Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences
Dio Dirgantara
Faculty of Science, University of the Ryukyus
Earth & Planetary Sciences

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Nutrient Enrichment Impact of Wastewater Shrimp Ponds on Coral Reefs of Nyamplungan Village, Karimunjawa Raja Aditya Sahala Siagian; Agus Sabdono; Sunaryo Sunaryo; Agus Trianto; Dio Dirgantara
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 3 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.3.267-278

Abstract

Increased nutrients can cause a rise prevalence in coral disease. Shrimp pond wastewater can produce nitrate, phosphate, and ammonia from the residual of the feeding and shrimp feces. Nyamplungan village, Karimunjawa was selected as the study site as it represents a location with shrimp pond activity that close to coral reef ecosystem. This study aims to examine the difference of disease prevalence, coral cover, and coral genus diversity at ±300 m and ±1000 m from the shrimp pond and to examine the relationships between disease prevalence and nutrients (nitrate, phosphate, ammonia). Coral disease prevalence was measured within a modified 30 x 2 m belt transect at six sampling stations. Station 1, 2, and 3 were 6-8 m in depth (±1000 m from the shrimp pond), then station 4, 5, and 6 were depth 1-3 m (±300 m from the shrimp pond). Coral genus diversity was conducted by using the Roving Diver Visual Method. Coral cover was measured within Line Intercept Transect (LIT) 30 m. The results show that station 5 had the highest disease prevalence (30.80%±2.78%). Station 1 had highest coral cover (90.87%±7.16%). Coral genus diversity had a medium category for each station. Disease prevalence was significantly different between station depths of 1-3 m (±300 m to the shrimp pond) and depths 6-8 m (±1000 m from the shrimp ponds) (P<0.05). Disease prevalence had strong relationship with nitrate (r= 0.975), phosphate (r= 0.972) and ammonia (r= 0.958). These results suggest that the continuation of coral monitoring with additional disease incidence and disease progression, temporally.
DNA Barcoding and Morphological Characters of Two Trevally Fish species (Caranx Spp.) Collected from Youtefa Bay, Papua, Indonesia Tamara Louraine Jeanette Kainama; Diah Permata Wijayanti; Agus Sabdono; Dio Dirgantara
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.97-104

Abstract

Trevally fish (Caranx spp,) or Kuwe fish (local name) are small pelagic fish that are mostly caught in the waters of Youtefa Bay. There are two types of Kuwe fish that are difficult to distinguish due to morphological similarities. These Kuwe fish have no scientific species identification so they have several different local names. Accordingly, it is necessary to identify and find out the proper naming of the two Kuwe fish. DNA barcoding is a technique used to speed up and simplify the process of identifying organisms. Hence, the purpose of this research was to identify the proper scientific name of the two Kuwe species in Youtefa Bay waters, as well as the kinship between these two types by applying a DNA barcoding technique. Nineteen Kuwe fish were sampled at Youtefa Bay, Jayapura, Papua in July 2022. Samples were studied morphologically, then carried directly to the Integrated Laboratory of Diponegoro University for molecular studies. DNA extraction, amplification, and DNA sequencing were carried out to further validate the species’ identification. The results showed that in the initial assessment of the specimens using taxonomic keys, 10 specimens were identified as Caranx sexfasciatus and 9 specimens were identified as Caranx tille. The relationship between length and weight of C. sexfasciatus and C. tille have resulted in b = 2.5754 with R2 = 0.8564 and   = 1.7119 with R2 = 0.6705, respectively. All identifications were confirmed as correct based on BLASTn results. The BLAST analysis demonstrated that 10 samples were closely related to C. sexfasciatus  (99%-100% in similarity) and 9 samples were similar to C. tille (97%- 99%). The genetic distance between individuals in C. sexfasciatus and C. tille has a value ranging from 0% - 0.2%, and the phylogenetic tree exposed that the two species are included in different clades. This study revealed that there are two species of Kuwe fish (C. sexfasciatus and C. tille) in Youtefa Bay, Papua, Indonesia.
Co-Authors Agus Sabdono Agus Sabdono Agus Trianto Diah Permata Wijayanti Raja Aditya Sahala Siagian Sunaryo Sunaryo Tamara Louraine Jeanette Kainama