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All Journal AQUATIC SCIENCE & MANAGEMENT JURNAL PESISIR DAN LAUT TROPIS JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS
Khristin I. F. Kondoy, Khristin I. F.
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Environmental Science

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Length-weight Relationship and Reproduction of Halfbeak Hemiramphus lutkei Valenciennes, 1847 In The Waters Around Nain Island, North Minahasa Regency Umasangadji, Muhammad Hasril; Bataragoa, Nego E.; Kondoy, Khristin I. F.; Lumingas, Lawrens .J. L .; Mantiri, Rose. O.S.E; Lumoindong, Frans
Jurnal Ilmiah Platax Vol. 11 No. 1 (2023): ISSUE JANUARY-JUNE 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i1.44031

Abstract

Abstract The waters around Nain Island have quite a lot of biological resources. One of the resources in these waters is the halfbeak Hemiramphus lutkei. This study aims to determine the relationship between length-weight and reproduction of the halfbeak Hemiramphus lutkei. The length-weight relationship, growth patterns and condition factors. Reproduction includes sex ratio, gonadal maturity level, gonadal maturity index and fecundity. Fish sampling were taken from the catches of fishermen. The number of samples required is 200, the samples are taken twice in two months from June-July. The length-weight relationship of male was W= 0.1705L1.8204 negative allometric growth pattern and female fish W = 0.0572L2.1962 negative allometric growth pattern. The condition factor of male and female where 0.98 ± 0.06 and 1.03 ± 0.07 respectively. The sex ratio of male and female (1: 0.835). The gonad maturity level of male (immature, developing, mature, ripe and spent) was found in June and female (immature, developing, mature, ripe and spent) found in June and July. The fecundity of ranged from 923 – 3,578 eggs with an average of 1,899 ± 666. Keywords: Length-weight, growth patterns, gonad, fekundity ABSTRAK Perairan Sekitar Pulau Nain ialah perairan yang memiliki cukup banyak sumberdaya hayatinya. Salah satu sumberdaya yang berada di perairan tersebut yaitu, ikan julungjulung Hemiramphus lutkei. Penelitian ini bertujuan untuk mengetahui hubungan panjang-berat dan reproduksi ikan julungjulung Hemiramphus lutkei. Hubungan panjang-berat meliputi pola pertumbuhan dan faktor kondisi. Reproduksi meliputi rasio kelamin, tingkat kematangan gonad, indeks kematangan gonad dan fekunditas. Lokasi pengambilan sampel ikan diambil di perairan sekitar Pulau Nain dan sampel diambil dari hasil tangkapan nelayan. Jumlah sampel yang diperlukan sebanyak 200 ekor, sampel diambil sebanyak dua kali dalam dua bulan dari Juni-Juli. Hubungan panjang-berat ikan julungjulung jantan yaitu W= 0,1705L1,8204 pola pertumbuhan allometrik negatif. Ikan julungjulung betina W = 0,0572L2,1962 pola pertumbuhan allometrik negatif. Faktor kondisi ikan julungjulung jantan dan betina bernilai 0,98 ± 0,06 dan 1,03 ± 0,07. Rasio kelamin ikan julungjulung jantan dan betina (1:0,835). Tingkat kematangan gonad ikan julungjulung jantan (I, II, III, IV dan V) ditemukan pada setiap bulan Juni. Tingkat kematangan gonad ikan julungjulung betina (I, II, III, IV dan V) ditemukan pada setiap sampel pada bulan Juni maupun Juli. Fekunditas ikan julungjulung berkisar antara 923 – 3.578 butir dengan rata-rata 1.899 ± 666. Kata Kunci: Panjang-berat, pola pertumbuhan, gonad, fekunditas
Gastropod community structure on seagrass beds in Bahoi Village, North Minahasa Tualangi, Jehezkiel Timotius; Rangan, Jety K.; Sangari, Joudy R. R.; Rondonuwu, Ari B.; Manu, Gaspar D.; Kondoy, Khristin I. F.
Jurnal Ilmiah Platax Vol. 11 No. 2 (2023): ISSUE JULY-DECEMBER 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i2.48307

Abstract

The village of Bahoi has a vast expanse of seagrass meadows of approximately 16.50 Ha, located between mangrove and coral reef ecosystems. This study aims to inventory the gastropod species in the seagrass meadow of Bahoi village waters and to determine the gastropod community structure through analysis of species density, relative density, species diversity index, and dominance index. The method used was a transect line method along 50 meters and a 1x1m quadrat pulled towards the sea, repeated three times during low tide. A total of 117 individuals were found, belonging to 26 species (11 families and 17 genera) of gastropods in the seagrass meadow of Bahoi village coastal waters. Based on the results, the highest density value was 1.10 ind/m2 with a relative density of 28.20%. Based on the analysis, the dominance index (D) of gastropods in the seagrass meadow of Bahoi village coastal waters was low, with values of D = 0.019 to 0.041, indicating that there was no specific species dominance in the seagrass meadow of Bahoi village coastal waters. This has an effect on the diversity index with a value of H' = 2.51, which is categorized as moderate. These results show that the diversity of gastropod species in the seagrass meadow of Bahoi village waters is quite diverse due to the absence of specific gastropod species dominance. Keywords: Bahoi, Seagrass Meadow, Gastropods, Community Structure. Abstrak Desa Bahoi memiliki luas hamparan padang lamun ± 16.50 Ha yang berada di antara ekosistem mangrove dan ekosistem terumbu karang. Penelitian ini bertujuan untuk melakukan inventarisasi jenis-jenis gastropoda di hamparan lamun perairan Desa Bahoi, dan mengetahui struktur komunitas gastropoda melalui analisis kepadatan spesies, kepadatan relatif, indeks keanekaragaman spesies, dan indeks dominasi. Metode yang digunakan adalah metode transek garis sepanjang 50 meter dan kuadrat berukuran 1×1m yang ditarik ke arah laut, dan dilakukan ulangan sebanyak 3 kali pada saat air surut.Ditemukan 117 individu yang termasuk ke dalam 26 spesies (11 famili dan 17 genera) gastropoda di hamparan padang lamun perairan pantai desa Bahoi. Berdasarkan hasil penelitian, nilai kepadatan tertinggi sebesar 1,10 ind/m2 dengan kepadatan relatif 28,20%. Berdasarkan hasil analisis, Indeks Dominansi (D) gastropoda di hamparan lamun perairan pantai desa Bahoi tergolong rendah, dengan nilai D=0,019 sampai dengan 0,041 menunjukkan bahwa tidak terdapat dominasi spesies tertentu di hamparan padang lamun perairan pantai desa Bahoi. Hal ini berpengaruh terhadap Indeks Keanekaragaman dengan nilai H’=2,51 sehingga berada pada kategori sedang. Hasil tersebut menunjukkan bahwa keanekaragaman jenis gastropoda di hamparan lamun perairan pantai desa Bahoi cukup beragam dikarenakan tidak adanya dominasi spesies gastropoda tertentu. Kata kunci: Bahoi, Padang Lamun, Gastropoda, Struktur Komunitas
Seagrass Community Structure in Mangket Beach Water, Kema District, North Minahasa Regency Wakkary, Paramitha G.; Mandagi, Stephanus V.; Kondoy, Khristin I. F.; Kepel, Rene Ch.; Menajang, Febry S. I.; Rangan, Jety
Jurnal Ilmiah Platax Vol. 12 No. 1 (2024): ISSUE JANUARY-JUNE 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i1.50365

Abstract

The purpose of this study was to determine the types of seagrasses, density, relative density, frequency, diversity index, dominance index, and environmental factors in Mangket coastal waters. This research method is the quadratic and line transect. This research was conducted in the waters of Mangket Beach, Kema District, North Minahasa Regency on November 27, 2022. There were 3 species of seagrass found in Mangket Beach waters, namely, Cymodocea rotundata, Cymodocea serrullata, and Enhalus acoroides. The number of seagrass species stands at the study site ranged from 105-814 individuals, species density (4.38-33.92 individuals/m2), relative density (6.54-50.72%), frequency of presence (1.67-4 .00), relative frequency (17.24-41.38%), diversity index H'= (0.38) and dominance index (0.004-0.26). The environmental conditions in the waters are temperature 29.5°C, salinity 32‰, and sandy and sandy mud substrates. Keywords: Mangket Beach, seagrasses, community structures. Abstrak Tujuan penelitian ini adalah untuk mengetahui Struktur Komunitas Lamun meliputi jenis-jenis lamun, kepadatan, kepadatan relatif, frekuensi, frekuensi relatif, indeks keanekaragaman, indeks dominasi dan faktor lingkungan perairan pantai Mangket. Metode penelitian ini adalah kuadrat dan line transek. Penelitian ini dilaksanakan di perairan Pantai Mangket Kecamatan Kema Kabupaten Minahasa Utara pada tanggal 27 November 2022. Spesies lamun yang ditemukan di perairan Pantai Mangket berjumlah 3 yaitu, Cymodocea rotundata, Cymodocea serrullata dan Enhalus acoroides. Jumlah tegakan spesies lamun di lokasi penelitian berkisar dari 105-814 individu, kepadatan spesies (4,38-33,92 individu/m2), kepadatan relatif (6,54-50,72%), frekuensi kehadiran (1,67-4,00), frekuensi relatif (17,24-41,38%), indeks keanekaragaman H’= (0,38) dan indeks dominasi (0,004-0,26). Kondisi lingkungan di perairan yakni suhu 29,5°C, salinitas 32‰, substrat lumpur berpasir dan berpasir. Kata Kunci: Pantai Mangket, lamun, struktur komunitas.
Co-Authors Adnan S. Wantasen Adnan Wantasen Alelo, Meske Leny Alex D. Kambey Ari B. Rondonuwu Arsida N.A. Kamaludin Billy Th. Wagey Billy Theodorus Wagey Calvyn F. A. Sondak, Calvyn F. A. Deiske Adeliene Sumilat, Deiske Adeliene Esther D. Angkouw Frans Lumoindong, Frans Gaspar D. Manu, Gaspar D. Grevo S Gerung Hermanto Manengkey Indri Manembu Joudy R.R. Sangari Kepel, Rene Ch. Lawrence J.L. Lumingas, Lawrence J.L. Lumingas, Lawrens .J. L . Mandagi, Stephanus V. Manengkey, Hermanto Mantiri, Rose. O.S.E Manurung, Nia Dopa Medy Ompi Menajang, Febry S. I. Moningkey, Ruddy D. Namoua, Dilivia J. Nego E. Bataragoa, Nego E. Nickson J. Kawung Pansing, Jenita Patra, Frian Pelle, Wilmy Rangan, Jety Rangan, Jety K. Ridwan Lasabuda Rose O. S. E. Mantiri, Rose O. S. E. Sangari, Joudy R. R. Surabi, Astevi Suzanne L Undap Tampanguma, Biondi Tamsir, Chika Litawaty Tualangi, Jehezkiel Timotius Umasangadji, Muhammad Hasril Wakkary, Paramitha G. Yuneke Kansil