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All Journal JURNAL ILMIAH PLATAX JURNAL PERIKANAN DAN KELAUTAN TROPIS
Anneke V. Lohoo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Environmental Science

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Community Structure of Macroalgae in the Coastal Waters of Bahowo Tamara, Giovanni Matthew A. J.; Kepel, Rene Charles; Lumingas, Lawrence J. L.; Wantasen, Adnan S.; Lasabuda, Ridwan; Lohoo, Anneke V.
Jurnal Ilmiah PLATAX Vol. 13 No. 2 (2025): ISSUE JULY-DECEMBER 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i2.61576

Abstract

This research aims to describe the morphology and anatomy of each species from the research location and to analyze the community structure of macroalgae from the research location. Data collection was done using the Line Transect method with a quadrat sampling technique during the lowest tide. Temperature and salinity checks were measured using a thermometer and refractometer. Substrate determination was done visually based on the type of substrate. The results of this study found 9 species, consisting of 4 red algae species (Rhodophyceae) and 5 green algae species (Ulvophyceae). The morphology of these algae species varies, with different anatomy based on transverse and longitudinal sections of each part of the alga's thallus. The highest species density was H. edulis, while the lowest densities were A. fragilissima, D. versluysii, T. fragilis, and C. racemosa. The macroalgae diversity index values in the three transects are in the medium category, the species evenness index values are stable, the species richness index values are in the low category, and the dominance index values are in the low category. Keywords: Macroalgae, Community, Transect, Quadrat, Bahowo.   Abstrak Tujuan penelitian ini adalah mendeskripsikan morfologi dan anatomi masing-masing spesies dari lokasi penelitian, dan menganalisis struktur komunitas makroalga dari lokasi penelitian. Pengambilan data menggunakan metode Line Transect dengan teknik sampling kuadrat yang dilakukan pada saat surut terendah. Pengecekan suhu dan salinitas diukur dengan menggunakan termometer dan refractometer. Untuk penentuan substrat dilihat secara visual terhadap jenis dari substrat tersebut. Hasil penelitian ini ditemukan 9 spesies yang terdiri dari 4 spesies alga merah (Rhodophyceae), dan 5 spesies alga hijau (Ulvophyceae). Morfologi jenis-jenis alga tersebut beragam dengan anatomi yang berbeda berdasarkan potongan melintang dan memanjang dari masing-masing bagian thallus alga. Kepadatan spesies tertinggi yaitu H. edulis sedangkan kepadatan terendah yaitu A. fragilissima, D. versluysii, T. fragilis, dan C. racemosa. Nilai indeks keanekaragaman makroalga pada ketiga transek termasuk dalam kategori sedang, nilai indeks kemerataan jenis dalam keadaan stabil, nilai indeks kekayaan jenis dalam kategori rendah dan nilai indeks dominasi dalam kategori rendah. Kata kunci: Makroalga, Komunitas, Transek, Kuadrat, Bawoho
The length-weight relationship of the bigeye scad (Selar crumenophthalmus) captured by purseseiner from FMA 716 of North Sulawesi seawaters: A comparative study of the target species sizes on May and August 2022 Sitanggang, Effendi P.; Budiman, Johnny; Sitanggang, Dyan F. D.; Lohoo, Anneke V.; Kalalo, Flora P.
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.66508

Abstract

Bigeye scad (Selar crumenophthalmus Bloch 1793) is rich source of proteins, Omega-3 fatty acids, and various important vitamins and minerals for human body, that makes the fish has an important economic value. Additionally, because of forming an important shoal on coastal seawaters, the fish is frequently captured, notably by purseseiners in an important quantity from the FMA 716 of North Sulawesi seawaters. The intensiveness captures of the fish may affect the sustainability and continuity life of the species. The research aims at analyzing some biological reproduction aspects of species based on gender and fishing season. The 400 samples, 200 tails on May and 200 tails on August 2022, have selected by a purposive random sampling from the captures. Data analisys refers to some common formulas, such as the length and weight size structure, sex and weight ratio, W-L relationship (W = aLb, W = weight, g), L = length (cmFL), a and b constants, condition factor (K), length at first capture (Lc50%). The legal size is determined by comparing the length at first capture (Lc50%) observed and at first maturity (Lm50%) reference. On May, the sample weight is 33,439 g (51.8% of 400 samples), the sex and weight ratios are 1:1.08 and 1:1.36 respectively with the conversion factor (cf) of 1.26. The average length and weight sizes are 21.62 ± 0.17 cm and 167.20 ± 5.15 g respectively, where the average weight per 1 cmFL is 7.67 ± 0.18 g. The L-W relationship follows W = 0.1492 L 3.0785 (r = 0.86) for male, W = 0.0566 L 3.8088 (r = 0.90) for female, and W = 0.0864 L 3.4940 (r = 0.91) for all, with K average of 1.60 ± 0.02 for male, 1.66 ± 0.03 for female, and 1.63 ± 0.02 for 200 samples. On August, the sample weight is 31,115 g (48.2% of 400 samples), the sex and weight ratios are 1:1.50 and 1:1.82 respectively, with cf of 1.21. The average length and weight sizes are 21.49 ± 0.16 cm and 155.58 ± 4.71 g respectively, where the average weight per 1 cmFL is 7.19 ± 0.17 g. The L-W relationship follows W = 0.1515 L 3.047 (r = 0.88) for male, W = 0.0789 L 3.5485 (r = 0.88) for female, and W = 0.0836 L 3.5023 (r = 0.90) for all samples, with K average of 1.50 ± 0.02 for male, 1.58 ± 0.03for female, and K of 1.55 ± 0.02 for 200 samples. On both fishing seasons, all captures are categorized a positive allometry (b>3) and 96.75% of captures has a legal size. All females have passed their first maturity stage. For this reason, the fishermen must consider carefully when they catch the fishes, outside of the two months. Considering the intensiveness of fishing activities to such species, it is indispensable since early for all stakeholders designing a regulation to limitate captutes by gender size and fishing seasons, for all species of high potential and economic value of high density of shoals. Key words: bigeye scad, biological reproduction aspects, FMA 716, North Sulawesi, fish conservationn
Co-Authors Adnan Wantasen Alex D. Kambey Alinaung F. Firgonitha Alvira Y. Bulahari Ari B. Rondonuwu Bataragoa, M.Sc, Dr. Ir. Nego E. Bataragoa, Nego Bilaleya, Iman Dauhan, Dulce Maria Effendi P. Sitanggang Flora Pricilla Kalalo Fransine B. Manginsela Frengky Hartanto, Frengky Gaspar Manu Grace Mustamu Janny D. Kusen John L. Tombokan Johnny Budiman Karundeng, Christian Kepel, Rene Ch. Kondoy, Khristin F I. Lalita, Jans Laura, Azhar Lawrence J. L Lumingas Lawrence J. L. Lumingas Lumingas, Lawrence Lumingas, Lawrence J. M.Si, Fransine B. Mandagi, Stephanus Mandagi, Stephanus V. Manginsela, Fransine Mantiri, Nicola R. K. Mantiri, Rose O.S.E. Muhammad S. Hasi Nego E. Bataragoa Nego E. Bataragoa, Nego E. Nuske Kamurahan Ockstan Kalesaran Pongajouw, Oxha Putra Rafii, Keken Angliyana Rangan, Jety K. Rene Charles Kepel, Rene Charles Ridwan Lasabuda Rivany Turang Rose O. S. E. Mantiri, Rose O. S. E. Rustandi, Yogi Salaki, Meiske S. Sangari, Joudy R. R. Silvester B Pratasik Sinjal, Henky Sitanggang, Dyan F. D. Syanet C.S Umboh Tamara, Giovanni Matthew A. J. Tilaar, Ferdinand F. Unstain N. W. J. Rembet Victor N. R. Watung