Population dynamics of Strombus luhuanus, Linneaus 1758 from Oma coastal waters, Central Maluku, Eastern Indonesia

Abstract Strombus luhuanus (strawberry conch), Linneaus 1758 is a marine mesogastropod belongs to Strombidae family. S. luhuanus is locally consumed by coastal communities in Maluku province to fulfill their protein needed, which will decreasing the stock in natural environment. The biological study including population dynamics needed to maintain S. luhuanus population. The research was conducted in Oma coastal water, Central Maluku, Eastern Indonesia during January to December 2019. The objectives of this research were to study the aspect of population dynamics of S. luhuanus such as asymptotic length (L∞), growth coeficient (K), natural mortality (Z), exploitation rate (E) and recruitment. A total of 1823 individual of S. luhuanus found in this study which consisted of 831 individual of males and 992 individual of females population. Shell size of S. luhuanus varied monthly. The result showed that in general, the male population showed five cohort, while the female showed six cohort. L∞ = 63.40 mm, K = 0.65 for females population; whilst for the males population, L∞ = 69.80 and K = 0.5. Total mortality (Z) for both population were Z = 3.03 and Z = 4.32, respectively. Exploitation rate of S. luhuanus in this study area showed that the population was overexploited (E = 0.64 and E = 0.79 for females and males population, respectively).</jats:p

The community structure of giant clam in the waters of Morella village, Leihitu region, Central Mollucas Regency

Abstract Kima (giant clams) are molluscs that inhabit the ocean floor on the reef and sand substrate. There are 7 species found in the waters of Indonesia namely Tridacna maxima, T. squamosa, T. gigas, T crocea, T derasa, Hippoppus hippoppus and H. porcelanus. Kima are included among the protected biota, both nationally and internationally. This research was conducted on the waters of Morella Village, Leihitu Region, Central Mollucas Regency. The study sites are divided into two stations: Station 1 is the waters of Mahiwa Bay and Station 2 is the waters of Tihlepuai Bay. Station 2 is a Kima farm established in December 2016 by the Minister of Marine Affairs and Fisheries. Samples were collected by using the belt transect method. The results obtained are as follows. In Station 1, the 2 species found are T. maxima and T. squamosa, while the 4 species found in Station 2 are T. maxima, T. squamosa, T crocea and H. hippoppus. The highest value, abundance, density, and frequency of occurrence were represented by T. squamosa. The diversity and homogeneity indexes in the waters of Morella village were in the high and medium levels, respectively. The result of this research will add data contribution in determining strategies for kima conservation in Mollucas.</jats:p

Survival and growth of transplanted coral reef in lagoon ecosystem of Ihamahu, Central Maluku, Indonesia

Abstract Lagoon ecosystem in Ihamahu has a high potential of biological resources which is utilized by the local community to catch fish in order to fulfill their daily needs. High level of utilization affects coral reef community in the lagoon. This study aims to analyze the survival and growth of life coral transplantation in the lagoon of Ihamahu village. Life corals were transplanted on an artificial substrate of block cement and placed into two lagoons namely Ayao lagoon (Acropora millepora, Porites nigrenscens, and P. cylindrical) and Besar lagoon (Acropora divaricata, A. cardus, Anaropora peurtogelerae, Montipora stelata, and Pavona cactus). The results showed that after three months, all transplanted coral reef in Ayao lagoon survived (100%) whilst only 57% of those in Besar lagoon survived. The results also showed that during the study period, P. nigrenscens grew faster (2.1 cm yr−1) than two other species in Ayao lagoon whereas, in Besar lagoon, A. peurtogelerae showed faster growth (2.70 cm yr−1) compare to the other four species.</jats:p

Analisa Kepadatan dan Identifikasi Aktivitas Pemanfaatan Sumberdaya Moluska di Perairan Pantai Tanjung Tiram, Desa Poka

Meningkatnya aktivitas pemanfaatan sumberdaya moluska oleh masyarakat, baik yang berdomisili di sekitar maupun di luar perairan Pantai Tanjung Tiram dapat berdampak terhadap keberlanjutan sumberdaya tersebut. Penelitian ini bertujuan untuk menganalisis kepadatan moluska serta mengidentifikasi aktivitas pemanfaatan sumberdaya moluska di perairan Pantai Tanjung Tiram. Penelitian dilakukan pada Oktober-November 2019 di perairan Pantai Tanjung Tiram Desa Poka. Pengumpulan data dilakukan dengan menggunakan metode transek linier kuadrat dan wawancara. Hasil penelitian menunjukkan densitas tertinggi diwakili oleh Nassarius quadrasi untuk kelas gastropoda sedangkan untuk kelas bivalvia diwakili oleh Marcia sp. Tingginya densitas pada kedua jenis moluska ini disebabkan oleh kesesuaian habitat yang didukung oleh kualitas perairan. Berdasarkan data responden, terdapat 20 jenis moluska yang dimanfaatkan baik untuk dikonsumsi, di jual maupun sebagai bahan baku pembuatan aksesoris melalui aktivitas “bameti”. Aktivitas pemanfaatan dilakukan oleh kelompok perempuan dan anak-anak. Waktu pengambilan moluska dilakukan pada saat air surut yang berlangsung 2 kali dalam seminggu dengan menggunakan alat bantu seperti tempurung kelapa, sendok, serok dan parang. &nbsp; Kata Kunci: kepadatan, aktivitas pemanfaatan, moluska, “bameti”, perairan Pantai Tanjung Tiram &nbsp

Community structure of conches (Strombus spp) in seagrass bed of Haria, Central Maluku, Indonesia

Abstract The coastal community especially women and children in Maluku usually utilize marine organisms when low tide or locally known as bameti. The gear use in this activity is simple such as spear, knife, and digger, or even by using bare hand. One of the target marine organisms is the conch (Strombus spp) that lives in the coastal area on a seagrass bed. This research was conducted to study the community structure of Strombus spp in Haria coastal waters, Central Maluku, Indonesia in February 2020. The sample was collected by using transect linear quadrate with the size of quadrate is 1൱m2. As many as 297 individuals of Strombus spp were collected during the study which consists of five species namely Strombus labiatus, S. mutabilis, S. urceus, S. gibberulus, and S. luhuanus. S. labiatus has the highest density and occurrence frequency while the lowest belongs to S. luhuanus. Based on ecological indexes, Strombus spp in the area have high diversity and high evenness with low dominance.</jats:p