Jurnal Moluska Indonesia

Front Matter

adminwebsitejmi adminwebsitejmi — Wed, 01 Apr 2026 00:00:00 +0700

Front Matter

Morphological and Growth Study of Three Edible Clam Species in Sayung, Demak

Taqiyya Hikma Rodhiyya, Delianis Pringgenies, Dwi Haryanti — Wed, 01 Apr 2026 00:00:00 +0700

Mollusks are valuable aquatic biological resources widely consumed by coastal communities.This study aims to characterize the morphology and size of edible mollusks collected from local middlemen in the waters of Sayung, Demak. The research includes morphological identification, measurement of body dimensions (length, width, height, and weight), analysis of size variation among species, and the relationship between morphology and commercial potential. Samples were obtained from local collectors and analyzed through taxonomic identification and morphometric measurements. Three species were identified: Anadara granosa (blood cockle), Perna viridis (green mussel), and Amusium pleuronectes (fan shell), with A. granosa being the most abundant (383 individuals), followed by P. viridis (331 ) and A. pleuronectes (191 ). Size measurements varied, with lengths ranging from 1.54–8 cm, heights from 1.048–9.7 cm, widths from 0.72–7.492 cm, and weights from 3.75–41.57 grams. Statistical analysis revealed that all three species exhibited negative allometric growth (b<3) in the length–weight and width–weight relationships, meaning that increases in size were not proportional to increases in weight. However, A. pleuronectes showed positive allometric growth (b>3) in the height–weight relationship, indicating that height contributed disproportionately more to body mass. These findings suggest varying commercial potential across species, with A. granosa being the most abundant and consistently within marketable size. The data serve as a valuable basis for sustainable mollusk resource management in the Sayung coastal area of Demak.

Dynamics of Population and Secondary Productivity of Isognomon isognomum Clams (Bivalvia: Isognomonidae) in the Waters of Tapulaga Beach, Konawe

Aita Rahma Kartika Jumain, Bahtiar Bahtiar, Abdul Hamid — Wed, 01 Apr 2026 00:00:00 +0700

ABSTRACT

Isognomon isognomum is a bivalve species widely harvested as a local food resource, yet its natural populations show signs of decline. This study aimed to estimate the secondary productivity of I. isognomum in the coastal waters of Tapulaga, Southeast Sulawesi. Field sampling was conducted from September 2024 to February 2025, yielding a total of 360 individuals. Shell length and total weight were measured using a caliper and an analytical balance, respectively. Ash-free dry mass (AFDM) was obtained by combusting dried tissues in a muffle furnace at 600°C for four hours. Density, growth, production, and biomass were analyzed using the Mann–Whitney test, ELEFAN (FiSAT II), and standard ecological productivity formulas. Density analysis showed the highest abundance in December (14 ind/m²) and the lowest in January (9.78 ind/m²). The Mann–Whitney test (p < 0.05) indicated significant differences between December and January compared to other sampling months. Growth parameters revealed an asymptotic length (L∞) of 13.80 cm and a growth coefficient (K) of 0.71. The highest production occurred in the 6.9–7.8 cm size class, reaching 1,181.97 g AFDM/m²/year, while peak biomass (10,703.42 g AFDM/m²) was recorded in the 8.9–9.8 cm size class. The mean P/B ratio was 0.12/year, suggesting a low recovery potential for I. isognomum populations.

Keywords: Isognomon isognomum, secondary productivity, Tapulaga coast

ABSTRAK

Isognomon isognomum merupakan bivalvia yang dimanfaatkan masyarakat sebagai sumber pangan dan cenderung populasinya menurun di alam. Studi ini bertujuan untuk mengetahui produktivitas sekunder kerang I. isognomum di perairan Pantai Tapulaga Sulawesi Tenggara. Penelitian ini dilakukan pada bulan September 2024-Februari 2025. Jumlah sampel yang dikumpulkan selama penelitian sebanyak 360 individu. Sampel kerang diukur panjang cangkangnya dan beratnya masing-masing menggunakan jangka sorong, dan timbangan analitik. Massa kering bebas abu (MKBA) didapatkan dengan membakar daging kering menggunakan tanur selama 4 jam pada suhu 600°C. Data kepadatan, pertumbuhan, produksi dan biomassa masing-masing dianalisis menggunakan uji Mann Whitney, ELEFAN (FiSAT II), dan formula yang telah baku. Hasil analisis kepadatan menunjukkan kepadatan kerang I. isognomum tertinggi pada bulan Desember dan terendah pada bulan Januari dengan nilai masing-masing sebesar 14 dan 9,78 ind/m². Hasil uji Mann Whitney (p<0.05) menunjukkan ada perbedaan signifikan antara bulan Desember dan Januari dari bulan-bulan lainnya. Parameter pertumbuhan (panjang maksimum dan koefisien pertumbuhan) masing-masing sebesar L∞ = 13,80, dan K = 0,71. Produksi kerang tertinggi ditemukan pada ukuran 6,9-7,8 cm dengan nilai 1.181,97g mkba/m²/thn dan biomassa tertinggi ditemukan pada ukuran 8,9-9,8 cm sebesar 10.703,42 g mkba/m². Nilai rata-rata rasio P/B keseluruhan sebesar 0,12/tahun yang berarti bahwa kemampuan pulih kerang I. isognomum berada dalam kategori rendah.

Kata Kunci: Isognomon isognomum, Produktivitas sekunder, Pantai Tapulaga

Temporal Variation in the Reproduction Biology of the Wader Tree Oyster (Isognomon isognomum) in the Waters of Tapulaga

Salsia, Bahtiar Bahtiar, Asriyana — Wed, 01 Apr 2026 00:00:00 +0700

ABSTRACT

Bade-bade mussels (I. isognomum) are filter feeder organisms and are used by the community as foodstuffs, so intensive use has the potential to affect growth and reproduction in natural habitats. This study was to analyze the temporal variation of the reproductive biology of clam I. isognomum in the waters of Tapulaga Beach. This research was conducted from September 2024 to February 2025. Shellfish I. isognomum was taken by purposive random sampling with a total sample of 360 individuals. Furthermore, the scallop samples were measured in length, width, total weight, and weight of wet meat using a caliper (0.05 cm) and a digital scale (0.01 g). Furthermore, the gonads were weighed using an analytical scale (0.0001 g) at the Laboratory of the Faculty of Fisheries and Marine Sciences, Halu Oleo University. The data were analyzed descriptively quantitatively using Chi-Square test methods, gravimetric, and nonlinear regression. The results of the study showed that the sex ratio of male and female mussels was not equal to 1:1 with a ratio of 1:1.73. TKG IV is found almost every month and the peak of spawning occurs in December. The highest IKG of males and females were found in December ranging from 1.61-1.75. The first time the gonads mature is based on the analysis of 50% Lmaturity, which is in the range of 8.9 cm and 9.4 cm..

Keywords: Reproductive biology, Isognomon isognomum, Tapulaga Beach Waters

ABSTRAK

Kerang bade-bade (I. isognomum) merupakan organisme filter feeder dan dimanfaatkan oleh masyarakat sebagai bahan makanan, sehingga pemanfatan yang intensif berpotensi memengaruhi pertumbuhan dan reproduksi di habitat alami. Penelitian ini untuk menganalisis variasi temporal biologi reproduksi kerang I. isognomum di perairan Pantai Tapulaga. Penelitian ini dilakukan pada bulan September 2024 hingga Februari 2025. Kerang I. isognomum diambil secara purposive random sampling dengan jumlah sampel sebanyak 360 individu. Selanjutnya sampel kerang diukur panjang, lebar, berat total, dan berat daging basah menggunakan jangka sorong (0,05 cm) dan timbangan digital (0,01 g). Selanjutnya gonad ditimbang menggunakan timbangan analitik (0,0001 g) di Laboratorium Fakultas Perikanan dan Ilmu Kelautan, Universitas Halu Oleo. Data dianalisis secara deskriptif kuantitatif menggunakan metode uji Chi-Square, gravimetrik, dan regresi non linear. Hasil penelitian menunjukkan nisbah kelamin kerang jantan dan betina tidak sama dengan 1:1 dengan rasio perbandingan sebesar 1:1,73. TKG IV hampir ditemukan pada setiap bulannya dan puncak pemijahan terjadi di bulan Desember. IKG tertinggi jantan dan betina di temukan di bulan Desember berkisar 1,61-1,75. Pertama kali matang gonad berdasarkan analisis Lmaturity 50% yaitu kisaran 8,9 cm dan 9,4 cm.

Kata Kunci: Biologi reproduksi, Isognomon isognomum, Perairan Pantai Tapulaga

The Effect of Water Quality on the Density of Velesunio sp. in the Padi Swamp Waters of Erom Village, Merauke

Wed, 01 Apr 2026 00:00:00 +0700

Rawa Padi has various types of organism, one of which is the Velesunio sp. (Lea, 1859). As freshwater mussels (Velesunio sp.) are used as a source of food needs by the surrounding community. This study aims to analyze the relationship between the density of Velesunio sp. and the water quality in the Rawa Padi waters. Moreover, water quality can be expressed by water quality parameters including physical and chemical parameters. This study was conducted from July to August in 2023. A survey method with a purposive sampling approach were used in this study. Quadrants measuring 1 x 1 m were spread 30 times at each research station during sampling activities. Furthermore, from total duration of sampling, there were a total of 90 quadrants in all research locations. The results showed that the highest density was at station I in July with a density of 7.40 ind/m²; while, the lowest density was at station I in August with density of 1.50 ind/m². On the other hand, water quality namely pH range about 7.93-8.71, temperature between 27⁰C until 32°C, brightness within 4-96 cm, and depth approximately 0.55-0.79 m. Thus, based on regression analysis, it is known that the water quality parameters that have closest relationship to the density of Velesunio sp. in Rawa Padi waters is brightness. The regression value was R = 0.9077 or 90.77% at Station I, R = 0.9962 or 99.62% at Station II, and R = 0.9941 or 99.41% at Station III.

Exploration of the Antibacterial and Enzymatic Potential of Fungal Associated with Giant Clams (Hippopus hippopus Linnaeus, 1978) in Ambon Waters

Eka Wulidanisa, Delianis Pringgenies, Wilis Ari Setyati — Wed, 01 Apr 2026 00:00:00 +0700

Marine fungi associated with giant clams (Hippopus hippopus) are a source of secondary metabolites with great potential in the development of antibacterial agents and enzyme producers. Exploration of fungi from marine organisms is important considering the increasing need for new bioactive compounds. This study aims to: (1) determine the potential antibacterial activity against test bacteria, (2) determine the potential proteolytic, amylolytic, and lipolytic enzyme activities. The research methods include isolation of fungi from clam tissue, antibacterial tests using the agar plug method against test bacteria Staphylococcus aureus, Escherichia coli, Staphylococcus epidermidis, Pseudomonas aeruginosa, and Cutibacterium acnes and enzymatic activity tests.Three isolates of giant clam-associated fungi (Hippopus hippopus) were isolated, namely SK1 10.4, SK1 10.6, and SK1 10.6.2. Antibacterial tests of the three isolates showed inhibitory activity against the growth of test bacteria. Isolate SK1 10.6 was the best candidate because it had stable antibacterial activity and a large inhibition zone. In addition, this isolate also showed protease enzymatic activity.

Key word : Antibacterial; Enzymatic; Hippopus hippopus; Fungi; Molecular

Jamur laut yang berasosiasi dengan kima (Hippopus hippopus) merupakan salah satu sumber metabolit sekunder yang berpotensi besar dalam pengembangan agen antibakteri dan penghasil enzim. Eksplorasi jamur dari organisme laut menjadi penting mengingat meningkatnya kebutuhan terhadap senyawa bioaktif baru. Penelitian ini bertujuan untuk: (1) mengetahui potensi aktivitas antibakteri terhadap bakteri uji, (2) mengetahui potensi aktivitas enzim proteolitk, amilolitik, dan lipolitik. Metode penelitian meliputi isolasi jamur dari jaringan kima, uji antibakteri menggunakan metode agar plug terhadap bakteri uji Staphylococcus aureus, Escherichia coli, Staphylococcus epidermidis, Pseudomonas aeruginosa, dan Cutibacterium acnes, serta uji aktivitas enzimatik. Jamur asosiasi kima (Hippopus hippopus) yang diisolasi sebanyak 3 isolat, yaitu SK1 10.4, SK1 10.6, dan SK1 10.6.2. Uji antibakteri ketiga isolat tersebut menunjukkan adanya aktivitas penghambatan terhadap pertumbuhan bakteri uji. Isolat SK1 10.6 sebagai kandidat terbaik karena memiliki aktivitas antibakteri yang stabil dan zona hambat yang besar. Selain itu, isolat ini juga menunjukkan aktivitas enzimatik protease.

Kata kunci : Antibakteri; Enzimatis; Hippopus hippopus; Jamur; Molekuler

Back Matter

adminwebsitejmi adminwebsitejmi — Fri, 03 Apr 2026 00:00:00 +0700

Back Matter