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A new species of Prodistomum (Digenea, Lepocreadiidae) from Rastrelliger spp. (Scombridae) in the Gulf of Thailand
(2026-01-01)
Gilardoni, Carmen
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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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A New Species of Triaenodes (Trichoptera: Leptoceridae), based on morphological and molecular data, from Kaeng Khoi Waterfall, Chumphon Province, southern Thailand
(2025-02-28)
Laudee, Pongsak
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Malicky, Hans
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Takenaka, Masaki
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Sawangarrom, Phuwadon
;
Suwannarat, Nannaphat
A new species of Triaenodes tipmaneei sp. nov. is described and illustrated based on the male and female genitalia. The mitochondrial DNA (mtDNA) cytochrome c oxidase subunit I (COI) of the new species and of the most similar species T. themis Malicky and Prommi 2006 were analyzed. The male genitalia of Triaenodes tipmaneei sp. nov. is distinguished from other species in the genus by the shape of inferior appendages. Inferior appendages of the new species are without recurved processes; the dorsal branch is divided into a dorsal lobe and two processes, with the upper process curved upward and bifid, and the lower process slender and with pointed apex; the main body of the appendage has a short slender apicolateral process, the mesal process is short and pointed, the ventral process is stout, and the apex is pointed. The genetic distance between T. tipmaneei sp. nov. and T. themis, based on the mtDNA COI region, was 8.5 precent, indicating a large genetic differentiation between the two species.
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Factors Affecting Key Success of Community-Based Tourism Management in Chumphon Province, Thailand
(2025-01-01)
Jansuri, Athip
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Lalaeng, Chanyaphak
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Subongkod, Mallika
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Suwannarat, Nannaphat
The success of community-based tourism management arises from both internal and external motivations of individuals, as well as community participation in every stage from the initial process. Additionally, the community must be prepared in terms of natural resources, culture, human capital, and other resources. The integration of cooperation among government agencies, the private sector, and the community is also essential to support tourism management. This study aimed to: 1) investigate the level of opinions regarding motivation, community participation, and the success of community-based tourism management in Chumphon Province, 2) examine the motivational factors affecting the success of community-based tourism management in Chumphon Province, and 3) study the community participation factors affecting the success of community-based tourism management in Chumphon Province. The sample consisted of 400 individuals involved in community-based tourism management in Chumphon Province. A questionnaire was used as the data collection tool. The statistical methods used for data analysis included frequency, percentage, mean, standard deviation, and hypothesis testing through multiple regression analysis. The results of the study showed that: 1) the overall level of opinions regarding motivation, community participation, and the success of community-based tourism management had a high average level, 2) motivational factors significantly affected the success of community-based tourism management at a 0.05 significance level, and 3) community participation factors significantly affected the success of community-based tourism management at a 0.05 significance level.
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Detection of Ichthyophthirius multifiliis (Ichthyophthiriidae) in two wild amphibian species
(2025-01-01)
Poonlaphdecha, Srisupaph
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Martínez-Silvestre, Albert
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Conde, Norma Collado
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Ricart, Joan Budó
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Suwannarat, Nannaphat
Emerging infectious diseases are one of the main threats to global amphibian populations. Frogs and salamanders are already affected by various pathogens, including ranaviruses, Batrachochytrium dendrobatidis, B. salamandrivorans, and helminths. Here, we report the first confirmed cases of Ichthyophthirius multifiliis, a ciliate parasite traditionally considered fish-specific, infecting wild amphibian larvae in a natural setting. As part of a passive surveillance program in Catalonia, five dead amphibians (four S. salamandra larvae and one Rana temporaria post-metamorph) were collected from a freshwater spring and examined for common pathogens. All individuals tested negative for chytrid fungi and ranaviruses by qPCR. However, histological examination of gill tissue revealed the presence of I. multifiliis trophonts in three of the salamander metamorphs and in the frog post-metamorph. In addition, larvae of forty-two amphibians from other localities in Catalonia tested negative. The observed trophonts matched morphological features previously described in teleost infections, including their characteristic macronucleus and surface ciliation. Our results further validate the previous molecular detections and experimental evidence suggesting the parasite’s potential for cross-taxon infection, raising concerns about the overlooked potential prevalence of I. multifiliis in wild amphibians. Given the increasing impact of climate change and habitat alteration on global freshwater ecosystems, this study highlights the importance of including I. multifiliis in amphibian disease monitoring programs.
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Molecular characterization of three digeneans parasitizing marine fish in the Gulf of Thailand
(2025-01-01)
Suwannarat, Nannaphat
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Gilardoni, Carmen
;
Ribas, Alexis
;
Miquel, Jordi
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Poonlaphdecha, Srisupaph
The Gulf of Thailand is a highly diverse marine ecosystem, yet knowledge of its helminth fauna remains fragmentary. Marine fishes were obtained in 2024 from accidental catches of crab-trap fishers or captured by local fishermen using boats in Chumphon Province, Thailand. In this study, we molecularly characterize three digenean trematode genera parasitizing marine fishes from this area: Lecithocladium (Hemiuridae) from the short mackerel (Rastrelliger brachysoma), with a prevalence of 77% in 22 fishes and ten worms examined for morphology; Prodistomum (Lepocreadiidae) from R.brachysoma, with a prevalence of 18% in 22 fishes, and from Rastrelliger kanagurta, with a prevalence of 100% in one fish, with 10 worms examined for morphology; and Lepocreadioides (Lepocreadiidae) from the double-lined tonguesole (Paraplagusia bilineata), with a prevalence of 75% in four fishes, and eight worms examined for morphology. Sequences of nuclear ribosomal markers (18S, ITS2, and 28S) were generated, providing the first molecular data for Lepocreadioides orientalis. Our analyses confirm the presence of Lecithocladium angustiovum and Prodistomum sp. in the Gulf of Thailand, contribute new molecular data, and provide a morphological description of Prodistomum sp. Despite the Gulf of Thailand’s high ichthyofaunal diversity, its helminth communities remain insufficiently investigated, highlighting the need for future research.
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Helminth absence and invasion success of blackchin tilapia (Sarotherodon melanotheron) in Thailand
(2025-01-01)
Suwannarat, Nannaphat
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Ribas, Alexis
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Miquel, Jordi
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Poonlaphdecha, Srisupaph
Introduction: This study investigates the helminth absence in the invasive blackchin tilapia (Sarotherodon melanotheron) in Thailand, testing the Enemy Release Hypothesis (ERH). The ERH suggests that invasive species thrive in new habitats due to the lack of natural parasites that control their populations in native environments. The recent introduction of S. melanotheron in Thailand has raised concerns about its ecological and economic impacts. Methods: We surveyed 164 blackchin tilapia from six different locations in Chumphon Province, Thailand, including the sea, estuary, canal, and shrimp farms, examining them for helminths. Fishermen provided data on the first capture dates in the surveyed areas to determine how long the populations have been established. Results: No helminths were detected in any of the examined fish. The absence of parasites was consistent across all surveyed environments, suggesting a lack of parasitic burden in the population. Discussion: The absence of helminths may contribute to the successful expansion of S. melanotheron in Thailand, supporting the Enemy Release Hypothesis.
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Three new species of the genera Ceraclea Stephens and Setodes Rambur (Trichoptera: Leptoceridae) from Laos and Cambodia
(2024-06-17)
Laudee, Pongsak
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Malicky, Hans
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Takenaka, Masaki
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Suwannarat, Nannaphat
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Kong, Chamroeun
Three new species of Leptoceridae were described from the Lower Mekong tributaries, namely Ceraclea luangnamthaensis n. sp., Setodes xangthevadaensis n. sp. from Laos, and Setodes mongkondechsawati n. sp. from Cambodia. The male genitalia of Ceraclea luangnamthaensis n. sp. are distinguished from those of other species by its preanal appendages, which are circular in lateral view. The male genitalia of Setodes xangthevadaensis n. sp. are distinguished from those of other species by their segment X, which is separated into a trifurcate apicodorsal process and two long slender apicolateral processes in dorsal view. The male genitalia of Setodes mongkondechsawati n. sp. are distinguished from those of other species by the apicodorsal process of segment X which is circular in dorsal view.

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