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SIMBIOSA
Published by Universitas Riau Kepulauan Batam
ISSN : 23019417     EISSN : 25986007     DOI : http://dx.doi.org/10.33373/sim-bio.v9i2.2458
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education
ehadiran jurnal SIMBIOSA sangat diharapkan untuk meningkatkan publikasi ilmiah pada bidang pembelajaran Biologi dan Sains. Fokus dan cakupan SIMBIOSA secara deteil sebagai berikur: Pendidikan Biologi, mencakup : pembelajaran Biologi untuk sekolah menengah, dan perguruan tinggi; teknologi pembelajaran Biologi; pengembangan profesionalisme guru bidang studi Pendidikan Biologi; pembelajaran Biologi inovatif dengan menerapkan berbagai pendekatan seperti pendekatan realistik, pendekatan CTL, dan sebagainya. Sain Biologi mencakup Biologi molekuler; Bio-Ekologi; Biodiversiti; Konservasi dan bidang kajian lain yang relevan dengan Biologi dalam arti luas. Jurnal ini diterbitkan dua kali dalam setahun (Juli dan Desember). Artikel yang sudah diterima dan siap dipublikasikan melalui online (early view) secara bertahap serta versi cetaknya akan diedarkan pada akhir periode penerbitan online.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 184 Documents
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Struktur Komunitas dan Pola Zonasi Vegetasi Mangrove di Kampung Kayu Ara Permai, Kabupaten Siak, Provinsi Riau Insani Indah Putri; Yusni Ikhwan Siregar; Eko Prianto
SIMBIOSA Vol 15, No 1 (2026)
Publisher : Program Studi Pendidikan Biologi, Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/simbiosa.v15i1.9345

Abstract

Kawasan mangrove Kampung Kayu Ara Permai, Kecamatan Sungai Apit, Kabupaten Siak telah berkembang menjadi destinasi ekowisata berbasis konservasi swadaya masyarakat, namun pemahaman ilmiah tentang kondisi ekologis aktualnya masih belum memadai. Penelitian ini mengkaji komposisi floristik, struktur dan stratifikasi tegakan, dominansi spesies, keanekaragaman ekologi, serta pola zonasi vegetasi mangrove di kawasan tersebut menggunakan metode plot tunggal berukuran 10×10 m sebanyak 27 plot yang tersebar pada tiga zona komunitas. Inventarisasi mencatat 35 entri taksonomi yang terdiri atas 34 spesies teridentifikasi, dengan 21 spesies mangrove sejati (61,8%) dan 13 spesies mangrove asosiasi (38,2%). Famili Rhizophoraceae mendominasi dengan enam takson, dan Sonneratia ovata berstatus Near Threatened (NT-IUCN) tercatat hadir dalam plot. Kerapatan bervariasi sangat tajam antarstrata: semai 16.060 ind./ha, pohon 2.519 ind./ha, dan pancang 1.121 ind./ha, dengan rasio semai–pancang 14,3:1 yang mengindikasikan tekanan saringan ekologis pada fase transisi pertumbuhan. Sebanyak 89,0% individu pohon terkonsentrasi pada kelas diameter 4–20 cm dan 75,7% berada di bawah ketinggian 10 m, mencerminkan tegakan yang aktif beregenerasi namun belum matang secara struktural. Dominansi spesies bersifat life-stage specific, dengan Rhizophora apiculata memimpin pada strata pohon (INP 71,79) dan semai (INP 64,62), sementara Scyphiphora hydrophyllacea dan Bruguiera gymnorrhiza menjadi komponen paling penting pada strata pancang. Nilai Shannon-Wiener berkisar antara H' = 1,62 hingga 2,22 dengan kemerataan yang menurun dan dominansi yang meningkat pada strata yang lebih muda. Pola zonasi tidak mengikuti gradien linear seaward–landward, melainkan terbentuk sebagai mosaik komunitas dengan kekayaan spesies tertinggi pada zona belakang yang diduga dipicu oleh abrasi fisik dan dinamika hidrodinamika lokal. Temuan ini menegaskan bahwa pendekatan multi-strata dan pemantauan berbasis ekologi merupakan fondasi yang tidak dapat dihindari dalam pengelolaan kawasan mangrove yang berkelanjutan
Evaluasi Laju Pemberian Pakan dan Rasio Konversi Pakan sebagai Indikator Efisiensi Domestikasi Ikan Betutu (Oxyeleotris marmorata) pada Sistem Kolam Terpal Syaiful Ramadhan Harahap; Toni Anggara; Andi Yusapri; Khairul Ihwan; Arief Rachman B; Abdul Gani; Muhammad Thaha; Gusmanto Gusmanto
SIMBIOSA Vol 15, No 1 (2026)
Publisher : Program Studi Pendidikan Biologi, Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/simbiosa.v15i1.9418

Abstract

Marble goby (Oxyeleotris marmorata) production relies heavily on wild catches, creating a need for feed-efficient domestication strategies to support sustainable aquaculture. This study evaluated the feeding rate (FR), feed conversion ratio (FCR), specific growth rate (SGR), and survival of marble goby reared in tarpaulin ponds. Fifteen fish were cultured for 56 days in three ponds, with five fish per pond, and fed twice daily with chopped fresh trash fish to apparent satiation. The data were assessed descriptively and using quadratic polynomial regression. The mean FR ranged from 1.30 to 1.75% biomass day⁻¹, cumulative FCR from 6.53 to 10.67, and cumulative SGR from 0.19 to 0.26% day⁻¹. Pond 1 showed the most balanced performance, with an FCR of 6.53, biomass gain of 154 g, and 100% survival, whereas Pond 2 experienced 40% mortality. The FR–SGR relationship followed a quadratic pattern, with a stationary point at 1.45% biomass day⁻¹ (R² = 0.3804). This value represents an efficient feeding range rather than a definitive optimum. Controlled feeding in tarpaulin ponds supports early-stage domestication and may reduce dependence on wild marble goby stocks.
Pemanfaatan Limbah Organik Terfermentasi Bokashi pada Budidaya Lele Dumbo (Clarias gariepinus): Dampak terhadap Performa Pertumbuhan dan Kelangsungan Hidup Tania Octama Saputri; Arief Rachman B; Syaiful Ramadhan Harahap; Khairul Ihwan; Nurhasan Nurhasan
SIMBIOSA Vol 15, No 1 (2026)
Publisher : Program Studi Pendidikan Biologi, Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/simbiosa.v15i1.9370

Abstract

Feed costs and organic waste accumulation remain major constraints to efficient and sustainable catfish farming, creating the need to evaluate fermented quail manure bokashi as an alternative feed ingredient. This study assessed the most effective bokashi formulation for absolute length gain, absolute weight gain, and survival of juvenile Clarias gariepinus. Fish were reared for 60 days in a completely randomized design comprising four treatments with three replicates: 100% commercial pellets (P0), 100% bokashi (P1), 25% bokashi and 75% rice bran (P2), and 75% bokashi and 25% rice bran (P3). Among the bokashi-based diets, P3 produced the best performance, with an absolute length gain of 10.60 cm, an absolute weight gain of 55.33 g, and a survival rate of 95.00%. Dietary treatments did not significantly affect length or weight gain (p > 0.05) but significantly influenced survival (p < 0.001). The mean temperature, pH, and dissolved oxygen were 29°C, 7.19, and 5.46 mg L⁻¹, respectively, indicating suitable rearing conditions. Therefore, the P3 formulation offers potential as an organic-waste-based feed alternative, although it cannot yet fully replace commercial pellets and requires further evaluation of feed efficiency, nutrient retention, and waste balance.
Population Biology and Utilization Status of Motan Fish (Thynnichthys thynnoides) in Lake Karangan, Pelalawan Regency, Riau Aida Rama Rani; Eko Prianto; Muhammad Fauzi
SIMBIOSA Vol 15, No 1 (2026)
Publisher : Program Studi Pendidikan Biologi, Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/simbiosa.v15i1.9375

Abstract

The motan fish (Thynnichthys thynnoides) is one of the economically important fish species found in the waters of the Kampar River, including Lake Karangan, Rantau Baru Village, Pangkalan Kerinci Sub-district, Pelalawan Regency. Fishing activities that take place almost year-round, coupled with the use of fishing gear with relatively small mesh sizes, are thought to place pressure on motan fish stocks. This study aims to analyse biological parameters and determine the exploitation status of the motan fish in Lake Karangan. The research was conducted from January to March 2026 using a survey method involving sampling of fishermen’s catches. Population parameter analysis was performed using the FISAT II software, whilst the exploitation status was analysed using the Length-Based Spawning Potential Ratio (LB-SPR) method. A total of 242 motan fish were collected, ranging in length from 95–169 mm. The results of the study indicate that motan fish exhibit a negative allometric growth pattern with a b-value of 2.8205. The growth parameters obtained were asymptotic length (L∞) 175.35 mm, growth coefficient (K) 0.610 per year, and t0 of -0.31 years. The values for total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation rate (E) were 2.50; 0.82; 1.69; and 0.67 per year, respectively. The results of the LB-SPR analysis indicate a first-capture length (SL50) of 105.92 mm, a first-maturity length (Lm50) of 109 mm, and a Spawning Potential Ratio (SPR) of 16%. These values indicate that the exploitation status of motan fish in Lake Karangan is in the ‘over-exploited’ category; therefore, management efforts are required through the regulation of catch sizes and the use of more selective fishing gear to support the sustainability of motan fish stocks.

Page 19 of 19 | Total Record : 184

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