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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 488 Documents
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Distribusi Spasial Anemon dan Ikan Anemon di Perairan Kelurahan Malalayang Dua, Manado Aldi Pengan; Ari Berty Rondonuwu; Alex Denny Kambey
Jurnal Ilmiah PLATAX Vol. 1 No. 1 (2012): (Edisi September - Desember 2012)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.1.1.2012.491

Abstract

DISTRIBUSI SPASIAL ANEMON DAN IKAN ANEMON DI PERAIRAN KELURAHAN MALALAYANG 2 MANADO1   Aldi Pengan, Ari B Rondonuwu, Alex D Kambey   ABSTRACT   This study was conducted in front of coastal villages Malalayang 2. Performed data acquisition at the date of September 16 and October 6, 2011. Located at 1o27'42.2" N and 124o47'30.9" E. The results obtained identified seven types of anemones from 35 individuals and six types of anemones from 130 individual fish at depths of 0-15 meters. At a depth of cluster anemones, the depth of the A (0-5 meter) 6 of the 13 individuals, the depth of B (5-10 meters) 4 of the 9 individuals, and the depth of C (10-15 meters) 5 of the 13 individuals. While in the cluster anemones fish depth, the depth of the A (0-5 meters) 4 of the 50 individuals, the depth of B (5-10 meters) 4 of the 32 individuals, and the depth of C (10-15 meter) 6 of the 48 individual. In each type of anemones fish most of anemones occupies more than one type.   Keywords : anemones, anemones fish, depth   ABSTRAK Penelitian ini dilakukan di depan perairan pantai Kelurahan Malalayang 2. Pengambilan data dilakukan pada tanggal 16 september dan 6 oktober 2011. Terletak pada 1o27‘42.2“ LU dan 124o47’30.9” BT. Hasil penelitian diperoleh 7 jenis anemon yang teridentifikasi dari 35 individu dan 6 jenis ikan anemon dari 130 individu pada kedalaman 0-15 meter. Pada kelompok kedalaman anemon, kelompok kedalaman A (0-5 meter) 6 jenis dari 13 individu, kedalaman B (5-10 meter) 4 jenis dari 9 individu, dan kedalaman C (10-15 meter) 5 jenis dari 13 individu. Sedangkan pada kelompok kedalaman Ikan anemon, kelompok kedalaman A (0-5 meter) 4 jenis dari 50 individu, kedalaman B (5-10 meter) 4 jenis dari 32 individu, dan kedalaman C (10-15 meter) 6 jenis dari 48 individu. Pada setiap jenis ikan anemon sebagian besar menempati anemon lebih dari satu jenis.   Kata kunci : anemon, ikan anemon, kedalaman
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  
The Growth of Hard Coral (Acropora sp.) Transplants in Coral Reef of Malalayang Waters, North Sulawesi, Indonesia Alex D. Kambey
Jurnal Ilmiah PLATAX Vol. 1 No. 4 (2013): Edisi September - Desember 2013
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.1.4.2013.3703

Abstract

Main coral reef building components, Scleractinian corals, has the highest distribution in Indonesia, at least 590 species known of 793 species in the world. Studies on damaged coral community transplantation have been done to observe their growth and adaptation ability. A four-month observation found that average length increment at 9 M deep was linearly 0.375 cm, 0.632 cm, and 0.732 cm at the first, second, and third month, respectively, at 6 M deep, it was 0.455 cm, 0.689 cm, and 1.012 cm, at the first, second and third month, respectively, and at  3 M deep, it was 0.55 cm, 1.05 cm and 1.1, at the first, second, and thrid month, respectively. Mean relative length increment at 9 M deep occurred every month as much as 4.25%, 8.23%, and 9.86% at the first, second, and third month, respectively. Similarly, it occurred in 6 M deep, 4.12%, 9.14%, and 11.28% at the first, second, and third month, respectively. However, at 3 M deep, it occurred only at the first and second month, 7.33% and 12.73%, while it declined at the third month, 11.7%. Keywords : Ecosystems, Coral Reef, Scleractinia, Malalayang, Manado
The Inventory and Composition Studies of Seagrass in Ratatotok Waters, District of Ratatotok, Southeast Minahasa Regency Frani Mare; Ferdinand F. Tilaar; Laurentius Th. X. Lalamentik
Jurnal Ilmiah PLATAX Vol. 7 No. 1 (2019): ISSUE JANUARY-JUNE 2019
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.7.1.2019.22592

Abstract

This research was carried out in the coastal waters of Ratatotok Village with the purpose of: 1. Knowing the condition of  aquatic environment at research location. 2. Identify seagrass species from Ratatotok waters. 3. To determine the composition of seagrass species which included: Species Density, Relative Density, Abundance, Relative Abundance, Domination, Relative Domination, Frequency, Relative Frequency and Important Values. 7 species from of 2 families  were found in this research  i.e. Cymodoceaceae (Cymodocea rotundata, Cymodocea serrulata, Syringodium isoetifolium, and Halodule uninervis) and Hydrocharitaceae (Enhalus acoroides, Halophila ovalis and Thalassia hemprichii). The number of seagrass stands in the research were ranged from 26-2699 individuals. Species density were found to range from to 9.51 to 987.06 / m².  Relative density were varied from 0.72 to 75.08%. Frequency of occurence were also varied from to 0.69 to 8.46. Relative frequency were ranged  from to 2,68-33.04%. Abundance were found to range from to 10.08-1046.88. Relative abundance were varied  from 0.72-75.08%. The dominance were range from to 28.89-2998.89 and relative dominance from to 0.72-75.08%. The important value of seagrass in the Ratatotok waters showed that Syringodium isoetifolium had important value reaching to 183.20 %. important values of Cymodocea rotundata and Thalassia hemprichii were 41.93 % and 26.68 % respectively .In addition,  these two species were  consisted of  relatively large individual size compared to other species.Keywords : Ratatotok, Seagrass, Important ValuesABSTRAKPenelitian ini dilakukan di Perairan Pantai Desa Ratatotok dengan tujuan untuk: 1. Mengetahui kondisi lingkungan perairan pada lokasi penelitian. 2.  Mengidentifikasi spesies lamun di Desa Ratatotok. 3. Mengetahui komposisi spesies lamun yang meliputi: Kepadatan Spesies, Kepadatan Relatif, Kelimpahan, Kelimpahan Relatif, Dominasi, Dominasi Relatif, Frekuensi, Frekuensi Relatif dan Nilai Penting. Spesies lamun yang ditemukan di lokasi penelitian berjumlah 7 spesies dari 2  family: Cymodoceaceae (Cymodocea rotundata, Cymodocea serrulata, Syringodium isoetifolium, dan Halodule uninervis) dan Hydrocharitaceae (Enhalus acoroides, Halophila ovalis dan Thalassia hemprichii). Jumlah tegakan spesies lamun di lokasi penelitian berkisar antara 26-2699 individu, kepadatan spesies 9,51-987,06/m², kepadatan relatif 0,72-75,08 %, frekuensi kehadiran 0,69-8,46, frekuensi relatif 2,68-33,04 %, kelimpahan 10,08-1046,88, kelimpahan relatif 0,72-75,08 %, dominasi 28,89-2998,89 dan dominasi relatif 0,72-75,08 %. Nilai penting lamun di perairan Desa Ratatotok menunjukkan bahwa jenis Syringodium isoetifolium memiliki nilai penting yang mencapai 183,20 %. Untuk jenis Cymodocea rotundata dan jenis Thalassia hemprichii masing-masing memiliki nilai penting yakni  41,93 % dan 26,68 %. Selain itu jumlah indvidu kedua spesies ini banyak ditemui disertai dengan ukuran individu yang relatif besar dibandingkan spesies lainnya.Kata Kunci : Ratatotok, Lamun, Nilai Penting
Effectiveness of rearing Sandfish, Holothuria scabra and Seaweed, Gracilaria sp. with the Polyculture System Pitjont Tomatala; Petrus P. Letsoin; Evangelin M.Y. Kadmaer
Jurnal Ilmiah PLATAX Vol. 7 No. 1 (2019): ISSUE JANUARY-JUNE 2019
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.7.1.2019.23373

Abstract

Sandfish (Holothurai scabra) and seaweed Gracilaria sp are marine commodities that have economic value and have good prospects in the market. These two commodities, if rearing together, will certainly provide added value to farmers. This research aims to determine the potential of sea cucumber polyculture, (H. scabra) and Gracilaria sp. which is maintained in culture. This research was conducted in April - May 2018 in the coastal of Rat village, Southeast Maluku Regency. Sea cucumbers are weighed and stocked on Pen-culture (measuring 4 x 3 meters) with a density of 40 individuals / Pen-culture. Gracilaria seeds are taken from young thallus which are tied into one clump and ditagging. After that, Gracilaria was weighed and spread in Pen-culture of 20 clump / Pen-culture. Observation of growth and survival of sandfish and Gracilaria sp done once a week. At the same time, predator control is carried out on pen-culture and water quality measurements. The results showed that sea cucumbers experienced absolute growth and survival rates of 18.20 g and 92.5% respectively. Gracilaria sp which is maintained does not experience growth, while the percentage of survival of Gracilaria sp is 20%. Based on the results of the research it can be concluded that Polyculture of sandfish, H. scaba and seaweed, Gracilria sp is not effective if Gracilria sp is stocked on the basis of Pen-culture.Keyword : Sandfish, Gracilaria, PolycultureABSTRAKTeripang pasir (Holothurai scabra) dan rumput laut Gracilaria sp merupakan komuditi laut yang bernilai ekonomis dan mempunyai prospek yang baik dipasaran. Kedua komuditi ini, jika dipelihara bersama tentunya akan memberikan nilai tambah bagi pembudidaya. Penelitian ini bertujuan untuk mengetahui potensi polikultur teripang pasir, (H. scabra) dan Gracilaria sp. yang dipelihara pada pen-culture.Penelitian ini dilaksanakan pada bulan April – Mei 2018 di perairan desa Rat, Kabupaten Maluku Tenggara. Teripang pasir ditimbang dan ditebar pada Pen-culture berukuran 4 x 3 meter dengan kepadatan 40 individu/Pen-culture. Bibit Gracilaria diambil dari thallus muda yang diikat menjadi satu rumpun dan ditagging. Setelah itu, Gracilaria ditimbang dan ditebar pada Pen-culture sebanyak 20 rumpun/ Pen-culture.Pengamatan pertumbuhan dan kelangsungan hidup teripang pasir dan Gracilaria sp. dilakukan  seminggu sekali. Pada waktu yang bersamaan, dilakukan juga pengontrolan predator pada Pen-culture dan pengukuran kualitas air. Hasil penelitian diketahui bahwa teripang mengalami rata-rata pertumbuhan mutlak dan kelangsungan hidup, masing-masing sebesar 18.20 g dan 92.5 %. Gracilaria sp yang dipelihara tidak mengalami pertumbuhan, sedangkan presentase kelangungan hidup Gracilaria sp sebesar 20 %. Berdasarkan hasil penelitian dapat disimpulkan bahwa Polikultur teripang pasir, H. scaba dan rumput laut, Gracilria sp tidak efektif jika Gracilria sp ditebar pada dasar Pen-culture. Kata kunci : Teripang pasir, Gracilaria, Polikultur
Community Structure of Seagrass Tasik Ria Waters, Sub-district of Tombariri, Minahasa District Berlian Rombetasik; Laurentius Th. X. Lalamentik; Ferdinand Frans Tilaar
Jurnal Ilmiah PLATAX Vol. 8 No. 1 (2020): ISSUE JANUARY-JUNE 2020
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.8.1.2020.27603

Abstract

Seagrass study has been conducted in Tasik Ria waters in the district of the Minahasa area. The aims research is: 1. to know the physical and chemical conditions at the waters.2. To identify seagrass species found on research location and to study the community structure of seagrass. Four seagrass species have been found in the study i.e. Halophila ovalis, Enhalus acoroides,  Thalassia hemprichii, dan Syringodium isoetifilium. The number of individuals of seagrass varied between 316 to 662, species densities were varied between (84.27-176.53/m²), relative densities were (16.06-33.62), index of occurrence were (0.1-0.4), the relative frequency was (10-41.66%), the dominance was (84.27-176.5), the relative dominance were (16.04-33.62%). Thalassia hemprichii has the highest on important value has Index of dominance was 0.265, while the diversity index was 1.354, and the distribution pattern was 1.028.Keywords: Seagrass, Identification, Community Structure, Tasik Ria   AbstrakSuatu penelitian mengenai lamun telah dilakukan di Perairan Tasik Ria, Kecamatan Tombariri, Kabupaten Minahasa. Penelitian ini mencakup Struktur Komunitas Lamun di lokasi penelitian. Tujuan penelitian ini adalah 1.Mengetahui kondisi fisik dan kimia perairan 2.Mengidentifikasi spesies lamun yang ada di Perairan Tasik Ria serta mempelajari struktur komunitas lamun.Pada lokasi penelitian ditemukan 4 spesies Lamun,yaitu Halophila ovalis( R. Brown) Hooker F, Enhalus acoroides (Linnaeus f.) Royle, 1839, Thalassia hemprichii (Ehrenberg) Ascherson, dan Syringodium isoetifolium (Ascherson) Dandy. Jumlah tegakan speseis lamun di lokasi penelitian berkisar dari 316 hingga 662 individu, kepadatan spesies (84.27-176.53/m²), kepadatan relatif (16.05-33.62%), frekuensi kehadiran (0.1-0.41), frekuensi relatif (10-41.66%), dominasi (84.27-176.53), dominasi relatif (16.04-33.62%). indeks nilai penting lamun di Perairan Tasik Ria menunjukkan bahwa Thalassia hemprichii memiliki indeks nilai penting paling tinggi di antara ke 4 spesies lamun yakni 108.91%. Indeks dominasi (0.265), indeks keanekaragaman (1.354), pola distribusi (1.028).Kata Kunci : Lamun, Identifikasi, Struktur Komunitas, Tasik Ria
Seasonal Variations of Temperature, Salinity and Turbidity of the Lembeh Strait’s waters, North Sulawesi Simon I. Patty; Rikardo Huwae; Ferdimon Kainama
Jurnal Ilmiah PLATAX Vol. 8 No. 1 (2020): ISSUE JANUARY-JUNE 2020
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.8.1.2020.28293

Abstract

Research on seasonal variations of temperature, salinity and turbidity of the Lembeh Strait’s waters were carried out in March 2016 to February 2017. Observations of temperature, salinity and turbidity were conducted using the Sonde EXO-2 multi parameter tool. The purpose of this study was to determine the seasonal effect on temperature, salinity and turbidity Lembeh Strait’s water. The results of the statistical analysis using ANOVA and Tuckey's test showed that the season affected the salinity and temperature, whereas no significant effect were observed on turbidity. Variations in temperature, salinity and turbidity are affected by external factors such as weather, wind and seasonal current patterns occurred in these waters. The conditions of temperature, salinity and turbidity of sea water in Lembeh Strait are still adequate for marine life.Keywords: temperature, salinity, turbidity, oceanography, Lembeh Strait
Size Structure, Growth Pattern, And Condition Factor Of Red Lolosi Fish (Caesio chrysozona, Cuvier, 1830) From The Bay Of Ratatotok Subdistrict, Southeast Minahasa Tenggara District Rully Firmalinda Gobel; Jan W. S. F. Tamanampo; Rose O. S. E Mantiri
Jurnal Ilmiah PLATAX Vol. 5 No. 2 (2017): ISSUE JULY - DECEMBER 2017
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.5.2.2017.15908

Abstract

The research was conducted in December 2016 in Totok Bay, Ratatotok Subdistrict, with the aim to know the size structure, growth pattern and condition factor of red lolosi fish (Caesio chrysozona). It is expected that this research can provide basic information to monitor the presence of these fish in the future, especially in the territorial waters of Ratatotok. The name of red lolosi fish is a local name in North Sulawesi. Fish with the scientific name Caesio chrysozona is commonly found around the coral reefs and shallow rocky coastal waters. Data were collected in the field by taking a random sample of fish from the catch of fishermen who are still in a fishing boat. The number of fish samples taken to be analyzed were 66. Based on the measurement of 66 individuals of red lolosi, the structure size is as follows: male (51 head) with total length of 180 mm - 259 mm, length of fork 153 mm - 216 mm, and raw length 135mm - 200 mm. While body weight ranges from 71.38 gr - 217.18 grams and females (15 fish) with a total length range of 196 mm - 243 mm, fork length of 165 mm - 209 mm, and standard length of 149 mm - 185 mm. While body weight ranges from 110.22 gr - 193.99 gr. The growth pattern of red lolosi fish both male and female is a negative allometric growth pattern (b <3) where the length of fish increase faster than weight gain. The condition factor of each individual male and female varies with the value of the male condition factor ranging from 0.8094 - 1.2547 and females ranged from 0.9668 to 1.0281. Because the value of K ranged 1 then the conclusion is that male and female of red lolosi fish have a less flat shape. This causes the loss of weight of fish due to the influence of food, age, sex and gonad maturity. ABSTRAK Penelitian dilakukan pada bulan Desember 2016 di Teluk Totok Kecamatan Ratatotok, dengan tujuan untuk mengetahui struktur ukuran, pola pertumbuhan dan faktor kondisi dari ikan lolosi merah (Caesio chrysozona).  Ikan lolosi merah adalah nama lokal di Sulawesi Utara, dan ditemukan cukup berlimpah di  sekitar terumbu karang dan perairan dangkal yang berbatu-batu di Teluk TotokPengambilan sampel di lapangan  dilakukan dengan metoda sampling yaitu dengan cara mengambil sampel ikan secara acak dari hasil tangkapan nelayan yang masih berada dalam perahu nelayan.  Jumlah sampel ikan yang diambil untuk dianalisis sebanyak  66 ekor. Berdasarkan hasil penelitian terhadap 66 individu lolosi merah, diperoleh struktur ukuran sebagai berikut: jantan (51 ekor) dengan kisaran panjang total 180 mm - 259 mm,.  Sedangkan berat tubuh berkisar dari 71.38 gr – 217.18 gr,  dan betina (15 ekor) dengan kisaran panjang total 196 mm - 243 mm, Sedangkan berat tubuh berkisar dari 110.22 gr – 193.99 gr.  Pola pertumbuhan ikan lolosi merah baik jantan maupun betina adalah pola pertumbuhan allometrik negatif ( b < 3)  dimana pertambahan panjang ikan lebih cepat dari  pertambahan beratnya. Faktor kondisi setiap individu jantan dan betina bervariasi dengan nilai faktor kondisi jantan  berkisar 0.8094 - 1.2547 dan Betina berkisar 0.9668 - 1.0281.
Species Inventory and Weight Measurements of Biofoulings Attached on the Pearl Oyster, Pinctada margaritifera, from Arakan Waters, North Sulawesi Putri T. J. Toreh; N. Gustaf F. Mamangkey; Farnis B. Boneka; Janny D. Kussen; Frans Lumuindong
Jurnal Ilmiah PLATAX Vol. 6 No. 2 (2018): ISSUE JULY-DECEMBER 2018
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.6.2.2018.20651

Abstract

This study was conducted with the aims to identify biofoulings living on the shell of the pearl oyster, Pinctada margaritifera and to analyse the weights of the biofoulings for three months. The study was conducted in Arakan waters, District of South Minahasa, North Sulawesi. Biofoulings were collected from the oysters after weighing the shells before and after cleaning. The difference of the weights before and after cleaning was become the weight of the biofoulings. The biofoulings were identified and and analysed. There were eight species of biofoulings recorded and described. Weight results were 3.4 g in the first month, 1.7 g in the second month and 1.1 g on the thord month, respectively.                                                                Keywords: Biofouling, pearl oyster, Pinctada magaritifera Penelitian ini dilakukan dengan tujuan untuk mengidentifikasi biota pengotor yang menempel pada cangkang kerang mutiara Pinctada margaritifera dan mengetahui berat  biota pengotor yang disampling setiap bulan selama tiga bulan perkembangan.  Penelitian ini dilakukan di perairan Desa Arakan, Minahasa Selatan, Sulawesi Utara.  Biota pengotor diambil dari cangkang kerang mutiara Pinctada margaritifera kemudian diidentifikasi. Biota pengotor yang didapat dianalisis dengan cara mengukur selisih berat kerang ditimbang sebelum dibersihkan dan sesudah dibersihkan pada tiga bulan perkembangannya untuk mendapatkan hasil rata-rata berat biota pengotor yang diambil setiap bulan selama tiga bulan perkembangan.  Penelitian ini memperoleh delapan spesies biota pengotor yang menempel pada cangkang kerang Pinctada margaritifera. Hasil pengukuran rata-rata berat biota pengotor yang diambil setiap bulan selama tiga bulan perkembangan yaitu 3,4 gr (bulan pertama), 1,7 gr (bulan kedua) dan 1,1 g (bulan ketiga).  Kata kunci: Biota pengotor, kerang mutiara, Pinctada margaritifera
Predatorism and Cannibalism of Fish Betutu (Oxyeleotris marmorata Blkr.) In Lake Tondano, Minahasa regency, North Sulawesi Rama Presley Kambey; Rose O.S.E. Mantiri; Markus T. Lasut
Jurnal Ilmiah PLATAX Vol. 7 No. 1 (2019): ISSUE JANUARY-JUNE 2019
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.7.1.2019.23217

Abstract

Aims of this study is to determine the ability of marble goby to prey other fish and other marble goby in Tondano Lake. This research was conducted in August 2017 to December 2017. Measure of aquarium used as container is 120 cm x 40 cm x 40 cm which was divided into 2 parts, equipped with a camera in addition to observe the reaction of predation on marble goby. To know the predation behaviour of marble goby, using sample size is <15 cm and> 15 cm, and the prey fish is used was silver barb (Puntius javanicus) size is 10 cm - 20 cm. To determine the cannibal behaviour is used marble goby size is <15 cm and> 20 cm, and prey another marble goby size is 10-20 cm. The results showed the fastest predatorism reaction of marble goby attack silver barb occurred is 6 minutes after treatment, and the fastest cannibalism reaction of marble goby occurred after 45 minutes.Keywords: Betutu, Lake Tondano, Cannibalism, Predation, Predatorism. ABSTRAKPenelitian ini bertujuan untuk mengetahui kemampuan ikan betutu dalam memangsa ikan lain dan sesama ikan betutu di Danau Tondano. Waktu penelitian dilakukan pada bulan Agustus 2017 sampai Desember 2017. Wadah yang digunakan adalah akuarium berukuran 120 cm x 40 cm x 40 cm yang dibagi menjadi 2 bagian dengan menggunakan sekat, dilengkapi dengan kamera untuk mengamati reaksi pemangsaan ikan betutu. Untuk mengetahui sifat predator ikan betutu digunakan sampel berukuran <15 cm dan >15 cm, dan mangsa yang digunakan adalah ikan tawes (Puntius javanicus) yang berukuran 10 cm - 20 cm. Untuk mengetahui sifat kanibal ikan betutu digunakan ikan betutu berukuran <15 cm dan >20 cm, dan mangsa ikan betutu berukuran 10-20 cm. Hasil penelitian menunjukkan reaksi tercepat predatorisme ikan betutu terhadap ikan tawes terjadi setelah 6 menit setelah perlakuan, dan reaksi tercepat kanibalisme ikan betutu terjadi setelah 45 menit.Kata kunci: Betutu, Danau Tondano, Kanibalisme, Pemangsaan, Predatorisme

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