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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology Media Akuatika: Jurnal Ilmiah Jurusan Budidaya Perairan
Gultom, Victor David Nico
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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Pengaruh Rasio Jantan Dan Betina Terhadap Proses Reproduksi Ikan Koridoras (Corydoras trilineatus) Gultom, Victor David Nico
Jurnal Media Akuatika Vol 7, No 1 (2022): Januari
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (536.239 KB) | DOI: 10.33772/jma.v7i1.21074

Abstract

Ikan koridoras memiliki proses reproduksi yang unik dimana ikan betina dapat memijah dengan banyak ikan jantan sekaligus. Akibatnya, rasio jantan dan betina berpengaruh terhadap produktivitas ikan koridoras. Penelitian ini bertujuan untuk mengevaluasi pengaruh rasio jenis kelamin terhadap kemampuan reproduksi koridoras. Penelitian ini terdiri atas 5 perlakuan rasio jantan dan betina, yaitu A (3 jantan : 1 betina), B (2 jantan : 1 betina), C (1 jantan : 1 betina), D (1 jantan : 2 betina), dan E (1 jantan : 3 betina). Variabel yang diamati adalah jumlah telur yang diproduksi dan frekuensi pemijahan untuk setiap perlakuan. Analisa data variabel dilakukan dengan metode deskriptif. Perlakuan E menghasilkan produksi telur yang paling tinggi dibandingkan perlakuan lainnya sementara Perlakuan C menghasilkan frekuensi pemijahan yang paling tinggi. Agar produktivitas reproduksi saat proses pemijahan menjadi optimal, maka rasio jumlah betina harus 3 kali lebih banyak dibandingkan jumlah jantan.Kata kunci : Corydoras trilineatus, koridoras, rasio jantan dan betina, reproduksi
DIVERSITY, MORPHOMETRY, AND POPULATION ABUNDANCE OF SEA URCHIN (Tripneustes gratilla) IN NORTH LOMBOK Gultom, Victor David Nico
BIOTROPIA Vol. 32 No. 1 (2025): BIOTROPIA Vol. 32 No. 1 April 2025
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2025.32.1.2131

Abstract

Article Highlights- The highest absolute abundance of sea urchin Tripneustes gratilla was observed in August 2023- In 2024, the low absolute abundance of Tripneustes gratilla and the decline of sea urchin species diversity in North Lombok prospectively indicated overharvesting.- The number of gleaners and the gleaning activity conducted by local villagers prospectively harm seagrass meadows, especially on Tripneustes gratilla abundance AbstractSea urchin Tripneustes gratilla is commonly found in tropical shallow water-seagrass beds and is consumed for its roe in Southeast Asia. This study recorded five sea urchin species in the study area: Tripneustes gratilla, Pseudoboletia maculata, Salmacis bicolor, Salmacis sphaeroides, and Maretia planulata, with T. gratilla being the most abundant. The highest absolute abundance of T. gratilla was observed in August 2023, at 0.30 ind./m2, while from May to July 2024, it declined to 0.02 ind./m2. The mean diameters of T. gratilla ranged from 37.59 mm to 44.16 mm between August and October 2023 and from 17.39 mm to 48.45 mm between May and July 2024, having wide range of the mean weight. In September 2023, sea urchin with a test diameter of 35.0 – 39.9 mm were the most frequent to be found. This study provided baseline data on T. gratilla harvested from the seagrass habitat by the local community in North Lombok and highlights the potential for overharvesting in the area.
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