MFRDMD Journal Articles
http://hdl.handle.net/20.500.12066/656
These papers were contributed by MFRDMD staff to various national and international journals2024-03-29T01:02:43ZPhysical characteristics and nutrients status off Pulau Besar, Malacca and Tanjung Tuan, Negeri Sembilan, Malaysia: A preliminary study
http://hdl.handle.net/20.500.12066/7403
Physical characteristics and nutrients status off Pulau Besar, Malacca and Tanjung Tuan, Negeri Sembilan, Malaysia: A preliminary study
Zainol, Zuraini; Ali, Azizi; Din, Mohd Safuan Che; Akhir, Mohd Fadzil; Bachok, Zainudin; Ali, Ahmad
Degradation of coastal water quality is one of the major concern in the Malacca Strait since this area is one of the most important fishing ground in Malaysia. Despite being great in the fishery industry, Malacca and Negeri Sembilan somehow recorded the lowest marine fishes landing, which raises a question about dynamics of this area. It is therefore, a preliminary study of the physical properties and nutrient concentrations carried out from 27 March to 4 April 2016 at the coastal water off the southern west coast of Peninsular Malaysia, specifically at Pulau Besar, Malacca and Tanjung Tuan, Negeri Sembilan. Data for temperature, salinity, and dissolved oxygen (DO) was acquired by using Conductivity, Temperature, and Depth (CTD) probe. Meanwhile, nutrient concentrations determination in this study was done by using a Westco Smartchem 200 Discrete Analyser, according to the procedure adopted from United States Environmental Protection Agency (USEPA). In general, results of this study indicated the coastal stations were characterised with cooler, less saline, and high DO waters than stations away from coast. Large sea surface heating and weak winds were determined as the causative factors affecting dynamics of water column at the study area. At nearshore area, temperature, salinity, and DO variability were modulated by degree of freshwater intrusion. High nutrient concentrations at the stations closer to the coast was believed to be associated with river outflow, which acted as the main source of nutrients supply in this area. Comparison to previous study had shown that nutrient concentrations in this research were low, which could contribute to an insight on declining marine fish catches in these two states. With regard to Malaysian Marine Water Quality Criteria and Standard (MWQCS), mean nutrient concentrations at the study area were in Class 1, which are suitable for marine parks and marine protected areas conservation. Regardless of limited scope, the outcome of this study is believed to be a good baseline reference for future studies seeking to understand coastal dynamics.
2019-07-24T00:00:00Z人工催熟による養成クルマエビの効率的な採卵条件
http://hdl.handle.net/20.500.12066/7206
人工催熟による養成クルマエビの効率的な採卵条件
Fuseya, Reiko; Tamaki, Motoya; Hayashibara, Takeshi; Katoh, Masaya; Shimizu, Hirofumi
Efficient spawning conditions through artificially induced maturation by unilateral eyestalk ablation were investigated for the kuruma prawn Marsupenaeus japonicus. After unilateral eyestalk ablation, 24℃ was the most efficient water temperature for spawning (rate, number of spawning times, and number of eggs) in the comparison of four water temperatures (20, 22, 24, and 26℃). Egg diameter tended to increase with decreasing water temperature. As a result of unilateral eyestalk ablation at different molting stages, the postmolt stage was better in spawning rate and survival until spawning. Based on these results, individuals that seemed to be in the postmolt stage were selected manually, subjected to eyestalk ablation, and reared at 24℃. Prawns were randomly split into two feeding groups of compound feed or live polychaete. Unilateral eyestalk ablation enabled spawning of the group consuming the compound feed. For both feeding groups, most individuals spawned on Day 10.
Text in Japanese with English abstract.
2020-01-01T00:00:00ZPhylogeography of the Japanese scad, Decapterus maruadsi (Teleostei; Carangidae) across the Central Indo-West Pacific: Evidence of strong regional structure and cryptic diversity
http://hdl.handle.net/20.500.12066/7208
Phylogeography of the Japanese scad, Decapterus maruadsi (Teleostei; Carangidae) across the Central Indo-West Pacific: Evidence of strong regional structure and cryptic diversity
Jamaludin, Noorul-Azliana; Mohd-Arshaad, Wahidah; Mohd Akib, Noor Adelyna; Zainal Abidin, Danial-Hariz; Nghia, Nguyen Viet; Nor, Siti-Azizah Mohd
The Japanese scad Decapterus maruadsi (Carangidae) is an economically important marine species in Asia but its exploitation shows signs of overfishing. To document its stock structure, a population genetic and phylogeographic study of several populations of this species from the central part of the Indo-West Pacific region was conducted using the mitochondrial cytochrome b gene. Genetic homogeneity within the Sundaland region’s population, including Rosario (the Philippines) and Ranong (Andaman Sea) populations was revealed with low nucleotide diversity (π = 0.001–0.003) but high haplotype diversity (h = 0.503–0.822). In contrast, a clear genetic structure was observed between this group and the northern Vietnam populations as revealed by F<sub>ST</sub>, AMOVA and SAMOVA, while the central Vietnam population of Khanh Hoa is an admixed group between the two differentiated regional populations. The neutrality and mismatch distribution analyses supported a demographic expansion of D. maruadsi in between last Pleistocene to early Holocene period which influenced present day distribution pattern. Contemporary factors such as oceanic currents and different life history traits are also believed to play significant roles in the observed population structure and biogeographical pattern. Based on these results, recommendations on how stocks of the Japanese scad should be managed are offered.
2020-01-01T00:00:00ZFeasibility of a single‐species quota system for management of the Malaysian multispecies purse‐seine fishery
http://hdl.handle.net/20.500.12066/7114
Feasibility of a single‐species quota system for management of the Malaysian multispecies purse‐seine fishery
Harlyan, Ledhyane Ika; Matsuishi, Takashi Fritz; Mohammad Faisal, Md Saleh
Malaysian fisheries employ multiple measures to improve management; however, not all are well-suited to the multispecies fisheries. As part of a pilot project, an individual quota system was introduced for the purse-seine fishery off the East Coast of Peninsular Malaysia (ECPM), but no assessment of this particular measure nor the feasibly of its implementation has been confirmed. Therefore, this study analysed spatial and temporal patterns of purse-seine fishing, by collecting catch composition data per landing and its fishing ground within three period fishery surveys between August 2017 and September 2018 at six different landing sites. Similarity and cluster analysis examined species composition and diversity to determine the feasibility of implementing a single-species quota system in this multispecies fishery. Some overlapped of indices results and minor difference in catch composition were found due to changes in spatial and temporal fishing activities. However, no specific spatial or temporal patterns were discernible as structuring the fishing grounds used by purse-seiners. The absence of patterns, using the available data, might be attributable to huge species aggregations and widely distributed and homogenously mixed fish stocks. Thus, it is likely impractical to manage species individually in such a multispecies fishery.
2021-01-01T00:00:00Z