First record of the Javanese ricefish,
            <i>Oryzias javanicus</i>
            (Bleeker, 1854) (Beloniformes: Adrianichthyidae) in the natural waters of India

Angel, J. Raymond Jani; Vinay, T.N.; Raghavan, Rajeev; Thomas, Dani; Avunje, Satheesha; Aravind, R.; Shekhar, M. S.; Vijayan, K.K.

doi:10.1111/jai.13933

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…We selected Java medaka, Oryzias javanicus, as a potential bioindicator for detection of K. mikimotoi blooms. Java medaka (Bleeker 1854) is a marine relative of the Japanese medaka that was first discovered in Java, Indonesia and inhabits the brackish waters of the Southeast Asian regions (Angel et al 2019). Java medaka is known to tolerate water salinities ranging from freshwater to seawater conditions (Inoue and Takei 2002).…”

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confidence: 99%

First application of one‐class support vector machine algorithms for detecting abnormal behavior of marine medaka Oryzias javanicus exposed to the harmful alga Karenia mikimotoi

Chairil,

Takai,

Koba

et al. 2024

Limnology & Ocean Methods

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It is empirically known that fish exposed to harmful algal blooms (HABs) exhibit abnormal behavior. This might serve as a method for early detection of HABs. There has been no report of the detection of behavioral abnormalities of fish exposed to harmful algae using machine learning. In this study, the behavior of Oryzias javanicus (Java medaka) exposed in a stepwise manner to the HAB species Karenia mikimotoi at densities of 0 cells mL−1 (control), 1 × 103 cells mL−1 (nonlethal), and 5 × 103 cells mL−1 (sublethal) was recorded for 30 min at each cell density using two digital cameras connected to a software that tracked behavioral metrics of fish. The level of anomaly in the behavior of Java medaka was then analyzed using one‐class support vector machines (OC‐SVM) to determine whether the behavioral changes could be considered abnormal. The results revealed abnormal swimming behavior evidenced by an increase of swimming speed, a decrease of shoaling behavior, and a greater depth of swimming in Java medaka exposed especially to the sublethal K. mikimotoi density. The medaka exposed to K. mikimotoi also displayed physical deformities of their gills that were thought to have caused their abnormal behavior. This supposition was confirmed by further analysis using OC‐SVM because the behavior of groups exposed to nonlethal and sublethal densities of K. mikimotoi were considered abnormal compared with that of the control groups. The results of this study show the possibility of using this system for early and real‐time detection of HABs.

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confidence: 99%

First application of one‐class support vector machine algorithms for detecting abnormal behavior of marine medaka Oryzias javanicus exposed to the harmful alga Karenia mikimotoi

Chairil,

Takai,

Koba

et al. 2024

Limnology & Ocean Methods

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Molecular phylogeny and phylogeography of ricefishes (Teleostei: Adrianichthyidae: Oryzias) in Sri Lanka

Sudasinghe

Ranasinghe²,

Wijesooriya

et al. 2022

Ecology and Evolution

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Ricefishes of the genus Oryzias occur commonly in the fresh and brackish waters in coastal lowlands ranging from India across Southeast Asia and on to Japan. Among the three species of Oryzias recorded from peninsular India, two widespread species, O. carnaticus and O. dancena , have previously been reported from Sri Lanka based on museum specimens derived from a few scattered localities. However, members of the genus are widespread in the coastal lowlands of Sri Lanka, a continental island separated from India by the shallow Palk Strait. Although recent molecular phylogenies of Adrianichthyidae represent near‐complete taxon representation, they lack samples from Sri Lanka. Here, based on sampling at 13 locations representative of the entire geographic and climatic regions of the island's coastal lowlands, we investigate for the first time the molecular phylogenetic relationships and phylogeography of Sri Lankan Oryzias based on one nuclear and two mitochondrial markers. Sri Lankan Oryzias comprise two distinct non‐sister lineages within the javanicus species group. One of these is represented by samples exclusively from the northern parts of the island; it is recognized as O. dancena . This lineage is recovered as the sister group to the remaining species in the javanicus group. The second lineage represents a species that is widespread across the island's coastal lowlands. It is recovered as the sister group of O. javanicus and is identified as O . cf. carnaticus . Ancestral‐range estimates suggest two independent colonizations of Indian subcontinent and Sri Lanka by widespread ancestral species of Oryzias during two discrete temporal windows: late Miocene and Plio‐Pleistocene. No phylogeographic structure is apparent in Sri Lankan Oryzias , suggesting that there are no strong barriers to gene flow and dispersal along the coastal floodplains, as is the case also for other generalist freshwater fishes in the island.

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Freshwater and Estuarine Fishes of Great Nicobar Biosphere Reserve

Bineesh

Gopi

Chandra

2022

Faunal Ecology and Conservation of the Great Nicobar Biosphere Reserve

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First record of the Javanese ricefish, Oryzias javanicus (Bleeker, 1854) (Beloniformes: Adrianichthyidae) in the natural waters of India

Cited by 4 publications

References 10 publications

First application of one‐class support vector machine algorithms for detecting abnormal behavior of marine medaka Oryzias javanicus exposed to the harmful alga Karenia mikimotoi

First application of one‐class support vector machine algorithms for detecting abnormal behavior of marine medaka Oryzias javanicus exposed to the harmful alga Karenia mikimotoi

Molecular phylogeny and phylogeography of ricefishes (Teleostei: Adrianichthyidae: Oryzias) in Sri Lanka

Freshwater and Estuarine Fishes of Great Nicobar Biosphere Reserve

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