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Subject: search.filters.subject.Indian mackerel

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    Item type:Publication,
    A new species of Prodistomum (Digenea, Lepocreadiidae) from Rastrelliger spp. (Scombridae) in the Gulf of Thailand
    (2026-01-01)
    Gilardoni, Carmen
    ;
    Ribas, Alexis
    ;
    Suwannarat, Nannaphat
    ;
    Poonlaphdecha, Srisupaph
    A new species of Prodistomum (Digenea, Lepocreadiidae), Prodistomum chumphonense sp. nov., is described from the intestine of Rastrelliger kanagurta and Rastrelliger brachysoma (Scombridae) collected in the Gulf of Thailand. The new species is characterized by vitelline follicles confined to the hindbody but extending anteriorly to the level of the anterior to posterior margin of the ventral sucker; a ventral sucker consistently larger than the oral sucker; an esophageal region approximately equal in length to the prepharynx; an entire, oval ovary; and a tubular excretory vesicle terminating below the level of the intestinal bifurcation. The new species differs from most congeners, mainly those with vitelline follicles extending into the forebody, by the restriction of the vitellarium to the hindbody. Although morphometrically similar to some specimens in the literature previously identified as P. orientale, previous molecular phylogenetic analyses based on 18S, ITS2, and 28S rDNA sequences demonstrate that P. chumphonense sp. nov. represents a distinct taxon. The present study underscores the importance of integrating detailed morphometric with molecular data for accurate species delimitation in trematodes of the genus Prodistomum.
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    The First Genome Survey and De Novo Assembly of the Short Mackerel (Rastrelliger brachysoma) and Indian Mackerel (Rastrelliger kanagurta)
    (2022-07-01)
    Surachat, Komwit
    ;
    Narkthewan, Patcharaporn
    ;
    Thotsagotphairee, Chayanin
    ;
    Wonglapsuwan, Monwadee
    ;
    Thongpradub, Walaiporn
    Rastrelliger brachysoma (short mackerel) and Rastrelliger kanagurta (Indian mackerel) are commercially important marine species in Southeast Asia. In recent years, numbers of these two species have been decreasing in the wild, and genomic information about them is still limited. We conducted a genome survey of these two mackerel species to acquire essential genomic information using next-generation sequencing data. To obtain this genetic information, comprehensive bioinformatics analyses were performed, including de novo assembly, gene prediction, functional annotation, and phylogenetic analysis. The estimated genome sizes were around 680.14 Mbp (R. brachysoma) and 688.82 Mbp (R. kanagurta). The heterozygosity of these species was very similar (≈0.81), while the repeat content for R. kanagurta (9.30%) was slightly higher than for R. brachysoma (8.30%). Functional annotation indicated that most of the genes predicted in these two species shared very close average amino acid identities (94.06%). The phylogenetic analysis revealed close phylogenetic relationships between these two species and other scombrids. This is the first reported genome survey and assembly of species in the genus Rastrelliger and could be useful for future comparative genomic studies.