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INDONESIA
JURNAL ILMIAH PLATAX
Published by Universitas Sam Ratulangi
ISSN : 23023589     EISSN : -     DOI : -
Core Subject : Social,
Environmental Science
Mencakup Penulisan yang berhubungan dengan pelaksanaan penelitian yang dilakukan secara mandiri, atau kelompok, dan berdasarkan Ruang Lingkup Pengelolaan Wilayah Pesisir, Konservasi, Ekowisata, dan Keanekaragaman Hayati Perairan.
Arjuna Subject : -
Articles 12 Documents
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Search results for , issue "Vol 6, No 1 (2018): ISSUE JANUARY-JUNE 2018" : 12 Documents clear
Phytoplankton Species Diversity in The Manado Bay River's Mouths Indradewa, I Gede Bagus; Mantiri, Rose O.S.E; Tamanampo, Jan F.W.S.
Jurnal Ilmiah PLATAX Vol 6, No 1 (2018): ISSUE JANUARY-JUNE 2018
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.6.1.2018.19539

Abstract

The research was conducted in four rivermouths surrounding city of Manado. The first location is Bahu rivermouth, second location is Sario rivermouth, third location is Jengki rivermouth and the fourth location is Bailang rivermouth. Objectives of this study were to reveal the composition of phytoplankton and its ecological indices in those four rivermouths.Method used was considered as descriptive and explorative study. Plankton net with 60 µm mesh size used for samples collection. The volume of water on the cod end was 50 ml which then  brought into the laboratory for further identification and density calculation.Fourtyfive in total of phytoplankton species identified on those four rivermouths comprise of 23 marine species and 22 freshwater species. The highest density value (5.99 individu/l) was found in Jengki rivermouth while the lowest found in Bahu rivermouth (0.65 individu/l). Those four rivermouths have diversity index ranging from 0.94 to 2.03 that considered high. This index value shows that there is no dominant species recorded in the study areasKeyword: Phytoplankton, Rivermounth, Manado bay AbstrakPenelitian ini dilaksanakan di empat muara sungai yang terdapat pada Kota Manado. Lokasi pertama di muara sungai Bahu, lokasi kedua di muara sungai Sario, lokasi ketiga di muara Sungai Jengki dan lokasi keempat di muara sungai Bailang. Tujuan penelitian yaitu mengetahui jenis-jenis fitoplankton di keempat muara sungai di Kota Manado kawasan Teluk Manado dan mengetahui kepadatan spesies dan indeks ekologis fitoplankton di keempat muara sungai tersebut.            Penelitian ini menggunakan metode deskriptif dan eksploratif. Sampling plankton menggunakan plankton net ukuran 60 µm. Air yang tersaring dan tertampung di cod end  sebanyak 50 ml kemudian diidentifikasi dan dihitung kepadatannya.Diperoleh 45 spesies fitoplankton di empat muara tersebut terbagi atas 23 spesies air laut dan 22 spesies air tawar, dengan kepadatan tertinggi sebesar 5,99 ind/l yang terdapat pada muara Jengki dan kepadatan terendah sebesar 0,65 ind/l terdapat pada muara Bahu. Keempat muara tersebut memiliki indeks keanekaragaman 0,94-2,03 yang berarti memiliki tingkat keanekaragaman yang tinggi. Angka ini juga menunjukan bahwa pada daerah ini tidak ada spesies yang terlalu mendominansi suatu wilayah.Kata kunci: Fitoplankton, Muara sungai, Teluk Manado  
Masculinization By Using Method Of The Immersion And Oral To Genital Change Of Tilapia Oerochromis niloticus Mangaro, Ramlesius; Sinjal, Hengky J.; Monijung, Revol D.
Jurnal Ilmiah PLATAX Vol 6, No 1 (2018): ISSUE JANUARY-JUNE 2018
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.6.1.2018.18908

Abstract

This research activity was conducted at Balai Pembenihan, Pengendalian Hama dan Penyakit Tateli from August -September 2017. The treatment in this study was masculinization by using Immersion Method (P), Oral (O) and Control or without hormone addition (K). In the method of immersion with a dose of 10 mg / L water / 100 larvae in soak for 6 hours. Oral Method with a dose of 15 mg / kg of feed hormone, administration for 14 days. Control is maintenance without treatment. The result of male sex test identification at the end of the experiment was obtained by the percentage of males after the highest treatment was Oral (O) treatment of 92.57%, the immersion treatment (P) of 89.53%, and the last was Control (K) , 73%. The survival rate (SR) of the test fish during the 50 days of trial maintenance was highest in Oral test fish, 61.67% followed by Immersion 53% and 38.67% Control. Keywords : Fish,  Immersionn, Masculinization, Oral, Survival, TilapiaAbstrakPenelitian ini dilakukan di Balai Pembenihan, Pengendalian hama dan Penyakit Tateli dari bulan Agustus – September 2017.  Perlakuan dalam penelitian ini adalah maskulinisasi dengan menggunakan metode Peredaman (P), Oral (O) dan Kontrol atau tanpa penambahan hormon (K). Pada metode Perendaman dengan dosis 10 mg/L air/100 ekor larva di rendam selama 6 jam. Metode Oral dengan dosis hormon 15 mg/Kg pakan, pemberian selama 14 hari. Kontrol adalah pemeliharaan tanpa perlakuan. Hasil identifikasi kelamin jantan ikan uji pada akhir percobaan didapat persentase jantan setelah perlakuan tertinggi adalah perlakuan Oral (O) sebesar 92,57 %, perlakuan Perendaman (P) sebesar 89,53 %, dan yang terakhir adalah Kontrol (K) dengan hasil sebesar 52,73 %. Persentase kelangsungan hidup (SR) ikan uji selama pemeliharaan 50 hari percobaan adalah yang tertinggi terdapat pada ikan uji Oral  yaitu sebesar 61,67%  diikuti dengan Perendaman sebesar 53 % dan Kontrol sebesar 38,67  %.Kata kunci : Ikan, Maskulinisasi, Perendaman, Oral, Kelangsungan Hidup, Nila

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