam hubungannya dengan berat kering P. maximus L. Hasil pengukuran dinyatakan dalam persamaan alometrik (Y=aXb). Konsumsi fitoplankton untuk populasi Brest, Saint Breiux. Scotlandia dan lrlandia berturut-turut adalah sebagai berikut: 85,17X012, 97,18X0,16, 85,98X0,18 dan 75,70X0,18 Kata kunci: laju filtrasi, scallop, berat kering A flow through system for measuring filtration rate of bivalve is described. The principle of measurement was to calculate the decrease of algal concentration in the water medium where the experimental animal was placed. The measuring system was tested to calculate the phytoplankton consumption related to dry body weight of scallop Pecten maximus L. coming from different populations. This corretetion is expressed by allometric equation (Y=aXb). Allometric equation of Brest, Saint Brieux. Scotland, Ireland populations are: 85,17X012, 97,18X0,16, 85,98X0,18 dan 75,70X0,18 successivelyKeywords: filtration rate, Scallop, dry body weight