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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Kelautan Tropis
Eka Maya Kurniasih, Eka Maya
Indonesian Biodiversity Research Center, Jl. Raya SesetanGg. Markisa No. 6. Denpasar, Bali, 80223 Indonesia.
Earth & Planetary Sciences

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DNA Barcoding of Anchovy in Tuban Regency as Database of Indonesian Marine Genetic Diversity Joesidawati, Marita Ika; Nursalim, Nining; Kholilah, Nenik; Kurniasih, Eka Maya; Cahyani, Ni Kadek Dita; Ambariyanto, Ambariyanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 4 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.4.383-391

Abstract

Anchovy is the main catch and the primary consumption of coastal communities in Indonesia, and its production shows an increase of more than 10% in 2021. Tuban district, in East Java, Indonesia is part of the WPP 712 (Wilayah Pengelolaan Perikanan or Fisheries Management Area) and highly produces anchovies’ fisheries. Anchovy has a small size, making it difficult to identify morphologically. This study aimed to genetically identify anchovy samples obtained from North Java (Tuban) waters. Molecular identification was conducted by utilizing Cytochrome Oxidase Subunit I (COI) gene using jg-HCO and jg-LCO primers. This study observed 12 individual samples with 623 base pair sequence length. Five species were obtained, namely four species of anchovies (Encrasicholina heteroloba, Encrasicholina punctifer, Stolephorus waitei, and Stolephorus insularis) and one species of sardines (Dussumieria elopsoides) with 99.84-100% similarity to NCBI sequences data. Anchovies typically have a streamlined body with a slightly compressed shape. Anchovies have cycloid scales, which are smooth-edged and relatively small, ranging from a few centimeters to around 20 centimeters in length. Some of the genus from the Anchovy group are Encrasicholina and Stolephorus. The phylogenetic tree reconstruction leads into four clades with a genetic distance between clades of 17,9-24,5 %. This research provides methods and data on the genetic diversity of anchovies taxa caught in Tuban, East Java. The findings are expected to support promoting new standards for healthier and more sustainable anchovy stocks in the country. Overall, this study contributes to providing valuable insights for fisheries management and conservation efforts in Indonesia.
Safety Assessment of Ocean Current in Pantar Strait for Marine Tourism Prasetyo, Akhmad Tri; Patriadi, Andi; Ahsin, Awaludin; Nurhidayat, Nurhidayat; Purwanto, Budi; Sobaruddin, Dyan Primana; Muslim, Muslim; Hendri, Muhammad; Hermialingga, Septi; Kurniasih, Eka Maya
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 4 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.4.530-542

Abstract

The Pantar Strait with its coral reef ecosystem has encouraged many tourists to dive since the last decade. At least, ten coral reef ecosystem sites in Pantar Strait have been indicated as having potential for marine tourism, such as Munaseli Beach, Obisinga Beach, Umangdang Beach, Alor Eco Dive Resort, Ternate Island, Bakalang Beach, Pura Diving Spot, Nuhakepa Diving Spot, Pasir Putih Beach, and Savu Alor. This study illustrated the annual dynamics of ocean currents in Pantar Strait, subsequently assessing the safety rate of commercial diving at those tourism sites in each season. A three-dimensional hydrodynamic model was generated by the Delft3d flow module to illustrate the annual ocean current dynamic in the Pantar Strait. The safety assessment for marine tourism was classified into 3 levels (safe, alert, and dangerous). Ocean currents exceed maximum velocities in the west season. Various marine tourism sites close to steep slopes were not recommended for commercial diving. They are Munaseli Beach, Obisinga Beach, Pura Diving Spot, and Pasir Putih Beach. These sites experienced an increase in average currents that exceeded the safe threshold each season. Alor Eco Dive Resort was designated as the safest marine tourism, which showed a safe level for either average or maximum ocean currents in each season. Nuhakepa Diving Spot was designated as the second safest marine tourism. Several tourist sites that showed the danger of commercial diving in the west season were Umangdang Beach and Savu Alor. Many tourism sites showed an alert current for commercial diving in Springtide. Therefore, tourists are advised to avoid diving during the spring tide.
Biology Fisheries of Threadfin Bream Fish (Family: Nemipteridae) Landed at Oeba Fish Landing Site and Oesapa Fish Market, Kupang City Wora, Umbu Domu; Wijayati, Diah Permata; Widowati, Ita; Nursalim, Nining; Kolilah, Nenik; Ginzel, Fanny Iriyany; Kurniasih, Eka Maya
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22949

Abstract

The threadfin bream fish from the Nemipteridae family is a demersal species and an economically significant commercial fish. It is widely used for personal consumption and sold in markets. The capture of threadfin bream fish at the Oeba Fish Landing Site and Oesapa Fish Market has been increasing. Continuous high-intensity fishing will likely negatively impact the threadfin bream fish population, leading to stock depletion and reduced catch production. Research on threadfin bream fish in East Nusa Tenggara has yet to be reported, particularly in Kupang Bay and Rote Ndao waters. This study aims to investigate the fisheries biology of threadfin bream fish landed at the Oeba Fish Landing Site and Oesapa Fish Market. A total of 84 threadfin bream fish were sampled from both locations. The length-weight relationship of threadfin bream fish at these sites is negatively allometric with value b < 3, indicating that length growth is more dominant than weight gain. The gonad maturity stages of male and female threadfin bream fish range from GSM I-III. The size distribution of threadfin bream fish ranges from 173-295 mm at the Oeba Fish Landing Site and from 173-245 mm at the Oesapa Fish Market. Most of the threadfin bream found are still in the early stages of gonadal maturity, indicating that these fish are young and not yet ready to spawn. Implementing Sustainable fishing management practices is crucial, including setting catch quotas and minimum catch sizes and educating fishermen to ensure the sustainability of threadfin bream fish stocks.
Genetic Analysis on Horseshoe Crab for Phylogenetic Tree Study from Jambi, Bangka Belitung, Central Java, and East Java Province, Indonesia Kholilah, Nenik; Kurniatami, Gabriella Tarida; Kurniasih, Eka Maya; Nursalim, Nining; Janarkho, Galank Fad’qul; Ambariyanto, Ambariyanto; Wijayanti, Diah Permata; Putro, Sapto Purnomo; Cahyani, Ni Kadek Dita
Jurnal Kelautan Tropis Vol 28, No 2 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i2.25923

Abstract

Order Xiphosura, or horseshoe crabs, are rarely found and classified as macrofossils. In Indonesian waters, there are three species: Tachypleus tridentatus, Tachypleus gigas, and Carcinoscorpius rotundicauda. The genetic analysis of their kinship, however, has been extensively unexplored. This study aims to utilize DNA barcoding, focusing on the cytochrome c oxidase subunit I (COI) locus from mitochondrial DNA and investigating the phylogenetic relationships of horseshoe crabs from the four sites (Tanjung Jabung Timur Regency in Jambi, Bangka Regency in Bangka Belitung, Demak Regency in Central Java, and Tuban Regency in East Java). Additionally, the study provides insights into the biodiversity and ecological roles of horseshoe crabs within their ecosystems and surrounding habitats. Through molecular methods, this research focuses on biodiversity analysis through Sanger sequencing and MEGA 11 software for constructing phylogenetic trees and calculating genetic distances. With a total of 22 horseshoe crabs, the DNA samples from four different sites were amplified via Sanger sequencing, targeting the COI locus and analyzing with MEGA 11. The phylogenetic tree analysis revealed two distinct species, Tachypleus gigas, and Carcinoscorpius rotundicauda, exhibiting significant genetic variation between them. A clear genetic separation between the two species was observed. Otherwise, within the C. rotundicauda species, a minor genetic variation was detected between sampling sites. Notably, the genetic composition displayed greater differences between samples from Java and Sumatra compared to differences within each island. The future research should expand the sampling size and include additional genetic markers to provide a more comprehensive understanding of the genetic diversity and evolutionary history of horseshoe crabs in Indonesian waters. Integrating ecological and environmental data could further elucidate the factors driving genetic differentiation and inform conservation strategies.
Co-Authors Ahsin, Awaludin Akhmad Tri Prasetyo Ambariyanto , Budi Purwanto Diah Permata Wijayanti Ginzel, Fanny Iriyany Hermialingga, Septi Ita Widowati Janarkho, Galank Fad’qul Kholilah, Nenik Kolilah, Nenik Kurniatami, Gabriella Tarida Marita Ika Joesidawati Muhammad Hendri Muslim Muslim Ni Kadek Dita Cahyani, Ni Kadek Dita Nurhidayat Nurhidayat Nursalim, Nining Patriadi, Andi Sapto P Putro Sobaruddin, Dyan Primana Wijayati, Diah Permata Wora, Umbu Domu